2024-03-29T07:33:38Z
https://hrcak.srce.hr/ojs/index.php/rgn/oai
oai:ojs.pkp.sfu.ca:article/3457
2016-12-17T20:54:45Z
rgn:GEO
"160111 2016 eng "
1849-0409
0353-4529
dc
Organic micropollutants in the Sava and Bosna river overbank and floodplain sediments during the May through June 2014 catastrophic flood
Medunić, Gordana
University of Zagreb
Faculty of Science
Department of Geology http://www.pmf.unizg.hr/geol/gordana.medunic
Šmit, Zdenko
Zagreb Public Health Institute
The aim of this study was to determine the presence and nature of organic micropollutants in river overbank and floodplain sediments from the border between Croatia and Bosnia and Herzegovina following the catastrophic 2014 flood. The study involved ten sediment samples from the Sava and Bosna river floodplain. The volatile aromatic compounds, i.e. benzene, toluene, ethylbenzene, and xylene (BTEX), together with alkanes (the linear straight-chain alkanes and the branched alkanes, C10-C28) were determined by GC-MS method. Their estimated amounts were from <0.054 to 3.886 mg/kg, and from 10 to 406 mg/kg, respectively. Hereby, they were below allowed concentration limits for total hydrocarbons in agricultural soil of lighter texture (sandy/loam soil) which is 1000 mg/kg, whilst for heavier clayey soils the limit is 2000 mg/kg. However, their presence in itself in the investigated sediment indicates oil spill problems, whilst their possible sources might be local oil refining industries located in the local cities of Brod and Modriča in Bosnia and Herzegovina.
Faculty of Mining, Geology and Petroleum Engineering
2016-02-09 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3457
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 1 (2016): No. 32
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3460
2016-12-17T20:57:35Z
rgn:GEO
"150930 2015 eng "
1849-0409
0353-4529
dc
PALYNOLOGICAL MODEL OF THE LATE NEOGENE SEDIMENTS OF EASTERN SLAVONIA (CROATIA)
Pecimotika, Gabrijela
INA - Industrija nafte, d.d., Lovinciceva 4, 10002 Zagreb, Hrvatska
Brajković, Dražen
Preradovićeva 29, 10000 Zagreb, Hrvatska
Krizmanić, Krešimir
INA - Industrija nafte, d.d., Lovinciceva 4, 10002 Zagreb, Hrvatska
Rakarić, Damir
INA - Industrija nafte, d.d., Šubićeva 29, 10000 Zagreb, Hrvatska
By applying a palynological analysis of the Late Neogene sediments from one exploration well in the area of Eastern Slavonia, three vegetation zones (Z1, Z2, Z3) as conditioned by climate sensitivity were set. On the basis of mutual percentage relations of the occurrence of individual form-species and grouping them according to the results of cluster analysis, these zones reflect the changes of warm-cold and variable humidity periods. The age of zones has been determined: zone Z1 is Pontian, zone Z2 is Pliocene and zone Z3 is Pleistocene-Holocene. In the Pontian, 13 form-species of spores were determined that do not cross the Miocene/Pliocene boundary. In the Pliocene, 4 index form-species of spores were determined that were not found in the Quaternary in the study area. In the youngest sediments of the study area, i.e. Pleistocene and Holocene, 7 index form-species of spores were determined. Together with well logging (gamma ray and specific resistivity logs) of the formation, a model was constructed for the local routine provision of age in the study area. The results are generally consistent with other results obtained from Early Neogene sediments in adjacent areas in the central part of Paratethys, and may serve as a model for the correlation of contemporaneous sediments in other areas of Croatia, e.g. Sava and Drava Depressions , which in effect may contribute to the more efficient investigation of potential hydrocarbon reservoirs.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3460
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3509
2016-12-17T20:57:59Z
rgn:MPS
"220116 2022 eng "
1849-0409
0353-4529
dc
Light Pollution in the City of Zagreb, December 2010 Through July 2011
Sharma, Indramani
Rudarsko-geološko-naftni fakultet Sveučilišta u Zagrebu, Pierottijeva 6, HR-10000, Zagreb
Mostečak, Ana
Rudarsko-geološko-naftni fakultet Sveučilišta u Zagrebu, Pierottijeva 6, HR-10000, Zagreb
Andreić, Željko
Rudarsko-geološko-naftni fakultet Sveučilišta u Zagrebu, Pierottijeva 6, HR-10000, Zagreb
Light pollution can be defined as an increase in the amount of the light levels in theenvironment caused by the human activity. Although a part of the electromagnetic spectrum just as e.g. microwaves orUV radiation, visible light has been, until recently, treated as completely harmless and without any significant impact onthe environment.From early 1960s onward, both science and society slowly begun to acknowledge the fact that light influences a largenumber of living organisms: plants, animals, and humans alike, in rather unsuspecting ways. It has been noticed as well,that poorly constructed outdoor light fittings allow the light to escape into the environment, outside of the target area.The term "light pollution" has been coined to describe the effect, that influences both ecology and economy of a region.Various methods of measurement can be used in order to assess the magnitude of light pollution effect, e.g. measuringdirect illumination in the vicinity of the sources, remote sensing via satellite imagery, measuring the amount of lightescaping the Earth's surface and measuring the sky brightness as observed from the Earth's surface. The research groupat the Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, chose the third method, makinguse of the Unihedron's Sky Quality Meter (SQM-LE). The goal of this first measurement period was to test theequipment, to obtain the preliminary data and to define the data processing methods. Measurements were collected atnight during eight months. Following conclusions can be drawn from this experiment:1. Measured values vary, strongly depending on atmospheric conditions. Main contribution to this variability comesfrom the water vapour and/or aerosol content in the atmosphere in the absence of clouds, or from the characteristics ofthe cloud layer above the SQM instrument in case of cloudy weather, water vapour being a rather efficient at reflectingand dispersing visible light. (The atmospheric conditions were assesed from the recordings obtained from the CroatianMeteor Network's camera mounted next to the SQM-LE instrument. This camera records the night sky in search of themeteor trails. Since all recorded frames and events are time-stamped, matching these with SQM-LE readings wasstraightforward.)2. Measured values fall into the interval [14 , 18.5] mag/arcsec 23. Values can be expected to converge to:i) 17 mag/arcsec 2 on average during springtime (on clear nights)ii) between 18 and 17 mag/arcsec 2 on average, during winter (on clear nights)iii) between16 and 15 mag/arcsec 2 , on average, during cloudy nights, regardless of season, depending on the height ofthe bottom of the cloud layer and the cloud densityFurther measurements are needed to get more accurate results as well as to extract any patterns or trends from the data.Also, the values obtained by measurements need to be input into models if the magnitude and the extent of lightpollution in Zagreb area is to be monitored.
Faculty of Mining, Geology and Petroleum Engineering
2015-06-03 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3509
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 1 (2015): No. 30
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3510
2016-12-17T20:57:59Z
rgn:GEO
"220116 2022 eng "
1849-0409
0353-4529
dc
Influence of Lithofacies and Diagenetic Processes on the Physical and Mechanical Properties of Carbonate Rocks - Case Study from Sinawin-Sha'wa Area, Libya
Barudžija, Uroš
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, Zagreb
Maričić, Ana
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, Zagreb
Brčić, Vlatko
Croatian Geological Survey, Sachsova 2, Zagreb
Geological investigations were carried out in the Sinawin-Sha'wa area, in northwestern Libya, in order to find suitable rocks for aggregate in asphalt mixtures for Nalut - Ghadamis Road reconstruction. By combined field work and micropetrographical analysis four different carbonate lithofacies were determined within Upper Cretaceous sedimentary sequence: lithofacies A - micritic limestones; lithofacies B - dolomitic marls; lithofacies C - dolobiomicrites; lithofacies D -biosparites and biosparudites. Diagenetic processes of cementation, recrystallization, dolomitization and silicification were identified within these lithofacies. Stone samples, taken from three lithofacies A, C, and D, were analyzed in order to determine its physical and mechanical properties (apparent density, open porosity, water absorption, uniaxial compressive strength). In addition, aggregate produced by crushing of the rock from lithofacies D is tested on resistance to crushing and abrasion (LA test). Samples from lithofacies B were not included in the testing of physical and mechanical properties since
it is estimated as not suitable rock material for crushed aggregate. Samples from lithofacies A, C and D showed significant differences in the physical and mechanical properties. These differences stem from differences in mineralogical and petrographical composition as well as from diagenetic processes. Stone of lithofacies D were estimated as the most appropriate rocks available in the area, for aggregate in asphalt mixtures.
Faculty of Mining, Geology and Petroleum Engineering
2015-06-03 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3510
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 1 (2015): No. 30
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3511
2016-12-17T20:57:59Z
rgn:GEO
"220116 2022 eng "
1849-0409
0353-4529
dc
Overview and Reinstatement of Some Geophysical Interpretations in the Eastern Sava Depression
Ružić, Tihana
INA - Industrija nafte, d.d., Sektor za geologiju i inţenjering, Šubićeva 29, 10000 Zagreb
The eastern part of Sava Depression is bounded on the south with the Sava River and on the north with Psunj Mountain,Požeška and Dilj Hills. In this part thicker Neogene-Quaternary sediments than in the western part were found, and thereis almost never reached thermal maturity sufficient to catagenesis. Therefore, after the first seismic survey and exploratorydrilling, a new additional research never continued. The overview and assessment of the reconstruction of the part ofgeophysical measurements was prepared in the eastern part of the Sava Depression. In some previous interpretations rocksbetween the Upper Pannonian and Upper Pontian are described as result of deltaic systems, with the clinoforms. Regionaldeposition at the time of the Early Pannonian indicates the beginning of significant changes in the environment in Croatianpart of the Pannonian Basin System (CPBS), with a distinct domination of turbidites. Clinoforms are possible results ofespecially psammitic detritus deposited toward the margins of the depression, and partly in the direction materialtransport. In the Early Pontian regionally depositional environments started to be local. In the Quaternary can be expectedthe existence of the delta or alluvial fans.
Faculty of Mining, Geology and Petroleum Engineering
2015-06-03 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3511
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 1 (2015): No. 30
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3512
2016-12-17T20:57:59Z
rgn:MIN
"220116 2022 eng "
1849-0409
0353-4529
dc
Analysis of constructional and operational parameters of chain saw
Korman, Tomislav
Rudarsko-geološko-naftni fakultet, Sveučilište u Zagrebu, Pierottijeva 6, HR-10000 Zagreb, Hrvatska
Kujundžić, Trpimir
Rudarsko-geološko-naftni fakultet, Sveučilište u Zagrebu, Pierottijeva 6, HR-10000 Zagreb, Hrvatska
Klanfar, Mario
Rudarsko-geološko-naftni fakultet, Sveučilište u Zagrebu, Pierottijeva 6, HR-10000 Zagreb, Hrvatska
Chain saw machines are used for cutting vertical or horizontal cuts in underground and surface exploitationof dimension stone. Chainsaw performance in quarrying dimension stone depends on the right choice of machine’soperational parameters, cutting elements as well as the conditions and methods of quarrying in the certain type of rock.The key operational parameters which the operator must arrange on a chain saw are chain speed and cart speedmovement, while the values of this parameters are based on manufacturer's recommendations and/or the operatorexperience. The main objective of this paper is to analyze the relationship between the operational parameters, chaindesign and chainsaw performance. Based on previous research, despite the limited literature on chain saw performance,it can be concluded that chain saws do not operate with optimum operational parameters, and current chain designs arenot efficient enough. Influence of the cutting chain design on the chainsaw performance can be analyzed by laboratorytests using a linear cutting machine. Although previous researches provide specific guidelines to increase chainsawperformance, further research should be directed to determine the optimal arrangement and the number of tools in thecutting segment as well as to the influence of the cutting geometry on the force and cutting energy.It is also reported that insufficient efficiency of chainsaw machines is due the shallow depth of cuts taken by the cuttingtools. Chain saw performance can be increased with the increase of the depth of cutting tools or with the decrease ofchain speed respectively. Optimal chain speed cannot be determined solely on the basis of the specific energy since theoptimal speed also depends on the cutting force and the wear of cutting tools as well as on the amount of materialcreated during the cutting. Additional laboratory and field experiments should analyse the influence of the abovequantities on chain saw performance in order to determine optimum constructional and operational parameters.
Faculty of Mining, Geology and Petroleum Engineering
2015-06-03 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3512
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 1 (2015): No. 30
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3513
2016-12-17T20:57:59Z
rgn:GEO
1849-0409
0353-4529
dc
Sjećanje na Jožefa Šimona
Vrbanac, Boris
Retired (former INA Plc.)
In memoriam.
Faculty of Mining, Geology and Petroleum Engineering
2015-06-03 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3513
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 1 (2015): No. 30
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/3514
2016-12-17T20:57:59Z
rgn:MIN
"220116 2022 eng "
1849-0409
0353-4529
dc
Air Quality and Microclimatic Parameters During Excavation of Mala Kapela Tunnel
Klanfar, Mario
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, Zagreb
Vrkljan, Darko
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, Zagreb
Lončarić, Miroslav
Stjepana Radica Street 65, 48305 Reka
During excavation of the Mala Kapela tunnel, measurements of harmful gases concentration, ventilation parameters and microclimatic parameters were performed. Measurements were done in 17 occasions during period of 16 months, along the advance of the tunnel excavation. Consequently, large amount of data was obtained, in different tunnel chainages, ventilation ducts length, and in different work operations during the excavation.
Main sources of harmful gases during tunnel excavation are explosives and diesel equipment. The concentration of the same mainly depends on explosive charge and overall diesel equipment power, present at the excavation face of the tunnel. Continuous measurements of the concentration of carbon monoxide (CO) and dioxide (CO2), and nitrogen oxide (NO) and dioxide (NO2) was performed during drilling, blasting, and loading and haulage operations. Measurements were done in 45 cases in total. Recorded data was analysed, where peak concentrations were joined to corresponding operation and the tunnel chainage. Regulations on threshold limit values were used to determine if concentrations rise above the permissible ones. In case they do, the time required for dilution of gases below permissible concentration was noted. Typically, concentrations of all measured gases rise rapidly after blasting. Afterwards, ventilation system acts to dilute them and maintain them relatively constant until the end of loading and haulage. According to measurements in this research, highest concentrations and longest time of dilution were found after blasting. At the same time, concentration of all measured gases exceeds permissible values. Carbon monoxide is found to exceed permissible values during all work operations. It shows most frequent transgression above the limit (in 33 to 100% of cases) and highest time of dilution (up to 40 min).
Air supply to the excavation face was measured in 25 cases. It was correlated to the length of ventilation ducts, as the tunnel excavation advances. Results show the trend of air flow drop of 0,3 to 1,2 m3/s per 100m of duct length, with average value of 0,7 m3/s. In accordance with air flow drop, higher peak concentrations and longer time of dilution was observed for drilling and blasting operations. Conversely, lower concentrations and shorter time of dilution were found for loading and haulage operation. This could be attributed to longer truck cycle as excavation advances, thus less diesel units are present in proximity of the excavation face.
Measured data on microclimatic parameters was correlated to season changes, distance form tunnel entrance and mutually. Air temperature was measured in 8 cases, along the tunnel and outside in the proximity of the entrance. Recorded data shows that temperature is constant along the tunnel. That is, there is no change with depth of the tunnel below surface, which is up to 433m. It was found that temperature mainly depends upon season and upon outer air that is supplied by ventilation to the tunnel. Highest temperature was recorded during summer (20 to 27 °C), when inner and other temperature are in approximate equilibrium. Lowest inner temperature was recorded during winter (12 to 17 °C), when difference from outer temperature rises.
Relative humidity was measured in 14 cases. Recorded data shows random character, so no relations were derived, except that inner air is more humid on average and it's humidity varies much less compared to the outer air. Outer humidity ranges between 36 and 99%. Inner humidity ranges between 53,6 and 99,3 %, and it was 11,8% higher on average. Air pressure was measured in 15 cases. It was found that it corresponds to the outer atmospheric pressure. There is normal pressure drop with distance from tunnel entrance, as vertical alignment of the tunnel changes it's altitude.
Faculty of Mining, Geology and Petroleum Engineering
2015-06-03 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3514
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 1 (2015): No. 30
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3515
2016-12-17T20:57:59Z
rgn:PEE
"220116 2022 eng "
1849-0409
0353-4529
dc
Remediation of the Old Ecological Load in the Protected Area of the Morava River – Re-abandonment of the Oil and Gas Production Wells
Bujok, Petr
Faculty of Mining and Geology, VSB – Technical University of Ostrava; 17. listopadu 15, 708 00 Ostrava Poruba
Klempa, Martin
Faculty of Mining and Geology, VSB – Technical University of Ostrava; 17. listopadu 15, 708 00 Ostrava Poruba
Slivka, Vladimír
Faculty of Mining and Geology, VSB – Technical University of Ostrava; 17. listopadu 15, 708 00 Ostrava Poruba
Porzer, Michal
Faculty of Mining and Geology, VSB – Technical University of Ostrava; 17. listopadu 15, 708 00 Ostrava Poruba
Němec, Igor
Palivový kombinát Ústí, s.p.; Hrbovická 2, 403 39 Chlumec
Šťastná, Věra
Palivový kombinát Ústí, s.p.; Hrbovická 2, 403 39 Chlumec
Smejkalová, Eva
Faculty of Mining and Geology, VSB – Technical University of Ostrava; 17. listopadu 15, 708 00 Ostrava Poruba
Zdvořák, Jaroslav
Faculty of Civil Engineering, VSB – Technical University of Ostrava; 17. listopadu 15, 708 00 Ostrava Poruba
The presence of the former oil and gas producing wells that are or can be improperly abandoned creates a possible environmental hazard in terms of contamination of the groundwater and soil in the present. In the area of the Czech Republic, specifically in South Moravia part, which has a long oil and gas production history, plenty of such wells can be found. Finding out the information about their abandonment in archives is often very demanding (sometimes even impossible). During various survey works and re-abandonment attempts it was found out that many wells are originally abandoned improperly, insufficiently or not at all. The occurrence of such wells is not just potential but also very actual hazard for the cultural landscape of the South Moravia, especially for aquifers, agriculture and natural protected areas of national significance. This paper is focused on the possibility of the definitive abandonment of this particular ecological load. The proposed method was verified in laboratory conditions and in the field. It is now a standard form of the re abandonment of oil and gas wells without precise localization in the South Moravian oil fields.
Faculty of Mining, Geology and Petroleum Engineering
2015-06-03 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3515
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 1 (2015): No. 30
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3531
2016-12-17T20:57:35Z
rgn:GEO
"150925 2015 eng "
1849-0409
0353-4529
dc
NEW LITHOSTRATIGRAPHIC UNITS IN THE CROATIAN OFFSHORE AND THEIR DEFINITION IN THE «R» PROGRAMMING LANGUAGE
Šapina, Marijan
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Zagreb
Vekić, Marko
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Zagreb
New lithostratigraphic units in the Croatian offshore have been recently proposed, and are now used, especially in the Pleistocene and Holocene sediments. Two new formations in the Croatian part of Northern Adriatic have been previously named (Istra and Ivana), as well as recently three new lithostratigraphic members inside the Ivana Formation. In addition, name change of the Susak Formation has been proposed. Furthermore, in the Southern Dalmatia shallow offshore (i.e., palaeosediments of the Neretva River), the new Neretva Channel Formation has been recently named. It is divided into the Neretva Sands and the Mali Ston Bay Member. Due to the often descriptive task of the definition of the lithostratigraphic units, here the simplification of the task is made possible by the algorithm and the source code which are based on a sufficient number of measured porosity values in a vertical of a lithological unit or a depositional sequence. The algorithm directly defines the way of testing the hypothesis of the normal distribution of porosity values, and the code does it numerically and graphically. The normality test is performed with the Shapiro-Wilk test. Depending on the results of the hypothesis test (normal distribution of the measured values), it is simply evaluated if it is a homogeneous, permeable or non-permeable, or a heterogeneous lithostratigraphic unit, that always can be distinguished from top and base. Based on the result, and familiarity with the geographical location of the sample, the unit is easily named following the rules of lithostratigraphic nomenclature.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3531
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3586
2016-12-17T20:57:35Z
rgn:GEO
"151006 2015 eng "
1849-0409
0353-4529
dc
STRUCTURAL AND STRATIGRAPHICAL RELATIONSHIP IN THE ESTERN PART OF THE DRAVA DEPRESSION - WIDER AREA OF THE FIELD BENIČANCI
Drmić, Martina
Slavinić, Petra
This article closely defines the stratigraphic and structural relations within the eastern part of the Drava depression. These relations are explained in detail for the more important fields located in the area of exploration such as Beničanci, Klokočevci, Števkovica and others. A geological column has been synthesized for the Beničanci area together with correlation profiles to better display the lithology of the Lower and Middle Miocene. Furthermore, structural maps of key bed H and EL-markersG, Z',Rρ, α have been developed and interpreted and the stratigraphic-structural relations of the investigation area have been laid down.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3586
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3591
2016-12-17T20:57:35Z
rgn:MIN
"150918 2015 eng "
1849-0409
0353-4529
dc
COST ANALYSIS IN CONSTRUCTION OF UNDERGROUND MINING STRUCTURES AND OPPORTUNITIES FOR THEIR REDUCTION
Doneva, Nikolinka Jordan
Goce Delcev University, Faculty of natural and technical science, Stip
Despodov, Zoran
Goce Delcev University, Faculty of natural and technical science, Stip
Mirakovski, Dejan
Goce Delcev University, Faculty of natural and technical science, Stip
Hadzi-Nikolova, Marija
Goce Delcev University, Faculty of natural and technical science, Stip
Mijalkovski, Stojanče
Goce Delcev University, Faculty of natural and technical science, Stip
The construction of underground mining facilities is of essential importance to the exploitation of mineral resources. Confirmation of this is the fact that the construction costs of main facilities occupy 40-60% of the underlying investments in the main constraction and equipping. The main underground mining facilities are: shafts, drifts, raise, pump chambers, warehouses etc. This paper presents detailed analysis of underground mining facility - drift constraction costs per individual working operations, following their change which depends on the rock type and profile size of underground mining facility, as well as possibilities of reducing these costs.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3591
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3602
2016-12-17T20:57:35Z
rgn:PEE
"150925 2015 eng "
1849-0409
0353-4529
dc
THE BASICS OF MODEL FOR MARGINAL TESTING OF COSTS FOR DISPOSAL OF EXTRACTED FORMATION WATER
Ivšinović, Josip
INA d.d., Zagreb
Dekanić, Igor
Rudarsko-geološko-naftni fakultet, Sveučilište u Zagrebu
Formation water is extracted throughout the life of the fields ofhydrocarbons together with oil and/or gas. Oil dehydration costs, as well asthose of production water reinjection represent significant component in totalcosts at mature oil and gas fields. The optimization of the aforesaid costs,from the point of technology and economics, can affect both profitability(cost-effectiveness) and development of the oil field in the future.Methodology of calculation of unit cost will be elaborated in this paper fortreatment of produced water (dehydration) and production water reinjection. Themethodology of calculation of unit cost for disposal of produced water will beapplied at production of mature oil and gas field. Unit cost for disposal ofproduced water for the period 2009 – 2014 will be calculated in the selectedexample. Making of this particular model of calculation of disposal costs ofproduced water is crucial for economy analyses of hydrocarbons exploitationfrom mature fields.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3602
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3625
2016-12-17T20:54:45Z
rgn:GEO
"151220 2015 eng "
1849-0409
0353-4529
dc
Preliminary estimate of CO2 storage capacity by petrophysical modelling in Upper Miocene Poljana Sandstones in the western part of the Sava Depression
Podbojec, Marija
Cvetković, Marko
A preliminary assessment of the capacity of regional geological storage in the western part of the Sava Depression was based on data obtained from several deep exploration wells. The Poljana Sandstones represent a regional deep sandstone body, in most parts saturated with water, with promising underground facilities for the storage of CO₂ in the study area. Poljana Sandstones (member of Kloštar-Ivanić Formation bounded between E-log markers Rνand Z') have favourable petrophysical properties and are situated at reasonable depths. According to previous investigations, at depths greater than 800 meters supercritical conditions of temperature and pressure CO₂ are achieved, which ensures easy and safe injection into storage underground facilities. For the creation of a model in Petrel software, various data was used, including the distribution of CO₂ density, porosity, effective thickness and the relative depth of sandstone. Spatial distribution of porosity was made regarding neutron porosity logs. The most important parameter in the estimate of storage capacity is effective thickness, defined by the interval between E–log markers Rν and Z’. Hence, the effective thickness was used for top and bottom surface of sandstones. Density of CO₂ was created according to their spatial distribution regarding the depth and the temperature. The capacity of CO2 storage was calculated by the volumetric method. The use of a calculated Petrel model can subsequently determine the amount of CO₂ storage in the underground facilities of the study area.
Faculty of Mining, Geology and Petroleum Engineering
2016-02-09 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3625
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 1 (2016): No. 32
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3626
2016-12-17T20:57:35Z
rgn:GEO
"151006 2015 eng "
1849-0409
0353-4529
dc
SUBSURFACE MODELING AND UNCERTAINTY MODELS OF THE NEOGENE-QUATERNARY SEDIMENTS IN THE PART OF SAVA DEPRESSION BASED ON DIGITALIZATION OF LEGACY MAP DATA
Baketarić, Tomislav
Cvetković, Marko
Aim of the research was the accurate digitalization and subsurface modelling of the legacy data, namely paper-based geological maps. The research area covers approximately 1053 km2 and is located in Croatian part of Pannonian Basin System, Sava Depression, i.e. in the surrounding of Stružec Oil Field. Data input for the structural analysis were structural maps which were previously made in the 1980. Set included five structural maps based on regional E-log markers and one map of pre-Neogene surface. All were digitalized in program ArcGIS, and later modelled in Petrel. Structural contours and total of 134 faults were exported into Petrel software where they were further processed and regrouped. From such digitalized and processed data the geological model (geomodel) was made using complex fault framework. The study concerned the advantages and errors that occur during creation of such geomodel. It clearly displays relations between major and minor faults and fault slips, geological structures and structural traps in 3D (e.g. anticline of the Stružec Field). Another advantage is multicolored presentation of depths and faults, which enables easier recognition of geological structures and potential traps for hydrocarbons. Errors and issues can occur during digitalization of contour lines, selection of the appropriate algorithm and those ones that arise when model is created. Low error between two approaches indicates accuracy of digitalization of data and subsurface modelling. Uncertainty models (maps of statistical percentage deviation) were made in the Petrel Software for the display of the deviation between handmade maps and Petrel models for each E-log marker and one pre-Neogene top.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3626
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3649
2016-12-17T20:57:35Z
rgn:MIN
"151019 2015 eng "
1849-0409
0353-4529
dc
CURRENT COGNITION OF ROCK TENSILE STRENGTH TESTING BY BRAZILIAN TEST
Briševac, Zlatko
Kujundžić, Trpimir
Čajić, Sandi
Tensile strength in rock mechanics is a characteristic more frequently determined in the indirect rather than direct way. This paper presents a historical review of the development of the indirect method called the Brazilian test, comprising the period from 1943 to the present day. It stresses some aspects which are essential for interpreting the results of the Brazilian test due to the different degrees of stress during the testing and the direct method of determining tensile strength. The estimate of the direct tensile strength and the influence of sample saturation on the results of indirect tensile strength testing have been specifically elaborated.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3649
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c) 2015 authors and journal
oai:ojs.pkp.sfu.ca:article/3651
2016-12-17T20:57:35Z
rgn:OTH
"150918 2015 eng "
1849-0409
0353-4529
dc
Book review "Statistics in geology"
Ilišević, Dijana
Department of Mathematics,
Faculty of Science,
University of Zagreb
Ovo je prikaz knjige "Statistika u geologiji" autora Tomislava Malvića i Gordane Medunić
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3651
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/3654
2016-12-17T20:57:35Z
rgn:OTH
1849-0409
0353-4529
dc
Book review "Geology and exploration of hydrocarbon reservoirs"
Barudžija, Uroš
Prikaz knjige Geologija i istraživanje ležišta ugljikovodika napisan dvojezično.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3654
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/3660
2016-12-17T20:54:45Z
rgn:GEO
"151220 2015 eng "
1849-0409
0353-4529
dc
Reefs and bioaccumulations in the Miocene deposits of the North Croatian Basin – Amazing diversity yet to be described
Sremac, Jasenka
University of Zagreb, Faculty of Science, Department of Geology http://geol.pmf.hr/~jsremac/
Bošnjak Makovec, Marija
Croatian Natural History Museum
Vrsaljko, Davor
Croatian Natural History Museum
Karaica, Bojan
Tripalo, Kristina
Fio Firi, Karmen
University of Zagreb, Faculty of Science, Department of Geology
Majstorović Bušić, Ana
INA-Industry of Oil Plc.
Marjanac, Tihomir
University of Zagreb, Faculty of Science, Department of Geology
During the early stages of the Middle Miocene transgression marine biota invaded the newly formed Paratethys Sea. Reefs and reef-like structures particularly flourished with life, supported by the favourable climate conditions. Miocene biogene buildups show a variety of fossil assemblages and lithologic features. The main reef-builders were bryozoans, coralline algae, corals, oysters, vermetids, sponges and serpulids. Water turbidity and depth were major ecological factors controlling the reef biota. Lithofacies types at the studied localities in Northern Croatia show significant similarity with the Upper Langhian (Middle Badenian) of the Leitha Mountains in Austria, but can also be well compared with Miocene to recent reef structures in the Mediterranean. The Miocene reef-like buildups exhibit different porosity rates and other lithological characteristics.
Faculty of Mining, Geology and Petroleum Engineering
2016-02-09 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3660
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 1 (2016): No. 32
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3667
2016-12-17T20:57:35Z
rgn:OTH
"151001 2015 eng "
1849-0409
0353-4529
dc
The Legend of Saint Kinga – Patroness of Krakow Miners
Bedeković, Gordan
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
The article describes the legend of Saint Kinga.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3667
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/3674
2016-12-17T20:54:45Z
rgn:GEO
"151212 2015 eng "
1849-0409
0353-4529
dc
The influence of geology on the course and outcome of the Third Battle of Ypres (Flanders, WW1)
Zečević, Marko
Dr Franjo Tudjman Croatian Defence Academy
Geological structure of the terrain as a ground for a battlefield could be a significant factor for the success or failure of a military operation. The geology of the Belgian town of Ypres was an important, maybe even crucial factor, of the failure of the WWI Allied Powers offensive military operations against German Axis forces in 1917. The Early Eocene clays found at the ground surface at Ypres, coupled with excess precipitation, turned out to be utterly inappropriate for the fortification, movement, fighting and manoeuvring of all military units, especially the armoured units that were directed towards hardly passable routes. With selecting the unsuitable and hardly passable terrain, that is the direction of the attack, the British army had losses of the available combat potential and armoured forces were ineffective during the battle. The total number of Allied casualties was 448,000 dead, wounded, imprisoned and missing. This paper offers other possible solutions that would, from a military geographic and military geological viewpoint, have made a better solution for achieving the strategic goal required by the Allies on the eve of the Third Battle of Ypres in 1917.
Faculty of Mining, Geology and Petroleum Engineering
2016-02-09 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3674
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 1 (2016): No. 32
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3679
2016-12-17T20:57:35Z
rgn:OTH
"151022 2015 eng "
1849-0409
0353-4529
dc
Book review "Hydrology"
Pavlić, Krešimir
Hydrology, seismology http://rgn.hr/~kpavlic/
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3679
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/3685
2016-12-17T20:57:35Z
rgn:OTH
"151022 2015 eng "
1849-0409
0353-4529
dc
Book review "Handbook of Research on Advancements in Environmental Engineering"
Pašić, Borivoje
Rudarsko-geološko-naftni fakultet, Sveučilište u Zagrebu
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3685
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/3688
2016-12-17T20:57:35Z
rgn:OTH
"151021 2015 eng "
1849-0409
0353-4529
dc
Croatian SPE Student Chapter Activities Review
Bošnjak, Ivan
Jukić, Mario
Pelivan, Klara
Brief review of Chapter's activities throughout Academic Year is given in this Article. By introducing new ways of activities this Academic Year, number of members has greatly incresed which will help to develop Chapter in different areas. Organizing of Annual Student Energy Conference is still the main focus of Chapter's activities.
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3688
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/3727
2016-12-17T20:54:18Z
rgn:GEO
"160212 2016 eng "
1849-0409
0353-4529
dc
Soil, bark and leaf trace metal loads related to the war legacy (The Prašnik rainforest, Croatia)
Mesić Kiš, Ivana
* ES kralja Tomislava, Ulica Matice hrvatske 1, 31 500 Našice
** PhD Student, University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 95, Zagreb, 10 000, Croatia
Karaica, Bojan
Hyla – Croatian Herpetological Society, Lipovac I 7, Zagreb, 10 000, Croatia
Medunić, Gordana
University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 95, Zagreb, 10 000, Croatia
Romić, Marija
3University of Zagreb, Faculty of Agriculture, Svetošimunska 25, Zagreb, 10 000, Croatia
Šabarić, Jasenka
School of Medicine University of Zagreb, Andrija Štampar School of public health, Rockfellerova 4, Zagreb, 10 000, Croatia
Balen, Dražen
University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 95, Zagreb, 10 000, Croatia
Šoštarko, Kristijan
University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 95, Zagreb, 10 000, Croatia
As a special forest vegetation reserve, the Prašnik rain forest is a highly protected area which owes its protection not only to a unique composition of trees, but also to its geographical position and, to an extent, historical events. It is situated on the Sava River left bank, north of the city of Stara Gradiška (cca. 3 km). The study area belongs to the southwestern part of Pannonian Basin, specifically the Sava Depression. The aim of this study was to assess a possible impact of war activities in Croatia (23 years ago) when numerous mines were laid in this region and to establish a major and trace metal baseline concentrations for future investigations. Ten topsoil (S) samples were taken randomly with adjacent vegetation (bark and leaves) at each site. Major and trace metal concentrations were measured for all three types of samples using the ICP method. Analysed soils are composed of quartz, micaceous mineral, 14Å mineral, plagioclase and mixed layer minerals. All metal values in the sample taken from an ex-mine crater are 2-4 times higher compared to other. Generally, positive statistically significant Kendall’s Tau correlation coefficients of trace metals (Cd, Cr, Cu, Ni, and Zn) were found for all combinations of the S (soil), B (bark), and L (leaf) groups. Such results indicate that the war activity have played a certain role in a distribution pattern of soil as well as vegetative trace metal levels.
Faculty of Mining, Geology and Petroleum Engineering
2016-04-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3727
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 2 (2016): No. 33
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3730
2016-12-17T20:57:35Z
rgn:OTH
1849-0409
0353-4529
dc
IMPRESSUM, CONTENT AND ADVERTISEMENT
Malvić, Tomislav
Faculty of Mining, Geology and Petroleum Engineering
2015-11-12 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3730
Rudarsko-geološko-naftni zbornik; Vol. 30 No. 2 (2015): No. 31
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/3764
2016-12-17T20:54:45Z
rgn:MPS
"160112 2016 eng "
1849-0409
0353-4529
dc
Asteroids
Andreic, Željko
RGNF
Asteroids are the largest minor bodies in the Solar System. Nowadays they are in the research focus due to several facts about them: first, a subclass of asteroids can collide with Earth, and consequences of such a collision are dramatic. Second, they are now seen as source of materials that are becoming scarce on Earth, and they will be needed in future space constructions anyway. Third, they are holding clues about the origin and evolution of the Solar System. In this article, a short overview of current knowledge about asteroids is presented. Last, but not least, as several Croatian scientists were recently honored by naming an asteroid after them, a short overview of the naming process is given.
Faculty of Mining, Geology and Petroleum Engineering
2016-02-09 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3764
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 1 (2016): No. 32
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3836
2016-12-17T20:54:18Z
rgn:GEO
"160218 2016 eng "
1849-0409
0353-4529
dc
Middle Triassic autoclastic deposits from southwestern Bosnia and Herzegovina
Smirčić, Duje
Lugović, Boško
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6. HR-10 000 Zagreb
Aljinović, Dunja
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6. HR-10 000 Zagreb
Hrvatović, Hazim
Federalni zavod za geologiju, Ilidža, Ustanička 11, 71 210 Sarajevo, BiH
Kolar-Jurkovšek, Tea
Geological Institut of Slovenia, Dimičeva 14, Sl -1000 Ljubljana
Jurkovšek, Bogdan
Geological Institut of Slovenia, Dimičeva 14, Sl -1000 Ljubljana
Gajšak, Filip
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6. HR-10 000 Zagreb
Middle Triassic volcanic and volcaniclastic rocks have been recognized at several localities near Bosansko Grahovo, in southwestern part of Bosnia and Herzegovina in the External Dinarides. Peculiar types of autoclastic rocks were investigated. These are peperites and hyaloclastites. Regarding specific structures, mineral composition and micropetrographic characteristics it was possible to further differentiate hyaloclastites into in situ hyaloclastites and slightly resedimented hyaloclastites that represent genetic succession. All rock types occurred in a deep sea troughs that formed as a consequence of Middle Triassic extensional tectonic and rift related wrench faulting. In situ hyaloclastites and slightly resedimented hyaloclastites were formed due to quenching at the contact of lava effusions with sea water. Genesis of peperites is related to lava emplacement in unconsolidated water saturated lime mudstones that were deposited in deep sea basin. All investigated rock types represent first findings of autoclastic deposits in the External Dinarides. Biostratigraphic constraints achieved by means of conodont species Neogondolella excentrica, Paragondolella excelsa, Paragondolella trammeri and Gladigondolella tethydis indicate Late Anisian to Early Ladinian interval of the autoclastic deposits from Bosansko Grahovo.
Faculty of Mining, Geology and Petroleum Engineering
2016-04-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3836
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 2 (2016): No. 33
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3842
2016-12-17T20:54:18Z
rgn:MIN
"160214 2016 eng "
1849-0409
0353-4529
dc
Models to estimate Brazilian indirect tensile strength of limestone in saturated state
Briševac, Zlatko
Kujundžić, Trpimir
There are a number of methods for estimating physical and mechanical characteristics. Principally, the most widely used method is regression, but recently,more sophisticated methods such as neural networks have frequently been applied as well. This paper presents the models of a simple and a multiple regression and neural networks –types Radial Basis Functionand Multiple Layer Perceptron, which can be used for the estimate of the Brazilian indirect tensile strength in saturated conditions. The paper includes the issues of collecting data for the analysis and modelling and an overview of the performed analysis with an efficacy assessment of the estimate foreach model. After the assessment, the model which provided the best estimate was selected, including the model which could have the most wide-spread application in the engineering practice.
Faculty of Mining, Geology and Petroleum Engineering
2016-04-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3842
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 2 (2016): No. 33
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3847
2016-12-17T20:54:45Z
rgn:GEO
"160115 2016 eng "
1849-0409
0353-4529
dc
Composition and provenance of Gröden sandstone from the Velebit Mts.
Sudar, Vedran
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb
Aljinović, Dunja
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb
Smirčić, Duje
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb
Barudžija, Uroš
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb
Six samples of Gröden sandstones (Middle Permian) were analysed: Five of them were from Pikovac Creek valley (in the vicinity of Brušane village at Velebit Mts., Croatia) and one was from the locus typicus Gröden/Val Gardena (Italy). Based on the micropetrographical characteristics of sandstones, as well as on the modal composition and heavy mineral association, origin of material, weathering index of source rocks, climate and relief in the period of deposition have been supposed. Four samples from Pikovac Creek were petrographicaly determined as lithic greywackes, one as densely packed lithic arenite, while a specimen from Gröden locus typicus represents feldspar greywacke. Lithic greywackes/arenites imply very low maturity and suggest a close proximity of source rocks as well as the active tectonics in the hinterland of the depositional basin. Heavy mineral association in the samples from Pikovac Creek valley, with a large amount of fairly rounded stable grains (zircon, tourmaline and rutile), indicate that clastic material was derived from recycled orogen, and probably from reworked sedimentary rocks. The presence of kyanite and chlorite in the heavy mineral assemblage suggest their origin is from metamorphic rocks. This data assumes that Gröden sandstones from Pikovac Creek were possibly deposited in the fan delta or braided delta depositional environment as a part of a rift system (recycled orogen). The composition of the sample Gröden s. locus typicus (light and heavy mineral fractions) suggests the vicinity of magmatic rocks in the source area. All analysed samples are red coloured and have a large amount of limonitized grains in the heavy mineral assemblage, that point to the arid climate at the time of deposition. A weathering index diagram for Pikovac sandstones implies an arid/semiarid climate and high relief of the source area where metamorphic or sedimentary rocks dominate, while an arid/semiarid climate and high relief with plutonic source rocks were supposed for the provenance of Gröden s. locus typicus.
Faculty of Mining, Geology and Petroleum Engineering
2016-02-09 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3847
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 1 (2016): No. 32
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3848
2016-12-17T20:53:22Z
rgn:MIN
"160915 2016 eng "
1849-0409
0353-4529
dc
An Approach to the Evaluation and Classification of Dimensional Stone Quarries with an Emphasis on Safety Parameters
Yari, Mojtaba
Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran
Bagherpour, Raheb
Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran
Almasi, Najmeddin
Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran
Building, dimensional and decorative stones from mining and industry are among the significant resources of Iran. Following China and Italy, Iran is in third place of world production, but only has a minor contribution in international trade. One main reason of this problem is negligence regarding the introduction of dependable mines to foreign customers. On the other hand, the frequency of fatal and non-fatal accidents in these mines implies the necessity of more attention to safety parameters. The first stage to attain this aim is identifying the major factors on safety of these mines and ranking the major mines considering these indices. In this paper, a comprehensive model for ranking of mines in the sense of all imposing attributes with an emphasis on safety parameters is presented. In order to validate the model, 19 active mines of the Pyrtak Company in Lorestan province have been used. In this paper, after determining all the parameters of safety in decorative stone mines and weighting these attributes, using AHP-TOPSIS and fuzzy environment, mines have been ranked. After a systematic evaluation of the decorative stone mines, the most appropriate mine is selected.
Faculty of Mining, Geology and Petroleum Engineering
2016-09-15 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3848
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 3 (2016): No. 34
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/3857
2016-12-17T20:54:18Z
rgn:GEO
"160219 2016 eng "
1849-0409
0353-4529
dc
Health impact assessment by ingestion of polluted soil/sediment
Tomašek, Ines
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
Mileusnić, Marta
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
Leboš Pavunc, Andreja
University of Zagreb, Faculty of Food Technology and Biotechnology
Potentially toxic elements (PTEs) pose a threat to human health as they can easily enter human body via ingestion of polluted soil/sediment. In order to estimate bioavailability and access health impact on people, measurement of the oral bioaccessibility of a contaminant is crucial. Various laboratory based in vitro tests which mimic human gastrointestinal tract conditions can be used. In order to set up the method for analysing bioaccessibility of contaminants in soil samples in Laboratory for the analysis of geological materials at Department of Mineralogy, Petrology and Mineral resources (Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb - RGNF), with regards to the available equipment, an orientation survey was carried out in collaboration with the Department of Biochemical Engineering (Faculty of Food Technology and Biotechnology, University of Zagreb - PBF). The digestion of two different samples in synthetic fluids (gastric and intestinal fluid) was performed simultaneously at RGNF laboratory and PBF laboratory under different extraction conditions according to each laboratory’s ability. Prior to analysis of bioaccessibility, detailed mineralogical and chemical characterization of samples was performed. The comparison of two experiments showed that there is a relatively good correlation between concentrations obtained after digestion of samples in different labs, under different conditions. As a result of this study, an efficient and relatively inexpensive method for determining the bioaccessibility was set up at Faculty of Mining, Geology and Petroleum Engineering, which makes this kind of tests more accessible and enables new approach in risk assessment studies.
Faculty of Mining, Geology and Petroleum Engineering
2016-04-12 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3857
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 2 (2016): No. 33
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3862
2016-12-17T20:54:18Z
rgn:GEO
"160203 2016 eng "
1849-0409
0353-4529
dc
Comparison of Ordinary and Universal Kriging interpolation techniques on a depth variable (a case of linear spatial trend), case study of the Šandrovac Field
Mesić Kiš, Ivana
ES kralja Tomislava, Ulica Matice hrvatske 1, 31 500 Našice
University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 95, Zagreb, 10 000, Croatia
University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 95, Zagreb, 10 000, Croatia
Universal Kriging has not until now been used for mapping of geological data in Croatia. However, it is one of the most frequently used methods of Kriging, probably the most adequate in cases when the input data is marked by a common trend. That exact feature is often an attribute of deep geological data, and thereby that of structural maps. Mapped surfaces in a row of examples have a structural trend towards one cardinal direction, or a sequence of geological structures, like anticlinorium, is a part of a structural unit of a higher order such as regional monocline. An example is given of geographical trend recognition in e-log Z’ surface spread in Šandrovac Field as well as successful mapping of that marker depth variable by using Universal Kriging.
Faculty of Mining, Geology and Petroleum Engineering
2016-04-12 00:00:00
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https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3862
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 2 (2016): No. 33
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3941
2016-12-17T20:54:18Z
rgn:GEO
"160222 2016 eng "
1849-0409
0353-4529
dc
The characteristics of the production and processing of oil and natural gas in Croatia from 2000 to 2014
Velić, Josipa
Kišić, Katarina
Krasić, Dragan
This research analyzes the characteristics of the production and processing of oil, condensates and natural gas in the Republic of Croatia starting from 2000, until the end of 2014. Amounts of balance sheet (exploitable) reserves of oil and condensates ranges from 9330,92 × 103 m3 in 2005, to 13 471,08 × 103 m3 in 2013, while extracted amounts are gradually declining from 1332,61 × 103 m3 to 639,96 × 103 m3. The ratio of extracted amounts and reserves is gradually declining, meaning that a slight increase in reserves does not affect the extracted amounts. Exploitable reserves of natural gas during the observed period fluctuate greatly. Being peaked in 2007, at 40,919.70 × 106 m3, they reached a low in 2014, at 17,932.98 × 106 m3. Unlike liquid hydrocarbons, the ratio of extracted and exploitable amounts is growing and peaked in 2014. Overall energy demands for oil in Croatia (shown as total consumption of crude oil) amounted to 3032,8 × 103 m3 in 2013, while demands for natural gas amounted to 2809,90 × 106 m3. It is interesting to note that the consumption of oil is rapidly declining, which is a favorable trend from the standpoint of reducing emissions of greenhouse gases. While needs are partly covered by domestic exploitation, the dependence on imports of oil and natural gas is still evident and ranges from 75% to 84% for oil and 28% to 46% for natural gas, without major changes to the trend. The amounts of processed hydrocarbons are declining gradually, especially motor gasoline and fuel oil, while diesel fuel amounts remain mostly the same. Further research as well as development of the exploitation of oil and natural gas is of paramount importance, especially by investing in cadre education and new technologies.
Faculty of Mining, Geology and Petroleum Engineering
2016-04-12 00:00:00
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https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3941
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 2 (2016): No. 33
eng
Copyright (c) 2016 authors and journal
oai:ojs.pkp.sfu.ca:article/3942
2016-12-17T20:53:22Z
rgn:GEO
"160915 2016 eng "
1849-0409
0353-4529
dc
Once grand, now forgotten: what do we know about the superhigh-organic-sulphur Raša coal?
Medunić, Gordana
University of Zagreb http://www.pmf.unizg.hr/geol/gordana.medunic
Rađenović, Ankica
University of Zagreb
Bajramović, Mladen
Udruga Istarski ugljenokopi Raša
Švec, Mirna
University of Zagreb
Tomac, Matea
University of Zagreb
The Istrian coal mines, located in the eastern part of the Istrian Peninsula (Northern Adriatic Sea, Croatia) had by far the most important and economically the most valuable deposits of the anthracite coal reserves in Croatia since the 18th century until the year 1999, when their excavation and use in the coal-fired power plant Plomin ceased. The coal is found within the Palaeocene Kozina limestone beds. Four coal basins, Karojba, Sveti Martin, Pićan, and the Labin basin, hosted seven coal mines, e.g. Tupljak, Potpićan, Kozljak, Štrmac, Raša, Ripenda, and Krapan. The coal has been generally known under the name of Raša coal. It is exceptional in world terms due to its high content of organic sulphur, which can be up to 14%. Herewithin, this paper reviews Croatian scientific publications devoted to various aspects of Raša coal, along with the most important publications on either similar coals or relevant subjects worldwide. A brief introduction deals with the role of coal in electricity production, and the history of coal mining in Istria. The following chapter summarises current knowledge of the coal sulphur geochemistry, with several examples of high-sulphur coals from India and China. It is followed by the geological, geochemical, and physical characterisation of Raša coal. Since perturbations to ecosystems caused by coal combustion have been documented in numerous papers from a number of countries, Croatian studies carried out to determine the impact of Raša coal combustion on the local environment are also presented.
Faculty of Mining, Geology and Petroleum Engineering
2016-09-15 00:00:00
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https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3942
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 3 (2016): No. 34
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/3964
2016-12-17T20:53:22Z
rgn:MIN
"160915 2016 eng "
1849-0409
0353-4529
dc
The Impact of Area and Shape of Tool Cut on Chain Saw Performance
Korman, Tomislav
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb
Kujundžić, Trpimir
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb
Lukačić, Hrvoje
Martinić, Milan
The cutting design of the chain saw is defined by the number, the arrangement and the geometry of the cutting tools. When using chisel cutting tools, the cross sectional area of the cut and the shape of the groove are determined by the width and depth of the cut. The laboratory tests analyzed the impact of the cross sectional area and the shape of the cut on the forces and the specific energy. The testing was performed on a linear cutting machine with tool holders and cutting tools in real-scale size. According to the processed statistical data, increasing the cross sectional area of the cut reduces the specific energy, whereby the width of the cut has a considerably larger impact. The tests have shown that besides the cross sectional area of cut, the shape of the surface also affects the forces and specific energy. Through increasing the width to depth ratio upon a constant cross sectional area of the cut, the value of the specific energy and the cutting forces are reduced. Above the width to depth ratio of 2.5 the cutting forces and the specific energy appear to be constant.
Faculty of Mining, Geology and Petroleum Engineering
2016-09-15 00:00:00
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https://hrcak.srce.hr/ojs/index.php/rgn/article/view/3964
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 3 (2016): No. 34
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4092
2016-12-17T20:53:22Z
rgn:GEO
"160915 2016 eng "
1849-0409
0353-4529
dc
Hydrogeological and hydrogeochemical characteristics of a wider area of the regional well field Eastern Slavonia – Sikirevci
Kopić, Jasna
Loborec, Jelena
Nakić, Zoran
This paper establishes hydrogeological and hydrogeochemical characteristics of a wider area of the regional well field Eastern Slavonia - Sikirevci. The research was conducted based on data gathered from the area of the Federation of Bosnia and Herzegovina and the Republic of Croatia. The aquifer Velika Kopanica is situated at the territory of the Republic of Croatia in the triangular region formed between Kopanica, Gundinci and Kruševica. The River Sava partially flows through it and the aquifer extends beneath the river to the territory of the Federation of Bosnia and Herzegovina from Donji Svilaj in the West to Domaljevac in the East where its yield is the highest. The thickness of the aquifer decreases towards the water body Odžak. It was determined that the groundwater which is extracted from wells of the wider area of the regional well field contains iron, manganese, natural ammonia and arsenic in values exceeding the maximum allowable concentration for drinking water. The increased values of these parameters are a result of mineral composition and reductive conditions in the aquifer environment. By means of a multivariate statistic cluster analysis, an overview of groups of elements is provided based on geochemical affinity and/or origin.
Faculty of Mining, Geology and Petroleum Engineering
2016-09-15 00:00:00
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https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4092
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 3 (2016): No. 34
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4184
2016-12-17T20:53:22Z
rgn:OTH
"160915 2016 eng "
1849-0409
0353-4529
dc
Book review "Petroleum Production Engineering"
Koščak Kolin, Sonja
Here is given the review of the book „Petroleum Production Engineering“ written by Marin Čikeš, Ph. D., a retired Full Professor of the Faculty of Mining, Geology and Petroleum Engineering of the University of Zagreb. The book was published in the year 2015, as a university textbook (Manualia universitatis studiorum Zagrabiensis).
Faculty of Mining, Geology and Petroleum Engineering
2016-09-15 00:00:00
Other papers, book review, commentaries etc.
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https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4184
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 3 (2016): No. 34
eng
Copyright (c) 2016
oai:ojs.pkp.sfu.ca:article/4206
2016-12-17T20:53:22Z
rgn:GEO
"160915 2016 eng "
1849-0409
0353-4529
dc
Layer by layer to a Croatian word "škriljavac"
Matas Ivanković, Ivana
Institut za hrvatski jezik i jezikoslovlje
The theme of this paper are the Croatian terms for schist – škriljac, škriljevac or škriljavac, and for schistose – škriljav or škriljast. Linguistic and professional sources are not uniformed, so from the aspect of word formation, it is discussed which terms fit into the terminological system the best.
Faculty of Mining, Geology and Petroleum Engineering
2016-09-15 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4206
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 3 (2016): No. 34
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4216
2016-12-18T17:39:19Z
rgn:PEE
"161217 2016 eng "
1849-0409
0353-4529
dc
The analysis of water injection systems in sandstone hydrocarbon reservoirs, case study from the western part of the Sava Depression
Ivšinović, Josip
INA d.d., Zagreb
Formation water injection is one of the constituent parts of the hydrocarbon production cycle in the secondary exploitation oil recovery phase. The formation water injection system can be divided the into single and central injection systems. The formation water injection costs have been described in this paper using the examples of fi eld A (central injection system) and fi eld B (single injection system). These are located in the western part of the Sava Depression. The reservoir rocks regarding the oil and gas fi elds A and B are fi ne to middle grained sands and quartz micaceous sandstones that belong to the geological age of Lower Pontian. The average porosity (intergranular) in fi eld A is 15–35% and in fi eld B it is 10-31%, depending on the depth and cementation percentage. Regarding the oil and gas fi elds described in this paper, a cost comparison has been made and an injection system sensitivity analysis as well as an analysis of possible injection systems’ costs for optimization and rationalization.
Faculty of Mining, Geology and Petroleum Engineering
2016-12-17 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4216
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 1 (2017): No. 35
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4328
2016-12-17T20:53:22Z
rgn:GEO
"160915 2016 eng "
1849-0409
0353-4529
dc
A Comparison of Artificial Neural Networks and Ordinary Kriging depth maps of the Lower and Upper Pannonian stage border in the Bjelovar Subdepression, Northern Croatia
Šapina, Marijan
Computerised mapping of subsurface strata is possible with a wide range of methods and techniques, such as geostatistical interpolation and stochastic simulations, but also with geomathematical methods. Geomathematical methods are, for example, the use of statistics in geology and the use of artificial neural networks. Artificial neural networks are primarily used in the case of flawed data and data that is in a non-linear relation. The set hypothesis of successful mapping of depth data using this original artificial neural network algorithm is confirmed using statistical analysis and comparison with geostatistical interpolation methods. The algorithm is made in „R“, an open source statistical computing software, and is used on the mapping of depth of the e-log marker „Rs5“ in the Bjelovar Subdepression, Northern Croatia, that is the border between the Lower and Upper Pannonian stages in the Croatian part of the Pannonian Basin System. The neural network architecture that produced the best responses is a network with two hidden layers, with 10 and 6 neurons, respectively. A backpropagation algorithm is used. Two methods were compared by cross-validation and the neural network produced a mean squared error as 16294.5, and Ordinary Kriging produced 14638.35.
Faculty of Mining, Geology and Petroleum Engineering
2016-09-15 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4328
Rudarsko-geološko-naftni zbornik; Vol. 31 No. 3 (2016): No. 34
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4368
2016-12-18T17:39:19Z
rgn:MIN
"161217 2016 eng "
1849-0409
0353-4529
dc
Gas permeability of geosynthetic clay liners
Vučenović, Helena
University of Zagreb, Faculty of Mining, Geology and Petreoleum Engineering
Domitrović, Dubravko
University of Zagreb, Faculty of Mining, Geology and Petreoleum Engineering
Kovačević Zelić, Biljana
University of Zagreb, Faculty of Mining, Geology and Petreoleum Engineering
Geosynthetic clay liners (GCL) are manufactured hydraulic barriers consisting of mineral and geosynthetic components. They belong to a group of geosynthetic products whose primary purpose is to seal and they have been used in many geotechnical and hydrotechnical applications, landfi lls and liquid waste lagoons for quite a while. They are used in landfill final cover systems to prevent the infi ltration of precipitation into the landfi ll body and the penetration of gases and liquids from the landfill into the atmosphere and environment. Laboratory and fi eld research and observations on regulated landfi lls have proven the eff ectiveness of GCL as a barrier for the infi ltration of precipitation into the landfi ll body as well as the drainage of fl uid beneath the landfill. Due to the presence of high concentrations of gases in the landfill body, there is a growing interest in determining the efficiency of GCL as a gas barrier. It was not until the last twenty years that the importance of this topic was recognized. In this article, current GCL gas permeability studies, the testing methods and test results of gas permeability in laboratory conditions are described.
Faculty of Mining, Geology and Petroleum Engineering
2016-12-17 00:00:00
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https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4368
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 1 (2017): No. 35
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4384
2016-12-18T17:39:19Z
rgn:MIN
"161217 2016 eng "
1849-0409
0353-4529
dc
Ground vibrations level characterization through the geological strength index (GSI)
Mesec, Josip
University of Zagreb, Geotechnical Faculty in Varaždin
Strelec, Stjepan
University of Zagreb, Geotechnical Faculty in Varaždin
Težak, Denis
University of Zagreb, Geotechnical Faculty in Varaždin
This paper analyses the results of trial, construction and quarry blasting, carried out in sediment rock deposits, mainly limestone and dolomite, at diff erent locations in the Republic of Croatia. The division of the three test groups was based on the lithology changes and GSI values of the rock units at these locations. The peak particle velocity measurements with 246 recorded events, was conducted during a long period of six years. Based on the results of seismic measurements, the empirical relationships between peak particle velocity and scaled distance were established for each group. In order to establish a useful relationship between peak particle velocity and scaled distance, simple regression analysis was conducted with the Blastware software program from Instantel. The results of this study can be used to characterize ground vibration levels to the environment, through the geological strength index (GSI).
Faculty of Mining, Geology and Petroleum Engineering
2016-12-17 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4384
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 1 (2017): No. 35
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4425
2018-04-20T13:25:04Z
rgn:PEE
"161217 2016 eng "
1849-0409
0353-4529
dc
Types of fiscal regime in hydrocarbon exploration and production
Karasalihović Sedlar, Daria
University of Zagreb, Faculty of Mining Geology and Petroleum Engineering http://161.53.60.11 http://orcid.org/0000-0002-2763-2863
Barbir, Goran
Brkić, Vladislav
The choice of the right fi scal regime represents the main object of the energy policy concerning hydrocarbon exploration and production for the state government. For the operator and service companies it represents the terms and conditions for practical conducting of the process in whole. This paper analyse aspects of agreements used in the petroleum indus-try. Elements of agreement, regardless of regime, have been described together with their advantages and disadvantages. Due to the fact that the fi scal regime has to be chosen to attract companies willing to invest in exploration and produc-tion, it represents a relevant part of the business strategy and also a base for the decision making process during start up. It has to minimize the risk for the both parties involved and maximize the state’s share during the exploitation phase. For the companies, it has to be attractive enough to balance risks during the exploration phase with profi ts gained during the exploitation phase. The aim of this paper is to show the existing fi scal systems in the petroleum industry and to analyze the process for concluding a contract regarding the exploration and production of hydrocarbons. An overview of diff er-ent business practices in the oil and gas industry with a detailed breakdown of the contract terms between the parties involved have been described in the paper. The aim of this paper is to show the diff erent possibilities of fi nancial regimes which could help during the negotiation process for conducting hydrocarbon exploration and production for everyone involved.
Faculty of Mining, Geology and Petroleum Engineering
2016-12-17 00:00:00
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https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4425
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 1 (2017): No. 35
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4444
2016-12-18T17:39:19Z
rgn:GEO
"161217 2016 eng "
1849-0409
0353-4529
dc
Cross-correlation Modelling of Surface Water – Groundwater Interaction Using the Excel Spreadsheet Application
Posavec, Kristijan
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering http://rudar.rgn.hr/~kposavec/
Vukojević, Perica
Geotehnički studio Ltd. Zagreb, Nikole Pavića 11, 10090 Zagreb
Ratkaj, Matija
IHK Karlovac, Selce 25, 47000 Karlovac
Bedeniković, Tea
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, 10000 Zagreb
Modelling responses of groundwater levels in aquifer systems, which occur as a reaction to changes in aquifer system boundary conditions such as river or stream stages, is commonly being studied using statistical methods, namely correlation, cross-correlation and regression methods. Although correlation and regression analysis tools are readily available in Microsoft Excel, a widely applied spreadsheet industry standard, the cross-correlation analysis tool is missing. As a part of research of groundwater pressure propagation into alluvial aquifer systems of the Sava and Drava/Danube River catchments following river stages rise, focused on estimating groundwater pressure travel times in aquifers, an Excel spreadsheet data analysis application for cross-correlation modelling has been designed and used in modelling surface water – groundwater interaction. Examples of fi eld data from the Zagreb aquifer system and the Kopački rit Nature Park aquifer system are used to illustrate the usefulness of the cross-correlation application.
Faculty of Mining, Geology and Petroleum Engineering
2016-12-17 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4444
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 1 (2017): No. 35
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4449
2016-12-18T17:39:19Z
rgn:GEO
"161217 2016 eng "
1849-0409
0353-4529
dc
Comparative review of Croatian and Indian air pollution studies with emphasis on pollutants derived by coal combustion
Rađenović, Ankica
Medunić, Gordana
Saikia, Binoy K.
Human health, the environment, and climate are being profoundly aff ected by complex pollutant interactions in the atmosphere. Almost all human activities cause the emissions of air pollutants. Their understanding and quantifi cation is the fi rst step towards the control and mitigation of air pollution. The general aim of this paper is to summarise the fi ndings of selected Croatian and Indian papers addressing air pollution, particularly those focusing on sulphur and aerosols associated with coal-fi red power plants. The two countries are essentially diff erent regarding their size, geography, history, economy, industrial potential, to name but a few. However, they both have had certain relations to the fossil fuel extraction and its usage in power stations and industry for decades. Various research approaches are presented, together with a brief outline of national air pollution policies.
Faculty of Mining, Geology and Petroleum Engineering
2016-12-17 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4449
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 1 (2017): No. 35
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4451
2017-02-26T11:27:12Z
rgn:MIN
"170226 2017 eng "
1849-0409
0353-4529
dc
Russian National technological initiative in the sphere of mineral resource usage
Vorobiev, Alexander Egorovich
Institute of Continuous Education Top Managers and Specialists of Fuel and Power Industries, 4 km, Dolinskoe shosse, Ramenskoye, Moscow region, Russia, Professor, Doctor of Engineering
Chekushina, Tatyana
Research Institute of Comprehensive Exploration of Mineral Resources Russian Academy of Sciences, 4 Kryukovsky tupik, Moscow, Russia, Ph.D. in Engineering Science, Assistant Professor
Vorobiev, Kirill
Oil-fi eld Geology, Mining and Oil and Gas Business Department, Engineering Faculty, Peoples’ Friendship University of Russia, 6 Miklukho-Maklaya str., Moscow, Russia, graduated student
Operating efficiency improvement of the Russian company MMC Norilsk Nickel will be determined by the extended involvement in production of both new geogenic off -balance ores from combine deposits and previously accumulated technogenic mineral raw materials – metallized rock mass dumps and sand tailings. This article proposes a complex program of technological initiative in the sphere of mineral resource usage, and justifi es eff ective measures aimed at developing the city-forming mining and metallurgical industry.
Faculty of Mining, Geology and Petroleum Engineering
2017-02-26 12:13:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4451
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 2 (2017): No. 36
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4482
2018-04-18T05:57:44Z
rgn:GEO
"170226 2017 eng "
1849-0409
0353-4529
dc
A comparison of different rinsing methods upon selective dissolution of iron (oxy)hydroxides in soils/sediments
Čambala, Marija
University of Zagreb,
Faculty of Mining, Geology and Petroleum Engineering, student
Hruškova Hasan, Michaela
University of Zagreb,
Faculty of Mining, Geology and Petroleum Engineering, professional associate (head of laboratory)
Mileusnić, Marta
University of Zagreb,
Faculty of Mining, Geology and Petroleum Engineering, Associate Professor https://moodle.srce.hr/eportfolio/user/view.php?id=2722 http://orcid.org/0000-0003-3776-3661
Iron (oxy)hydroxides play an important role in a variety of disciplines, among others, environmental and exploration geochemistry, mineralogy, geology and soil science. In selective leaching procedures, either for the removal of (oxy)hydroxide prior to clay minerals analysis or for the determination of metals in reducible soil/sediment fractions, it is very important to preserve the entire undissolved residue. Therefore, the objectives of the study were: (1) to fi nd the most effective reagent rinsing method which follow the dissolution of (oxy)hydroxides; and (2) to test if the content of Fe (oxi)hydroxides could be determined gravimetrically. The following reagent rinsing methods were tested: (1) centrifugation, (2) filtration, (3) dialysis. The analysis was conducted on the sample of red soil with 5.12% Fe2O3. The time needed for rinsing increased in this order: centrifugation < fi ltration < dialysis. The amount of gravimetrically determined dissolved reducible fraction upon rinsing varies signifi cantly depending on the methods and it is remarkably higher than the
amount of Fe2O3 calculated from iron content determined by atomic absorption in leachate. The most effective reagent rinsing method which follows the dissolution of (oxy)hydroxides using dithionite-citrate-bicarbonate is dialysis. No loss of sample is the advantage of this method, but its disadvantage is time needed for its completion. Centrifugation is relatively rapid, but can lead to loss of the smaller particles. In this case the loss was unacceptably great. Filtration using filter paper is more time consuming than centrifugation and it showed the worst results. The conclusions are that: (1) the content of Fe (oxi)hydroxides cannot be determined gravimetrically upon selective leaching; (2) rinsing of reagents after Fe (oxi)hydroxide removal prior to clay mineral analysis should be carefully selected and performed; (3) centrifugation, accepted rinsing method in all sequential extraction sequences, can cause misleading results.
Faculty of Mining, Geology and Petroleum Engineering
2017-02-26 12:13:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4482
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 2 (2017): No. 36
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4620
2017-02-26T11:27:12Z
rgn:PEE
"170226 2017 eng "
1849-0409
0353-4529
dc
Depleted hydrocarbon reservoirs and CO2 injection wells –CO2 leakage assessment
Gaurina-Međimurec, Nediljka
Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, Zagreb, Croatia,
Full Professor
Novak Mavar, Karolina
INA-Industry of Oil Plc., Lovinčićeva 4, Zagreb, Croatia; SD & HSE Expert, Dsc.
Migration risk assessment of the injected CO2 is one of the fi rst and indispensable steps in determining locations for the implementation of projects for carbon dioxide permanent disposal in depleted hydrocarbon reservoirs. Within the phase of potential storage characterization and assessment, it is necessary to conduct a quantitative risk assessment, based on dynamic reservoir models that predict the behaviour of the injected CO2, which requires good knowledge of the reservoir conditions. A preliminary risk assessment proposed in this paper can be used to identify risks of CO2 leakage from the injection zone and through wells by quantifying hazard probability (likelihood) and severity, in order to establish a risk-mitigation plan and to engage prevention programs. Here, the proposed risk assessment for the injection well is based on a quantitative risk matrix. The proposed assessment for the injection zone is based on methodology used to determine a reservoir probability in exploration and development of oil and gas (Probability of Success, abbr. POS), and modifi ed by taking into account hazards that may lead to CO2 leakage through the cap rock in the atmosphere or groundwater. Such an assessment can eliminate locations that do not meet the basic criteria in regard to short-term and long-term safety and the integrity of the site.
Faculty of Mining, Geology and Petroleum Engineering
2017-02-26 12:13:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4620
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 2 (2017): No. 36
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4687
2018-04-20T13:29:12Z
rgn:MIN
"170226 2017 eng "
1849-0409
0353-4529
dc
Chemical Determination of Heavy Metals in Pb and Zn Concentrates of Trepça (Kosovo) and Correlations Coefficients Study Between Chemical Data
Gashi, Fatbardh
Department of Chemistry, University of Prishtina Kosovo
Bilinski, Stanislav Frančišković
Institute “Ruđer Bošković”, Division for marine and environmental research, POB 180, HR-10002 Zagreb
Bilinski, Halka
Institute “Ruđer Bošković”, Division for marine and environmental research, POB 180, HR-10002 Zagreb
Thaci, Bashkim
Departyment of Chemistry, University of Prishtina Kosovo
Shosholli, Shkurta
Departyment of Chemistry, University of Prishtina Kosovo
Kosovo ore deposits are located in the Trepça belt which extends for over 80 km. The concentrate produced by the flotation process of the Trepça metallurgical corporation contains a considerable quantity of valuable metals, such as Pb, Zn, Fe and minor accompanying metals such as Cd, Cu, As, Sb, Bi, Ag, Au, etc. The subject of this work was to assess the concentration of major and minor metals in lead and zinc concentrates of Trepça and to study the correlation coefficients between metals. Chemical determination of concentrates was performed by using atomic absorption spectroscopy (AAS). In the content on lead concentrate samples, the following were found: Pb>Fe>Zn> Ag> As>Sb>Cd. In the content of zinc concentrate, the following were found: Zn>Fe>Pb>Ag>As>Cd. The program “Statistica ver. 6.0” has been used for calculations of basic statistical parameters, relationships between data and cluster analysis of R-mode. R-mode cluster analysis on lead concentrate samples showed that Pb has the closest linkages with Fe and they form one branch of the dendogram. On the zinc concentrate samples, Zn has the closest linkages with Fe and they form one branch of the dendogram.
Faculty of Mining, Geology and Petroleum Engineering
2017-02-26 12:13:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4687
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 2 (2017): No. 36
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4763
2016-12-18T17:39:19Z
rgn:OTH
"161217 2016 eng "
1849-0409
0353-4529
dc
The Legend of Aquarius
Bedeković, Gordan
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
Story about issue cover picture
Faculty of Mining, Geology and Petroleum Engineering
2016-12-17 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4763
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 1 (2017): No. 35
eng
Copyright (c) 2016 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4769
2017-02-26T11:27:12Z
rgn:MIN
"170226 2017 eng "
1849-0409
0353-4529
dc
Fundamental models of structural stability
Jaguljnjak Lazarević, Antonia
University of Zagreb,
Faculty of Mining, Geology and Petroleum Engineering, Assistanat Professor
Uroš, Mario
University of Zagreb,
Faculty of Civil Engineering, Assistanat Professor
Čengija, Ana
2 Struge 22, HR-10000 Zagreb, Croatia, graduate student of Mining Engineering
In this paper, basic structural stability phenomena are described. After some general comments about stability in the fi eld of civil engineering, four elementary sources of nonlinearity are mentioned: of equilibrium equations, strain (geometry) relations, material (stress-strain) law, force and displacement boundary conditions. Four fundamental stability models are analysed, both ideal (perfect) and with geometric imperfection. Besides geometrically exact theory, initial post-buckling behaviour and linearization are briefl y sketched. This paper is concluded with comments about the infl uence of plasticity.
Faculty of Mining, Geology and Petroleum Engineering
2017-02-26 12:13:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4769
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 2 (2017): No. 36
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4878
2017-02-26T11:27:12Z
rgn:GEO
"170226 2017 eng "
1849-0409
0353-4529
dc
A new freeware program for the Probability of Success calculation of new gas discoveries within the Croatian part of the Po depression
Režić, Mate
Alojzija Stepinca 16 Street, 21000 Split, Master of Geology
Varenina, Andrija
Jabuka 9 Street, 21240 Trilj, Master student, University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
The aim of this paper is to introduce an application in the form of a transparent freeware program which can be used for the assessment of the Probability of Success (abbr. POS, also POS and geological probability are synonyms) in finding new gas discoveries within the Croatian part of the Po depression. A deterministic approach is applied and includes five geological categories (traps, reservoirs, source rocks, migration and hydrocarbon preservation) with certain geological events that depend on the geological settings of the Northern Adriatic subsurface. The chosen probability classes include five, three or two numerical and textual values as follows: 1.00 for certain, 0.75 for very probable, 0.66 and 0.50 for reliable / probable, 0.33 and 0.25 for unreliable / low probable and 0.05 for not proven / improbable events. The program is made as an improvement in the sense of faster calculation according to a previous assessment that was based on a previously published Croatian model of the POS using Microsoft Excel and GeoProbe Modeling 1.1 program as an example, which
is used to calculate the geological probability of hydrocarbon discoveries for the Croatian part of the Panonian Basin System. The program is in English and it is done in the C# programming language.
Faculty of Mining, Geology and Petroleum Engineering
2017-02-26 12:13:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4878
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 2 (2017): No. 36
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4894
2017-10-06T17:55:18Z
rgn:GEO
"170621 2017 eng "
1849-0409
0353-4529
dc
Fractal analysis of fracture systems in Upper Triassic Dolomites in Žumberak Mountain, Croatia
Pavičić, Ivica
Faculty of Mining, Geology and Petroleum Engineering
Dragičević, Ivan
Faculty of Mining, Geology and Petroleum Engineering
Vlahović, Tatjana
Croatian Natural History Museum
Grgasović, Tonći
Croatian Geological Survey
This paper presents results of fractal analysis of fracture systems in upper Triassic dolomites in Žumberak Mountain, Croatia. Mechanical rock characteristics together with structural and diagenetic processes results with fracture systems that can be considered as fractals. They are scale-invariant in specific range of scales. Distribution of fractures can be than described with power law distribution and fractal dimension. Fractal dimension is a measure of how fractures fill the space. Fractal dimension can be estimated form photographs of outcrops by converting photographs to binary photographs. In binary photo there is only black (rock or fractures) and white (fractures or rock). Fractal dimension is then estimated based on box-counting method. In this paper we present results of fractal analysis from three outcrops. Results are very similar to previous published results from outcrops of dolomites in Slovenia. Obtained fractal dimensions are in range 2,69-2,78 and it depends on how fracture systems are distributed in the outcrop. Lower values indicate smaller number of fractures and higher significance of larger fractures. Higher values indicate distribution of more similar sized fractures throughout whole outcrop. Fractal dimension is very significant parameter in rock fracture system characterisation sense it describes how fractures are distributed in the outcrop. It can be used in discrete fracture network modelling if spatial distribution of fractures is represented with power law distribution.
Faculty of Mining, Geology and Petroleum Engineering
2017-06-21 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4894
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 3 (2017): No. 37
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4897
2017-10-06T17:55:18Z
rgn:OTH
"170621 2017 eng "
1849-0409
0353-4529
dc
Analysis of radar precipitation estimation in Central Croatia
Jurlina, Toni
Good monitoring of precipitation is of great importance in many fields of human activity that use meteorological infor- mation. Precipitation is highly variable in space and time and therefore it is advisable to use tools that provide good spatial and temporal resolution of the phenomenon. The meteorological radar from the Radar Center of Bilogora is used for this purpose. However, radar precipitation is not measured directly but is estimated in a way that reflected electro- magnetic signal turns into precipitation using the Z-R relation. This paper analyses the period from 1. 12. 2015. to 31. 8. 2016., comparing the ground measurements of hourly accumulated precipitation from the main meteorological stations and radar associated pixels precipitation estimation. It was found that radar overestimates precipitation. It is possible to reduce such systematic radar estimation errors with a climatological bias adjustment.
Faculty of Mining, Geology and Petroleum Engineering
2017-06-21 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4897
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 3 (2017): No. 37
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4907
2017-10-11T17:41:27Z
rgn:GEO
"171010 2017 eng "
1849-0409
0353-4529
dc
Contribution to the Genesis of Thermal Water of the North-east Perimeter of the Zenica-Sarajevo Basin, Bosnia and Herzegovina
Skopljak, Ferid
Šarić, Ćazim
Pobric, Vedran
The phenomena of thermal waters in the northeastern periphery of the Zenica-Sarajevo basin is caused by the geological structure, structural-tectonic and hydrogeological characteristics of the terrain. The genesis had not been fully addressed before. This paper presents the study of the genesis of thermal waters based on the geological structure, structural-tectonic and hydrogeological characteristics of the terrain, and physiochemical and isotopic composition of water. The results provide a new contribution to the structure of this part of the Zenica-Sarajevo basin and create a more realistic foundation for the future research of thermal water in this area.
Faculty of Mining, Geology and Petroleum Engineering
2017-10-10 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4907
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 4 (2017): No. 38
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4929
2017-10-06T17:55:18Z
rgn:MIN
"170621 2017 eng "
1849-0409
0353-4529
dc
Selection of variables for the Croatian municipal solid waste generation model
Grbes, Anamarija
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
The MSW generation models are important elements of the waste management planning. This paper gives the findings of the second part of the research on Croatian MSW generation mechanism. The correlations of 17 variables are shown. The relationships between the variables are discussed. In the conclusion, independent variables to be hypothesised and tested in a model for the next part of the research are proposed.
Faculty of Mining, Geology and Petroleum Engineering
2017-06-21 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4929
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 3 (2017): No. 37
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4936
2017-10-06T17:55:18Z
rgn:PEE
"170621 2017 eng "
1849-0409
0353-4529
dc
Experimental calibration of underground heat transfer models under a winery building in a rural area
Tinti, Francesco
University of Bologna - Department of Civil, Chemical, Environmental and Materials Engineering http://orcid.org/0000-0002-6750-9368
Barbaresi, Alberto
University of Bologna - Department of Agricultural Sciences
Ferrari, Marco
University of Bologna - Department of Civil, Chemical, Materials and Environmental Engineering
Torreggiani, Daniele
University of Bologna - Department of Agricultural Sciences
Tassinari, Patrizia
University of Bologna - Department of Agricultural Sciences
Elkarmoty, Mohamed
University of Bologna - Department of Civil, Chemical, Materials and Environmental Engineering
Bonduà, Stefano
University of Bologna - Department of Civil, Chemical, Materials and Environmental Engineering
Ground temperature and hydrogeological conditions are key parameters for many engineering applications, such as the design of building basements and underground spaces and the assessment of shallow geothermal energy potential.
Especially in urban areas, in the very shallow depths, it is diffi cult to fi nd natural undisturbed underground thermal conditions because of anthropic interventions. The assessment of underground behaviour in disturbed conditions will become more and more relevant because of increasing awareness to energy effi ciency and renewable energy topics. The purpose of this paper is to show a three-dimensional representation - based on models calibrated on experimental data - of the underground thermal behaviour aff ected by a building in a rural area in Italy. Temperature varies in space and time and it depends on ground, climate and building characteristics, and all these parameters are taken into account by the seasonal periodic modelling implemented. The results obtained in a context of low urbanization indirectly suggest the importance of these eff ects in dense urban areas; taking greater account of these aspects could lead to improvements in the design of underground spaces and geo-exchanger fi elds for geothermal energy exploitation.
Faculty of Mining, Geology and Petroleum Engineering
2017-06-21 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4936
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 3 (2017): No. 37
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4950
2017-10-06T17:55:18Z
rgn:PEE
"170621 2017 eng "
1849-0409
0353-4529
dc
Development of Tight Oil Resources in USA: Profitability of Exploitation and Effect of Macroeconomic Indicators in Volatile Oil Price Environment
Strpić, Kristina
Faculty of mining-geology and petroleum engineering student
Miličević, Monika
Faculty of mining-geology and petroleum engineering student
Kurevija, Tomislav
Faculty of mining-geology and petroleum engineering
Associate Professor
Large scale development of tight oil resources in US started after 2010. with following five-year period of favorable steady increase in crude oil price. During this relatively short expansion cycle, operating and capital expenses changed drastically for main tight oil plays due to technological improvements in both well drilling and completion, expansion of service sector as well as loose government monetary policy which allowed favorable financing. This paper analyzed trends in costs during expansion period, as well as correlation of oil price to number of operating rigs and production quotas. After 2008/2009. world financial crisis economy recovery in US was somewhat sluggish and it caused extreme volatile environment in both equity and commodity markets. In such volatile environment intra-day crude oil prices, as well as other commodities and equities, show significant reaction to monthly published macroeconomic indicator reports, which give better overviews of trends in economic recovery. Prior to announcement, these reports always have forecasted value determined by consensus among market analysts. Therefore, any positive or negative surprise in real value tends to influence price of oil. This paper investigated influence of such macroeconomic reports to closing intraday oil price, as well as effect of other important daily market indices. Analysis showed that only Producer Price Index (PPI), among other indicators, has statistical significance of affecting intraday closing oil price.
Faculty of Mining, Geology and Petroleum Engineering
2017-06-21 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4950
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 3 (2017): No. 37
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/4997
2017-10-06T17:55:18Z
rgn:GEO
"170621 2017 eng "
1849-0409
0353-4529
dc
Theory of deterministical and stochastical indicator mapping methods and their applications in reservoir characterization, case study of the Upper Miocene reservoir in the Sava Depression
Novak Zelenika, Kristina
INA - Oil industry Plc.
The paper describes indicator based geostatistical methods (Indicator Kriging and Sequential Indicator Simulations),mostly used for facies mapping or facies modeling. Although it is assumed that in facies modelling variables should be descrete, it is possible to apply these methods on continuous variables as well. Continuous variables such as porosity can very well describe lithofacies. Methodology includes series of cut-offs. Indicator Kriging maps show probability of certain lithofacies appearing in some location. On the other hand, stochastical realizations provide different number of solutions for the same input data set. Those solutions can be very similar, but never identical. It is important to emphasize that all obtained solutions or results are equally probable. Results of Sequential Indicator Simulations are also probability maps. There are several advantages for Indicator based methods. They do not need normality for the input dataset, they can be implemented in case of bimodal distribution, and they can show connectivity of the largest or smallest values.
Faculty of Mining, Geology and Petroleum Engineering
2017-06-21 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/4997
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 3 (2017): No. 37
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5011
2017-10-11T17:41:27Z
rgn:PEE
"171010 2017 eng "
1849-0409
0353-4529
dc
Oil and Gas Futures and Options Market
Nosić, Ante
INA Industrija nafte d.d.
V. Holjevca 10, Zagreb, 10000
Karasalihović Sedlar, Daria
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, 10 000 Zagreb http://161.53.60.11 http://orcid.org/0000-0002-2763-2863
Jukić, Lucija
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, 10 000 Zagreb
Energy mineral resources markets are represented by complex supply and demand ratios which are depending on different factors such as technical (transport) and geopolitical. The main specific of energy markets is represented by an uneven geographic distribution of hydrocarbon reserves and exploration on one hand and energy consumption on the other. World oil markets, although geographically localized, because of specific market trade, represent unique global market with decreasing price difference. Price differences are result of development of a transport possibilities of oil supply. Development of transport routes of natural gas and increasing number of liquefied natural gas terminals in the world give pressure to natural gas market and its integration into global gas market. Integration of regional gas markets into a common European gas market is main energy policy of EU concerning natural gas. On the other hand, there are still significant price differences on some markets (e.g. United States of America - South East Asia). Development of global energy markets is enabled by development of a futures and options contracts of an energy trade which have replaced bilateral contract deals between producers and consumers. Futures contracts are standardized contracts traded on exchanges. Buyer agrees to buy certain quantity of stock for an agreed upon price and with some future delivery date. Option is a contract which gives a buyer the option of the right to buy (or sell, depending on the option) an asset at predetermined price and at a later date. Stocks price risk can be managed with the purchase and selling futures and options contracts. This paper deals with futures and options energy markets and their market strategies.
Faculty of Mining, Geology and Petroleum Engineering
2017-10-10 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5011
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 4 (2017): No. 38
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5026
2017-12-18T16:23:38Z
rgn:GEO
"171216 2017 eng "
1849-0409
0353-4529
dc
A software sensor for in-situ monitoring of the 5-day biochemical oxygen demand
Kasem, Rana
ALabdeh, Dimah
Noori, Roohollah
University of Tehran https://orcid.org/0000-0002-7463-8563
Karbassi, Abdulreza
Due to the time-consuming procedure for determining the 5-day biochemical oxygen demand (BOD5), the present study developed two software sensors based on artificial intelligence techniques to estimate this indicator instantaneously. For this purpose, feed-forward and radial basis function neural networks (FFANN and RBFANN, respectively) were tuned to estimate the maximum values of BOD5 (BOD5(max)) as a function of average, maximum and minimum dissolved oxygen in the Sefidrood River. Also, Levenberg-Marquardt (LM), resilient back propagation (RP), and scaled conjugate gradient (SCG) algorithms were used to optimize the FFANN parameters. The results demonstrated that the performance of LM algorithm in tuning the FFANN was better than others, in verification step. Besides, the performance of both FFANN and RBFANN models for prediction of the BOD5(max) was approximately the same.
Faculty of Mining, Geology and Petroleum Engineering
2017-12-16 19:38:17
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5026
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 1 (2018): No. 39
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5028
2017-10-11T17:41:27Z
rgn:MPS
"171010 2017 eng "
1849-0409
0353-4529
dc
Study of Distributed Activation Energy Model using Various Probability Distribution Functions for the Isothermal Pyrolysis Problem
Dhaundiyal, Alok
HZU http://orcid.org/0000-0002-3390-0860
Singh, Suraj B.
The main aim of this paper is to do the comparative analysis of predicted results obtained by using the various probability distribution functions. The predicted nthorder distributed activation energy model (DAEM) results are obtained after applying the asymptotic expansion technique on the DAEM. Pyrolysis of loose biomass under the isothermal condition is considered to know the validity of distributed activation energy model (DAEM) for the different type of distribution functions of activation energies f (E).
Faculty of Mining, Geology and Petroleum Engineering
2017-10-10 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5028
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 4 (2017): No. 38
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5033
2017-10-11T17:41:27Z
rgn:GEO
"171010 2017 eng "
1849-0409
0353-4529
dc
Contribution to terminology and application of new geostatistical mapping methods in Croatia - Universal Kriging
Mesić Kiš, Ivana
ES kralja Tomislava, Ulica Matice hrvatske 1, 31 500 Našice (geography teacher)
PhD Student, University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 102 a, Zagreb, 10 000, Croatia
Advancement of science and computer development enabled the processing and analysis of large amounts of data for which the geostatistical methods have become indispensable when researching and presenting the results in a variety of geosciences. One of the most noted and most accurate geostatistical estimation method is Kriging method, which estimates the value of the analysed variables at unsampled locations. There are several Kriging techniques, while the most widely used is Ordinary Kriging, at the global level, as well as in Croatian geology. Here was Universal Kriging described, the purpose of its use and the terminology associated with it in order to facilitate the understanding and use of this technique. It is a technique that is most appropriate when the input data is marked by a trend, and as such can often be applied in geology.
Faculty of Mining, Geology and Petroleum Engineering
2017-10-10 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5033
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 4 (2017): No. 38
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5058
2017-12-18T16:17:11Z
rgn:MIN
"171216 2017 eng "
1849-0409
0353-4529
dc
Detonography: Making of renaissance mine
Stanković, Siniša
Faculty of mining, geology and petroleum engineering, University of Zagreb
Žbulj, Matko
Faculty of mining, geology and petroleum engineering, University of Zagreb
Škrlec, Vinko
Faculty of mining, geology and petroleum engineering, University of Zagreb
Using the force of explosive authors had made a print of the picture of Renaissance mine onto an aluminium plate. This technique is called Detonography. It has been introduced and developed by Evelin Rosenberg with a number of her colleagues/co-workers, based on “Munroe effect”. To determine the optimal parameters of blasting and supporting materials a large number of laboratory testing has been made on smaller samples.
Faculty of Mining, Geology and Petroleum Engineering
2017-12-16 19:38:17
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5058
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 1 (2018): No. 39
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5059
2017-10-11T17:41:27Z
rgn:MIN
"171010 2017 eng "
1849-0409
0353-4529
dc
A practical approach to the ground oscillation velocity measurement method
Stanković, Siniša
Faculty of mining, geology and petroleum engineering, University of Zagreb
Dobrilović, Mario
Faculty of mining, geology and petroleum engineering, University of Zagreb
Bohanek, Vječislav
Faculty of mining, geology and petroleum engineering, University of Zagreb
The use of an explosive’s energy during blasting includes undesired eff ects on the environment. The seismic infl uence of a blast, as a major undesired eff ect, is determined by many national standards, recommendations and calculations where the main parameter is ground oscillation velocity at the field measurement location. There are a few approaches and methods for calculation of expected ground oscillation velocities according to charge weight per delay and the distance from the blast to the point of interest. Utilizations of these methods and formulas do not provide satisfactory results, thus the measured values on diverse distance from the blast fi eld more or less diff er from values given by previous calculations. Since blasting works are executed in diverse geological conditions, the aim of this research is the development of
a practical and reliable approach which will give a diff erent model for each construction site where blasting works have been or will be executed. The approach is based on a greater number of measuring points in line from the blast fi eld at predetermined distances. This new approach has been compared with other generally used methods and formulas through the use of measurements taken during research along with measurements from several previously executed projects. The results confi rmed that the suggested model gives more accurate values.
Faculty of Mining, Geology and Petroleum Engineering
2017-10-10 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5059
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 4 (2017): No. 38
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5064
2017-10-11T17:41:27Z
rgn:MIN
"230925 2023 eng "
1849-0409
0353-4529
dc
Selected results of determining the friction interaction coefficient between crushed stone and polyester strip
Gradiški, Karolina
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering http://www.rgn.unizg.hr/hr/kontakti/telefonski-imenik/djelatnici?djelatnik=karolina-gradiski
Mulabdić, Mensur
Faculty of Civil Engineering Osijek
Minažek, Krunoslav
Faculty of Civil Engineering Osijek
In the past twenty years in Croatia, a number of reinforced earth constructions have been built, of which two reinforced earth walls stand out due to their dimensions: Strikići and Sveta Trojica. In the building of these walls, polyester strips were used as reinforcement elements, whereas as fi ll material crushed stone aggregate was used. For designing these constructions, knowledge about the interaction mechanisms between the polyester strip and the soil is required. So far, most of the published studies have been directed to the determination of the friction interaction coeffi cient of the poly-ester strip and the fi ll material which was sand or gravel, whereas tests on the interaction between the geosynthetic strip and the crushed stone aggregate have not been performed. In order to determine the friction interaction coeffi cient between the crushed stone aggregate which is commonly used as fi ll material and the geosynthetic strip, pull-out tests of the polyester strip were carried out. Apart from pull-out tests, large direct shear tests were performed to determine shear strength parameters of crushed stone strength. Predictions from the numerical model were compared to a series of pull-out tests, proving that the numerical model provides reasonable predictions of pull-out behavior.
Faculty of Mining, Geology and Petroleum Engineering
2017-10-10 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5064
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 4 (2017): No. 38
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5066
2017-12-18T16:18:17Z
rgn:MIN
"171216 2017 eng "
1849-0409
0353-4529
dc
New method of gas drainage as a solution of danger phenomena in underground coal mines
Zapletal, Pavel
VŠB - Technical univerzity of Ostrava
Koudelková, Jaroslava
VŠB - Technical univerzity of Ostrava
Zubíček, Václav
VŠB - Technical univerzity of Ostrava
Kráľ, Tomáš
VŠB - Technical univerzity of Ostrava
Mokrošová, Andrea
VŠB - Technical univerzity of Ostrava
The further development of coal mining in different countries and in India is connected with many problems. Very serious are emission of gas, sudden outbursts of gas and coal, mine fires, dustiness, spontaneous combustion, methane concentration. The article deals with these problems solving. It describes the new method applied in coal mines in the Czech Republic that has brought very good results.
Faculty of Mining, Geology and Petroleum Engineering
2017-12-16 19:38:17
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5066
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 1 (2018): No. 39
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5110
2017-10-11T18:00:12Z
rgn:MIN
"171010 2017 eng "
1849-0409
0353-4529
dc
Mapping and modelling fractures using ground penetrating radar for ornamental stone assessment and recovery optimization: Two case studies
Elkarmoty, Mohamed
Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy
Colla, Camilla
Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy
Gabrielli, Elena
Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy
Kasmaeeyazdi, Sara
Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy
Tinti, Francesco
Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy
Bonduà, Stefano
Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy
Bruno, Roberto
Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy
Rock mass is typically characterized by inherent fractures that cause natural blocks of rocks. Unplanned cutting of stone deposits in quarries may lead to over-producing waste (rock debris) or extracting unfi t (fractured) stone blocks. This paper presents two case studies through the use of low and high frequency Ground Penetrating Radar (GPR) antennas to detect fractures in two benches of a quarry. In the fi rst case study, a high frequency GPR antenna was used aiming to: (i) compare the GPR results with a map of the out-cropping fracture intensity in the bench surface, developed using the data of the GPR survey marks and interpolated by the Ordinary Kriging technique, and (ii) present how sub-vertical fractures can be numerically modelled in three dimensions from the GPR results. The second case study was focused on using a low frequency antenna to detect large aperture size of fracture surfaces as deep as possible in order to evaluate a deposit stratum before quarrying. This could be done through studying the refl ections from a 3D cross-sectional GPR model and
a 3D transparent GPR model. In the discussion section, an exploitation planning approach, based on modelling fractures as 3D surfaces, is theoretically and graphically proposed to optimize the stone production recovery. The two case studies showed that GPR is a successful tool for the assessment of ornamental stone deposits and a promising tool for recovery optimization.
Faculty of Mining, Geology and Petroleum Engineering
2017-10-10 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5110
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 4 (2017): No. 38
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5204
2017-10-11T17:41:27Z
rgn:GEO
"171010 2017 eng "
1849-0409
0353-4529
dc
An geological overview of glacial accumulation and erosional occurrences at the Velebit and the Biokovo Mts., Croatia
Velić, Josipa
Rudarsko-geološko-naftni fakultet
Velić, Ivo
Croatian geological survey, Sachsova 2, HR10000 Zagreb;
Croatian geological summer school, Pančićeva 5, HR 10 000 Zagreb
Kljajo, Dubravka
Public Institution Nationak Park Northern Velebit, Krasno 96, HR 53 274 Krasno
Protrka, Ksenija
Public Institution Nature Park Biokovo, Marineta - Mala obala 16, HR-21 300 Makarska
Škrabić, Hrvoje
Public Institution Nature Park Biokovo, Marineta - Mala obala 16, HR-21 300 Makarska
Špoljar, Zlatko
Croatian geological summer school, Pančićeva 5, HR 10 000 Zagreb
Numerous accumulation and erosional forms originating from the activity of small valley glaciers or cirque glaciers occur in the highest mountains in Croatia: Velebit (1757 m) and Biokovo (1762 m). They were produced during the Upper Pleistocene, in the Würm glacial stage of the Alpine classification.
Accumulation forms comprise ground, terminal and recessional moraines, drumlins, eskers, glacial erratics and glaciofluvial and glaciolacustrine sediments. Single ridge eskers are often associated with areas of kame and kettle topography. Among erosional occurrences roche moutonnée (sheepback rocks), U-shaped valleys ranging in size from meso-macro, arêtes, hanging valleys, meso-sized cirques, kettles, and striations were noted. In Croatian Dinarides such forms in most cases occur between 900 and 1400 meters altitude. During the early to middle Würm glacial maximum, the snow line was above 900 m, perhaps even above 1000 m altitude, and sea levels were 120 meters lower than at present day. Considering the features of the present relief, ice cover was probably 200 to 300 m thick. Features of drumlins, eskers and kettles point to warm-based glaciers. The drumlins are small – up to 100 meters long and 50 meters wide, with the most common long axis ranging orientation from 130o – 310o. The near total absence of platy clasts, as well as their stratigraphic affiliation, largely reflects features of source rocks.
Faculty of Mining, Geology and Petroleum Engineering
2017-10-10 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5204
Rudarsko-geološko-naftni zbornik; Vol. 32 No. 4 (2017): No. 38
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5222
2017-12-18T16:19:53Z
rgn:MIN
"171216 2017 eng "
1849-0409
0353-4529
dc
Metal waste management and recycling methods in the nuclear power plant decommissioning and dismantling process
Mostečak, Ana
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering http://orcid.org/0000-0002-0529-2036
Bedeković, Gordan
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
Decommissioning and dismantlement of nuclear power plants (NPP) present a final phase of the nuclear power plant lifetime and essential part of an effective nuclear safety culture. While some countries are implementing nuclear exit strategies and other building new nuclear power plants or prolonging their lifetimes, decommissioning of facilities is imminent. This paper gives a short overview on decommissioning and dismantling strategies and techniques as an introduction to the applicability of radioactive metal waste recycling and reuse. General estimations suggest that majority of the waste mass resulting from decommissioning and dismantling is radiologically unrestricted material. Remaining one-third is the radioactive material with different ranges of radioactivity. To present radioactive metal scrap recycling in practice, paper addresses estimations on metal waste amounts resulting from decommissioning, use of melting as a possible recycling method (with regard to secondary waste generated) and aspects of environmental and health impacts. Additionally, a best practice example of decommissioning process in a pressurized water reactor (PWR) technology NPP is given to provide context for possible future decommissioning of NPP Krško. After consideration of available data on decommissioning waste management, the conclusion is that while the decision on decommissioning strategies and technologies is not straightforward but unique to each country, current experiences give important context to complexity and potential of decommissioning and provide a basis for future actions.
Keywords: nuclear power plants, decommissioning and dismantling, metal recycling, waste management
Faculty of Mining, Geology and Petroleum Engineering
2017-12-16 19:38:17
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5222
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 1 (2018): No. 39
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5437
2017-12-18T16:20:52Z
rgn:MIN
"171216 2017 eng "
1849-0409
0353-4529
dc
The development of a novel model for mining method selection in a fuzzy environment; case study: Tazareh Coal Mine, Semnan Province, Iran
Asadi Ooriad, Fatemeh
Yari, Mojtaba
Bagherpour, Raheb
Khoshouei, Mehrbod
Mining method selection (MMS) for mineral resources is one of the most significant steps in mining production management. Due to high costs involved and environmental problems, it is usually not possible to change the coal mining method after planning and starting the operation. In most cases, MMS can be considered as an irreversible process. Selecting a method for mining mainly depends on geological, geometrical properties of the resource, environmental impacts of exploration, impacts of hazardous activities and land use management. This paper seeks to develop a novel model for mining method selection in order to achieve a stable production rate and to reduce environmental problems. This novel model is illustrated by implementing for Tazareh coal mine. Given the disadvantages of the previous models for selecting coal mining method, the purpose of this research is modifying the previous models and offering a comprehensive model. In this respect, TOPSIS method is used as a powerful multi attribute decision-making procedure in Fuzzy environment. After implementation of the presented model in Tazareh coal mine, long wall mining method has been selected as the most appropriate mining method.
Faculty of Mining, Geology and Petroleum Engineering
2017-12-16 19:38:17
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5437
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 1 (2018): No. 39
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5440
2017-12-18T16:21:56Z
rgn:PEE
"171216 2017 eng "
1849-0409
0353-4529
dc
The Cost Analysis of the Separation of Produced Formation Water from the Hydrocarbon Reservoir Using the Example of the Upper Miocene Sandstone Deposits of the Sava Depression
Ivšinović, Josip
INA d.d., Zagreb
Formation water is gathered during the working life of the hydrocarbon reservoir alongside the oil and/or gas and it mostly constitutes the recovery's dominant fluid. The produced formation water is separated during the process of dehydration. This thesis deals with the formation water separation costs regarding the fields A, B and C which are located in the western part of the Sava Depression. The dehydration process regarding the field A is executed in three locations, and regarding the fields B and C it is executed in one location. The technological system of formation water separation and the geological characteristics of the above mentioned reservoirs is represented. A statistical analysis regarding the formation water separation costs has been made, the costs have been statistically estimated and a correlation between the costs relevant for the usual formation water separation process has also been made.
Faculty of Mining, Geology and Petroleum Engineering
2017-12-16 19:38:17
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5440
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 1 (2018): No. 39
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5491
2018-04-03T18:47:39Z
rgn:PEE
"180223 2018 eng "
1849-0409
0353-4529
dc
CCS technology: overview of projects, technology and monitoring
Gaurina-Međimurec, Nediljka
Novak Mavar, Karolina
Majić, Matej
Carbon capture and storage (CCS) in terms of geological sequestration presents the process of capturing CO2 from large point sources, transporting it to a storage site, and depositing it into an underground geological formation.
In addition to ecological benefits, underground injection of CO2 shows certain potential risks associated with unwanted migration of CO2 to groundwater and surface, so the possibility of carrying out such projects depends on the possibility of reducing mentioned risks to an acceptable level. For this purpose, a detailed risk assessment and analysis must be carried out, serving as the basis for a monitoring plan. Well designed and implemented monitoring plan and program provide important data on site integrity, well injectivity, and entire storage complex performance.
This paper gives the overview of large scale and pilot projects of CO2 capture and geological storage in operation, under construction and in the phase of development all over the world, technology basics and available monitoring techniques. An example of CCS project monitoring is given through the monitoring program of the Lacq pilot project in France
Faculty of Mining, Geology and Petroleum Engineering
2018-02-23 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5491
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 2 (2018): No. 40
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5585
2018-04-18T12:55:17Z
rgn:MIN
"180223 2018 eng "
1849-0409
0353-4529
dc
Characterization of metal grades in a stockpile of an Iron Mine (Case study - Choghart iron mine, Iran)
Kasmaee, Sara
University of Bologna - Department of Civil, Chemical, Environmental and Materials Engineering
Tinti, Francesco
University of Bologna - Department of Civil, Chemical, Environmental and Materials Engineering
Bruno, Roberto
University of Bologna - Department of Civil, Chemical, Environmental and Materials Engineering
In any mining operation due to the cut-off grade (economic criteria), materials classify into the ore and waste. The material with grade equal to or higher than the cut-off grade is considered as ore and the material with grade less than the cut-off grade is transported as wastes to the waste dumps. However, because of increasing metal demand, depleting of in situ ore reserves and so the reduction of cut-off grades for many metals, the mentioned waste dumps were considered as valuable ore reserves named stockpiles. In this paper, multivariate geostatistics was used to estimate the iron grades of two stockpiles following the sequential of piling procedures from the main source - the ore deposit - to the piling field. One stockpile is characterized by phosphorous concentration ((P %) > 0.6 %), while the other by iron concentration ((Fe %)< 50%). Since economic and physical constraints made sampling physically and economically problematic, the grade distribution and variability were estimated on the basis of primary blast-hole data from the main ore body and the mine’s long-term planning policy. A geostatistical model was applied to the excavated part of the iron deposit and the stockpile, by reconstructing ore selection, haulage and piling method. Results were validated through spatial variability of iron and phosphorous concentrations by comparing grade variability (Fe and P) with mining and pilling units. This methodology allows characterizing the iron grades within stockpiles without any extra sampling.
Faculty of Mining, Geology and Petroleum Engineering
2018-02-23 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5585
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 2 (2018): No. 40
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5598
2018-04-03T18:47:39Z
rgn:OTH
"180223 2018 eng "
1849-0409
0353-4529
dc
Preliminary design of potential storage facility for low and intermediate level radioactive waste
Mališ, Tanja
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
Milling, Anni
Jaguljnjak-Lazarević, Antonia
An issue concerning the management of radioactive waste (RAW) in the Republic of Croatia continuously rises due to the lack of systematic solutions. In this paper emphasis is being placed on the storage of RAW, as one of the important phases of RAW management. The current RAW storage facilities are not sufficient and there is a need for a new facility for low and intermediate level radioactive waste (LILW), since such waste accounts for the largest part of RAW. For this reason a preliminary estimate for a one-storey structure was carried out, a potential storage facility of LILW that would be constructed at the location of Čerkezovac, Trgovska Gora, the Republic of Croatia, as the currently most prominent location for the realization of the RAW storage facility. The geological characteristics of the site were analysed and, in accordance with the relevant regulations, a static design of the facility was made in the ETABS and SAFE program packages. The construction is typical reinforced concrete structure, rectangular in plan (10,0 x 30,0 m) with a height of 5,9 m. The selected location meets the given parameters of geological characteristics, while the construction meets the given load and serviceability conditions. However, a more detailed analysis would be necessary if the decision to construct such storage facility would be made.
Faculty of Mining, Geology and Petroleum Engineering
2018-02-23 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5598
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 2 (2018): No. 40
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5646
2018-04-03T18:47:39Z
rgn:MIN
"180223 2018 eng "
1849-0409
0353-4529
dc
Investigating an innovative model for dimensional sedimentary rocks characterization using acoustic frequencies analysis during drilling
Yari, Mojtaba
Isfahan University of Technology, Department of Mining Engineering
Bagherpour, Raheb
Isfahan University of Technology, Department of Mining Engineering
Determining geomechanical characteristics of rocks plays a significant role in all consequent designing stages of geosciences. On the other hand, drilling is one of the considerable operations in primer phases of extracting rocks. Drilling process produces acoustic signals as by-product during drilling. Then, one possible way for predicting geomechanical properties of rocks, is employing acoustic signal frequencies which are produced during drilling operation. This process helps to geoengineers for determining rock characteristics in short time and by low-cost and satisfying precision. This research tries to develop a novel computational relations between geomechanical characteristics of sedimentary rocks and produced dominant acoustic frequencies by implementing Fast Fourier Transform (FFT). For this purpose, a novel rotary drilling machine is developed by researchers. In order to introducing reliable model, 10 diverse sedimentary rock samples from various sedimentary basins of Iran are gathered in wide range of geomechanical features, and all tests are carried out on them. The results of this research could be used for sedimentary basins' characterization. Results show there are reliable mathematical relations between various characteristics of sedimentary rocks (UCS, TS, porosity and hardness) and diverse dominant frequencies.
Faculty of Mining, Geology and Petroleum Engineering
2018-02-23 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5646
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 2 (2018): No. 40
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5651
2018-04-03T18:47:39Z
rgn:PEE
"180223 2018 eng "
1849-0409
0353-4529
dc
Slim-tube simulation model for CO2 injection EOR
Vulin, Domagoj
Faculty of Mining, Geology and Petroleum Engineering
Gaćina, Marko
Ina d.d. http://orcid.org/0000-0001-5556-9016
Biličić, Valentina
MET Croatia energy trade d.o.o.
A simulation model of the slim-tube test has been developed to validate the laboratory experiment and used EOS as well as to investigate the possibility of serving as a fast and reliable tool for MMP determination. Sensitivity analyses were performed by testing different grid block sizes (different number of cells), changing Corey’s coefficients for relative permeability curves, varying flow rates and PVT models. Minimum miscibility pressure from the simulation model is estimated as the intersection of the two different trend line curves of oil recoveries versus the injected volume of CO2. The oil recoveries were underestimated by numerical simulation on a basic case model. This is related to the usage of single “X shaped” relative permeability curves in all simulation cases, i.e. for immiscible, near miscible and miscible conditions. In addition, by fine tuning binary interaction parameters in equation of state model and introducing different relative permeability curves for immiscible and near miscible cases, better matching of slim-tube simulation can be achieved.
Faculty of Mining, Geology and Petroleum Engineering
2018-02-23 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5651
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 2 (2018): No. 40
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5681
2018-04-03T18:47:39Z
rgn:OTH
"180223 2018 eng "
1849-0409
0353-4529
dc
Physical and chemical properties in relation with soil permeability in the area of Velika Gorica well field
Ružičić, Stanko
Kovač, Zoran
Tumara, Dražen
Hydraulic parameters affects behaviour of various ions in soils. The goal of this paper was to get better understanding of relationship between physical and chemical properties and soil permeability at the location of case study profile Velika Gorica, based on the physical and chemical data. Soil profile is situated in the Eutric Cambisol of the Zagreb aquifer, Croatia. Zagreb aquifer represents the only source of potable water for inhabitants of the City of Zagreb and Zagreb County. Based on the data obtained from particle size analysis, soil hydraulic parameters and measured water content, unsaturated hydraulic conductivity values were calculated for the estimation of soil profile permeability. Soil water retention curves and unsaturated hydraulic conductivities are very similar for all depths because soil content does not change significantly through the depth. Determination of anions and cations on soil samples was performed using the method of ion chromatography. Results showed decrease of ions concentrations after 0.6 m depth. SAR distribution in the soil profile shows that SAR values are not significantly changing at the soil profile. The highest CEC and EC values are determined in horizon Bw developed in 0.6 m depth which is consistent with highest SAR value and ions concentrations. All results suggest that physical and chemical properties of investigated profile are in relationship with soil permeability.
Faculty of Mining, Geology and Petroleum Engineering
2018-02-23 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5681
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 2 (2018): No. 40
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5704
2018-04-03T18:47:39Z
rgn:PEE
"180223 2018 eng "
1849-0409
0353-4529
dc
Steady-state heat rejection rates for a coaxial borehole heat exchanger during passive and active cooling determined with the novel step thermal response test method
Kurevija, Tomislav
Faculty of mining-geology and petroleum engineering http://orcid.org/0000-0002-5469-3653
Macenić, Marija
Faculty of mining-geology and petroleum engineering
Strpić, Kristina
Faculty of mining-geology and petroleum engineering
At three locations in Zagreb, classical and extended thermal response test (TRT) was conducted on installed coaxial heat exchangers. With classic TR test, thermogeological properties of the ground and thermal resistance of the borehole were determined at each location. It is seen that thermal conductivity of the ground varies, due to difference in geological profile of the sites. In addition, experimental research of steady-state thermal response step test (SSTRST) was carried out to determine heat rejection rates for passive and active cooling in steady state regime. Results showed that heat rejection rate is only between 8-11 W/m, which indicates that coaxial system is not suitable for passive cooling demands. Furthermore, the heat pump in passive cooling mode uses additional plate heat exchanger where there is additional temperature drop of working fluid by approximately 1,5 °C. Therefore, steady-state rejection rate for passive cooling is even lower for a real case project. Coaxial heat exchanger should be always designed for an active cooling regime with an operation of a heat pump compressor in a classical vapour compression refrigeration cycle.
Faculty of Mining, Geology and Petroleum Engineering
2018-02-23 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5704
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 2 (2018): No. 40
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5705
2018-05-29T21:00:02Z
rgn:GEO
"180601 2018 eng "
1849-0409
0353-4529
dc
Mechanisms for formation of the Mn–Fe concretions within Vijenac quarry, Dinaridic ophiolite melange
Bevandić, Srećko
Faculty of Mining, Geology and Petrolium engineering, Zagreb
Brenko, Tomislav
Faculty of Mining, Geology and Petrolium engineering, Zagreb
Babajic, Elvir
Faculty of Mining, Geology and Civil
Engineering, Tuzla
Borojević Šoštarić, Sibila
Faculty of Mining, Geology and Petrolium engineering, Zagreb
Vijenac quarry, near Tuzla in Bosnia-Herzegovina, is composed of carbonate rocks locally embedding tectonically disturbed siltite and sandstone with Mn-Fe concretions. The quarry itself represent a part of Dinaric overstep sequences (Pogari series) unconformably overlying ophiolite mélange and ophiolite trust-scheets. Petrographic, chemical and XRD analyses had shown that the concretions may be divided into two types: (i) Mn-rich concretions with ≈17% of Mn and compact texture and (ii) Mn-poor (≈8% of Mn) and porous texture. The amount of Ca, Mg, Fe and organic matter, as well as analysed microelements (Ni, Cr) in both concretion types are similar. According to petrographic and XRD analyses, concretions are composed of calcite, dolomite, hematite, todorkite and takenelite. Todorokite is characteristic for concretions formed by diagenetic growth. Petrographic study confirmed the development of concretions within three stages including two generations of calcite. The studied concretions are formed within consolidated sandstones inheriting their sedimentary textures - therefore a late diagenetic process is assumed.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5705
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5730
2018-05-29T21:00:02Z
rgn:OTH
"180701 2018 eng "
1849-0409
0353-4529
dc
Radon mapping in Croatia and its relation to geology
Mostečak, Ana
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering http://orcid.org/0000-0002-0529-2036
Perković, Dario
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
Kapor, Frankica
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
Veinović, Želimir
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
Radon is known as the main contributor to the natural background radiation exposure and mapping of different radon phenomenon presents an important task in both scientific and regulatory context. Considering the aspect of radon effects on health, identification of areas with elevated radon levels is a crucial step in radon monitoring and prevention of adverse effects on the populations and the environment. Different needs regarding the monitoring of the environmental radioactivity levels in Europe led to the initiatives such as the development of the European Atlas of Natural Radiation (EANR). To present different methods of radon mapping, European Indoor Radon Map and European Geogenic Radon Map projects are described briefly. The aim of this paper is to present the mapping of different aspects of radon (indoor and geogenic) and its importance in data visualization and information dissemination. The practical experiences worldwide provide context for future activities of radon mapping in Croatia. Existing Croatian initiatives in the field of radon risk research are mostly related to the investigations of indoor radon concentrations and identification of radon prone areas through one national study and several focused studies. Comparison of indoor radon levels in Croatia and several geological parameters identified new areas appropriate for future research that could lead towards a geogenic map of radon potential in Croatia.
Keywords: radon mapping, geology, Croatia, GIS, natural radioactivity.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5730
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/5781
2018-04-03T18:47:39Z
rgn:MIN
"180223 2018 eng "
1849-0409
0353-4529
dc
The optimization of technological mining parameters in quarry for dimension stone blocks quality improvement based on photogrammetric techniques of measurement
Levytskyi, Volodymyr
Zhytomyr State Technological University http://orcid.org/0000-0002-3892-5848
Sobolevskyi, Ruslan
Zhytomyr State Technological University
Korobiichuk, Valentyn
Zhytomyr State Technological University
Research focuses on patterns of change in the dimension stone commodity blocks quality production at a previous identification and measurement of natural cracks geometrical parameters, modelling and planning out the final dimension stone products and finished products based on the proposed digital photogrammetric techniques. Optimal parameters of surveying are investigated and influence of surveying distance to length and cracks area determination accuracy is estimated. Rational technological parameters of dimension stone blocks production are considered.
Faculty of Mining, Geology and Petroleum Engineering
2018-02-23 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/5781
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 2 (2018): No. 40
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6007
2017-12-18T16:24:35Z
rgn:OTH
"171216 2017 eng "
1849-0409
0353-4529
dc
Lava tube Leiðarendi
Bedeković, Gordan
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
There is not abstract.
Faculty of Mining, Geology and Petroleum Engineering
2017-12-16 19:38:17
Other papers, book review, commentaries etc.
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6007
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 1 (2018): No. 39
eng
Copyright (c) 2017 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6008
2018-05-29T21:00:02Z
rgn:GEO
"180301 2018 eng "
1849-0409
0353-4529
dc
High flows from Gornja Dobra basin
Pavlić, Krešimir
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, p.p. 390, 10000 Zagreb http://rgn.hr/~kpavlic/ http://orcid.org/0000-0003-3315-2900
Jakobović, Daniel
HIS d.o.o. Donja Višnjica 61D, 42255 Donja Višnjica
The paper presents basic hydrological indicators based on data from the four existing hydrological stations on the Gornja Dobra basin. The frequency and flow-duration curves of mean daily flow in Turkovići profile are also defined and presented. The dependence of the mean maximum annual specific flows on the size of the influential basin to the considered hydrological profiles was considered. A review of a most recent high water event in 2017 was given.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6008
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6098
2018-05-29T21:00:02Z
rgn:GEO
"180301 2018 eng "
1849-0409
0353-4529
dc
Review of the latest research on coal, environment, and clean technologies
Medunić, Gordana
University of Zagreb http://www.pmf.unizg.hr/geol/gordana.medunic
Mondol, Deepti
Ewing Christian College
Rađenović, Ankica
University of Zagreb
Nazir, Sadhana
Pandu College
Fossil fuels, coal in particular, are indispensable sources of energy necessary for today's technological and economical progress throughout the world. Their burning releases numerous environmental contaminants, like CO2, SO2, and a range of organic and inorganic compounds. Arguably, however, and despite the fact that these emissions have resulted in air pollution and regional acid rain problems, there is no evidence yet of their usage completely replaced by a low-CO2–producing energy source. Coal, due to its unique composition and characteristics, has been actively investigated by scientists and technologists from various disciplines in a search for economically valuable metals and medically active substances. Also, coal is used universally for the fabrication of new nanomaterials in laboratories, and utilized in waste-treatment and clean-coal technologies. The aim of the paper was to focus on the latest advancements in coal research of leading international scientists from India, China, and USA. Also, the paper is briefly presenting selected papers of several Indian and Croatian research groups addressing environmental issues and emerging waste-treatment technologies. Although the two countries are different from the geographical, historical, economical, and industrial point of view, the both have been linked with the coal extraction and its usage in power generation and associated heavy industries.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6098
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6147
2018-05-29T21:00:02Z
rgn:GEO
"180301 2018 eng "
1849-0409
0353-4529
dc
Physical and mechanical properties of dolomites related to sedimentary and diagenetic features – case study of the Upper Triassic dolomites from Medvednica and Samobor Mts., NW Croatia
Maričić, Ana
Faculty of Mining, Geology and Petroleum Engineering
Starčević, Karlo
Barudžija, Uroš
Faculty of Mining, Geology and Petroleum Engineering
Sedimentary and diagenetic features of Upper Triassic dolomites are determined and related to technical properties (apparent density, water absorption, open porosity and point load strength tested by Point Load Test, PLT) for possible use as building aggregate. Samples are taken from three quarries in the Medvednica and Samobor Mts., in the NW Croatia. Samples from the Ivanec Quarry are determined as the early-diagenetic dolomite (EDD), late-diagenetic dolomite (LDD) and “transitional” dolomite (TD). Samples from the Dolje Quarry are determined as the early-diagenetic dolomite (EDD) and late-diagenetic dolomite (LDD). The samples from the Gradna Quarry are determined as the late-diagenetic dolomites (LDD). According to the physical and mechanical properties, the best variety to use as a crushed stone or as an aggregate proved to be is the late-diagenetic dolomite from the Dolje Quarry. Samples from the Dolje Quarry have the lowest values of open porosity and water absorption and the highest values of apparent density and PLT, due to their sedimentary-diagenetic features.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6147
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6261
2018-05-29T21:00:02Z
rgn:GEO
"180301 2018 eng "
1849-0409
0353-4529
dc
Selenium and heavy metal levels in vegetables and tissues of three non-migratory birds exposed to soil, water, and aquatic sediment contaminated with seleniferous Raša coal
Medunić, Gordana
UNIZG http://www.pmf.unizg.hr/geol/gordana.medunic
Kuharić, Željka
Fiket, Željka
Bajramović, Mladen
Singh, Asha Lata
Krivohlavek, Adela
Kniewald, Goran
Dujmović, Lucija
Coal mining and coal combustion release environmental contaminants which stay at emission sites for many decades. The paper reports total Se and heavy metals (As, Cd, Cu, Cr, Hg, Pb, Sr, U, V, and Zn) in lettuce, potato, and tissues (liver, kidney, heart, and muscle) of three non-migratory bird species (pigeon, jay, and black coot) from a Raša Bay area (North Adriatic, Croatia). They have presumably been exposed to elevated Se and metal levels in garden soil, surface water, and aquatic sediment contaminated with superhigh-organic-sulphur (SHOS) Raša coal, highly enriched in S, Se, V, and U. Results point at selenium contamination of stream water (up to 78 µg/L total Se in a non-filtered sample), which is well above the Croatian regulatory threshold of 10 µg/L total Se. The stream drains a site of the former coal-separation unit, and an associated bottom sediment contains up to 10.8 mg/kg total Se, which is also above the safe level of 0.60 mg/kg total Se. Moreover, values of Mo, U, V, and Sr, elements commonly elevated in SHOS coal varieties, were also increased in majority of water samples as well as in analysed vegetables, soil, and aquatic sediments. Although Cu, Zn, Pb, and V were slightly increased in liver samples of birds, more in black coot than the other two birds, selenium values were found to be adequate for their normal growth. The fact that Se can be environmentally hazardous and toxic to life, even in small doses, warrants further research on this topic.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6261
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6263
2018-05-29T21:00:02Z
rgn:MIN
"180601 2018 eng "
1849-0409
0353-4529
dc
Research of bauxite deposits from underground mining works
Budeš, Ivan
Rudnici boksita Jajce
Galić, Ivo
Dragičević, Ivan
The paper presents a new approach to exploring bauxite deposits from underground mining works in the bauxites area of Bešpelj near Jajce in Bosnia and Herzegovina. In the area considered, bauxite deposits are being investigated and exploited over 60 years. Despite the high degree of exploration in the geologically intricate structures of Bešpelj there are numerous up to the unexplored reservoirs. Up to now, they have been mainly investigated by drilling from the surface into the wells net to dictate the legal regulations. Due to the increase in depths on which deposits are located and complex structural relationships, such research has become more and less effective. From the geological point of view, the bauxite deposits are in the horizontal position. But long-lasting geological evolution from the upper Cretaceous to the present, has led to deposits in very different structural positions. That is why we find them in a tilted position, in subvertical and vertical, and often in an inverse position. For further research to become rational and efficient, a new approach to exploring basement from underground mining works will be developed that will serve for exploration and then for the exploitation of bauxite deposits.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6263
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6296
2018-05-29T21:00:02Z
rgn:MIN
"180301 2018 eng "
1849-0409
0353-4529
dc
Dependency of Specific Energy of Rock Cutting on Specific Drilling Energy
Antoljak, Davor
Kuhinek, Dalibor
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, assistant professor
Korman, Tomislav
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, assistant professor
Kujundžić, Trpimir
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, full professor
Specific energy is the measure which connects the operating parameters of the machine with the characteristics of the rock in which the machine works and is equal to the total work required to break a unit volume of the rock. It is assumed that in machines with the same or similar rock breaking mechanics used for different purposes (e.g. cutting and drilling of rocks), there is a significant dependence on their specific energy values. In the exploitation of dimension stone a chain saw and a rotary drill are often used, i.e. the machines for rock cutting or rock drilling whereas their mechanics of rock breaking is very similar. In order to determine dependence of the specific energy of rock cutting on the specific drilling energy, preliminary laboratory tests were carried out on a linear cutting machine and a laboratory drill with simulated cutting of rocks with a chain saw, and drilling by rotary drilling. The analysis of the measurement results has provided the guidelines for the continuation of laboratory testing, i.e. field testing.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6296
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6433
2018-05-29T21:00:02Z
rgn:PEE
"180601 2018 eng "
1849-0409
0353-4529
dc
Pressure build-up test analysis of the reservoir system with the multiphase flow
Koščak Kolin, Sonja
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering http://orcid.org/0000-0003-0056-4466
Kurevija, Tomislav
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering http://orcid.org/0000-0002-5469-3653
Grebenar, Dominik
Faculty of Mining, Geology and Petroleum Engineering
The present work focuses on the determination of absolute permeability in an oil reservoir whose pressure is under the bubble point. The simulation of the reservoir and well with the simultaneous flow of oil and gas is performed using the Eclipse100 software. The main purpose of the simulation is to obtain pressure build-up tests for two reservoir systems, as the well testing technology requires the shut-in period, which increases the costs of the real well production cycle. In the first simulation it is presumed that the well is not damaged, having the skin effect equal to zero, while in the second one, the skin effect of the well in the same reservoir is 9,44. The aim is to compare the results of the pressure build-up test analysis for both cases. In each case, permeability is firstly calculated using four methods, given by different authors. The theoretical background and the process of obtaining the required results are given for each approach. Results are compared with the permeability as determined by the pressure transient analysis, using the Saphir software, for both the ideal and the damaged well. Differences in results are presented and discussed. Conclusions can be applied to real reservoir systems with the multiphase fluid flow in the porous media.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6433
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6496
2018-05-29T21:00:02Z
rgn:GEO
"180427 2018 eng "
1849-0409
0353-4529
dc
Hydrochemical characteristics of the groundwaters in Prilep’s part of Pelagonia valley – Republic of Macedonia
Mircovski, Vojo
University "Goce Delcev" - Stip
Gicevski, Biljana
Dimov, Gorgi
This paper presents the results of hydrochemical investigations of groundwater from the Prilep part of the Pelagonia valley - Republic of Macedonia. These investigations were carried out by analyzing 12 samples of groundwater, taken from the exploitation wells. Samples are taken once a season, during August 2013. Values of the pH were determined with the field digital pH meter, while cations are determined by inductively coupled plasma-atomic emission spectrometry (ICP – AES). For the determination of the anions are used standard EPA methods (gravimetric - TDS, volumetric - Cl-, spectrophotometric - NO3-, NO2-, NH4+ and turbidimetric - SO42- with the spectrophotometer 6715 UV / VIS, Jenway). Тhe maps with spatial distribution of the hydrochemical components were prepared using the IDW (Inwerse Distance Weighting) method for map generation (Geographic Information System software (GIS) ESRI® ArcGis™ 9.2 and its extension Geostatistical Analyst). Spatial distribution maps were constructed according to the coordinates and sample content of each analyzed sample. Samples were taken from the wells which are divided into 3 groups: wells with free level with depth up to 10 m, wells with free level with depth up to 100 m and artesian wells. The graphical methods, Piper diagram and Chadha’s diagram, were applied in order to determine the hydrochemical properties of the groundwater. The results indicate that the groundwater samples have different hydrochemical properties. Ca 2+ >Na+>Mg2+ for the cations and HCO3- >Cl- >SO42- for the anions were dominantly dissolved ions in the majority of the water samples. Generally, increased values of Ca2+, Mg2+, Na+, K+, HCO3-, K+ and Cl- occur in the groundwater from deeper artesian wells, as a result of the longer retention time of water in the underground and its interaction with the geological environment. Dominant groundwater in Prilep field, in all three types of wells, are waters from hydrocarbonate class (HCO3¯), calcium group (Ca), the first type of water. Groundwater from the shallow wells show the increasing content of K+, NO3- and PO43-which indicates water pollution from fertilization of the cultivated areas, livestock farms as well as communal wastewater. Although hydrochemical data are obtained on the basis of water samples taken only once, they provide an indicative insight into the hydrochemical composition of the water. To obtain more reliable data, taking groundwater samples from wells should be performed multiple times in different seasons.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6496
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6497
2018-05-29T21:00:02Z
rgn:MPS
"180601 2018 eng "
1849-0409
0353-4529
dc
Night sky brightness above Zagreb 2012.-2017.
Andreic, Željko
University of Zagreb
The night sky brightness at the RGN site (near the centre of Zagreb, Croatia) was monitored form January 2012. to December 2017. The gathered data show that the average night sky brightness in this period did not change significantly, apart from differences caused by yearly variations in meteorological parameters. The nightly minima, maxima and mean values of the sky brightness do change considerably due to changes in meteorological conditions, often being between 2 and 3 magnitudes. The seasonal probability curves and histograms are constructed and are used to obtain additional information on the light pollution at the RGN site. They reveal that the night sky brightness clutters around two peaks, at about 15.0 mag/arcsec2 and at about 18.2 mag/arcsec2. The tendency to slightly lower brightness values in spring and summer can also be seen in the data. Two peaks correspond to cloudy and clear nights respectively, the difference in brightness between them being about 3 magnitudes. A crude clear/cloudy criterion can be defined too: the minimum between two peaks is around 16.7 mag/arcsec2. The brightness values smaller than thisare attributed to clear nights and vice-versa. Comparison with Vienna and Hong-Kong indicates that the light pollution of Zagreb is a few times larger.
Faculty of Mining, Geology and Petroleum Engineering
2018-05-29 00:00:00
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6497
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 3 (2018): No. 41
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6516
2018-09-07T14:49:03Z
rgn:PEE
"180706 2018 eng "
1849-0409
0353-4529
dc
Contribution to the methodology of determining the optimum mud density - a case study from the offshore gas condensate field D in the Persian Gulf
Zadravec, Damir
Krištafor, Zdenko
University of Zagreb
Faculty of Minig, Geology and PEtroleum Engineering
Drilling the wells using water based mud through shale formations, causes their exposure to serious time-dependent wellbore instability due to shale swelling. Operating companies, before drilling operations through demanding shale formations, usually conduct drilling fluid optimization studies in order to define the proper mud type, mud density, salt type and concentration for inhibition. Through the analysis of offset wells, they are interpreting data about mud filtrate breakouts into the rock formations and chemical potential mechanisms to understand their influence on the time-de- pendent wellbore instability. The main objective of this paper is to give an insight in time-dependent and mechanical wellbore instability problems faced while drilling the wells through different shale formations in the gas condensate field D in the Persian Gulf. The importance of drilling fluid design optimization and solutions applied to overcome hole in- stability problems were analysed and highlighted. Besides the development of a model for mud density calculations, a concept of effective hoop stress and its influence on time dependent failure mechanisms is discussed. As a contribution to the method improvement, mud density calculation is verified by taking into the consideration the relationship be- tween pore pressure and effective hoop stress and it is based on measured data from Well A in gas condensate field D from the Persian Gulf.
Faculty of Mining, Geology and Petroleum Engineering
2018-09-07 16:49:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6516
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 4 (2018): No. 42
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6544
2018-09-07T14:49:03Z
rgn:GEO
"180430 2018 eng "
1849-0409
0353-4529
dc
Middle Miocene drowned ramp in the vicinity of Marija Bistrica (Northern Croatia)
Sremac, Jasenka
University of Zagreb, Faculty of Science http://geol.pmf.hr/~jsremac/ http://orcid.org/0000-0002-4736-7497
Tripalo, Kristina
University of Zagreb, Faculty of Science
Repac, Marko
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering
Bošnjak, Marija
Croatian Natural History Museum
Vrsaljko, Davor
Croatian Natural History Museum
Marjanac, Tihomir
University of Zagreb, Faculty of Science
Moro, Alan
University of Zagreb, Faculty of Science
Lužar-Oberiter, Borna
University of Zagreb, Faculty of Science
Fio Firi, Karmen
University of Zagreb, Faculty of Science
Aščić, Šimun
University of Zagreb, Faculty of Science
Fossiliferous Middle Miocene deposits from the surroundings of Marija Bistrica (north-east of Zagreb) transgressively overly older pre-Cenozoic bedrocks. Fossils from shallow marine environments are in most cases preserved as bioclasts, while deep marine calcareous oozes characterize the pelagic marls. The age of the transgressive sequence is estimated on the basis of planktic biota from marls (foraminifera, nannoplankton and pteropods) as the Badenian NN5 Nannozone. The following palaeoenvironments can be distinguished or presumed on the basis of biota and sedimentary features: (1) beach characterized by polymictic conglomerates with rhodolith-rich carbonate matrix; (2) oyster banks, recognized from secondarily found oyster clusters; (3) lagoons marked with compact bioclastic deposits and rhodolith-halimeda assemblage; (4) patch-reefs recognized from the surrounding bioclastic deposits; (5) shallow subtidal mäerl beds preserved as loose bioclastic deposits and (6) distal slope argillaceous marls with pelagic biota. Palaeoenvironmental analyses indicate rapid drowning, most probably corresponding to the transgression during the Middle Badenian TB 2.4 3rd order transgressive-regressive sequence.
Faculty of Mining, Geology and Petroleum Engineering
2018-09-07 16:49:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6544
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 4 (2018): No. 42
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6555
2018-09-07T14:49:03Z
rgn:MIN
"180427 2018 eng "
1849-0409
0353-4529
dc
Evaluation of the effectiveness of natural stone surface treatment from Ukraine by mechanical and chemical methods
Levytskyi, Volodymyr
Zhytomyr State Technological University http://orcid.org/0000-0002-3892-5848
Korobiichuk, Valentyn
Zhytomyr State Technological University http://orcid.org/0000-0002-1576-4025
Shamrai, Volodymyr
Zhytomyr State Technological University http://orcid.org/0000-0001-9441-9379
Sobolevskyi, Ruslan
Zhytomyr State Technological University http://orcid.org/0000-0001-7489-8851
Sydorov, Oleksandr
Zhytomyr State Technological University http://orcid.org/0000-0003-4546-3570
Studies have been conducted with the aim of studying ways to improve the decorative properties of natural stone products. That will allow to make finished product run of natural stone with a homogeneous tint. For this purpose, the indicators of luster, lightness and saturation of natural surfaces of facing stone worked by mechanical and chemical methods are described. The influence of chemical treatment on the decorative indicators of various kinds of natural facing stone depending on its mineralogical composition is determined.
Faculty of Mining, Geology and Petroleum Engineering
2018-09-07 16:49:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6555
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 4 (2018): No. 42
eng
Copyright (c) 2018 Rudarsko-geološko-naftni zbornik
oai:ojs.pkp.sfu.ca:article/6701
2018-09-07T14:49:03Z
rgn:GEO
"180517 2018 eng "
1849-0409
0353-4529
dc
Microfacies characteristics of carbonate cobble from Campanian of Slovenj Gradec (Slovenia): implications for determining the Fleuryana adriatica De Castro, Drobne and Gušić paleoniche and extending the biostratigraphic range in the Tethyan realm
Moro, Alan
Faculty of Science
Velić, Ivo
Croatian geological summer school
Mikuž, Vasja
University of Ljubljana, Department of Geology
Horvat, Aleksander
Research Centre of the Slovenian Academy of Sciences and Arts
A carbonate cobble was collected in a creek near Slovenj Gradec (Slovenia). It comprises Trochactaeon gastropods as well as foraminifera Fleuryana adriatica and Cuneolina ketini from a subtidal environment with agglutinated and porcelaneous benthic foraminifera. Packstone-grainstone of the structural type contains the abovementioned foraminiferal taxa, which are previously undetermined in this part of the Upper Cretaceous Tethyan realm. Stratigraphic data from this area, together with the determined microfossil assemblage of the carbonate cobble, indicate the upper part of Lower Campanian age, implying an extension of the F. adriatica and C. ketini stratigraphic range. The paleoniche within the Tethyan realm in which F. adriatica thrive is the shallowest part of the subtidal, close to peritidal conditions. It was developed on a relatively harder substrate that resulted from a laterally more pronounced paleorelief which enabled the shifting of hyaline benthic foraminifers towards the shallowest part of the subtidal. Their paleoniche is laterally absent from protected paleoenvironments with soft muddy substrate and a relatively high carbonate sedimentation rate, colonized with elevator rudists, as well as from relatively higher water energy paleoenvironments with completely hard grainstone-rudstone substrate.
Faculty of Mining, Geology and Petroleum Engineering
2018-09-07 16:49:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6701
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 4 (2018): No. 42
eng
Copyright (c) 2018 authors and journal
oai:ojs.pkp.sfu.ca:article/6702
2018-09-07T14:49:03Z
rgn:MIN
"180511 2018 eng "
1849-0409
0353-4529
dc
Reducing the adverse effects of blasting on the cave ecosystem near the future exploitation field Gradusa
Mesec, Josip
University of Zagreb, Geotechnical Faculty in Varaždin
Težak, Denis
Jug, Jasmin
The future exploitation field of technical-construction stone Gradusa is located in the area of Sunja municipality in Sisak-Moslavina County. Near Gradusa there is a cave that is part of the ecological network as a conservation area important for several species and habitat types of bats. The significance of the cave is also its location in the continental part of Croatia where it is among a small number of objects that bats can use in all periods of their annual cycle. Due to the location and importance of habitats, there was a need to define the primary environmental impacts assessment for the ecological network. This assessment is the most important document for the possible acquiring of a location permit for exploitation from the future quarry of Gradusa. This paper presents the results of trial blasting and guidelines for reducing the adverse blasting effects on the cave ecosystem near future exploitation field Gradusa. These are vibrations and noise, which may have an adverse impact on the habitats of bats. Cavers and experts on bats have also been included in the process of selecting the micro-location.
Faculty of Mining, Geology and Petroleum Engineering
2018-09-07 16:49:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6702
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 4 (2018): No. 42
eng
Copyright (c) 2018 authors and journal
oai:ojs.pkp.sfu.ca:article/6776
2018-09-07T14:49:03Z
rgn:GEO
"180605 2018 eng "
1849-0409
0353-4529
dc
Identification of groundwater level decline in Zagreb and Samobor-Zaprešić aquifers since the sixties of the twentieth century
Vujević, Mate
Hrvatske vode
Posavec, Kristijan
This study examines historically measured groundwater levels on observation wells of Zagreb and Samobor-Zaprešić aquifers since the 70-ies of the 20th century until today. The analysis also entails older groundwater level maps dating from the 60-ies of the previous century, which offer additional insights into the historical groundwater levels. The analysis of the existing groundwater levels and historical groundwater levels has identified changes of those levels in certain areas of the aquifer, special reference being taken to developments which, with time, led to deceleration of negative trends of groundwater levels in certain parts of the aquifer. The most significant such developments in the past 50 years or so are the construction of the weir of the Zagreb cogeneration plant (TE-TO) in the Sava river and occurrence of hydrologically above-average favourable years like 2013/2014, which have been separately analysed. The analysis has found that today's groundwater levels in Zagreb and Samobor-Zaprešić aquifers are generally lower by approximately 3 to 6 m in comparison with the historical levels from the 60-ies of the last century.
Faculty of Mining, Geology and Petroleum Engineering
2018-09-07 16:49:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6776
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 4 (2018): No. 42
eng
Copyright (c) 2018 authors and journal
oai:ojs.pkp.sfu.ca:article/6781
2018-09-09T08:58:02Z
rgn:MIN
"180703 2018 eng "
1849-0409
0353-4529
dc
An investigation of the effect of toughness and brittleness indexes on ampere consumption and wear rate of a circular diamond saw
Akhyani, Masoud
Sereshki, Farhang
Mikaeil, Reza
Department of Mining and Metallurgical Engineering, Urmia University of Technology
The circular diamond saw (CDS) is one of the major sawing machines in dimension stone processing plants. Predicting the performance of a circular diamond saw is very important to estimate the cost and the planning of the stone process- ing plants. The performance of a CDS depends on some important factors such as machine and tool characteristics, physical and mechanical characteristics of rock and tool wear rate. In this research, it is aimed to investigate the relation- ship between ampere consumption, brittleness indexes and toughness with the wear rate of a CDS. This aim was pursued by using a fully instrumented cutting rig to cut 14 types of hard rock at constant feed rates, cut depths and peripheral speeds. Wear rate, toughness and brittleness indexes were evaluated using simple and multiple curvilinear regression analysis and predicted models were developed. The results indicated that there is a significant correlation between wear rate, ampere consumption and toughness. It is concluded that, the wear rate of a CDS can be reliably estimated using a multiple curvilinear model which includes ampere consumption and toughness.
Faculty of Mining, Geology and Petroleum Engineering
2018-09-07 16:49:03
application/pdf
https://hrcak.srce.hr/ojs/index.php/rgn/article/view/6781
Rudarsko-geološko-naftni zbornik; Vol. 33 No. 4 (2018): No. 42
eng
Copyright (c) 2018 authors and journal
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