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Упит dcterms_subject_txt:In Pit Crushing and Conveying

2182 items

  • A Knowledge-Based Approach to Mine Ventilation Planning in Yugoslav Mining Practice

    Nikola Lilić, Ivan Obradović, Ranka Stanković (2002)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper, we ...
    ... main fan is 1271.3 Pa and the total air flow volume is 42.4 m3/s. The workings in the pit are ventilated auxiliary, in a compression mode, with the use of axial fans of the APXE-630 type. In order to assess the overall mine ventilation system state of the “Soko” mine the following measurements were ...
    ... considerable air loss in the system, which influences the effective utilization of the overall air stream, used for the ventilation of the pit. Total air loss in the ventilation system is very high, reaching 19.6 m3/s or 46.25% of the total air quantity used for pit ventilation (Figs. 10 and 11). The air ...
    ... analysis of air flow and pressure distribution in the ventilation network, (ii) a block for the analysis of climate conditions in mine workings, (iii) a block for temperature and heat depression analysis in fire incidence condi- tions, and (iv) a block for gas distribution analysis in the ventilation ...

  • Analiza pouzdanosti dozera angažovanih na površinskim kopovima RB Kolubara

    Filip Miletić, Dragan Milčić, Miloš Tanasijević, Miloš Milovančević (2021)
    U radu je izvršena uporedna analiza pouzdanosti transportnih sistema dozera koji rade na površinskim kopovima Rudarskog basena Kolubara. Period za koji je vršena analiza je prvih deset godina eksploatacije. Efikasnost tehnološkog procesa na otkopavanju korisne mineralne sirovine i otkrivke u velikoj meri zavisi od rada dozera. Iskorišćene su matematičke metode za aproksimaciju i identifikaciju zabeleženih vremena u radu, kako bi se dobili analitički pokazatelji pouzdanosti. Na ovaj način se bitno podiže kvalitet upravljanja procesom eksploatacije i održavanja mašina na ...
    dozeri, pouzdanost, kolubarski ugljeni basen
    ... open pit mines of the Kolubara Mining Basin. Analysis period is first ten years of exploitation. Efficiency of process on excavation of mineral raw material and overburden largely depends of dozers work. The paper uses mathematical methods for approximation and identification of working times in order ...
    ... order to obtain analytical reliability indicators. In this way, the quality management of the exploatation and maintenance process is significantly raised. Keywords: dozers, reliability, kolubara mining basin 1. Uvod Rudarska industrija predstavlja važnu privrednu granu. Poslednjih godina proizvodnja svih ...
    ... okruženju Microsoft Excel, Infoteh–Jahorina Vol. 10, Ref. C-8, p. 273-277, Mart 2011; [8] Ashish S., Muni S. Regression analysis - Theory, Methods, and Applications, Springer-Verlag New York, 1990.; [9] Milčić D. Pouzdanost mašinskih sistema, Univerzitet u Nišu, Mašinski fakultet, 2005. [10] Milčić D ...

  • Pregled hidrodinamičkih istraživanja bunara sa horizontalnim drenovima numeričkim metodama

    Đorđije Božović, Dušan Polomčić, Dragoljub Bajić (2020)
    U radu je predstavljen pregled odabranih hidrodinamičkih istraživanja realizovanih primenom numeričkih metoda simulacije kretanja podzemnih voda pod uticajem rada bunara sa horizontalnim drenovima. Na osnovu pristupa u matematičkom i hidrauličkom tretiranju, kao i numeričkoj simulaciji bunara sa horizontalnim drenovima na modelima, predstavljeni su najznačajniji aspekti izrade hidrodinamičkih modela ovog kompleksnog tipa vodozahvatnog objekta. Metodologija obuhvata izbor: a) graničnih uslova za simulaciju prirodnih granica, izvora prihranjivanja i dreniranja izdani; b) primenjivanog stepena diskretizacije prostora obuhvaćenog modelom u planu i profilu; ...
    horizontalni bunari, hidraulika bunara, analitički modeli, numerički modeli, hidrodinamičko modeliranje podzemnih voda

  • A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers

    Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić (2019)
    Effectiveness evaluation is one of the basic components of engineering asset management and maintenance engineering in general. Effectiveness is an overall concept representing a measurement of quality of service level for the analyzed engineering system. This concept contains a series of partial indicators relating to time in operation and time for maintenance activities, as well as functional properties of the system. This article describes the analysis and structuring of partial indicators, as well as the development of a model ...
    Efikasnost, Fazi zaključivanje, Prikupljanje podataka, Buldozer

  • Merenje mase iskopanog uglja na površinskim kopovima

    Snežana Aleksandrović (2015)

  • Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić (2024)
    The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...
    optimizacija, 3D model, bušenje, miniranje, O-Pitblast, softver

  • Funkcionisanje i uticaj epikarsta na režim, bilans i kvalitet podzemnih voda istočnog dela karstnog sistema Suve planine

    Branislav Z. Petrović (2020)
    Epikarst je deo karstne izdani koji se nalazi u okviru nadizdanske zone i predstavlja kompleksnu tačku dodira i mešanja nekonsolidovanog materijala sa površine terena, ostataka karbonatnih stena izmenjenih korozivnim delovanjem vode, živog sveta i njihovih ostataka, koja je delimično zasićena podzemnom vodom. Kompletan sud o stepenu razvoja i prisustva epikarsta na nekom krečnjačkom terenu moguće je doneti uz multidisciplinarna i obavezna detaljna hidrogeološka istraživanja. Poligon za sprovedena istraživanja je bio karstni masiv Suve planine, koja u geološkom i geografskom smislu ...
    epikarst, karstni sistem, podzemne vode, procesi samoprečišćavanja, hidrohemijski i mikrobiološki procesi u podzemnoj vodi

  • Споменица 1991. – 2015. година: 135 година геологије и 70 година рударства на Универзитету у Београду

    главни и одговорни уредник Душан Поломчић (2016)
    Рударско-геолошки факултет
    ... STANIC R., HAMOVIC J., 2003: Simulation of In-Pit Crushing Systems Using AutoMod. 19th World Mining Congress, Mining in the 21st Century: Quo Vadis?. KOLONJA B., IGNJATOVIĆ D., KNEŽEVIĆ D., 2005: System for the coal quality control on "Tamnava" lignite open pit mines. 6th European Coal Conference, Belgrade ...
    ... Mineralogy and characterization of deposited particles of the aero sediments collected in the vicinity of power plants and the open pit coal mine: Kolubara (Serbia), Environmental Science and Pollution Research, 2013. 221. Foley S., Prelević D., Rehfeldt T., Jacob D.: Minor and trace elements in olivines ...
    ... particles in the coal dust and fly ash of the Kolubara basin (Serbia). Periodico di Mineralogia, 81(2), 205-223. CVETKOVIC Z., LOGAR M., ROSIC A., 2013: Mineralogy and characterization of deposited particles of the aero sediments collected in the vicinity of power plants and the open pit coal mine: ...

  • Testing the energy value of different types of coal by the method of active thermography

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Predrag Jovančić, Dragutin Jovković (2020)
    In this paper, coal thermograms are presented and analyzed in order to determine their energy value. Two types of coal of different categories, brown and lignite, were selected for active thermographic imaging. The tested coal samples were processed before measurement so that they are similar in dimensions and have two plane-parallel smooth surfaces. The test samples were "primarily" heated under the same conditions and the process of their cooling was monitored by a thermal camera. "Then" they were cooled ...
    Infrared imaging, nondestructive testing, active thermography, coal.

  • Primena digitalne fotogrametrije u rudniku Rudnik

    Nikola Mirković, Luka Crnogorac, Katarina Urošević (2023)
    Digitalna fotogrametrija, lasersko skeniranje i virtuelizacija sve više pronalaze aktivne uloge u rudarstvu, prvenstveno zbog svoje široke mogućnosti primene. Laserskim skeniranjem i fotogrametrijom snimaju se i kreiraju 3D modeli otkopa, jamskih hodnika, površinskih kopova, površinskih objekata (zgrada, spomenika, predmeta), a vrši se skeniranje celih rudnika koji se rekonstruišu u 3D digitalne modele. Fotogrametrija predstavlja proces fotografisanja objekata pomoću fotoaparata i daljom obradom fotografija u različitim softverskim alatima kreiraju se realne kopije 3D modela objekata ili predmeta u digitalnoj formi. Za ...
    digitalna fotogrametrija, prostorna vizuelizacija, rudarski objekti, podzemna eksploatacija
    ... Digital photogrammetry, laser scanning and virtualization are increasingly finding active roles in mining, primarily due to their wide application possibilities. With laser scanning and photogrammetry, 3D models of excavations, underground roadways, open-pit mines, surface objects (buildings, monuments ...
    ... photographed and created, and whole mines are scanned and reconstructed into 3D digital models. Photography is the process of photographing objects using a camera and by further processing the photos in various software tools, realistic copies of 3D models of objects or tools are created in digital form ...
    ... level for the needs of geological mapping in the mine, insight of management and engineers into the state of underground spaces and quality assessment of performed mining works. In addition to the above, the developed 3D models of underground spaces and mechanization can be used for educational ...

  • Оптимизација управљања процесима рекултивације површинских копова угља

    Bojan S. Dimitrijević (2014-05-30)
    Ширење површинске експлоатације минералних сировина а нарочито енергетских ресурсафосилних горива, чине површинске копове угља просторно доминантним објектима великих рударскихбасена како у нас тако и у свету. Експлоатациона активност, прати негативне еколошке утицаје наживотну средину шире околине, што нас обавезује на интегрално планирање, ревитализацију,рекултивацију и уређење нарушеног простора за његово поновно хумано коришћење упостексплоатационом периоду. Постексплоатационо санирање и уређење предела површинских коповаи одлагалишта односно нарушеног простора изазваног рударским радовима и пратећих објеката,представља синтетички мултидисциплинарно-интердисциплинаран веома комплексан вишефазниинжењерски пројектни задатак.У уводном ...
    рекултивација, постексплоатациони предео, површински коп угља,вишеатрибутна анализа, одлучивање, процеси, рекултивационо решење
    ... influences in a wider area, committing us to the integral planning, revitalization, land reclamation and spatial arrangement of the downgraded areas for the human use in the post-mining period. The post-mining remediation and spatial arrangement of open pit mine areas and waste dumps, or, in other words ...
    ... PROMETHEE, serving in the closing section of the thesis for test experimental research performed in three subject in our country and the region: 1. Open pit mine Klenovik - Kostolac Coal Mining Basin, 2. Tamnava West Field - Kolubara Coal Mining Basin in Serbia as well as 3. Open pit mine Bogutovo Selo ...
    ... of 20 alternative variations for each open pit mine separately, by using analogy in selecting the criteria. For the purpose of design solutions, i.e. the selected open pit mines as the research objects, PROMETHEE model was chosen. Without further analysis and the assessment of the multi-attribute models ...

  • Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije

    Jelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar (2023)
    Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...
    mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacija

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria

    Vladimir Krivošić, Luka Crnogorac, Rade Tokalić (2024)
    The choice of adequate mining machines is one of the most complex problems in the underground exploitation of mineral raw materials. The weight of such a decision is reflected in the high prices of these machines and the occurrence of even greater costs during their use if their choice was wrongly conceived. There are numerous examples from practice in which such decisions were made solely on the basis of comparing the prices of machines, without considering any of the ...
    utovarno-transportna mehanizacija, izbor, TOPSIS, entropija, standardna devijacija, težina kriterijuma

  • Анализа утицаја искоришћења у преради на резултате оптимизације површинских копова

    Стефан Митић (2024)
    Одређивање оптималних граница површинског копа је сложен и итеративни процес који захтева мултидисциплинарну експертизу, софистициране технике анализе и пажљиво разматрање геолошких, рударских, економских,техничких, еколошких и друштвених фактора. Оптимизација подразумева генерисање серије шкољки, површинског копа на основу различитих фактора прихода (Revenue factor) са итеративним кораком промене цене метала у односу на базну цену. Свака генерисана шкољка представља инкрементално повећање запремине резерви према инкременталном повећању продајне цене метала. Велики број техно -економских фактора утиче на овај процес, и промена сваког од њих ...
    оптимизација површинског копа, анализа границе копа, оптимална контура копа, лежиште Бувач, профит, искоришћење у преради, трошкови прераде руде
    ... Schofield D., 1993. Open Pit Design and Scheduling by use of Genetic Algorithms. Nottingham, Symposium on Artificial Intelligence in the Minerals Sector. 8. Githiria J., 2016. Cut-off grade optimisation to maximise the net present value using whittle 4X. Int. J. Mining and Mineral Engineering, 7(4) ...
    ... mine planning conference. 29. Whittle D., 2011. Open-Pit Planning and Design, SME Mining Engineering Handbook. 3rd ed. s.1.:Society for Mining, Metallurgy, and Exploration, Inc. (SME). 30. Whittle J., 1999. A decade of open pit mine planning and optimization - The craft of turning algorithms into ...
    ... Mines. Perth, Orebody Modelling and Strategic Mine Planning Symposium. 10. Hartman, H. L., 1992. SME Mining Engineering Handbook. Littleton, Colorado: Society for Mining, Metallurgy, and Exploration, Inc.. 11. Hustrulid W, Kuchta M, 1998. Open Pit Mine Planning and Design. Vol 1 ed. Rotterdam ...

  • Efficiency and lifetime of medium voltage transformers

    Snežana Aleksandrović, Vesna Damnjanović (2017)

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability
    ... on to increase utilization of overburden and coal systems on open pit mines of EPS (in Serbian) (2018) Study, Faculty of Mining and Geology, Belgrade 2. Jovantié, P. Maintenance of mining machines (in Serbian), University of Belgrade — Faculty of Mining and Geology, Belgrade, 2014. 3. Gransberg, D ...
    ... Operating costs by years for CAT D8R and Dressta TD25M dozers in PE EPS are shown in Figure 4. Costs increasing trend is evident in this interpretation. In case of applying profit life criterion CAT D8R dozer should be replaced after 7 years of operation, ог in this case after 22,000 working hours ...
    ... including savings and improvements, can be achieved by these activities: In-time replacement of auxiliary machines and vehicles; Usage of proven and quality machines with implemented unification as much as possible; Improvement of maintenance system; Implement modern and improved technologies in machine operation ...

  • Genesis and metallogenetic setting of the polymetallic barite-sulphide deposit, Bobija, Western Serbia

    Marcel Maurer, Dejan Prelević, Regina Mertz-Kraus, Aleksandar Pačevski, Bojan Kostić, Jovana Malbašić (2019)
    Trejs elementi u sfaleritu, izotopi sumpora, datiranje cirkonom, SEDEX, SHMS, dominantno klastični Pb-Zn, sulfidi, ležišta

  • Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining

    Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić (2021)
    Geology,Geotechnical Engineering and Engineering Geology
    ... excavated. 2. Coal Mining in Underwater Pit “Kovin” Exploration work in the coal and gravel deposit area began in 1976, while coal exploita- tion began in 1995. Coal is mined from the bottom of the lake connected to the Danube, and is the only mine with underwater coal exploitation in the world. A continuous ...
    ... basin at the underwater pit Kovin. Min. Met. Eng. Bor 2016, 1, 95–102. [CrossRef] 21. Zivotic, D.; Cvetković, O.; Vulić, P.; Gržetić, I.; Simić, V.; Ilijevic, K.; Dojčinović, B.; Erić, S.; Radić, B.; Stojadinović, S.; et al. Distribution of major and trace elements in the Kovin lignite (Serbia) ...
    ... FL—lateral, and FFT—forward thrust). In the past, the relationship between digging material and specific digging resistance for wheel operation has been analyzed both theoretically and practically. The most critical researchers have been Himmel, Limbrek and Marcelli, Brach, Dombrowski, and Kubec [1,14] ...

  • An Approach to Management Decision Support: The Coal Mine Pljevlja Management Information System

    Božo Kolonja, Ranka Stanković, Filip Vuković, Ivan Obradović (2006)
    In this paper we describe the approach that has been used in the development of the Management Information System (MIS) in the Coal Mine Pljevlja in Montenegro. The methodology of this approach was based on new information technologies and management techniques which have already been successfully applied in other related fields. Its main goal was to introduce modern management techniques to mining, adapted to specific features of the mining industry, its operations and environment, thus enabling the tactical management ...
    ... rolled up to open pit, or the whole mine, aggregated for specified period, by products (figure 5). In drilldown reports, OLAP can go in the reverse direction and automatically display detailed data that comprises consolidated data. For example, equipment breakdowns can be accessed by mining production ...
    ... not simply the implementation of new machines, computers and software. Technology should be employed to plan, design and operate differently, to be better informed and intelligent in decision-making, more efficient in operation, safer, and more responsible to society. This paper is focused on the ...
    ... production process, in all the technological phases, is being carried out by regular data input, in order to make data electronically registered in real time and presented for inspection, to help production process management and periodical reporting. All production capacities in the technological ...