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Упит dcterms_subject_txt:small-scale mine

395 items

  • Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry

    Steven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti (2021)
    Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...
    self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalization

  • Optimizacija utovarno-transportnih sistema u funkciji planiranja površinskog kopa

    Mirjana V. Banković (2018-07-13)
    Profitabilna eksploatacija sve složenijih ležišta je težak zadatak koji zavisi odtemeljnog procesa analize, planiranja i projektovanja rudnika. Izvodljiv strateškiplan mora da zadovoljava društvena, regulatorna, tehnološka, geometrijska iekonomska ograničenja. Kako bi se postigao osnovni cilj, odnosno profitabilnost iodrživost rudarskog projekta na duži period, neophodno je unapređenjematematičkih modela i informatičke podrške procesima planiranja i optimizacijekoji će omogućiti efikasnu realizaciju ovih ciljeva...
    tehnološki model, integralni model, planiranje, optimizacija,utovarno-transportni sistem, neto sadašnja vrednost projekta
    ... on the effectiveness of mine design software for pit optimisation and scheduling at the Mt. Thorley Warkworth Coal Mine. BE Thesis, School of MiningEngineering, The University of New South Wales. Gershon, M. E., 1983, Optimal mine production scheduling: evaluation of large scale mathematical programming ...
    ... surface mine planning function. Mirjana V. Banković Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Optimizacija utovarno-transportnih sistema u funkciji planiranja površinskog kopa;Optimization of excavation-transportation systems in the surface mine planning ...
    ... making-Application to mine planning under price uncertainty. 35th APCOM Symposium-Application of Computers and Operations Research in the Minerals Industry, Proceedings, 371-380. Gy, P. M., 1981, A new theory of bed-blending derived from the theory of sampling—development and full-scale experimental check ...

  • XRD dertermination od hydrothermal phases related to epithermal mineralization in the Čukaru Peki deposit

    Dragana Bosić, Vladica Cvetković, Miodrag Banješević, Kristina Šarić (2024)
    Čukaru Peki, epithermal mineralization, hydrothermal alterations

  • Fragmentation Size Prediction of Blasted Material Using a Specialized Software for Drilling and Blasting

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić, Miljan Gomilanović (2024)
    Design and optimizing the drilling and blasting parameters, should fill the requirements for the capacity, fragmentation size, and technical characteristics of loading and transport equipment, and enable a safe work at the open pit. Besides mentioned, it also achieves the minimal impact on the environment of the open pit and decreases the negative effects on the environment, especially in the blast vibration and flyrock. To obtain the best possible blasting effects and consider all the factors, a specialized software is ...
    optimization, O-Pitblast, drilling, blasting, fragmentation size

  • Geomechnical research for the new bucket wheel excavator testing at Open pit “Filijala”

    Vladimir Čebašek, Nebojša Gojković, Veljko Rupar, Miodrag Pribićević (2020)
    Since 1976 cement marl excavation at open-pit mine „Filijala” is carried out by continuous exploitation technology using bucket wheel excavator SH 400 manufactured by Orenstein und Koppel (O & K) company. Due to the bucket wheel excavator time-worn and high operating cost it was necessary to replace it with new one. In order to test the new bucket wheel excavator and prove its capacity a testing zone was defined as test block for excavation, in which the bucket wheel ...
    отпор на копање, лапорац, роторни багер

  • Optimizacija i planiranje površinskih kopova stohastičkim modelima

    Dejan R. Stevanović (2015-05-29)
    Savremeno rudarstvo izloženo je stalnom trendu pogoršanja uslova poslovanja.Mogućnost ostvarenja ekonomskih i drugih ciljeva rudarskog projektakompromitovana je stalnim pogoršanjem kvaliteta ležišta na kojima se vršieksploatacija, kao i značajnoj dozi neizvesnosti povezane sa geološkim,ekonomskim i tehničkim parametrima proizvodnje. U ovako kompleksnimuslovima poslovanja, matematički modeli sposobni da odgovore značajnimizazovima, odnosno ponude optimalna rešenja kojima se garantuje maksimalnoispunjenje projektovanih ciljeva, nameću se kao neophodnost.Trenutni, konvencionalni pristup optimizaciji i planiranju površinskih kopovazasniva se na algoritmima, razvijenim sredinom prošlog veka čije je opšteobeležje deterministički ...
    površinski kop, planiranje, optimizacija, stohastički modeli, kontrola kvaliteta uglja, neizvesnost.
    ... Optimal mine production scheduling: evaluation of large scale mathematical programming approaches. International Journal of Mining Engenering, , vol. 1, str. 315 – 329 Gibson R, 2006, Sustainability assessment and conflict resolution: Reaching agreement to proceed with the Voisey's Bay nickel mine, Journal ...
    ... stohastičkim modelima;Open pit mine optimization and planning with stochastic models Dejan R. Stevanović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Optimizacija i planiranje površinskih kopova stohastičkim modelima;Open pit mine optimization and planning with ...
    ... 2008, Long-term open pit mine production planning: a review of models and algorithms, International Journal of Mining, Reclamation and Environment, Vol. 22, No. 1, str. 3-35 Pana, M. T, Carlson, T.R, 1966, A Description of Computer Technique Used in Mine Planning of the Utah Mine of Kennecott Copper Corp ...

  • Keyword-Based Search on Bilingual Digital Libraries

    Ranka Stanković, Cvetana Krstev, Duško Vitas, Nikola Vulović, Olivera Kitanović (2017)
    This paper outlines the main features of Biblisha, a tool that offers various possibilities of enhancing queries submitted to large collections of aligned parallel text residing in bilingual digital library. Biblishsa supports keyword queries as an intuitive way of specifying information needs. The keyword queries initiated, in Serbian or English, can be expanded, both semantically, morphologically and in other language, using different supporting monolingual and bilingual resources. Terminological and lexical resources are of various types, such as wordnets, electronic ...

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... Stanković, R., Vuković, F., Obradović, I., An Approach to Management Decision Support: The Coal Mine Pljevlja Management Information System, Proceedings of the Fifteenth International Symposium on Mine Planning and Equipment Selection, Torino, Italy, Vol. 1, pp. 436-441, 2006. [6] Krstev, C., Stankovic ...
    ... also already being used, among other things for the production of controlled dictionaries related to planning and management of exploitation, to mine safety protection systems, mining equipement management, human resources management systems, as well as in a business intelligence module of the ...
    ... dictionary and the content of the database. Some other controlled dictionaries that can be derived from RudOnto are the Geostatistics dictionary, Mine safety protection dictionary, Mineral resource exploitation dictionary, Petroleum exploitation dictionary, but also dictionaries of general terms ...

  • A Fuzzy Expert Model for Availability Evaluation

    Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić (2019)
    Each technical system within itself carries the great potential danger of possible occurrence of failure and damages. Mining machines are characteristic by great investment values, costs of unplanned shutdowns, complex working conditions, and environment and workers hazards. Systematic monitoring of the mining machinery is of great importance for the management of the mining companies. Availability is the overall concept of quality of service. Includes information regard to operating state, an idle state, a standby state and shut down. The ...
    raspoloživost, ekspertski sistem, fazi teorija, buldozeri
    ... AVAILABILITY INDICATORS A n a ly st N o . A v a il a b il it y in d ic a to r Questionnaire: Bulldozer Liebherr – Drmno Open Pit Mine Grade: Excellent Good Average Adequate Poor The degree of affiliation, % 1 R 40 60 M 100 S 100 2 R 20 80 M 100 S ...
    ... Rpoor.0 = (1/0, 2/0, 3/0, 4/0, 5/0) After adding to each j, the fuzzy expression (membership function µ) for reliability of Liebherr which operate on mine Drmno, is obtained: μRLib-D = {(0), (0.08), (0.155+0.32), (0.015+0.62+0.008), (0.06+.0155)} = (0, 0.08, 0.475, 0.715, 0.215) In the same way, ...
    ... ”average” grade. a – for each machine individually b – for each type of machine c – for each linguistic variable d – for each open step mine Fig. 4. Comparative analyze of obtaining results for bulldozers availability evaluation TABLE II. DETERMINED AVAILABILITY ON THE BASE OF MEASURED ...

  • Optimizacija i planiranje površinskih kopova stohastičkim modelima

    Dejan R. Stevanović (2015-05-29)
    Savremeno rudarstvo izloženo je stalnom trendu pogoršanja uslova poslovanja.Mogućnost ostvarenja ekonomskih i drugih ciljeva rudarskog projektakompromitovana je stalnim pogoršanjem kvaliteta ležišta na kojima se vršieksploatacija, kao i značajnoj dozi neizvesnosti povezane sa geološkim,ekonomskim i tehničkim parametrima proizvodnje. U ovako kompleksnimuslovima poslovanja, matematički modeli sposobni da odgovore značajnimizazovima, odnosno ponude optimalna rešenja kojima se garantuje maksimalnoispunjenje projektovanih ciljeva, nameću se kao neophodnost.Trenutni, konvencionalni pristup optimizaciji i planiranju površinskih kopovazasniva se na algoritmima, razvijenim sredinom prošlog veka čije je opšteobeležje deterministički ...
    površinski kop, planiranje, optimizacija, stohastički modeli, kontrola kvaliteta uglja, neizvesnost.
    ... Optimal mine production scheduling: evaluation of large scale mathematical programming approaches. International Journal of Mining Engenering, , vol. 1, str. 315 – 329 Gibson R, 2006, Sustainability assessment and conflict resolution: Reaching agreement to proceed with the Voisey's Bay nickel mine, Journal ...
    ... stohastičkim modelima;Open pit mine optimization and planning with stochastic models Dejan R. Stevanović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Optimizacija i planiranje površinskih kopova stohastičkim modelima;Open pit mine optimization and planning with ...
    ... 2008, Long-term open pit mine production planning: a review of models and algorithms, International Journal of Mining, Reclamation and Environment, Vol. 22, No. 1, str. 3-35 Pana, M. T, Carlson, T.R, 1966, A Description of Computer Technique Used in Mine Planning of the Utah Mine of Kennecott Copper Corp ...

  • Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata

    Aleksandra Tomašević, Ljiljana Kolonja, Ivan Obradović, Ranka Stanković, Olivera Kitanović (2012)
    ... this paper encompass only a part of the data related to mine production, and pertain to an important segment that demands visual representation. More precisely, the paper tackles exploration works, sample analysis, infrastructure within the mine and in its environment, excavating and loading equipment ...
    ... costs, monitor the position and availability of mining equipment (excavators, conveyor belts, trucks, etc.), the state of mining objects, works on mine benches coal and waste dumps. The application of GIS is especially important in the environment protection area, as it enables active monitoring of ...
    ... system, and at the same time easily access alphanumeric data. The outlined solution is only the first step in creating an integral GIS system for a mine. Hence, further research in this area will focus on extension of the OpmGIS system with thematic classes related to production, integration with deposit ...

  • Application of softwares for drilling and blasting

    Stefan Milanović, Lazar Kričak, Milanka Negovanović, Nikola Simić, Jovan Marković (2019)
    U današnje vreme softveri se sve više primenjuju u rudarstvu kroz eksploataciju mineralnih sirovina, projektovanje rudnika, u obavljanju različitih operacija na terenu i sl. Među softverima za rudarstvo, postoje softveri za specifične rudarske operacije, kao što su operacije bušenja i miniranja. Ovi procesi su veoma važni u eksploataciji čvrstih mineralnih sirovina, jer predstavljaju najjeftiniji i najefikasniji oblik fragmentacije stenske mase. Kroz rad, predstavljeni su neki od softvera u kombinaciji sa modernim tehnologijama, koje se koriste širom sveta i koje ...
    softver, moderne tehnologije, miniranje, bušenje, minsko polje

  • Correlation of uniaxial compressive strength with the dynamic elastic modulus, p –wave velocity and s –wave velocity of different rock types

    Jelena Majstorović, Miloš Gligorić, Suzana Lutovac, Milanka Negovanović, Luka Crnogorac (2019)
    Knowing mechanical properties of rocks incorporated with ultrasonic waves velocities investigations provide a secure basis for mine modelling. Uniaxial compressive strength, dynamic elastic modulus and ultrasonic waves velocities are just some of the rock properties that indicate on presence of discontinuities, stratification and fissures of rocks. Determining the relationship of these rock properties testing the rock samples that are corresponding to different rock types extracted from different mineral deposits represents the core of this study. In this paper, we ...
    линеарна регресија, метода најмањих квадрата, динамички модул еластиности, брзина уздужних таласа

  • Estimating hydraulic parameters for the complex hydrodynamic models

    Dušan Polomčić, Dragoljub Bajić, Jelena Ratković, Bojan Hajdin (2018)
    Hydrodynamic models have usually been calibrated manually, by trial-and-error, with different values of hydraulic parameters and hydraulic characteristics of boundary conditions. This method of calibration and estimation of hydraulic parameters requires an extensive knowledge and experience of experts, but whether the resulting solution includes an optimal set of parameters still remains an open question. An optimization method founded upon the Gauss-Marquardt-Levenberg algorithm, along with PEST software based on that algorithm, introduces automation of model calibration with regularization, which substantially ...
    kalibracija, optimizacija, PEST, koeficijent filtracije

  • Transformer-Based Composite Language Models for Text Evaluation and Classification

    Mihailo Škorić, Miloš Utvić, Ranka Stanković (2023)
    Parallel natural language processing systems were previously successfully tested on the tasks of part-of-speech tagging and authorship attribution through mini-language modeling, for which they achieved significantly better results than independent methods in the cases of seven European languages. The aim of this paper is to present the advantages of using composite language models in the processing and evaluation of texts written in arbitrary highly inflective and morphology-rich natural language, particularly Serbian. A perplexity-based dataset, the main asset for the ...
    General Mathematics, Engineering (miscellaneous), Computer Science (miscellaneous)

  • Model za optimizaciju graničnog saržaja metala u rudi u funkciji dugoročnog planiranja površinskih kopova

    Daniel P. Kržanović (2016-06-14)
    Optimizacija graničnog sadržaja metala u rudi jedan je od osnovnih koraka u planiranju i dizajniranju površinskih kopova i ima za cilj postizanje maksimalne neto sadašnje vrednosti (NPV). Iz tog razloga, optimizacija graničnog sadržaja i danas je predmet mnogih istraživanja u rudarskoj nauci, sa ciljem rešavanja praktičnih problema u eksploataciji ležišta.Dugoročno planiranje eksploatacije na površinskim kopovima podrazumeva sagledavanje svih relevantih parametara i faktora (geologije rudnog ležišta, tehnologije proizvodnog procesa, kapaciteta otkopavanja i prerade, troškova, cena metala, iskorišćenja i dr) kako ...
    površinski kop, dugoročno planiranje, optimizacija graničnog sadržaja, maksimizacija neto sadašnje vrednosti (NPV).
    ... Lokacija svakog mini bloka u blok modelu tačno je određena x, y i z koordinatama. 205  Izračunate vrednosti za sledeće atribute bloka smatraju se jedinstvenim:  zapreminska masa svakog mini bloka  sadržaj metala u svakom mini bloku  sadržaj oksidinih minerala u svakom mini bloku.  ...
    ... Profitability Sensitivity Analysis of a Mining Venture, Mine Evaluation Seminar at the University of Minesota. Bernabe, D., Dagdelen, K., 2002, Comparative analysis of open pit mine scheduling techniques for strategic mine planning of TINTAYA copper mine in Peru, SME Annual Meeting. Berry, E.S., 1922 ...
    ... A., Newman, A.M., 2008, Modern Strategic Mine Planning, dostupno na:http://inside.mines.edu/~gdavis/Papers/CRC_Mining_Conference_Paper.pdf. Dimitrakopoulos R., 2011, Strategic mine planning under uncertainty, stochastic optimization for strategic mine planning: a decade of developments, Journal ...

  • 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
    ... ckpHmra. Beorpan: PynapcKo-reoJmomku (pakynTerT. 3. Cardu M., Ciccu R., Lovera E., & Michelottl E. , 2006. Mine Planning and Equipment Selection. s.1., The Fifth International Symposium on Mine Planning and Equipment Selection. 4. Coombes J, 2004. Resource Estimation. :Snowden Mining Industry C ...
    ... Multi-mine Better Than Multiple 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 ...
    ... Exploration (SME). 14.Joukoff T. ; Purdey D. ; Wharton C., 2004 . Development and Application of Whittle Multi-Mine at Geita Gold. Perth, Proceedings of the Orebody Modelling and Strategic Mine Planning Conference. 15. Kennedy B. A., 1990. Sur/face Mining. Littleton, Colorado: Society for Mining, ...

  • The influence of structural modification of Pd(II) pincer-type complexes on the kinetics of substitution reactions

    Snežana Jovanović Stević, Snežana Radisavljević, Aleksandar Mijatović, Biljana Petrović, Ana Kesić (2023)
    This mini-review summarizes the kinetic data obtained for the substitution reactions of some palladium(II) complexes containing bis-pyrazolylpyridine derivatives as pincer-type ligands with biologically significant nitrogen- and sulfur-donor biomolecules as nucleophiles. Three structurally different palladium(II) complexes were selected: [Pd(L1)Cl]+ (Pd1), [Pd(L2)Cl]+ (Pd2) and [Pd(L3)Cl]+ (Pd3) (where L1 = bis(2-(1H-pyrazol-1-yl)ethyl)amine, L2 = 2,6-bis(5-(tert-butyl)-1H-pyrazol-3-yl)pyridine, and L3 = 2,6-bis(5-(tert-butyl)-1-methyl-1H-pyrazol-3-yl)pyridine, while for the entering nucleophiles were used thiourea (Tu), L-methionine (L-met), and guanosine-5’-monophosphate (5’-GMP). Kinetic measurements were carried out for all systems as pseudo-first ...

  • Određivanje prostorne distribucije vrednosti hidrauličkih parametara izdani: primer površinskog kopa „Radljevo“

    Dragoljub Bajić, Dušan Polomčić, Jelena Ratković, Predrag Pajić (2019)
    Najčešće se kalibracija hidrodinamičkih modela vršila manuelno - „probanjem“ sa različitim vrednostima hidrauličkih parametara i hidrauličkih karakteristika graničnih uslova. Ovakav način rada zahteva veliko znanje i iskustvo eksperta, pri čemu ostaje otvoreno pitanje da li dobijeno rešenje ima optimalan skup parametara. Primenom optimizacione metode, koja se zasniva na Gauss-Marquardt-Levenberg-ovom algoritmu, i PEST softvera, ...
    kalibracija hidrodinamičkog modela, PEST, koeficijent filtracije

  • Mikrobiološki diverzitet kiselog jezera Robule i uticaj jezerske vode na oksidaciju sulfidnih minerala

    Srđan B. Stanković (2016-09-11)
    Jezero Robule, formirano u podnožju rudničke raskrivke Oštreljski planir (Rudnik bakra Bor), je nastalo kao posledica rudarskih aktivnosti. Mikrobiološki diverzitet ekstremno kiselog jezera Robule ispitivan je primenom kako klasičnih mikrobioloških metoda (svetlosna mikroskopija i kultivacija na selektivnim podlogama) tako i primenom savremene metode molekularne biologije (analiza polimorfizama terminalnih restrikcionih fragmenata; T-RFLP). Takođe, ispitivan je i potencijal i efikasnost jezerske vode u biološkom luženju mineralnog koncentrata, kao i u bioluženju uzoraka stare flotacijske jalovine Rudnika bakra Bor.Na osnovu dobijenih rezultata ...
    jezero Robule, acidofilne bakterije, bioluženje, kisele rudničke vode, flotacijska jalovina
    ... bacteria, overburden has continuously been generating acid mine drainage that flows into the lake after rainfall. Based on these results a biogeochemical model of iron circulation in the lake was proposed. In the experiments at laboratory scale, efficacy of bioleaching of the mineral concentrate (17 ...
    ... bioleaching. Therefore, bioleaching of samples taken from depths of 10, 15, and 20 meters from Old flotation tailings of the Copper Mine Bor was performed at laboratory scale using the Lake water as lixiviant. Yield of copper after five weeks of the bioleaching experiment was 68.34±1.21 %, 72.57±0.57 ...
    ... This is important finding, since reduction of content of pyrite in tailings reduces its ability to generate acid mine drainage. Keywords: lake Robule, acidophilic bacteria, acid mine drainage, bioleaching, flotation tailings. Scientific field: geology Specific scientific field: g ...