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Упит dcterms_subject_txt:marginal costs,

125 items

  • Sepiolite – a by-product of exploitation as a potential raw material in Serbian industry

    Radmila Gaćina, Katarina Urošević, Jelena Zakonović (2019)
    This paper gives a brief overview of the sepiolite deposits, the basic properties, and the possibilities of using this mineral. Particular attention is paid to sepiolites from domestic production, especially the use of sepiolites suitable for the development of small businesses and technologies, with a focus on environmental protection. Aim of this paper is to point out importance of this mineral and to draw attention to the use of domestic raw materials. With appropriate mechanical and chemical pretreatments, sepiolite is ...
    sepiolite, by-product, small-scale mine, marginal costs,

  • 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
    ... OPERATIONAL COSTS + COSTS OF OPERATOR Following conclusions can be made on average costs for strong and very strong dozers operating on open- cast lignite mine: e Average costs for strong dozers are 63.75 €/mh; e Average costs for very strong dozers are 95.12 €/mh. 288 Limiting costs based оп these уајџез ...
    ... operational costs, including data on auxiliary machines (Caterpillar and Komatsu methods). Integration of this information with operational conditions will enable reliable evaluation. Total costs, i.e. specific cost per moto hour is the sum of following costs: TOTAL COSTS = OWNERSHIP COSTS + OPERATIONAL ...
    ... орегаптр costs 287 o o Therefore, it can be said that economic life of the machine is defined by overall costs. However, it should be noted that any activity and each segment of life cycle requires investment of some kind. Life cycle costs can be classified as follows (Eq. 1): e Ownership costs: o ...

  • Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines

    Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković (2021)
    The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...
    In Pit Crushing and Conveying, IPCC, open pit mining, haulage, optimization, costs saving

  • Development of the Cost-Based Model for Monitoring the Lifetime of the Earth Moving Machines

    Ugljesa Bugarić, Milos Tanasijević, Stevan Djenadić, Dragan Ignjatović, Ivan Janković (2022)
    This paper presents the model for the identification of reference points on the lifetime curve of engineering systems. This curve commonly represents the increase and decline of failure in relation to time. A direct correlation between failure rate and costs is assumed in this paper, therefore, statistical and empirical analysis of costs provided reference points. This approach is used for positioning stages of the engineering system’s lifetime with a minimal number of failures and costs, regardless of whether these ...
    Electrical and Electronic Engineering,Industrial and Manufacturing Engineering, Control and Optimization, Mechanical Engineering, Computer Science (miscellaneous), Control and Systems Engineering

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • Unvestments in Geological Exploration and Afectation on Mining Operating Cash Costs at Lignite Open Pits Kolubara (Lazarevac), Serbia

    Vuckovic Bogoljub, Dimitrijevic Bojan (2018)

  • Lost production costs of the overburden excavation system caused by rubber belt failure

    Bugarić Uglješa, Tanasijević Miloš, Polovina Dragan, Ignjatović Dragan, Jovančić Predrag (2012)

  • 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 ...
    ... has already been applied in the development of the first phase of the Coal Mine Pljevlja MIS aimed at monitoring and management of transportation costs, in the summer of 2005. It resulted in the establishment of an efficient system of information, thus motivating the mining management, especially ...
    ... processes, as well as the development of more complex components of management. The first results showed that considerable reduction of transportation costs are possible and the coal mine top management made a decision to continue developing the other subsystems of the MIS following the same approach. ...
    ... reporting needs are modeled through by a global model of data related to the most important business segments (production, maintenance, operative costs, etc.). MIS presents updated and precise data to the managers of the company in a clear and synoptic way. It is necessary that all the operative ...

  • Production information system of the Pljevlja coal mine

    Božo Kolonja, Ranka Stanković, Filip Vuković (2018)

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... taking initial costs, energy costs, repair costs and maintenance. The cost comparison is based on wells and on the oil field. Costs are: investment costs, service costs, repair costs, additional personnel costs, energy costs, maintenance costs, stop costs, inventory costs, and general costs. Finally, ...
    ... investment costs as well as repair and maintenance costs [9]. In 1995, Lloyd R. Heinze and a group of authors used a “decision tree” to choose artificial lift methods, where the main factor was long-term economic analysis. Other factors that influence the evaluation of the method are operational costs, primary ...
    ... Conditions in which the well operates (location, availability of energy, training of people, etc.) III. Economic factors (capital costs, operating costs, and maintenance costs.) Selection methods can be divided according to the mode of operation in three groups (Table 1): Table 1. Group of parameters ...

  • Analiza osnovnih indikatora upotrebnog kvaliteta mašina pomoćne mehanizacije na površinskim kopovima uglja

    Stevan Đenadić, Dragan Ignjatović, Predrag Jovančić, Milena Lekić, Žarko Aleksić, Ivan Janković (2022)
    Izbor optimalnog tipa mašine i adekvatno upravljanje kroz životni vek je kompleksan zadatak. Osnovna pitanja koje se postavljaju prilikom rešavanja ovog zadatka vezana su za stepen zadovoljenja rada mašine i optimalan trenutak zamene iste. U ovom radu je izvršena analiza rada dozera koji su u radu na površinskom kopu lignita RB Kolubara. Analizom je obuhvaćeno 4 različita proizvođača dozera a to su: Caterpillar, Dressta i Shantui i Liebherr. Analiza je izvršena sa aspekta ukupnih troškova koji se stvaraju i ...
    rudarstvo, mehanizacija, upotrebni kvalitet, troškovi, empirijska raspoloživost

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... Ownership costs [€/mh] 15.51 17.73 11.77 9.92 Operational costs [€/mh] 37.95 35.69 41.45 35.01 Human resource costs [€/mh] 11.79 11.79 11.79 11.79 Table 8. Results of the pair-wise comparison of economic sub-criteria: Ownership costs (OW), operational costs (OP), and human resource costs (HR). Ownership ...
    ... equipment and machines used there. The sub-criteria implemented into the economic parameters were: Ownership costs, operational costs, and human resource costs [33]. When estimating the ownership costs (OW), the necessary information was the delivery price of the machine, while for the amortization period ...
    ... far was adopted. The operational costs (OP) included the cost of fuel, lubricants and oils, maintenance and the cost of hiring the maintenance staff. The human resource costs (HR) were identified as the amount of costs of hiring machine operators. To calculate the costs, the necessary information was: ...

  • Asset management and condition monitoring on maintenance of mining equipment lignite mines

    Predrag Jovančić (2016)
    Maintenance strategy, once set, is not permanent. This strategy should be adapted and altered according to the findings, achieved results, variation of mine product prices, changes in the region etc. On the other hand, maintenance strategy should be: safe operation, higher productivity, reduced costs and functionality of complete system. Asset management represents activities through which mine achieves the optimal and sustainable management of its property, in order to meet the plan - realization of production with optimized costs. Therefore, ...

  • Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs

    John Nyame (2024)
    The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...
    Carbon Capture, Utilization and Storage
    ... extra storage costs are limited to marginal fuel/energy consumption for the gas turbines driving the compressors and the CO2 tax paid for the compressor fuel exhaust. Natural gas consumption is estimated at 4 000 Sm?/t CO-». Since the Sleipner field itself produces natural gas, costs are calculated ...
    ... system. OPEX are the costs required to operate a business. CLcc=CcapEx+CopEx (14) Only the costs of process facilities are considered to calculate the CAPEX in this study because the facilities are installed on the CO- carrier; CcAPEx=Cfacilities (15) The main costs contributing: to the OPEX ...
    ... eliminating the potential for long-term leakage [60]. Onshore storage costs for saline formations in Europe for depths of 1000—3000 m is 1.9— 6.2 USS/t CO>, with a most likely value of 2.8 USS/t CO» stored. Estimated costs for offshore storage over the same depth range cover reuse of existing oil ...

  • Application of the PROMETHEE and VIKOR methods for selecting the most suitable carbon dioxide geological storage option

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac (2019)
    CO2 storage in geological formations is one of the leading solutions for mitigation of greenhouse gas emissions. Types of geological formations that can be used for CO2 storage, that are discussed in this paper are: depleted oil and gas reservoirs, saline aquifers and injection CO2 in partially depleted oil reservoirs for enhanced oil recovery (EOR–CO2 method). In order to select the most suitable geological storage of CO2, the ranking of these storage options was performed using two methods of ...
    Prometej, vikor, višekriterijumsko odlučivanje, geološko skladištenje

  • Challenges of Energy Transition in the Individual Heating Sector

    Boban Pavlović, Dejan Ivezić, Marija Živković (2022)
    U radu su prikazani rezultati istraživanja i ankete koja je sprovedena 2020. godine u domaćinstvima sa individualnim sistemima grejanja u Srbiji. Cilj ankete je bio da se sagleda stanje individualnih sistema grejanja, ali i stavovi vlasnika sistema vezano za energetsku tranziciju. Rezultati ukazuju na zastarelost sistema grejanja, nisku efikasnost, nedovoljna ulaganja u primenu mera energetske efikasnosti i nedostatak finansijskih sredstava za ulaganje u održivo grejanje. Osnovni prioriteti kod izbora načina grejanja jesu troškovi kupovine sistema i troškovi energenta, dok ...
    Energetska tranzicija, Individualni sistemi grejanja, Stavovi domaćinstava, Anketa, Srbija

  • Design of the Opencast Coal Mine Drmno Dewatering System

    Vladimir Pavlović, Dušan Polomčić, Tomislav Šubaranović (2014)
    Development of mining in the opencast mine Drmno from Kostolac basin in Serbia is carried out in the increasingly complex geological and hydro geological conditions with the decline of the coal seams to the alluvial part of Europe's largest river Danube. Greater depth and inflow of groundwater significantly increase costs for dewatering facilities construction with the requirement for optimizing of this more and more important surface mining process. Making decision on screen construction in the opencast mine with redesign ...
    dewatering system, groundwater, hydrodynamic model, dewatering wells, screen, reliability, environmental effects.

  • The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia

    Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić (2019)
    For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...
    landfill, geotechnical investigations, transfer station
    ... electrical installations) at locations outside urban areas, so the costs of preparing the terrain often exceed the costs of establishing a recycling yard, i.e. transfer station, • increasing investment and exploitation costs for equipment and labor. 3. PRESENTATION OF TRANSFER STATION „PRELICI“ ...
    ... and terrain preparation based on local geotechnical conditions, • the possibility of joint use of related equipment and space, without doubling the costs of technical relocation of facilities, • technological connection of planned units, • use of existing infrastructure facilities and their integration ...
    ... material for the work of the recycling industry. The mass and volume of the final disposed municipal waste are reduced, and therefore the operating costs. From the aspect of local self-government, the way of waste treatment is being improved, a certain number of workers of lower social status are ...

  • Business Models for Small-scale Biomass Projects Development

    Dejan Ivezić, Miodrag Gluščević, Marija Živković (2019)
    Biomass is recognized as the most promising renewable energy source in Serbia. The share of biomass in Serbian final energy consumption is over 10%, but mostly related to traditional use in stoves and ovens. One of the main obstacles for wider implementation of contemporary biomass facilities is the inexperience of consumers and stakeholders in the implementation of “innovative” business models, especially in the cases of small-scale projects. In this paper, three different business models (public utility company, energy cooperative ...
    ... continuation of the existing practice, i.e. the financing of costs of heating in public buildings in Kostojevići from the budget of the City of Bajina Bašta. This model also means that the investment in the proposed solution and its operation costs would be financed from the city budget, and that the city ...
    ... reduction is possible by implementation of energy efficiency measures. Fuel shift, from coal to woodchips, would additionally reduce fuel costs. All investment costs (energy efficiency measures, replacement of boiler, reconstruction of boiler house, etc.) are the responsibility of ESCO company. City of ...
    ... cooperative or other legal entity, should not have preferential treatment in the public procurement procedure. However, it is well known that transport costs have significant share in the price of biomass, and from that point of view, local biomass producers would be in a better position. Energy cooperative ...

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... verage costs of electricity’’ (USD/kWh) is introduced. This indicator is available in IRENA’s report on renewable power generation costs in 2018 (IRE, 2019), and it is calculated for all commercially available renewable power generation technologies. As it pointed out, the analysis of costs in IRENA’s ...
    ... ewable-Power-Generations-Costs-in-2018.pdf https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2019/May/IRENA_Renewable-Power-Generations-Costs-in-2018.pdf https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2019/May/IRENA_Renewable-Power-Generations-Costs-in-2018.pdf https://www.irena ...
    ... the costs of renewables from the perspective of investors, whether they are a state-owned electricity generation utility, an independent power producer, or a community looking to invest in renewables. The analysis excludes the impact of govern- ment incentives or subsidies, system balancing costs associated ...