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Journal articles on the topic 'Mine and Metal Company'
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1
Garinas, Wahyu wahyu. "THE IMPACT OF COVID-19 PANDEMIC ON METAL MINERAL COMMODITIES IN INDONESIA AND THEIR MITIGATION IN MINING ACTIVITIES." Jurnal Sains dan Teknologi Mitigasi Bencana 15, no. 2 (December 30, 2020): 123–30. http://dx.doi.org/10.29122/jstmb.v15i2.4461.
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Abstract The Covid-19 pandemic in 2020, has affected all mining sectors. The price of mining materials index is very low due to the Covid-19 pandemic and also when compared to other pandemics such as SARS, HN1, and Ebola. The price of the metal index such as iron, aluminum, nickel, zinc, copper) almost all fell and only high gold metals are increasingly expensive. The large mining companies continue their production and they use health protocols. For the continuity of mining operations, the company creates stages and strategies in mining operations (teamwork schedule, employee location, working time, number of workers, evacuation of employees). For the continuity of the company's operations, the company plans: responding to an emergency situations (pandemic), build the company's resilience, recover the company from impact, develop an action plan and build the foundation of the company to rise in the new normal time. The company conducts mitigation and protection individually and in groups and creates health campaigns digitally. In mining operations, the company develops its operational activities by implementing health protocols such as avoiding many people and making mine operational plans that follow health protocols. Keywords: Covid-19 pandemic, mineral commodity, index value, health mitigation.
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Irawan, Susan Nadya, Idiannor Mahyudin, Fakhrur Razie, and Susilawati Susilawati. "KAJIAN PENANGGULANGAN AIR ASAM TAMBANG PADA SALAH SATU PERUSAHAAN PEMEGANG IJIN USAHA PERTAMBANGAN DI DESA LEMO, KABUPATEN BARITO UTARA, KALIMANTAN TENGAH." EnviroScienteae 12, no. 1 (June 14, 2016): 50. http://dx.doi.org/10.20527/es.v12i1.1100.
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This study aims to know the factors that cause the formation of Acid Mine Water, to analyze the methods of prevention of acid mine drainage has been running effectively, to analyze how to prevent the formation of acid mine water at the research area. This research was conducted atLemovillage,North Barito Regency. These results indicate the analysis of water quality in the company with an indication acidic low pH values and high metal values. It is supported by soil pH test results showed low pH, especially on the layer in direct contact or close to coal. Sources of acid mine drainage at the company are from the oxidation of water and oxygen on the wall of rock at pit, water from the dumping area, water flowing from the temporary stockpile into the settling pond 2. From these, we can conclude the results. Recommendations prevention of acid mine drainage can be done by moving the location of the temporary stockpile in accordance with, more effective functioning of sump, controlling the movement of acidic water that has formed, accommodate and neutralize the acidic water that has formed, forming a layer of dry cover, separating the flow of water is not acidic and acidic
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Zhao, Yuan, Guoyan Zhao, Jing Zhou, Dianfei Pei, Weizhang Liang, and Ju Qiu. "What Hinders the Promotion of the Green Mining Mode in China? A Game-Theoretical Analysis of Local Government and Metal Mining Companies." Sustainability 12, no. 7 (April 8, 2020): 2991. http://dx.doi.org/10.3390/su12072991.
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China is currently trying to reduce the environmental impact of metal mining operations by promoting green mining. However, conflicts of interest between the central government, local governments, and metal mining companies often negatively affect the implementation of related policies. This paper conducted a theoretical analysis of the game mechanism between local governments and metal mining companies to study the factors that influence their strategies. First, we summarize the various game model parameters, determine the strategies which the companies and local government can choose, and establish the game model for the companies and the local government. Second, we list the utility of the company and local government under all game outcomes and analyse their behavioral tendencies. Third, we discuss the impacts of various factors on the choice of their mining mode in detail. The behavioral analysis shows that the local government’s inclination to supervise a mine is negatively related to the supervision cost and positively related to the production scale of this mine; various factors influence the companies in their decision making, with the yield and comprehensive utilization rate of tailings and waste rocks have the greatest impact; the scale of mine production also affects the companies’ willingness to carry out technological innovation. Finally, we offer some suggestions for the promotion of green mining.
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Uchendu, U. I., E. Biose, and E. A. Ubuoh. "Assessment of Heavy Metal Concentration in Soil Impacted Mining-Overburden in Enyigba, Abakaliki, Ebonyi State, Nigeria." Journal of Applied Sciences and Environmental Management 24, no. 7 (August 7, 2020): 1169–73. http://dx.doi.org/10.4314/jasem.v24i7.7.
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This study assessed the concentration of selected heavy metals (Lead and Zinc) from surrounding soil of Royal Salt mining company, Enyigba in Abakaliki LGA, Ebonyi State. Soil samples were collected from nine (9) different locations at depths of 0-15 and 15-30cm. Two (2) samples were collected from each of the nine locations, making it total of eighteen (18) samples. Soil analysis carried out were particle size distribution, pH, available Phosphorus, total Nitrogen, Organic Carbon, organic matter, Calcium, Magnesium, Potassium, Sodium, exchangeable acidity, Aluminium, effective cation exchange capacity, base saturation and two selected heavy metals, Lead (Pb) and Zinc (Zn). Results shows that heavy metals were highest in soil around the disposal site of mine waste. The highest value of Pb and Zn was recorded on tailing down (TD) 14.82 and 25.33mg/kg at 0-15cm depth, 7.22 and 18.93mg/kg at 15-30cm depth respectively. The accumulation of Pb and Zn at the mining site (TD) may be due to mining activities, civil, industrial/anthropogenic activities going on around the site. This study recommends regular monitoring of heavy metal concentration in soil within the mining site and their disposal site in order to conform to international standards set by the WHO.
Keywords: Abakaliki, Enyigba, Lead, Royal Salt Limited, Zinc
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Tost, Michael, Benjamin Bayer, Michael Hitch, Stephan Lutter, Peter Moser, and Susanne Feiel. "Metal Mining’s Environmental Pressures: A Review and Updated Estimates on CO2 Emissions, Water Use, and Land Requirements." Sustainability 10, no. 8 (August 14, 2018): 2881. http://dx.doi.org/10.3390/su10082881.
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The significant increase in metal mining and the inevitability of the continuation of this trend suggests that environmental pressures, as well as related impacts, have become an issue of global relevance. Yet the scale of the impact remains, to a large extent, unknown. This paper examines the mining sector’s demands on CO2 emissions, water use, as well as demands on land use focusing on four principal metals: iron, aluminium (i.e., bauxite ore), copper, and gold. These materials represent a large proportion of all metallic materials mined in terms of crude tonnage and economic value. This paper examines how the main providers of mining data, the United Nations, government sources of some main metal producing and consuming countries, the scientific literature, and company reports report environmental pressures in these three areas. The authors conclude that, in the global context, the pressure brought about by metal mining is relatively low. The data on this subject are still very limited and there are significant gaps in consistency on criteria such as boundary descriptions, input parameter definitions, and allocation method descriptions as well as a lack of commodity and/or site specific reporting of environmental data at a company level.
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Siregar, Ulfah Juniarti, and Roisatuz Zakiyah. "GROWTH OF FOUR TREE SPECIES ON MEDIA CONTAINING GOLD MINE TAILING OF PT ANTAM UBPE PONGKOR." Journal of Tropical Silviculture 7, no. 3 (December 28, 2016): S72—S76. http://dx.doi.org/10.29244/j-siltrop.7.3.s72-s76.
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PT Antam UBPE Pongkor is a gold mining company that produces waste in the from of tailing mud which contains heavy metal with sufficiently high concentration. The aim of this research was to study the growth of four types of plant, i.e. Casuarina junghuniana, Pinus merkusii, Melia azedarach, and Gmelina arborea in a media containing tailing mud. This research used a completely randomized factorial design with two factors, i.e. types of plant and media. Two kinds of media was used i.e. 1200g tailing and a mixture of 900g tailing and 300g compost. Growth parameters observed were plant diameter, height, number of leaf, leaf lenght and widht, total wet and dry biomass, root-shoot-ratio and number of stomata. Soil and plant analysis was done after four months of experiment. The results showed that plant types have significant effects on all parameters except root-shoot-ratio and plant height. Media types significantly affect plant diameter, wet and dry biomass. Interaction between plant types and media gave sifnificant effect on diameter, wet and dry biomass. G. arborea had the best growth response on all parameters except root-shoot-ratio and plant heigh. Its average diameter was 4.56 mm, leaf lenght 3.67 cm, leaf widht 3.000 cm, total wet biomass 50.21 g, total dry biomass 32.19 g and number of stomata is 89.Key words: C. junghuniana, G. arborea, metal, M. azedarach, tailing, P. merkusii.
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Park, Jonghoon, Eunhye Kwon, Euijin Chung, Ha Kim, Batbold Battogtokh, and Nam C. Woo. "Environmental Sustainability of Open-Pit Coal Mining Practices at Baganuur, Mongolia." Sustainability 12, no. 1 (December 27, 2019): 248. http://dx.doi.org/10.3390/su12010248.
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In this paper, we studied one of the largest coal mines in Mongolia, the Baganuur Coal Mine, in terms of environmental sustainability related to mining practices, with a focus on discharged water and waste sediments. The present quality and potential for future pollution were assessed. Based on World Health Organization and Mongolian guidelines, groundwater pumped from the mining operations could be used for drinking and domestic purposes. In addition, based on the Na absorption ratio, groundwater samples from GW-2 and GW-3 could be used as agriculture water supplies with salinity reduction, or used to grow halophytes as a measure for desertification control and pasture production. All waste soil samples appeared to have a desertification potential. Dust particles smaller than 150 μm comprised more than 80% of soil samples, which had arsenic levels higher than the Mongolian soil pollution standards. In addition, soil collected between coal seams (S-5) showed high sulphur content based on X-ray fluorescence (XRF) and scanning electron microscopy–energy dispersive X-ray (SEM-EDX) spectroscopy analyses, strong potential for producing acid mine drainage in the analysis of pH of net acid generation and net acid production potential, and potential for leaching of metals, such as Co. Therefore, the Baganuur Coal Mine requires soil pollution control measures to mitigate the risks of dust and desertification. In this perspective, mine groundwater could be used to reduce environmental stresses by supporting pasture crops such as halophytes on waste disposal sites, thereby preventing dust issues and desertification. Continuous efforts, including monitoring and enacting environmental management measures, are needed from both the mining company and the government to ensure sustainable mine development.
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Strbac Savic, Svetlana, Jasmina Nedeljkovic Ostojic, Zoran Gligoric, Cedomir Cvijovic, and Snezana Aleksandrovic. "Operational Efficiency Forecasting Model of an Existing Underground Mine Using Grey System Theory and Stochastic Diffusion Processes." Mathematical Problems in Engineering 2015 (2015): 1–18. http://dx.doi.org/10.1155/2015/610307.
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Forecasting the operational efficiency of an existing underground mine plays an important role in strategic planning of production. Degree of Operating Leverage (DOL) is used to express the operational efficiency of production. The forecasting model should be able to involve common time horizon, taking the characteristics of the input variables that directly affect the value of DOL. Changes in the magnitude of any input variable change the value of DOL. To establish the relationship describing the way of changing we applied multivariable grey modeling. Established time sequence multivariable response formula is also used to forecast the future values of operating leverage. Operational efficiency of production is often associated with diverse sources of uncertainties. Incorporation of these uncertainties into multivariable forecasting model enables mining company to survive in today’s competitive environment. Simulation of mean reversion process and geometric Brownian motion is used to describe the stochastic diffusion nature of metal price, as a key element of revenues, and production costs, respectively. By simulating a forecasting model, we imitate its action in order to measure its response to different inputs. The final result of simulation process is the expected value of DOL for every year of defined time horizon.
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Mpanza, Mbalenhle, Elhadi Adam, and Raeesa Moolla. "Dust Deposition Impacts at a Liquidated Gold Mine Village: Gauteng Province in South Africa." International Journal of Environmental Research and Public Health 17, no. 14 (July 8, 2020): 4929. http://dx.doi.org/10.3390/ijerph17144929.
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The windy season brings numerous community complaints for gold mining companies situated in the Witwatersrand due to windblown dust from partially rehabilitated tailings storage facilities (TSFs). For communities encroaching onto TSFs, windblown dust is perceived as a health hazard and an environmental challenge. In a study conducted in 2017 by the Lawyers for Human Rights, the community of a gold mine village perceived tailings storage facility 6 (TSF6) and other surrounding tailings storage facilities which are partially rehabilitated to be a health and socio-economic threat. Since 2013, when a nearby gold mining company was liquidated, this community has been complaining about dust fallout. To validate the claims made by the community this paper reports on the dust deposition impacts, and respiratory illnesses risk posed by wind-blown generated dust. The study conducts an air quality assessment using dispersion modelling of windblown dust. Surface material from the TSFs was sampled, analysed for silica and heavy metal content using X-ray fluorescence (XRF) and inductively coupled plasma-mass spectrometry (ICP-MS) respectively. This study finds that PM10 dust fallout, high in silica and uranium content, could potentially pose health threats to the surrounding community. The study further shows that dust deposition is the highest in July–October, with TSF6 posing a nuisance while TSF1 represents a potential health threat owing to its particle size distribution for the surrounding gold mine village community. Potential receptors of the air pollution by dust in this study area include neighbouring property owners, business owners of the nearby shopping centre, the school and the clinic. This study further finds that sudden mine closure due to mine liquidation results in unrehabilitated tailings storage facilities which exacerbates dust deposition.
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Bagatto, Giuseppe, and Joseph D. Shorthouse. "Biotic and abiotic characteristics of ecosystems on acid metalliferous mine tailings near Sudbury, Ontario." Canadian Journal of Botany 77, no. 3 (August 20, 1999): 410–25. http://dx.doi.org/10.1139/b98-233.
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INCO Ltd., a large mining company near Sudbury, Ont., deposits vast amounts of tailings on its property. These tailings contain elevated levels of Cu, Ni, and sulphides, and to curtail dust and acid drainage, INCO has undertaken a long-term project to cover its tailings with vegetation. Yearly amelioration of fresh tailings with limestone and fertilizer, followed by seeding with various grasses and herbs, transplanted conifers, and the later colonization of volunteer species of plants from adjoining forests, has resulted in the formation of ecosystems of varying age and complexity. To assess the long-term effectiveness of INCO's vegetation techniques, we studied floral diversity, attributes of developing soils, and the accumulation of Cu and Ni in various plant species growing on tailings at different stages of development. Habitat disturbance by tailings deposition, and its subsequent floral recolonizaton, is an example of "anthropogenic succession." Tailings that do not receive amelioration in the form of lime, fertilizer, and seeding remain free of vegetation, other than sparce clumps of the metal-tolerant grass Deschampsia caespitosa (L.) Beauv. Once amelioration begins, various species of grasses and herbs are able to subsist and within 8 years volunteer species begin to colonize. Substrate pH of dried tailings is less than 4 while the pH in upper horizons ranges from 5 to 6, increasing as the sites become more florally diverse; however, pH at lower depths remains less than 4. Substrate organic content in upper horizons at restored sites ranges from 4.5 to 5.0%. Water-soluble concentrations of Cu and Ni in upper horizons ranges from 1 to 5 µg/g dry mass, and 0.5 to 6 µg/g dry mass, respectively, and both metals decrease with increasing floral diversity. Levels of Ni increase at lower depths indicating greater substrate mobility. Levels of Cu and Ni are higher in plants from tailings than in those from control sites; however, concentrations do not decrease in plants from older and more florally diverse tailings sites. Root tissues contain significantly higher concentrations of Cu and Ni than aerial tissues. Monitoring air with moss plates indicates that dispersal of airborne metallic dust remains a problem.Key words: mine tailings, Sudbury, anthropogenic succession, copper, nickel, acid, monitoring.
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Masloboev, Vladimir, Sergey Seleznev, Anton Svetlov, and Dmitriy Makarov. "Hydrometallurgical Processing of Low-Grade Sulfide Ore and Mine Waste in the Arctic Regions: Perspectives and Challenges." Minerals 8, no. 10 (October 7, 2018): 436. http://dx.doi.org/10.3390/min8100436.
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The authors describe the opportunities of low-grade sulfide ores and mine waste processing with heap and bacterial leaching methods. By the example of gold and silver ores, we analyzed specific issues and processing technologies for heap leaching intensification in severe climatic conditions. The paper presents perspectives for heap leaching of sulfide and mixed ores from the Udokan (Russia) and Talvivaara (Finland) deposits, as well as technogenic waste dumps, namely, the Allarechensky Deposit Dumps (Russia). The paper also shows the laboratory results of non-ferrous metals leaching from low-grade copper-nickel ores of the Monchepluton area, and from tailings of JSC Kola Mining and Metallurgical Company.
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Mursyidin, Musyidin, and Husnul Warnida. "PERSEPSI MASYARAKAT TERHADAP DAMPAK KESEHATAN DARI AKTIVITAS PENAMBANGAN BATUBARA DI KAMPUNG TASUK KABUPATEN BERAU." Jurnal Ilmiah Manuntung 2, no. 2 (January 27, 2017): 120. http://dx.doi.org/10.51352/jim.v2i2.56.
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Mining is an ancient occupation, long recognized as being arduous and liable to injury and disease. Coal mining carried dangers from exposure to noise, heat, and airborne dusts, causing many associated diseases. Respiratory diseases caused by coal mine dust are pneumoconiosis, chronic bronchitis, and emphysema. The process of coal mining involves the discharge of huge amount of effluent into the surface water. Effluent from coal mine contains high load of TSS, TDS, calcium carbonate and heavy metals accumulates in water, soil, sediment and living organism. Coal mining has long been established in East Kalimantan. This paper explores the public perceptions of the health and environmental impact of opencast coal mining in Kampung Tasuk, Gunung Tabur, Regency of Berau, East Kalimantan. The obtained result may be used as an input to formulate and redesign the community development program of coal mining company in Berau. The public perception of coal mining activity in kampung Tasuk was dissastified with costumer satisfaction index 58.1
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Gligorić, Miloš V., Zoran M. Gligorić, Čedomir R. Beljić, Suzana M. Lutovac, and Vesna M. Damnjanović. "Long-Term Room and Pillar Mine Production Planning Based on Fuzzy 0-1 Linear Programing and Multicriteria Clustering Algorithm with Uncertainty." Mathematical Problems in Engineering 2019 (June 27, 2019): 1–26. http://dx.doi.org/10.1155/2019/3078234.
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Production planning in an underground mine plays a key activity in the mining company business. It is supported by the fact that mineral industry is unique and volatile environment. There are two uncertain parameters that cannot be managed by planners, metal price, and operating costs. Having ability to quantify and incorporate them in the process of planning can help companies to do their business in much easier way. We quantify these uncertainties by the simulation of mean reverting process and Itô-Doob stochastic differential equation, respectively. Mineral deposit is represented as a set of mineable blocks and room and pillar mining method is selected as a way of mining. Multicriteria clustering algorithm is used to create areas inside of mineral deposit that have technological characteristics required by the planners. We also developed a way to forecast the volatility of economic values of these areas through the planning period. Fuzzy 0-1 linear programming model is used to define the sequence of mining of these areas by maximization of the expected value of the fuzzy future cash flow. Model was tested on small hypothetical lead-zinc mineral deposit and results showed that our approach was able to solve such complex problem.
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Wittwer, Paul D. "Epithermal Precious Metal Deposits in South Korea—History and Pursuit." SEG Discovery, no. 125 (April 1, 2021): 19–26. http://dx.doi.org/10.5382/segnews.2021-125.fea-01.
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Abstract The gold and silver endowment of Korea has historically been well known, with records alluding to production as far back as 1122 BC. The main gold production period was from 1925 to 1943 during the Japanese occupation of Korea, with more than 1 Moz recorded in 1939. Muguk was the most productive gold mining operation, located within the central region of South Korea, with a recorded 590 koz of gold produced from 1934 to 1998 (first mined in AD 912). The majority of the historical mining operations were closed by government order in 1943 during the Second World War and never reopened. A number of small mines operated between 1971 and 1998, with limited production during a period of gold prices generally lower than at present (~25–50% of current inflation adjusted prices, apart from a four-year period 1979–83). It is likely that significant resources remain within these historical mining areas. Gold-silver deposit types historically recognized and exploited in Korea include placers and orogenic and intrusion-related vein systems. Only more recently have epithermal vein and breccia systems been recognized. This is not surprising, given that the geologic and tectonic setting of the Southern Korean peninsula is prospective for epithermal precious metal deposits, spatially associated with basin-scale brittle fault systems in Cretaceous volcanic terranes. South Korea is an underexplored jurisdiction, with limited modern exploration and drilling until the mid-1990s, when Ivanhoe Mines Ltd. discovered the Gasado, Eunsan, and Moisan epithermal gold-silver deposits, all of which became mines. Exploration was limited for another 20 years until Southern Gold Ltd., an Australian Securities Exchange (ASX)-listed company, commenced regional-scale exploration for epithermal deposits, using a strategy similar to that successfully employed by Ivanhoe.
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Stauber, Jennifer L., Rodney J. Benning, Leigh T. Hales, Ruth Eriksen, and Barbara Nowak. "Copper bioavailability and amelioration of toxicity in Macquarie Harbour, Tasmania, Australia." Marine and Freshwater Research 51, no. 1 (2000): 1. http://dx.doi.org/10.1071/mf99010.
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The 100-year operation of the Mount Lyell Mining and Railway Company Limited’s copper mine in Queenstown, Australia, has resulted in the deposition of over 100 million cubic metres of mine tailings, smelter slag and topsoil into the King River and Macquarie Harbour. Apreliminary risk assessment, together with chemical measurements of dissolved copper, ASV-labile copper, copper complexing capacity and resin-adsorbed copper, suggested that copper in mid-salinity harbour waters was potentially bioavailable. However, toxicity tests based on inhibition of microalgal (Nitzschia closterium) growth showed that copper in these waters was not toxic, even though labile copper concentrations (6–24 µg L−1) exceeded the concentration of lowest observable effect for algae of 5 mg L−1. Measurements of intracellular and membrane-bound copper confirmed that cell division was not affected because copper was not taken up intracellularly. Amelioration of copper toxicity was due to binding of dissolved organic matter and/or other metals at the cell membrane, preventing copper binding and uptake. An understanding of the mechanism of copper toxicity and its amelioration is vital to assessing various clean-up options for the harbour.
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Zerhouni, Youssef, Saida Alikouss, Najib Saber, Samiha Nfissi, Ghalem Zahour, Zouhir Baroudi, and Mohamed Samir. "Caractérisation Des Boues De Sucrerie Et Des Argiles Pour La Neutralisation Des Résidus Miniers Acides De La Mine De Kettara (Jebilet Centrales, Maroc)." European Scientific Journal, ESJ 12, no. 15 (May 30, 2016): 321. http://dx.doi.org/10.19044/esj.2016.v12n15p321.
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The minerals in the tailings, subject to the action of water and atmospheric oxygen, can generate Acid Mine Drainage (AMD). The latter is considered the most important environmental issue facing the mining industry. Its environmental impacts include the destruction of the flora and fauna in infected rivers and contamination of groundwater. The abandoned mine site Kettara, located about 32 km northwest of Marrakech (Morocco), chosen as a pilot site for this study, more than 3 million tons of tailings stored at ground level without any concern for their environmental consequences. These solid residues, with high concentrations of heavy metals (As, Pb, Fe, Cu ...), produce leachate very acidic (pH <2.9) may contaminate the water resources of the region. To mitigate the DMA phenomenon in this mining site, different protocols have been proposed using candy sludge (Mud Pulp Sweets: MPS), rich in carbonates from the Moroccan Sugar Company Unit (COSUMAR) and red clays (Clays: CLY) of the city of Safi. Physicochemical characterization and mineralogical of these two materials was performed an provided promising results regarding the effectiveness of the use of alkaline materials in the stabilization of tailings Kettara. Indeed, these starting materials are provided with a net neutralizing power which is of the order of 878.5 kg CaCO3 / t for MPS and 299 kg CaCO3 / t for CLY. The valuation of MPS and CLY, as a main component of an alkaline amendment, is likely to significantly reduce the effects of DMA in this semiarid climate mine.
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Andriani, Kiki, Nurini, and Rina Kurniati. "Implementation Of The Urban Forest Canopy Concept In Urban Forest Park Design, As An Effort To Rehabilitate Post-Mining Land Of Pt. Bukit Asam, Muara Enim, South Sumatera." E3S Web of Conferences 73 (2018): 04009. http://dx.doi.org/10.1051/e3sconf/20187304009.
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Mining industry activity has a positive and negative impacts on life.The positive impacts of the mine are to meet the needs of industry, energy and other things that are important to life. However, on the other hand, mining activities will lead to land degradation. The mining site needs major attention due to environmental damage caused. In addition to causing erosion and sedimentation, mining activities can lead to increase of heavy metal content in soils potentially entering the aquatic environment, decreasing the quantity and quality of water. Therefore, a repair or rehabilitation effort on post mining land is needed so as not to cause sustained damage. PT Bukit Asam in Muara Enim regency is one of the largest mining and mineral resource company in Indonesia. Recovery of land in PTBA is done by utilizing ex-mining land as urban forest as well as to increase recreation facilities in Muara Enim community. This study uses a data collection technique including field observations, interviews, documents review, narratives and questionnaires. The analysis used in the study include the analysis of natural physical conditions, users, activities and space requirements, site analysis, infrastructure analysis and Urban Forest Canopy Concepts. The results of this study are Urban Forest Park designs by applying Urban Forest Canopy Concepts.
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Jooste, Sandra, Susanna Levina (Sanlie L. ). Middelberg, and Merwe Oberholzer. "The relationship between debt levels and total shareholder return of JSE-listed platinum companies." Risk Governance and Control: Financial Markets and Institutions 6, no. 1 (2016): 7–13. http://dx.doi.org/10.22495/rgcv6i1art1.
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The purpose of this study is to investigate empirically whether there is a positive correlation between debt levels and total shareholder return (TSR) of platinum JSE-listed companies. The study field comprised annual analyses for 12 companies listed under the Platinum and Precious Metals sector on the JSE Ltd for the 14-year period 2000 to 2013. The results of the study were inconclusive as a statistically significant positive correlation between changes in debt levels and changes in TSR could only be found in two of these years. The core audience of the study will be the management of South African platinum companies considering changes in their capital structure, and investors considering investment in a listed platinum company. The contribution of the study is therefore to add to the body of literature on capital structure decisions from a South African platinum mine context.
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Gardic, Vojka, Jelena Petrovic, Lidija Djurdjevac-Ignjatovic, Srdjan Kolakovic, and Svetlana Vujovic. "Impact assessment of mine drainage water and municipal wastewater on the surface water in the vicinity of Bor." Chemical Industry 69, no. 2 (2015): 165–74. http://dx.doi.org/10.2298/hemind140128031g.
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Mining and copper production in Bor, in the past hundred years, had a huge impact on the environment of town, but also in a wide region. In the area of Bor, in the zone of Mining and Smelting Company (RTB) activity, over 29,000 ha of land under forests and fields is degraded. The area of degraded agricultural land in the Bor municipality is over 60% of total agricultural land. Wastewater, generated in the sites of RTB Bor, pollute the Bor River and Krivelj River, which still flow into the Timok River and Danube River. These pollutions are often presented by low pH value, increased content of heavy metal ions, suspended particles and fine particles of flotation tailings, which is deposited in the valleys of these rivers on the area of over 2000 hectares. During the decades of exploitation of ore from the open pit Bor at different locations ("Visoki Planir" - also called ?Ostreljski planir?, "Severni planir" dump of ore body "H" (RTH)) gangue and tailings were delayed. The largest amount of tailings, about 150 million tons, was postponed on location Visoki planir. The effect of the mining waste and the impact of the whole process of processing copper ore to the final products on the environment, was conducted during the 4th study period of the project "Management of mining waste-tailing dump in the Bor region," supported by the Japan Society for the Promotion Science (Eng. Japan Society for the Promotion of Science) and the Japan international cooperation Agency and the Ministry of environment, Mining and Spatial planning of the Republic of Serbia. Influence of season on the level of pollutants in soil and water, the impact on water quality in the river Timok and the River Danube, was conducted during first three periods of project. This paper presents the results of the third study period. The third period of research, which was conducted over a period of 17. 10. 2012 to 17. 01.2013 year, included a review of pollution sources and define their impact on the environment. The study included the following sources of pollution: mining waste and drainage water originating from the active mine (Bor pit , field 1 Krivelj large tailings, flotation tailings in Bor RTH, metallurgical water), as well as the drainage water from the flotation tailings, which are no longer in operation (field 2 flotation tailings Great Krivelj, drainage water from the old Bor flotation tailings), the old inactive landfill mine gangue (Saraka landfill, Veliki planir - tailings from the old Bor mine, landfill mine gangue from mine RTH) and the city - urban waste water, which are discharged without treatment directly into the watercourse Bor River. Wastewater directly pollute Bor River and Krivalj River.
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Sánchez, María Guadalupe Obregón, and Daniel Islas Reyes. "El Método LEST, Su Aplicación Y Evaluación En Las Prácticas Ergonómicas." European Scientific Journal, ESJ 12, no. 35 (December 31, 2016): 34. http://dx.doi.org/10.19044/esj.2016.v12n35p34.
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There exist many paths so as to carry out ergonomic modifications. Manuals, models and methodologies can be used in order to appropriately handle loads, the design of job positions, continuous physical movements, service areas; as well as the use of techniques for team work cooperation, among others. The subject-study company is a producer of rubber-metal parts for the automobile industry. It basically depends on the operational work of its employees. This makes it absolutely important to pay attention to the manner in which they perform their activities. Many companies pay great importance to the production system without keeping in mind the real needs of workers as they are doing their work. The subject-study company is in this very situation. This paper shows and approach to ergonomics applied to the Mexican industry. In Mexico, there is little evidence of the use of the LEST method. This is an attempt to take the first steps to carry out ergonomic evaluation with the intention of knowing the conditions under which employees are working within companies and organizations in order to provide them with better working conditions. The main aim of this research is to now the most incidental variables in the workplace that have an impact on the performance of employees so as to assess the impact of such incidences through the LEST method. Data was collected from 70 workers taking into consideration their surroundings, workload, mental strains, psycho-social aspects, work shifts, and a new variable that is not considered in the method proposed by the Polytechnic University of Valencia, or by the original method. The workers were asked in a section of the questionnaire: “What would you change about your working environment to improve it?” Through observation, we were able to clearly appreciate the physical movements performed by workers as they went along their physical activities at work while registering each and every one of them. Some of the workers were even filmed to observe the repeated movements they performed during their duties. This allowed us to carry out a more in-depth analysis of such movements. The Statistical Package for the Social Sciences (SPSS) tool was used so as to tabulate all of the input collected through the questionnaires answered by the employees. By doing so, it was possible to know the frequency at which the abovementioned incidences occurred, and so an interpretation of the data was carried out. Finally, the results or conclusions obtained through this study revealed that the company has major ergonomic differences between the workload and the work environment, specifically the thermal environment, the acoustic environment and the lighting in the workplace. These areas are closely connected with productivity. In general, the company must modify several aspects in the workplace such as their high staff turnover, as well as the full application of current norms, if the company wishes to grow into a leading company in its field.
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Richards, Paul G., Douglas A. Anderson, and David W. Simpson. "A survey of blasting activity in the United States." Bulletin of the Seismological Society of America 82, no. 3 (June 1, 1992): 1416–33. http://dx.doi.org/10.1785/bssa0820031416.
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Abstract Statistical information on chemical explosions is needed in seismology, to evaluate the practical difficulties in identifying this very common type of seismic source from other seismic sources such as small earthquakes and small nuclear explosions. We have obtained data on blasting activity from three different sources: (1) overview information from the U.S. Bureau of Mines (USBM) on the total amount of chemical explosives used in the United States during 1987, with breakdowns into different explosive types, and usage by different states; (2) overview information from the Mine Safety and Health Administration (MSHA) on the numbers of mines, of different types, in the United States; and (3) detailed information from a private company (Vibra-Tech Engineers, Inc.) on total shot size and size of charge per delay for 20,813 blasts carried out in 1987 at 532 locations. Our procedure has been to extrapolate the detailed information contained in the 1987 Vibra-Tech data for a limited number of states and thus to obtain estimates for the whole country on numbers of shots and their size distribution. The extrapolation is constrained by the data from USBM (numbers of shots, sizes) and the MSHA (locations). Blasting activity does not fluctuate greatly from year to year and 1987 was representative of current practice. We find that about 2.2 million metric tons of chemical explosive are used annually in the continental U.S., principally in mining for coal and metal ores. On a typical work day, there are roughly 30 explosions greater than 50 tons, including about one greater than 200 tons. There was one industrial explosion in 1987 at about 1400 tons. For shots between 1 ton and 100 tons, the cumulative distribution has a b-value near unity; that is, if N is the number of shots (per year) greater than or equal to W tons, N ∝ 10 − b log W = W − b with b roughly equal to 1. This result is similar to the size distribution of earthquakes greater than magnitude mb, N ∝ 10 − b m b . Almost all chemical explosions above 1 ton are ripple-fired. The typical shot uses 20 to 50 separate delays.
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Gomes, Maria da Conceição, Danilo Melo, Maíra da Costa, José Ângelo dos Anjos, Michael Trinta, and Itabaraci Cavalcante. "Análise geoquímica das águas subterrâneas no município de Boquira, no semiárido baiano - Brasil." Geochimica Brasiliensis 35, no. 1 (April 20, 2021): 7–16. http://dx.doi.org/10.21715/gb2358-2812.2021351007.
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The geochemical analysis was carried out in the center-south portion of the state of Bahia, in the semi-arid region of Bahia, where outcrop the Paramirim Complex, Boquira Unit, Boquira Granite, Veredinha Granite, Serra do Espinhaço, detritus coverings and alluvial deposits. The Boquira Unit is known for lead-zinc mineralization. In this unit operated the Boquira mine, considered the largest lead and zinc mine in Brazil, until it was suddenly abandoned, leaving significant environmental liabilities of toxic metals such as lead, zinc, silver, barium, copper, chromium and nickel. To characterize the groundwater 16 physical-chemical parameters from 24 wells were used, obtained from the Water and Sanitation Engineering Company of Bahia - CERB. Its classification was made in the Piper Diagram and the ionic relations in meq/L. To evaluate the quality of the water we used the Consolidation Ordinance no 5/2017 of the Ministry of Health and World Health Organization. With the PHREEQC 3.5 hydrochemical model, the saturation index of the analyzed elements was calculated. The results showed predominance of calcium chloride waters (71% of the samples), with ionic relations of type rCa2+> rMg2+>rNa+ and rCl->rHCO3->rSO42+. Geochemical modeling indicated calcite (CaCO3), dolomite (CaMg(CO3)2) and quartz (SiO2) as the main minerals with a tendency to precipitation. The first two were associated with the dissolution of the Boquira Unit carbonates and the third one with the quartzites of the Serra do Espinhaço Formation. The concentrations of calcium and chloride showed 54% and 25% of the samples above the Maximum Allowable Value for human consumption, respectively, representing a risk factor to the health of the population in the area.
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Hagni, Richard D., and Musa Karakus. "Cathodoluminescence Microscopy: A Valuable Technique for Studying Ceramic Materials." MRS Bulletin 14, no. 11 (November 1989): 54–59. http://dx.doi.org/10.1557/s0883769400061212.
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Over the past 10 to 20 years, cathodo-luminescence microscopy (CLM) has become an important, standard technique for studying many geological materials, but its application to ceramic material has not been fully realized. CLM has been found to be especially valuable in determining original porosity in carbonate rocks, a feature that was extremely important in determining the ability of petroleum and related fluids to migrate through the rocks and concentrate in the favorable structures where petroleum is found today. CLM constitutes one of the most significant techniques employed in the exploration for petroleum, but the results of those investigations remain largely unpublished in company files. A number of investigations have discussed the application of cathodoluminescence (CL) to studies of porosity in carbonates.Other applications of CLM to geology involve metals exploration. Halos of red CL feldspar in the rocks around carbon-atite deposits, which may contain rare earths, copper, and other metals, contrast with feldspar crystals with blue or blue-green CL that are distal from the ore deposits. Dolomite associated with lead-zinc ores may exhibit growth zoning by CL that can be used to trace the path of the ore fluids for distances of 100 miles or more. The detection of host rock limestone alteration in the Tri-State zinc-lead district, potassic and argillic alteration at the Henderson molybdenite mine, and ore guides in other metallic deposits by CL was discussed by Hagni.
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Brown, Alan S. "Under the Hood at GM." Mechanical Engineering 133, no. 10 (October 1, 2011): 28–33. http://dx.doi.org/10.1115/1.2011-oct-1.
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This article reviews various changes and developments that the General Motors’ (GM) management has brought after going bankrupt. According to a study, GM began to make plants more standardized and flexible years before Ford. Yet, Ford progressed faster because its centralized management was better able to make and implement decisions. GM needs to improve the speed of its decision-making. It plans to invest billions in United States and European manufacturing. It continues to expand in China, where it makes more vehicles than in the United States. GM’s plants focused on differentiating those things that gave its brands their character: sheet metal, power train, and interiors. Most importantly, GM began assembling every vehicle in every plant in the same sequence. The company has placed a large bet on the Volt, a plug-in electric car with an internal combustion engine. The combination means that the car is not limited to its 40-mile battery range. GM is making profits and succeeding now these days because it is building vehicles that customers want to buy, not vehicles they have to buy.
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Imasiku, K., and E. Ntagwirumugara. "Sustainable energy supply and business collaborations for sustainability, resilience and competitiveness in the Zambian copper industry after Covid-19." Journal of Energy in Southern Africa 32, no. 1 (February 22, 2021): 97–108. http://dx.doi.org/10.17159/2413-3051/2021/v32i1a8083.
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The mining industry in Zambia is energy-intensive, with hydro energy providing the required energy. But other sources of energy may need to be added, because hydro energy is subject to good rain patterns, threatened by the spectre of climate change, as already indicated by the current prolonged hours of load shedding by state-owned , Zambia Electricity Supply Company. This research looks at state-of-art mining technologies and collaborative business processes that leverage on the expected ramp in copper and cobalt (Cu-Co) global demand post-Covid-19, to help design resilient business systems by manufacturing, source goods and services within the Southern African Development Community (SADC) region to lower Cu-Co production costs, and maximise profits through shared resources and bilateral trade agreements. With evidence, projection and predictions by global leaders in the Cu-Co industry, this study evaluates the preparedness and resilience of the Zambian mining industry for sustainable energy supply, environmental sustainability, and suggests some possible business collaborations within the SADC region to share the following resources: metal refineries, transportation of goods and services, expertise and energy supplies within SADC, to enhance business sustainability. The study shows that the resilience of Cu-Co business in resource-rich nations like Zambia is complex and is heavily influenced by investment decisions, stakeholder interests, copper ore grades and extractive process types, reliable power supply, and socio-economic and political issues. The significance of this study is that it proposes some business collaborations within SADC that can increase energy reliability and supply, Cu-Co production, increase business resilience, improve global competitiveness and sustainability by exploring energy efficiency and generation-mix strategy.
Highlights
A sustainable energy analysis for Zambia.
Establishing the role of mine multi-national enterprises concerning environmental sustainability.
Proposing copper business resilience collaborations within SADC.
Developing a mining business resilience and sustainability model for sustainable power supply, high production, profitability and global competitiveness.
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Syafrizal, Syafrizal, Andika Satria Pradana, Ichwan Azwardi, Satyogroho Dian Amertho, Mohamad Nur Heriawan, and Arie Naftali Hawu Hede. "STUDI DISTRIBUSI MINERAL IKUTAN TIMAH (MIT) UNTUK MENDUKUNG METODA PENANGANAN SAMPEL PADA KEGIATAN EKSPLORASI." Prosiding Temu Profesi Tahunan PERHAPI 1, no. 1 (March 29, 2020): 797–806. http://dx.doi.org/10.36986/ptptp.v1i1.121.
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ABSTRAK PT. Timah Tbk merupakan perusahaan yang memiliki Izin Usaha Pertambangan (IUP) logam timah yang berencana menjadikan komoditas logam tanah jarang sebagai by-product dari ekstraksi logam timah sebagai komoditas utama. Telah diteliti bahwa Mineral Ikutan Timah (MIT) pembawa Rare Earth Elements (REEs) yang jumlahnya cukup dominan pada setiap sampel pemboran yang sudah dilakukan PT Timah Tbk diantaranya adalah ilmenite, rutile, zircon, monazite, xenotime, dan anatase. Eksplorasi terhadap logam timah terus dilakukan oleh PT Timah Tbk. Namun, eksplorasi khusus untuk setiap Mineral Ikutan Timah (MIT) pembawa Rare Earth Elements (REEs) hanya sebatas pada dokumentasi kadar mineral-mineral pembawa REEs pada sampel pemboran saja. Oleh karena itu, pada kesempatan ini, peneliti bertujuan untuk melakukan studi dan analisis distribusi mineral pembawa REEs untuk mencari aspek-aspek penting yang harus diperhatikan oleh PT Timah Tbk dalam merancang SOP (Standar Operasi Prosedur) preparasi hasil sampling eksplorasi yang tepat untuk ekstraksi mineral cassiterite tanpa mengabaikan kehadiran mineral pembawa REEs yang prospek untuk ditambang. Data-data yang digunakan peneliti berasal dari sampel-sampel primer, aluvial, konsentrat, dan tailing yang ada pada setiap daerah yang kemudian dilakukan kuantifikasi kadar mineral-mineral pembawa REEs dengan metode grain counting. Tahap selanjutnya adalah rekapitulasi, pengolahan data, dan penyajian data menggunakan metode-metode statistik. Lalu, akan dilakukan pembahasan, analisis, serta penarikan kesimpulan berdasarkan hasil pengolahan data yang menjawab rumusan masalah dan tujuan dari penelitian ini. Kata kunci : Mineral Ikutan Timah (MIT), Rare Earth Elements (REEs), Grain Counting, Standar Operasi Prosedur, Sampling Eksplorasi. ABSTRACT PT Timah Tbk is a state-owned company that has tin metal Mining Business License or well known as Izin Usaha Pertambangan (IUP) which plans to make rare earth metal commodities as a by-product of tin metal extraction as the main commodity. Based on research, REEs (Rare Earth Elements)-bearing minerals quite dominant in each drilling sample by PT Timah Tbk which are ilmenite, rutile, zircon, monazite, xenotime, dan anatase. Exploration of tin metal still continues by PT Timah Tbk. Nevertheless, the exploration of Rare Earth Metal (REM) is limited to the REEs-bearing minerals grade documentation in the drilling sample only. Therefore, on this occasion, writer aims to study and analyze the distribution of REEs-bearing minerals to look for important aspects that must be considered by PT Timah Tbk in designing the right SOP (Standard Operating Procedure) of exploration sample handling result for cassiterite mineral extraction without ignoring the presence of REEs-bearing minerals that are prospects to be mined. The data which used by the writer originated from primary, alluvial, concentrate, and tailing samples that exist in each region which then quantified the grade of REEs-bearing minerals using grain counting method. The next step is recapitulation, processing data, and presenting data using statistical methods. Then, discussion, analysis, and conclusions will be conducted based on results of data processing that answer the problem formulation and the purpose of this study. Keyword : By-product of tin metal extraction, Rare Earth Elements (REEs), Grain Counting, Standard Operating Procedure, exploration sample handling.
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Shao, Ai Jun, Shi Wen Wang, Lin Lin Chai, Qiang Wang, Ying Liu, and Song Yang. "Utilization of Coal Mine Water." Applied Mechanics and Materials 707 (December 2014): 202–7. http://dx.doi.org/10.4028/www.scientific.net/amm.707.202.
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China is a big country of coal production, in the coal mining process, the great massive mine drainage has caused not only the waste of groundwater resource, but also environmental pollution. On the other hand, mining production and life supply water is very scarce. According to the mine water features, the majority of mine drainage water belonging to the mine water containing suspended, the mine water needs to do the necessary purification then can be used. What the purification mainly eliminates is the suspended. In this paper, the method of purification and the technological process about mine water are discussed. The main methods of handling are coagulation, sedimentation, filtration and disinfection. According to different characteristics of water quality, different ways of handling and technological processes have to be chosen. Finally, the purification and utilization of mine water are shown through practical examples, Pingdingshan Coal Group Company, Wannian Coal Mine of Fengfeng Group Limited Company and Tangshan Coal Mine of Kailuan Group Company, to have obvious social, economic and environmental benefits.
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Mitovski, Aleksandra, Ljubisa Balanovic, Dragana Zivkovic, Sasa Marjanovic, Bata Marjanovic, and Sladjana Novakovic. "Structural and mechanical characteristics of some lead-free Cu-Sn based solder alloys." Chemical Industry 62, no. 3 (2008): 160–63. http://dx.doi.org/10.2298/hemind0803160m.
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The results of structural and mechanical characteristics of lead-free Cu-Sn based solder alloys, produced in Company "11. mart" AD Srebrenica (Republic of Srpska), are presented in this paper. The results of investigation of samples - alloys CuSnl4, CuSnlFelAlO.5, CuSnlOFelAllMnO.5 and CuA110Fe3Mn produced by different processing methods, include the data obtained by optical microscopy and measurements of hardness, micro hardness and electroconductivity, in order to characterize mentioned alloys and define the influence of processing method applied on their structural and mechanical properties. Microstructural experimental results of samples produced by casting in a metal mould with fast water cooling showed clearly sharp dendritic structure. Samples obtained by casting in a sand mould, displayed structure with big crystals, higher amount of segregation and inclusions on the grain boundaries, as a result of the slow cooling process. Hardness and microhardness tests showed increasing values as the amount of tin raised. Sample 3 showed the lowest value, as a result of the crystallization process and lackness of additional thermal treatment. Experimental results of the electroconductivity test showed that mentioned sample has got the highest value, which can be also explained by its production method. Results presented in this paper can contribute to investigations of copper-tin lead-free alloys, having in mind that various potential lead-free solders still haven't been completely investigated from the aspects of their structural, mechanical and electrical properties.
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MASLOBOEV, Vladimir, Dmitry MAKAROV, and Elena KLYUCHNIKOVA. "SUSTAINABLE DEVELOPMENT OF THE MINING COMPLEX OF THE MURMANSK REGION: MINIMIZATION OF MAN-MADE IMPACTS ON THE ENVIRONMENT." Sustainable Development of Mountain Territories 13, no. 2 (June 30, 2021): 188–200. http://dx.doi.org/10.21177/1998-4502-2021-13-2-188-200.
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The Murmansk region is a region with the largest enterprises of the mining complex of the Russian Federation: KF JSC “Apatit”, JSC “Kola MMC”, JSC “Olkon”, JSC” Kovdorsky GOK”, JSC” North-West Phosphorus Company”, LLC”Lovozersky GOK”. They provide the majority of the country’s demand for phosphate ores, zirconium raw materials (baddeleyite), niobium, tantalum, and rare earth metals. In addition, the mining and processing of copper-nickel, iron and chrome ores, nepheline and ceramic raw materials, facing stone and building materials is carried out. At the same time, the activities of enterprises have a very negative impact on the environment. The issues of environmental safety in the extraction and processing of minerals, storage of mining waste in the Arctic zone of the Russian Federation are of particular relevance. The definition of sustainable development in relation to the mining industry is given. The concepts of available best technologies, circular economy, and “green growth” are considered from the point of view of their contribution to sustainable development. It is shown that the sustainable development of enterprises at the present stage is impossible without improving the environmental friendliness of production. The article analyzes the legislation of the Russian Federation and the practice of its application to identify mechanisms that promote sustainable development and eliminate barriers to the implementation of this concept in the mining industry. New technological solutions have been developed for mining enterprises of the Murmansk region, aimed at reducing aero-technogenic emissions, cleaning waste (mine) water, processing tailings of enrichment as man-made deposits, which allows both to minimize man-made environmental impacts and to increase the full use of mineral raw materials. Thus, the expediency of using the principles of “green growth” for the development of economic development policies in the Arctic is justified.
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Shao, Ai Jun, and Zhi Guang Li. "New Technologies of Purification and Utilization on Mine Water." Applied Mechanics and Materials 178-181 (May 2012): 543–48. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.543.
Full textAbstract:
China is a big country of coal production, in the coal mining process, the great massive mine drainage has caused not only the waste of groundwater resource, but also environmental pollution. On the other hand, mining production and life supply water is very scarce. According to the mine water features, the majority of mine drainage water belonging to the mine water containing suspended, the mine water needs to do the necessary purification then can be used. That purification mainly eliminates is the suspended. In this paper, the method of purification and the technological process about mine water are discussed. The main methods of handling are coagulation, sedimentation, filtration and disinfection. According to different characteristics of water quality, different ways of handling and technological processes have to be chosen. Finally, the purification and utilization of mine water are shown through practical examples, Pingdingshan Coal Group Company, Wannian Coal Mine of Fengfeng Group Limited Company and Tangshan Coal Mine of Kailuan Group Company, to have obvious social, economic and environmental benefits.
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LEI, Liang-qi, Ci-an SONG, Xiang-li XIE, Yan-hong LI, and Fei WANG. "Acid mine drainage and heavy metal contamination in groundwater of metal sulfide mine at arid territory (BS mine, Western Australia)." Transactions of Nonferrous Metals Society of China 20, no. 8 (August 2010): 1488–93. http://dx.doi.org/10.1016/s1003-6326(09)60326-5.
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Dadaeva, E. "EVRAZ RASPADSKAYA COAL COMPANY: TABLET – FOR THE MINE, QUADCOPTER – FOR THE OPEN-PIT MINE." Ugol', no. 08 (August 8, 2018): 92–94. http://dx.doi.org/10.18796/0041-5790-2018-8-92-94.
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Liu, Ye Jiao, Zhi Chao Tian, Mei Han, and Yu Hui Ren. "Discussion on Application of PDCA Theory in Metal and Non-Metal Mine Safety Standardization Management System." Applied Mechanics and Materials 357-360 (August 2013): 2590–93. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.2590.
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The article introduces the concept of mine safety standardization, puts forward the ideas and theories that mine safety standardization management system should follow, analyzes the elements of metal and non-metal mine safety standardization and their PDCA mechanism and finally shows the establishment process of metal and non-metal mine safety standardization management system.
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Riekkola-Vanhanen, Marja. "Talvivaara mining company – From a project to a mine." Minerals Engineering 48 (July 2013): 2–9. http://dx.doi.org/10.1016/j.mineng.2013.04.018.
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Raymond, Gerald P. "Track and support rehabilitation for a mine company railroad." Canadian Geotechnical Journal 37, no. 2 (April 1, 2000): 318–32. http://dx.doi.org/10.1139/t99-108.
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The initial support and tie foundation problems of a railroad track built in 1974 to carry axle loads 21% greater than presently (1998) permitted under interchange laws at a speed of 88 km/h are presented. Some of the concerns related to and affecting the final rehabilitation that resulted in a final satisfactory performance are documented. The foundation engineer's interest is directed to the ballast, the tie, and to a lesser extent the rail's behaviour. Cobble-sized (75-150 mm) river gravel was used as the source for the ballast in the rehabilitation. The ballast's satisfactory performance has permitted the establishment of guidelines for future use of this type source of material where suitable quarried rock is not available. The railroad's satisfactory performance after rehabilitation has proven that the design concepts involving 36 t (40 tons) axle loads operating on 60 kg/m (119 lb/yd) continuously welded rail, concrete ties, and ballast manufactured by crushing from a river aggregate were achievable.Key words: railway track, concrete ties, ballast aggregate, aggregate, crushed face, rail, 36 t (40 tons) axle loads.
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Miličić, Mario, and Kristina Dundović. "A ventilation system in the Portuguese mining company Almina." Zbornik Veleučilišta u Rijeci 5, no. 1 (2017): 89–106. http://dx.doi.org/10.31784/zvr.5.1.7.
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In order to work in a mine, two main requirements have to be met - roof and ground support and ventilation support. Roof and ground support is important because in case of an accident, workers can, without problems, evacuate the mine. However, besides roof and ground support, in order to fulfill normal working conditions inside the mine, a ventilation system is a valuable and key part of the working process. This paper represents the ventilation system in the Portuguese mining company Almina. It encompasses a ventilation system in the underground and on the surface. The main problems of a ventilation system are discussed, as well as a short scheme of fresh air inhalation and stale air exhalation outside the mine. The result of the paper was to figure out how the ventilation system operates in practice. The aim of the paper was to present a real ventilation system by taking into consideration the fact that there are no mining companies in the Republic of Croatia where people could learn facts of mining companies and ventilation systems, which is very important in case of dangerous situations.
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Nakamura, K. "Biological Metal Removal from Mine Drainage." Journal American Society of Mining and Reclamation 1988, no. 1 (1988): 274–78. http://dx.doi.org/10.21000/jasmr88010274.
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Bétournay, Marc C. "Abandoned Metal Mine Stability Risk Evaluation." Risk Analysis 29, no. 10 (October 2009): 1355–70. http://dx.doi.org/10.1111/j.1539-6924.2009.01267.x.
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Guo, Jun, De Qing Gan, Jing Tan, and Chao Ren. "Mine Detection Technology in Mine Safe Production." Applied Mechanics and Materials 214 (November 2012): 558–61. http://dx.doi.org/10.4028/www.scientific.net/amm.214.558.
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Shirengou iron mine of Hebei iron and steel group Co., LTD owns annual production capacity of two million tons, which is one of the domestic major metal mines. The study of underground safety detection and monitoring system aims at realizing of mining safety and efficiency. This system prevents mine safety accidents effectively and improves mining production efficiently. The establishment of detection and monitoring system plays the significant reference meaning for promoting monitor of domestic mine pressure disaster and safe management level.
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Green, Heather. "State, company, and community relations at the Polaris mine (Nunavut)." Études/Inuit/Studies 37, no. 2 (June 23, 2014): 37–57. http://dx.doi.org/10.7202/1025709ar.
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Abstract Inuit employment in the mining industry has received very little attention from historians, although mining has been in the Arctic since the 1950s. Using the Polaris mine (1982-2002) on Little Cornwallis Island, Nunavut, as a case study, this article focuses on the Canadian government’s shift away from supporting mining developments in the late 1970s to early 1980s, on Inuit employment in the mining industry, and on the difficulties of Inuit from Resolute Bay in obtaining employment at Polaris. Previous to Polaris, the federal government saw Arctic mines, particularly Rankin Inlet (1951-1962) and Nanisivik (1976-2002), as a path to modernisation for the Inuit. However, as these earlier Arctic mines failed in this particular goal, the State became disillusioned and weary of providing financial support by the time Cominco began planning the Polaris mine in 1973. The federal government did not require Cominco to sign a formal agreement for Inuit employment, leaving the company responsible to develop its own hiring agenda. Unfortunately for the people of Resolute Bay, the company agenda did not include hiring locals as a priority, and bypassed and marginalised Resolute Bay Inuit who were keen on working at the mine. As mining has been the largest industry in the Canadian northern economy and is currently growing and beginning new development projects, it is important to understand the historical dynamics between mining companies, the State, and local communities.
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Kwon, Ho-Jang. "Lessons of Goseong Abandoned Metal Mine Accident." Korean Journal of Environmental Health Sciences 37, no. 5 (October 31, 2011): 335–41. http://dx.doi.org/10.5668/jehs.2011.37.5.335.
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PENG, Kang, Xi-bing LI, Chuan-chuan WAN, Shu-quan PENG, and Guo-yan ZHAO. "Safe mining technology of undersea metal mine." Transactions of Nonferrous Metals Society of China 22, no. 3 (March 2012): 740–46. http://dx.doi.org/10.1016/s1003-6326(11)61239-9.
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Ciszewski, Dariusz, and Urszula Aleksander-Kwaterczak. "Metal Mobility in a Mine-Affected Floodplain." Minerals 10, no. 9 (September 15, 2020): 814. http://dx.doi.org/10.3390/min10090814.
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The study attempted to map and predict the remobilization of metals in a floodplain which had been heavily affected by long-term Zn–Pb mining. This research, based on Zn, Cd, Pb, Ca and Fe speciation, mineralogy and the stratigraphy of sediments which had accumulated over the distance of a dozen or so km from the mine, revealed variable potential for metal mobilization. The results suggest that a drop in the water table, something to be expected after the closure of a mine, would be accompanied by a decrease in the pH of the river water and can induce the remobilization of metals associated with carbonates and exchangeable cations over the short-reach downstream of the mine. However, the mobilization of contaminants may be impeded by the alkaline, impermeable stratum of loams, which play a pivotal role in maintaining anaerobic conditions and buffering the acidity resulting from the partial degradation of sulfides. Based on the findings of the study, it can be expected that the intrinsic attenuation will limit the need for remediation works, although monitoring river water quality is recommended to determine the need for any intervention in cases where permissible quality values have been exceeded over a longer period. Results of this research can be useful as a reference for remediation works planned in other contaminated river systems experiencing water table lowering, where the mobilization of contaminants as a consequence of sediment oxidization can be expected.
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TAKAHASHI, Hiroyuki, Nobuyuki INOUE, Yuji KOMORI, Masakazu KONISHI, and Taichi MIZUE. "Medal Production Utilizing Urban Mine Collection Metal." Journal of the Japan Society for Precision Engineering 85, no. 1 (January 5, 2019): 19–22. http://dx.doi.org/10.2493/jjspe.85.19.
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Kubota, Hiroshi, and Ian Gordon. "Collapse in metal values: Related mine closures." Minerals & Energy - Raw Materials Report 13, no. 3 (January 1998): 29–30. http://dx.doi.org/10.1080/14041049809409140.
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Kang, Seon-Hong. "Metal recovery from mine tailings using bacteria." Waste Management 14, no. 8 (January 1994): 687–91. http://dx.doi.org/10.1016/0956-053x(94)90055-8.
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Tuomela, A., V. Pekkala, A. Rauhala, A. Torabi Haghighi, and P. Leviäkangas. "Frost susceptibility of Nordic metal mine tailings." Cold Regions Science and Technology 192 (December 2021): 103394. http://dx.doi.org/10.1016/j.coldregions.2021.103394.
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Patrick, Mukonki May, Muhota Kawinda Augustin, and Freddy Bokwala Bonkeka. "Strategic Mine Planning Approach Applied to Large Scale Copper open Pit Mines by Comparing The Impact of three Different Bloc Models of the Same Deposit, On the Long Term Mine Plan." International Journal of Advanced Research in Engineering 3, no. 2 (June 24, 2017): 1. http://dx.doi.org/10.24178/ijare.2017.3.2.01.
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The Kamoto Oliveira Virgule (KOV) open pit mine is located at 300Km from Lubumbashi, second largest city of the Democratic Republic of the Congo, in the mineral rich province of the Lualaba (EX-Katanga province).KOV pit is located 10Km south of the Kolwezi town and it is essentially constituted of sedimental rock, in a major portion of the so called “Lambeau Geologique de Kolwezi”, which is a part of the well-known copperbelt mineralization. In 2006, a joint venture of Glencore, Gecamines (the DRC State owned Company), and Simco, took over the open pit mine, which was previously owned by Gecamines, and formed the Kamoto Copper Company (KCC).KOV open pit mine is classified as a large scale open pit mine due to his dimensions (approximately 2.5km East-West and 3Km North-South).the mine has also a high strip ratio ranging from 8 to 10 in some areas. At his initial stage (Prefeasibility study), SRK released a bloc model which is still be used by the Kamoto Copper Company (KCC), but since the geology department addressed the issue about grade control model ore discrepancies, when comparing it to the SRK model, the management hired another contractor that constructed another bloc model. Internal adjustments using the grade control model data to better predict tonnes and grades have been also implemented but reported very poor results .since reserves have been officially reported to the market in 2014 to the TSX, the reserve report had to remain consistent with the 2014 report, despite that the issue has been fixed ,it still for a matter of interest to conduct a comparative analysis, to check on the impact of the other bloc model on the life of mine and the mine schedule .since we know by comparison that the other model (OBM) has a difference in its 3D distribution of ore and waste material. This paper will be focused on determining the impact on the life of mine and the mine schedule of the KOV pit with regards of those differences, between the bloc models.Index Terms: Mine planning, mine scheduling, mine optimization, life of mine, ultimate pit.
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Gonen, Alper. "Ventilation Requirements for Today's Mechanized Underground Metal Mines." International Journal of Advanced Research in Engineering 4, no. 1 (March 29, 2018): 7. http://dx.doi.org/10.24178/ijare.2018.4.1.07.
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Ventilation is a basic part of all underground mine operations. The main objective of underground mine ventilation is to provide sufficient quantities of air to all the working areas. Today, in modern mechanized underground metal mines, diesel-powered mobile equipment is extensively used for high production rates. Ore can be extracted from many production stopes due to the production rate in a mine. Amount of airflow required for an underground mine depends on several factors, including daily production capacity, number of diesel equipment, ambient temperature, mining method, mining depth and airway type. After implementation of Stage IV Emission Standards for nonroad diesel engines, it is getting more complex to determine airflow quantities required for underground mines wherefore reduced diesel emissions. Required amount of airflow for a mine is obtained by ventilation fans and the largest cost aspect in mine ventilation is the power costs of running the ventilation fans which can reach as high as 50 percent of a mine’s entire electrical power cost. The cost of electrical power has increased significantly in recent years and is likely to continue increasing in the future. That is why it is getting more important to determine proper ventilation design for underground metal mines.
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Wang, De Zhi, Guang Song, Shu Wang, and Jin Ying Gan. "Development of the Mine Production Management Information System." Advanced Materials Research 121-122 (June 2010): 364–67. http://dx.doi.org/10.4028/www.scientific.net/amr.121-122.364.
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The digital evaluation indexes of production management in mine can only be obtained from statistics and analysis of producing information, it can help high-level manager find problems existed in production system and make adjustment. Base on the requirement analysis of the Barun Mine Company production control information system, developed a C/S model of the system management system, which has been applied in the mine production.