Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"Gold Mines"”.
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A stochastic model of the South African gold mines
A stochastic model of the South African Gold mines was constructed using Contingent Claims Analysis. This method allows the modelling of the major sources of uncertainty that the gold mines face, namely, uncertainty surrounding the future gold price, the exchange rate, the inflation rate, and the …
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Numerical Modeling Methodology for Weak Rock Masses in Nevada gold mines
Many Nevada gold deposits are found in highly fractured and faulted host rock with RMR ranging from 10 to 50. Various ground control design issues in weak rock masses are faced by most underground mines operating in Nevada. Numerical models complement field observations, instrumentation techniques, …
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Analysis of future carbon tax scenarios for South African gold mines
… design. Subsequently, carbon taxpayers, like gold mining companies, cannot plan for future carbon tax-related scenarios. The uncertainty regarding carbon tax policy changes needs to be reduced to assist South African gold mines with future carbon tax planning. This study investigated a variety …
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Unearthing the relationship between disease and causation in South African gold mines
… apply to an assessment of the liability of gold mining companies in South Africa and their failure to protect mineworkers from exposure to silicosis, silico-tuberculosis and pulmonary tuberculosis. It is argued that the Constitutional Court's interpretation, and their ultimate application of …
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Mercury Supply at Artisanal and Small-Scale Gold Mines in Africa: Actors, Distribution and Networks
… who are also embedded in the circuits linked to gold production at ASM sites. It is hoped that findings such as those reported here will help to stimulate a critical reflection on mercury management in the region’s ASM sector.
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Earthquake nucleation and rupture at a range of scales : laboratories, gold mines, and subduction zones
… observations, we studied data from five deep gold mines in the Far West Rand region of South Africa. These mines are seismically active due to daily underground blasting and record [approx.] 1000 events per day from -2 =/< M =/< 3+ close to their sources. Frequency-magnitude relations, …
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African labour problems on South African gold mines, with special reference to the strike of 1946
… the years the results of the policy of the gold mining industry and the paternalism of the Government, and thus the causes of the strike. My task was aggravated by the fact that many of the principles in this story were either not in the country or could not see me. In addition, records of …
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A Combined Energy–Exergy Approach for Improving Refrigeration Systems in Deep-Level Gold Mines: Method Development and Case Study Validation
… energy efficiency initiatives on deep-level mines. One of the major energy consumers on deep-level mines is the refrigeration system, which supplies chilled water for cooling the underground working environment. Due to the outdated nature of these systems, and their fixed supply capacities, …
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The influence of water composition on the pitting behaviour of newly developed corrosion resistant steels
… of the working stapes in South African gold mines has required the introduction of a fundamentally new technology, hydro-power, in which machines are powered hydraulically using mine water fed from above ground. Mine water is aggressive and has a variable acidity and pH, and contains …
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The influence of water composition on the pitting behaviour of stainless steel
… to be technically feasible in South African gold mines. Chilled mine service water is piped from the surface to deep level stope; where the hydrostatic pressure provides power for stoping machinery. This water varies widely in composition and acidity. High concentrations of sulphate, chloride …
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Lacustrine Arcellinida (Testate Lobose Amoebae) as Bioindicators of Arsenic Contamination: A new tool for Environmental Risk Assessment
Gold mining in northern Canada, while profitable, has left a legacy of arsenic (As) contamination, especially in lakes. Arcellinida, lacustrine benthic protozoans, have great As-biomonitoring potential that has yet to be exploited by lake restoration initiatives. This research aims to further …
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The Toxic Legacy of the Gold Rush
The California Gold Rush has often been told as a story of a brief, environmentally benign, even romantic ‘rush’ that ended as quickly as it began. In truth, gold mining in California was highly extractive and industrial, and continued well into the 20th century. Over time, miners developed …
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The development of abrasive-corrosive wear resistance of steels by microstructural control
… resistance in steels for applications in the gold mines of South Africa. A wide range of engineering steels, both commercially available and experimental, has been evaluated in laboratory simulated abrasive and abrasive-corrosive wear tests. An appraisal of the wear tests and the applicability …
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Numerical Modelling of Seismic Activity at Tabular Orebody Mines in South Africa using the Boundary Element Method
The deep gold mines that extract the tabular orebodies of the Witwatersrand Basin in South Africa are generally considered to have the highest seismic hazard in the world, and large seismic events at these mines often produce strong ground vibrations that pose risks of damage to mining excavations, …
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Gold-silver mineralization at the London-Virginia Mine, Buckingham County, Virginia
… in Buckingham County is one of several abandoned gold mines that are scattered throughout the polydeformed metavolcanic and metasedimentary rocks of the Virginia Piedmont. Production began at the London-Virginia in 1853 and continued intermittantly through 1939. Gold mineralization (averaging 1.2 …
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The Situational Analysis of Employees Resignation and their effect in Production in Mining Sector in Tanzania: A Case of African Barrick Gold
… by using the population of African Barrick Gold mines a subsidiary of Barrick Gold Cooperation. The general objective of the research was to determine the reasons which caused employees resignations at African Barrick Gold Mine in Tanzania. (Tulawaka, Bulyanhulu, Buzwagi and North Mara). The …
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Mammalian Sporothrix infections in southern Africa : researches on their development, dynamics and control
… the other type was found in the Witwatersrand gold mines due to fungal proliferation on the timber props underground, where the disease took on epidemiologic proportions in the early part of the century. Changes in the mining methods have almost eliminated the problem in the latter environment. …
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Socratic Encounters: Plato's Alcibiades
… around pedagogy. The Platonic dialogues are gold-mines of insight, but knowing this to be the case does not answer the fundamental question: 'What did Plato intend to teach us by writing Alcibiades Major?' The dissertation goes to great lengths to provide answers to the question, and the …
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Abrasion-corrosion and stress corrosion resistance of a 9Cr-2Ni-0.7Mo steel in simulated mine water
… the underground environment in South African gold mines. The results indicate that the alloy performs favourably in abrasive-corrosive applications, outperforming several other higher chromium containing steels which have been designed for the purpose. The alloy is also highly resistant to sec …
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