Thesis (M.A.)--University of Nevada, Reno, 2008. / "May 2008." Includes bibliographical references (leaves 133-141). Online version available on the World Wide Web.

Thesis (M.S.)--University of Nevada, Reno, 2008. / "May, 2008." Includes bibliographical references (leaves 144-146). Online version available on the World Wide Web.

Thesis (Ph.D.(Civil Engineering))--University of Pretoria, 2001. / Summaries in Afrikaans and English. Includes bibliographical references.

Based on the author's master's and doctoral theses--Stanford University. / Includes bibliographical references.

Thesis--University of Pennsylvania. / At head of title: The American Historical Association. Bibliography: p. 77-84.

Based on the author's master's and doctoral theses--Stanford University. / Includes bibliographical references.

Thesis (M.Soc.Sc. Publicy Policy)--University of Waikato, 2009. / Title from PDF cover (viewed Apr. 22, 2010). Includes bibliographical references (p. 102-109)

The gold mining fIrm in South Africa is viewed as a normal fIrm producing gold bearing ore but faced with a quality constraint (grade). Grade, however, is never uniformly distributed in a metalliferous deposit and because high grades are mined fIrst, the quality constraint becomes increasingly severe with cumulated production. The fIrm will continue to mine gold bearing ore until it reaches its mining limit where the marginal cost of recovering the gold is equal to the marginal revenue received from that gold and at that point the economic deposit becomes exhausted. Because the mining limit is determined by cost/technology and price, it is not fIxed and thus the point of economic exhaustion may change. When high grades are mined fIrst the relationship between the tonnage of gold ore and the grade describes the rate at which the grade is expected to fall with cumulated production. In this thesis, the grade for South African Witwatersrand gold producers is modelled to fall exponentially. The mining limit, determined by costs/technology and price, can be expressed in terms of grade. By predicting the decay in grade relative to the tonnage of gold ore and applying a mining limit, a life-time size of the economic deposit can be estimated. The remaining life of a producing gold mine can then be determined and the flow of gold predicted. An empirical treatment using the disk model of a gold deposit is undertaken for a gold mine, a goldfIeld and the total Witwatersrand gold deposit. A dynamic econometric analysis of expected mining costs and gold prices is not attempted; however certain examples are used to illustrate the applicability of the model and the influence of the South African gold mining tax formula on the life of the mine.

Thesis (MTech (Chemical Engineering))--Cape Technikon, 2000. / Internationally, there is an increase in the need for safer environmental processes that can be applied to mining operations, especially on a small scale, where mercury amalgamation is the main process used for the recovery of free gold. An alternative, more environmentally acceptable, process called the Coal Gold Agglomeration (CGA) process has been investigated at the Cape Technikon. This paper explains the application of flotation as a means of separation for the CGA process. The CGA process is based on the recovery of hydrophobic gold particles from ore slurries into agglomerates formed from coal and oil. The agglomerates are separated from the slurry through scraping, screening, flotation or a combination of the aforementioned. They are then ashed to release the gold particles, after which it is smelted to form gold bullion. All components were contacted for fifty minutes after which a frother was added and after three minutes of conditioning, air, at a rate of one I/min per cell volume was introduced into the system. The addition of a collector (Potassium Amyl Xanthate) at the start of each run significantly improved gold recoveries. Preliminary experiments indicated that the use of baffles decreased the gold recoveries, which was concluded to be due to agglomerate breakage. The system was also found to be frother-selective and hence only DOW-200 was used in subsequent experiments. A significant increase or decrease in the air addition rate both had a negative effect on the recoveries; therefore, the air addition rate was not altered during further tests. The use of tap water as opposed to distilled water decreased the attainable recoveries by less than five per cent. This was a very encouraging result, in terms of the practical implementation of the CGA process.

M.Sc. / The gold mining industry in South Africa is exposed to various legal issues due to the nature of its operations. Furthermore, there has been a renewed focus on environmental management in South Africa over the past decade, as well as an international focus on sustainable development. Environmental management in the gold mining industry must incorporate sustainable development, as well as the ‘cradle to grave’ concept. The gold mining industry has to ensure that its activities are compliant with environmental legislation and best practice requirements, as the increase in environmental awareness and legislated principles has escalated gold mines’ exposure to demands for the remediation and reparations of pollution and environmental degradation. No single document exists that provides the gold mining industry with detail on the environmental legislation and best practice requirements that gold mines are able to refer to in order ensure effective environmental management. Furthermore, there is no implementation plan for gold mines to implement in order to achieve compliance with environmental legislation and best practice requirements. This study has presented such a document, as it has provided the reader with detail concerning the responsibilities of the regulatory authorities, the current and new legislation, best practices, codes of practices, and offences and liabilities that gold mines will become exposed to should they not adhere to environmental legislative requirements. This detail has been used to compile an implementation programme (Chapter 4), which when implemented will ensure environmental compliance for the gold mining industry in South Africa. This mini-dissertation has thus provided the gold mining industry with an overview from which to work in order to become legally compliant with issues pertaining to environmental management in South Africa.