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Yellowknife, N.W.T. a study of its urban and regional economy /Bourne, Larry S. January 1963 (has links)
Thesis (M.A.)--University of Alberta, 1963. / Bibliography: p. [135]-149.
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Mexican silver and the enlightenmentMotten, Clement G. January 1950 (has links)
Thesis--University of Pennsylvania. / At head of title: The American Historical Association. Bibliography: p. 77-84.
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Considerations for stope gully stability in gold and platinum mines in South AfricaNaidoo, Kumendrie. January 2001 (has links)
Thesis (M.Sc.(Mining))--University of Pretoria, 2001. / Includes abstract in English. Includes bibliographical references.
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Gold and silver mining as a geographic factor in the development of the United States ...Hubbard, George D. January 1900 (has links)
Thesis (Ph. D.)--Cornell University, 1905. / Reprinted from Scott geog. mag., vol. XXVII (1911), pp. 417-26; 470-74. Bull. Phil. geog. soc., vol. IX (1911), pp. 1-22. Bull. Amer. geog. soc., vol. XLII (1910), pp. 594-602. Bull. Amer. geog. soc., vol. XLIV (1912), pp. 97-112. Scott geog. mag., vol. XXVI (1910), pp. 449-466. Bull. Phil. geog. soc., vol. X (1912), pp. 36-50. Jour. geog., vol. X (1912), pp. 316-319."
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Suction induced shear strength of gold mine tailingsWestraad, Delme. January 2004 (has links)
Thesis (M.Eng.)(Geotechnical)--University of Pretoria, 2004. / Includes summary. Includes bibliographical references.
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The optimum communications architecture for deep level gold miningMiller, Mark Henry Bruce. January 2000 (has links)
Thesis (M.Eng.(Electrical Engineering))--University of Pretoria, 2000. / Includes abstract in English. Includes bibliographical references.
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The Latouche mining method as used at the Alaska Juneau Gold MineGallemore, Willard Alexander, January 1938 (has links) (PDF)
Thesis (Professional Degree)--University of Missouri, School of Mines and Metallurgy, 1938. / Leaf number 26 was duplicated, constituting leaves number 26 and 26 1/2. The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed April 27, 2010)
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The environmental effects of the Yukon Gold Rush, 1896-1906, alterations to land, destruction of wildlife, and diseaseWillis, Bruce L. January 1997 (has links) (PDF)
No description available.
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The effects of a changing gold price on the South African gold mining industryRahn, Friedrich James 01 1900 (has links)
References appear at the end of each chapter / The importance of gold in the development of South
Africa as an industrialised economy cannot be over - emphasised.
Towards the end of the 19th century the economy depended almost
entirely on the production of gold and diamonds which laid the
foundation for a highly - developed national economy.
With gold still continuing to play an important
role coupled with the recent price increases, a need was felt
to investigate the potential effect of higher prices on gold
production in South Africa. For reasons set out in the study,
it was decided to compare potential out put for five different
gold prices. A gold price received by the mines of 050 per
ounce was used as abase. Further calculations were made at
060, 070, 0100 and 0150 per ounce.
The calculations for all the cases were done duri ng
the period when the Rand was floating with the Pound Sterling
and a Rand : Dollar parity of 1:1, 2 4 was used. Since then two
parity changes occured : the Rand was pegged to the Dollar on the 25th October, 1972 to give a Rand : Dollar parity of 1:1,27732, and
the Dollar was devalued on the 13th February, 1973 by
1 1,1 % to give the present Rand : Dollar parity of 1:1, 4192.
The e ffect of the above two parity changes is that
revenue in Dollar terms is overstated by 14,45 5%. It is
suggested that for purposes of this study the Rand figures be
accepted and wherever Dollars are used in future estimates
these be increased by the afore-mentioned 14, 455%. In Dollar terms the five Cases analised will change as follows:
Case A : 5350 becomes 057, 23 per ounce
Case B : 260 becomes 068, 67 per ounce
Case C : 270 becomes 080,12 per ounce
Case D : 0100 becomes 0114 ,46 per ounce
Case E : 0150 becomes 0171, 68 per ounce
To do an in-depth investigation into the effects of
higher gold prices on each individual mine, it was necessary
to analyse the various parameters required in the determination
of gold p r oduction, revenue, lease and tax payments , and
dividends.
For each mine the pay limits at the various gold
prices and at estimated working cost levels, were determined .
Graphs of the estimated tonnages at various pay limits as well
as the average grade of ore mineable at these limits were determined. From these graphs it is possible to obtain the
total tonnage mi neable at various pay limits. Once the foregoing
parameters were obtained for each mine, it was possible
to determine annual gold production, revenue, lease and tax
payments and amounts available to share holders which are
then summarised in tables and illustrated in graphs. For ease of
reference the mines were divided up into
geographica l areas. Gold production revenue, lease and tax
payments to the State and the amounts available to shareholders are
summarised and compared for the various gold prices. The summaries
show bold production remaining fairly constant at or just below
the present level of about 900 000 kilograms per year
until 1978 for Case A,
1979 for Cases B and C,
1983 for Case D, and
1984 for Case E.
before declining progressively thereafter.
Revenue following the same pattern as gold production for
Case A , as is to be expected, but
increasing to a peak of R1 466 million in 1977 for
Case B before progressively declining,
increasing to a peak of R2 434 million in 1982 for
Case D before progressively declining,
increasing to a peak of R3 478 million in 1983 for
Case E but remaining above the 1973 level of R1 254
million until the year 2005.
Lease and tax payments and amounts available to share-holders
following the same pattern as that indicated by
revenue reaching peaks of respectively
R390 million and R268 million for Case B
R485 million and R339 million for Case C
R756 million and R536 million for Case D
R1 000 million and R779 million for Case E.
Following the recent monetary unrest, gold prices
assumed for 1973 are too conservative. Should the present
gold price of about $80 and the 1972 level of production of
909 000 kilograms continue for the remainder of 1973, then
gold production, revenue, lease and tax payments and dividends
as shown for Case C for the year 1975 will be applicable for
1973. This shams gold production of 919 520 kilograms,
gold revenue of R 1690 million,
lease and tax payments of R465 million, and
dividends of R339 million.
The effect of the higher gold price can be clearly
seen when the fore-going figures are compared with the 1971
totals of gold production of 97 6,600 kilogr ams ,
revenue of R396 million from gold,
lease and tax payments of approximately R139 million, and
dividends of R142 million .
Despite a decline in gold production, revenue is expected to
be up by 8 9 % whilst lease and tax payments increase by 2 35%
compared with a dividend increase of 139%.
Finally certain tax concessions to
increase productivity and the rebuy alleviate the labour
shortage,
prolong the li ves of the mines by mining lower grade ore,
and
encourage exploration
was investigated and suggestions made. / Business Management / D. Com.
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An environmentally sound gold recovery process for small-scale gold miningBouwer, Wendy January 1999 (has links)
Thesis(MTech (Chem.Eng.Technology))--//Cape Technikon, 1999 / The gold mining industry has mainly relied upon the use of a highly polluting chemicals,
such as mercury and cyanide, to recover gold from its ores. As environmental legislation has become more stringent in all countries and environmental protection has become the focus of world-wide research, development of environmental sound processes has been favoured. The Coal Gold Agglomeration (CGA) process is such a process which was developed some years ago and has the advantage in that gold is recovered by a procedure which has little or no effect on the environment. The CGA process is based on the hydrophobic characteristics of coal, gold and oil. Gold particles which are substantially free become attached to the coal-oil agglomerates during collision, and eventually penetrate into the agglomerates. The resulting agglomerates are recycled to increase the gold loading, separated from the slurry, burnt, ashed and smelted to produce gold bullion. Laboratory scale batch tests were performed on an artificial/synthetic gold ore, containing fine gold powder. The slurry was contacted with a mixture of coal and oil. i.e. coal-oil
agglomerates, after which both the agglomerates and ore were analysed for gold. Operating parameters, such as the mode of contact between the coal-oil phase and the gold containing slurry, contact time of the slurry and the coal-oil phase, means of separating the coal-oil gold agglomerates from the slurry, coal to ore, coal to oil and water to ore ratios, type of oil, effect
of collectors and the mineralogy of the ore on the gold recovery were investigated.
Results have shown that stirring the coal-oil phase and the slug yielded higher gold loadings than shaking and the traditional rolling bottle technique. BI increasing the time of contact between the coal-oil phase and the gold slurry. the final gold loading in the agglomerates increases, until an equilibrium value is reached. An increase in the amount of coal, together with a decrease in the amount of water used in the slurry, has shown to increase gold recoveries. Furthermore, by varying the concentration and volume of a collector. such as potassium amyl xanthate (PAX) enhanced the settling rate and enabled the effectiveness of separation. Moreover, it was found that the gold loading on the coal-oil phase increased after
recycling it. Further tests were performed on a real ore sample and after X-ray Diffraction
(XRD) analysis, it was found that certain minerals other than gold was transferred to the coal-oil phase.
The theoretical foundation of the CGA process is based on the difference in free energy and
was expressed as a function of the interfacial tensions and three-phase contact angles between gold, oil and water, together with the ratio of coal-oil agglomerate to gold particle radii, as the free energy is a measure of the thermodynamic stability and hence, partly a measure of gold recoveries, meaningful predictions as to gold recoveries were made by performing a sensitivity analysis on the variables connected to the free energy, It was, however, found that
some operating parameters, which were linked to other factors, such as the maximum gold
transfer into coal-oil phase and the separation efficiency of the agglomerates. were vital to be taken into account when predictions as to gold recoveries were made. Therefore, the gold recoveries were found to be a function of the thermodynamic stability as well as the maximum gold transfer into the coal-oil phase and the separation efficiency of the agglomerates, The meaningful information gained by performing the theoretical investigations were applied and
linked to gold recoveries, thereby providing useful explanations as to the typical gold
recoveries obtained during experimentation.
A comparative study on mercury amalgamation was done to evaluate the performance of the
CGA process. It was found that the CGA process yielded better gold recoveries than
amalgamation, which makes it the better process both in terms of recoveries as well as environmental safety, A further application of the theoretical knowledge was, however, very useful to explain the tendency of the CGA process yielding the better results.
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