Composition of gold grains in the Vaal Placer,Klerksdorp, South Africa |
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| Authors: | A. M. Reid A. P. le Roex W. E. L. Minter |
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| Affiliation: | (1) Department of Geology, University of Cape Town, Rondebosch, South Africa;(2) Present address: Department of Geosciences, University of Houston, 77004 Houston, TX, USA |
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| Abstract: | Separated gold grains from 94 samples of the Vaal Placer, Klerksdorp gold field, South Africa have been analyzed for Au, Ag and Hg. Average gold grain compositions in these samples range from 80 to 95 weight percent Au, 4 to 18 weight percent Ag and 0.5 to 4 weight percent Hg with an average composition around Au 90, Au 8, Hg 2. Individual grains are homogeneous but significant differences exist between gold grains from single small samples and also between average compositions in separate samples. The data do not fit any simple model of gold compositional control by provenance or by metamorphic homogenization. |
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