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Historical Papers Research Archive, University of the Witwatersrand James Charles Napoleon Humphreys, Mining papers
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Underground plan shewing workings
Underground plan shewing workings
Van Ryn Deep, Ltd.
Van Ryn Deep, Ltd.
Underground workings of Main Reef and Main Reef Leader
Underground workings of Main Reef and Main Reef Leader
Government Gold Mining Areas, Ltd.
Government Gold Mining Areas, Ltd.
Underground plan of Main Reef Leader workings
Underground plan of Main Reef Leader workings
Underground plan of Upper Leader and Black Reef Leader workings
Underground plan of Upper Leader and Black Reef Leader workings
Underground workings
Underground workings
East Geduld Mines, Ltd.
East Geduld Mines, Ltd.
Grootvlei Prop. Mines
Grootvlei Prop. Mines
Sub Nigel
Sub Nigel
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