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Location: 15 km SE from Welkom, South Africa
Randfontein Office Park, Corner Main Reef Road & Ward AvenueRandfonteinSouth Africa1759
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Material contained in the TSFs and WRDs originates from deep level gold mines, operated by Harmony and other mining companies. The mining operations predominantly extract narrow, tabular gold-bearing conglomerate reefs, namely the Basal, B, Elsburg, Dreyerskruil and Beatrix Reefs.These reefs occur within the Archean Witwatersrand Basin which hosts the Witwatersrand Supergroup succession. The Basal Reef is located at the base of the Harmony Formation, within the Johannesburg Subgroup of the Central Rand Group (“CRG”). The B Reef is part of the Spes Bona Formation at the base of the Aandenk Formation, within the Turffontein Subgroup of the CRG. The Beatrix Reef is part of the Earls Court Member of the Aandenk Formation, within the Turffontein Subgroup of the CRG. The Elsburg and Dreyerskruil Reefs occur within the Eldorado Formation of the Turffontein Subgroup, capping the CRG in the Free State Goldfield.The TSF material is the waste product of crushing, milling and gold extraction by carbon-in-leach (“CIL”) or CIP methods. As man-made deposits the TSFs are not the result of natural sedimentary processes. The grade of the TSFs is a function of the grade of the original reef sources, and the efficiency of the processing method at the time of treatment.The most significant mineral in the TSFs is quartz, which makes up more than 60% of the bulk mineral composition. The gold predominantly occurs in association with pyrite. Other minerals identified include silver, copper, iron oxide, nickel, bismuth, uranium, lead and zinc from the Basal, B, Elsburg, Dreyerskruil and Beatrix conglomerates.
