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Location: 7 km S from Carletonville, South Africa
PO Box 8044, Western Deep LevelsCarletonvilleSouth Africa2501
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The West Wits operation predominantly extracts tabular gold-bearing conglomeratic reefs, namely the Carbon Leader Reef (CLR) and Ventersdorp Contact Reef (VCR). The West Wits operations deposited CLR on Old North TSFs.The Witwatersrand Reefs occur within the Archean Witwatersrand Basin which hosts the Witwatersrand Supergroup succession. The VCR horizon is located at the top of the Turffontein Subgroup of the CRG, capping the Witwatersrand Supergroup. The VR horizon is situated within the Krugersdorp Formation, in the Johannesburg Subgroup of the CRG. The CLR is situated near the base of the Johannesburg Subgroup.The TSF material comprises previously treated residues of gold-bearing conglomeratic reefs processed by CIL. They are man-made “deposits” and are not the result of natural sedimentary processes. The grade of the TSFs is determined by the grade of the ore source at the time that they were processed, and the processing efficiency.MineralizationThe most significant mineral in the TSFs is quartz, which is above 60% of the bulk mineral composition. The gold predominantly occurs in pyrite. Other minerals identified are iron oxide, titanium oxide and calcite from the VR, VCR and CLR conglomerates.The gold present in the TSFs is fine grained, less than 20µm on average, with the majority of the gold being locked up with poor surface exposure.The main uranium mineral in the Witwatersrand Supergroup is uraninite. Uraninite grains are associated with gold and other heavy minerals such as pyrite, chromite, zircon, rutile. The grain size of the uraniferous minerals identified within the TSF are between 20 – 40µm.
