The Mine Waste Solutions (MWS) project is located near Stilfontein, South Africa within the Witwatersrand Basin. MWS is a gold and uranium tailings reprocessing operation that processes slurry material, reclaimed hydraulically from various tailings storage facilities through three processing plants. The gold plants have the capacity to treat approximately 26 Mt per annum and the uranium plant has a design capacity of 1.2 Mt per year.
The gold and uranium in the tailings at MWS occurred within conglomerate reefs that were mined at the now closed Stilfontein and Buffelsfontein gold mines. The facilities also include a modern tailings storage facility approximately 15 km from the gold plant modules where residues from the treatment plants are deposited.
Production at MWS was 109 kozs of gold in 2017, 18% higher than in 2016. The increase was due to the improvement in feed grades from the Sulphur Paydam and East tailing storage facilities, coupled with improved recoveries.