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n Civil Engineering = Siviele Ingenieurswese - Acid mine drainage Witwatersrand central basin : project : technical excellence category
Mining activities on the Witwatersrand exposed the underground geology - rich in pyrites - to oxygen and water, causing oxidation with the pyrite-bearing rock, forming acid mine drainage (AMD). When underground dewatering activities ceased, water levels in the mine basin rose, threatening to pollute rivers and streams if urgent action was not taken to mitigate the risk to people and the environment. The Department of Water and Sanitation directed the Trans-Caledon Tunnel Authority (TCTA) to implement an emergency solution. TCTA commissioned AECOM and its sub-consultant, Golder Africa Associates, to design and implement a short-term intervention (STI) solution for the AMD problem.
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