Gold Fields sprays chemicals over some of the ore extracted at Tarkwa to liberate gold in a low-cost process known as heap leaching. The plant, 185 miles west of the capital, Accra, accounted for 28 percent of the mine’s 717,000 ounces of 2011 production. Tarkwa is Gold Fields’ second-largest mine by output after the Kloof-Driefontein complex in South Africa, and has the third-lowest costs of all its operations.
Ghana’s EPA ordered the company to stop discharging water from the heap-leach site and to build treatment plants to reduce conductivity levels, the company said. Gold Fields will build the plants by the end of the year, it said.
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