 The first copper processing facilities were commissioned in 1987.By 31 December 2004, 8,896,577 tonnes of copper concentrate had been mined, containing 2,853,265 tonnes of copper metal and 7,035,477 ounces of gold metal, worth 12 billion US dollars at today's prices.In addition, between 1985 and 1990, 47.642 tonnes (1,680,553 ounces) of gold bullion was produced.