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The Toquepala mine is a large porphyry copper mine in the Tacna Province, Tacna Department, Peru. The mine is an open-pit mine producing copper, molybdenum, rhenium and silver with minor gold and zinc.〔http://www.mindat.org/loc-25368.html Mindat deposit info〕〔http://www.mineralmundi.com/toquepala-mine-10068788.htm Toquepala Mine〕 The Toquepala mine and the Ilo smelter were opened in 1960 by Southern Peru Copper Corporation, then a subsidiary of ASARCO. A Solvent extraction/electrowinning (SX/EW) facility was added in 1995.〔(Asarco company history )〕 ASARCO's stake in Southern Peru Copper, now 54.2%, passed to Grupo Mexico, when that company purchased ASARCO in 1999.〔(SPCC company history )〕 The mine and smelter are now operated by Southern Copper Corporation, a subsidiary of Grupo Mexico. In 2009, Toquepala produced about 127,000 tons of copper in sulfide concentrates, all smelted at Ilo, with a copper recovery of 97.4%. Toquepala also produced 38,000 tons of copper cathodes from the SX/EW plant.〔(SEC Form 10-K for 2009 ), p. 43-46〕 As of the end of 2009, Toquepala reported about 13 million tons of copper contained in proven and probable ore reserves, at an average grade of 0.47% Cu. The projected stripping ratio for this ore is about 2.6:1.〔(SEC Form 10-K for 2009 ), p.70〕 In October 2000, Ollanta Humala led an uprising with 50 mutineers who occupied Toquepala town for nine hours, taking four hostages. It was in protest at the corruption of Alberto Fujimori and his advisor Vladimiro Montesinos in their last days in power. Humala was left with just seven soldiers following a series of desertions. All hostages were freed, without bloodshed. ==Expansion== Toquepala is expanding its concentrator capacity in order to increase annual production by 100,000 tons of copper and 3,100 tons of molybdenum at a total capital cost of approximately $1.2 billion. Environmental Impact Assessment (EIA) studies for plant concentration and tailings deposit expansion were recently approved by Peruvian Ministry of Energy and Mining according to directorial resolution Nº611-2014-MEM/DGAAM given on Dec 17th 2014. This year, Geoservice Ingeniería and Walsh received mandates from Southern Copper Corporation, while the former is executing studies on surface, underground water resources and hydraulic infrastructure, the latest was in charge of executing the Environmental Impact Assessment studies for plant concentration and tailings deposit expansions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Toquepala mine」の詳細全文を読む スポンサード リンク
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