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ASARCO LLC is a mining, smelting, and refining company based in Tucson, Arizona, USA, that mines and processes primarily copper. The company is a subsidiary of Grupo México. Its three largest open-pit mines are the Mission, Silver Bell and the Ray mines in Arizona. Its mines produce 350 to 400 million pounds of copper a year. Asarco conducts solvent extraction and electrowinning at the Ray and Silver Bell mines in Pima County, Arizona and Pinal County, Arizona and a smelter in Hayden, Arizona. Before its smelting plant in El Paso, Texas was suspended in 1999 it was producing 1 billion pounds of anodes each year. Refining at the mines as well as at a copper refinery in Amarillo, Texas produce 375 million pounds of refined copper each year. Asarco's hourly workers are primarily represented by the United Steelworkers. Asarco has 20 superfund sites across the United States, and it is subject to considerable litigation over pollution. ==History== ASARCO was founded in 1899 as the American Smelting and Refining Company by Henry H. Rogers, William Rockefeller, Adolph Lewisohn, Anton Eilers and Leonard Lewisohn. From 1901-1958, American Smelting and Refining was a member of the Dow Jones Industrial Average. In 1901 Meyer Guggenheim and his sons took over the company. On January 11, 1916, sixteen Asarco employees were killed and mutilated by Pancho Villa's men near the town of Santa Isabel, Chihuahua. It was one of the incidents that sparked the Mexican Expedition, a United States Army attempt to capture or kill Villa. In 1975 it officially changed its name to Asarco Incorporated. In 1999 it was acquired by Grupo México, which itself began as Asarco's 49%-owned Mexican subsidiary in 1965, and on August 9, 2005, the company filed for Chapter 11 bankruptcy in Corpus Christi,〔(【引用サイトリンク】title=Newmont Mining, Form 10-Q, Quarterly Report, Filing Date Oct 28, 2005 )〕 Texas under then-president Daniel Tellechea. 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「Asarco」の詳細全文を読む スポンサード リンク
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