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The Red Dog mine is a zinc and lead mine located in a remote region of the Arctic, within the boundaries of the Red Dog Mine census-designated place in the Northwest Arctic Borough of the U.S. state of Alaska. The mine is the world's largest producer of zinc and has the world's largest zinc reserves.〔http://www.commerce.state.ak.us/oed/minerals/pub/InfoCirc_058Final.pdf〕〔(【引用サイトリンク】title=Plant Operation News: North America )〕 Red Dog accounts for 10% of the world's zinc production.〔(The Giant Red Dog Massive Sulfide Deposit ) Dr. David Leach. Pesquisador do USGS e Conferencista da Society of Economic Geologists〕 Red Dog accounted for 55% of the mineral value produced in Alaska in 2008.〔 In 2008 the mine produced 515,200 metric tons (507,100 LT; 567,900 ST) of zinc, 122,600 metric tons (120,700 LT; 135,100 ST) of lead, and 283 metric tons (9,100,000 ozt) of silver, for a total metal value of over one billion dollars.〔 At the end of 2008 the mine had reserves of 61,400,000 metric tons (60,400,000 LT; 67,700,000 ST) of zinc at a grade of 17.1% and 61,400,000 tonnes (60,400,000 LT; 67,700,000 ST) of lead at a grade of 4.5%, as well as significant additional zinc and lead in the less well-measured resource category.〔Teck Cominco, Annual Information Report, March 13, 2009〕 Red Dog is located on land owned by the NANA Regional Corporation and is operated by the commercial mining company Teck Resources in partnership with NANA Development Corporation.〔(Zinc Mining – Red Dog Mine ). Teck Cominco Ltd.〕 Ore concentrate taken from the mine is trucked westward to a shipping facility on the Chukchi Sea and stored there until the shipping season. The mine, which produces from an open pit, is currently mining the Aqqaluk orebody, immediately adjacent to the previous pit, Aqqaluk contains an additional 56 million metric tons (62 million short tons) of lead and zinc ore. The expansion is expected to keep the mine operating until 2031.〔''Environmental Protection Agency pulls approval of Red Dog water permit'', Mining Engineering, Nov. 2007, p.16.〕 ==History== In the mid-1950s, a bush pilot named Bob Baker noticed the stained creeks in the area and had a geologist do reconnaissance of the region. In 1968 a U.S. Geological Survey geologist sampled rocks and stream sediments in the area, including samples from the future site of the Red Dog mine, and named Red Dog Creek after the local pilot Bob Baker (Tailleur; USGS Open File 70-319).〔Tailleur; USGS Open File 70-319〕 In the mid and late 1970s, interest in the area from major mining companies and NANA intensified. In 1980 the Alaska National Interest Lands Conservation Act (ANILCA) became law and NANA officially selected the land underlying the deposits. Drill exploration of the deposits began in 1980, by Cominco American. In 1982 NANA and Cominco American (a mining company that had staked the land, and later became Teck Cominco) signed an agreement to develop the deposit. In 1986 the State of Alaska agreed to fund and take ownership of a road (DeLong Mts. Transportation System) from Red Dog to the coast, and a shallow-water port site. Also in 1986, residents of Kotzebue and 10 other area villages voted to form the Northwest Arctic Borough, to be economically based on taxing the Red Dog mine. Construction of the road, port site, and mine began in July 1987. Mine operations commenced in December 1989.〔''Alaska Resource Data File, USGS Open File 00-23, p.2.〕 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「Red Dog mine」の詳細全文を読む スポンサード リンク
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