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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Uranium mining in Wyoming ： ウィキペディア英語版 Uranium mining in Wyoming Uranium mining in Wyoming was formerly a much larger industry than it is today. Wyoming once had many operating uranium mines, and still has the largest known uranium ore reserves of any state in the U.S. At the end of 2008, the state had estimated reserves dependent on price: 539 million pounds of uranium oxide at $50 per pound, and 1,227 million pounds at $100 per pound.〔US EIA, (Uranium reserves, 2008 ), 27 Sept. 2012.〕 The Wyoming uranium mining industry was hard-hit in the 1980s by the drop in the price of uranium. When the uranium price dropped, the uranium-mining boom town of Jeffrey City lost 95% of its population in three years. }} ==Powder River Basin== US Geological Survey geologist David Love discovered uranium in 1951 near Pumpkin Buttes, about 25 miles northeast of Midwest, Wyoming. Other deposits were found along a 60-mile northwest-southeast trend in the southwest part of the Powder River Basin, and production began in 1953. The deposits are roll fronts in fluvial sandstones of the Eocene Wasatch Formation and underlying Paleocene Fort Union Formation.〔Raymond E. Langden, ''Geology and geochemistry of the Highland uranium deposit'', Wyoming Geological Association Earth Science Bulletin, Dec. 1973, p.41-48.〕 The principal ore minerals are uraninite, coffinite, metatyuyamunite, and carnotite. Gangue minerals are calcite, gypsum, pyrite, iron oxide, and barite.〔Vernon A Mrak (1968) ''Uranium deposits in the Eocene Sandstones of the Powder River Basin, Wyoming'', in ''Ore Deposits of the United States 1933-1967'', New York: American Institute of Mining Engineers, p.838-848.〕 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「Uranium mining in Wyoming」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.