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The Mountain Pass rare earth mine is an open-pit mine of rare earth elements (REEs) on the south flank of the Clark Mountain Range, just north of the unincorporated community of Mountain Pass, California, United States. The mine, owned by Molycorp Inc., once supplied most of the world's rare earth elements. ==Geology== The Mountain Pass deposit is in a 1.4 billion year old Precambrian carbonatite intruded into gneiss, and contains 8% to 12% rare earth oxides, mostly contained in the mineral bastnäsite.〔Gordon B. Haxel, James B. Hedrick, and Greta J. Orris, ("Rare earth elements – Critical resources for high technology," ), US Geological Survey, Fact Sheet 087-02, 17 May 2005.〕 Gangue minerals include calcite, barite, and dolomite. It is regarded as a world-class rare-earth mineral deposit. The metals that can be extracted from it include: * Cerium * Lanthanum * Neodymium * Europium Known remaining reserves were estimated to exceed 20 million tons of ore as of 2008, using a 5% cutoff grade, and averaging 8.9% rare earth oxides. 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「Mountain Pass rare earth mine」の詳細全文を読む スポンサード リンク
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