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Molybdenum mining in the United States produced 65,500 metric tons of molybdenum in 2014, worth US$1.8 billion. The US was the world’s second-largest molybdenum producer, after China, and provided 25% of the world’s supply of molybdenum. The US was a major exporter of molybdenum; net exports made up 48% of US production. Because most molybdenum is used as a steel alloy, demand for, and therefore the price of, molybdenum, tracks the demand for steel. As of the end of 2014, the United States had 2.7 million tons of molybdenum reserves, and 5.4 million tons of identified molybdenum resource.〔US Geological Survey, (Molybdenum ), Mineral Commodity Summary, 2015.〕 ==Molybdenum mines== Molybdenum is produced in the US from porphyry deposits of two types. The first class, which produces molybdenum as the primary product, includes molybdenum porphyry deposits. In 2014, three such molybdenum porphyry deposits were mined: two in Colorado and one in Idaho; the mine in Idaho was put into inactive status at the end of 2014. The second class, which produces molybdenum as a byproduct of copper mining, includes copper porphyry deposits. In 2014, byproduct molybdenum was produced at ten porphyry copper mines, in Arizona, Montana, Nevada, and New Mexico. Byproduct molybdenum from copper mines accounted for 47% of US molybdenum production in 2013. In both molybdenum porphyries and copper porphyries, the molybdenum is present as molybdenite. 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「Molybdenum mining in the United States」の詳細全文を読む スポンサード リンク
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