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| Coal in the United States ： ウィキペディア英語版 |
Coal mining in the United States
Coal mining in the United States is a major industry, and reached an all-time high of 1.06 Gt (1.17 billion short tons) in 2008, being mined in 25 states. The U.S. was a net exporter of coal in 2008, with the surplus of exports over imports equaling 4% of the total mined.〔F. Freme, "Coal review," ''Mining Engineering'', May 2009, p.50-60.〕 In 2010, coal exports increased to 7.5% of coal produced in the U.S.〔http://www.eia.gov/coal/production/quarterly/〕 As of 2013, while domestic coal consumption for power production was being displaced by natural gas, production for export to Asia from strip mines utilizing thick deposits in the western United States in locations such as the Powder River Basin in northern Wyoming and Southern Montana was increasing.
==History==
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