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・ Coal Mines (Minimum Wage) Act 1912
・ Coal Mines Act 1930
・ Coal Mines Historic Site
・ Coal Mines Provident Fund Organisation
・ Coal Mines Regulation Act 1908
・ Coal mining
・ Coal mining in Brazil
・ Coal mining in Chile
・ Coal mining in Colorado
・ Coal mining in India
・ Coal mining in Kentucky
・ Coal mining in Niger
・ Coal mining in Poland
・ Coal mining in the Black Country
・ Coal mining in the United Kingdom
Coal mining in the United States
・ Coal mining in Wyoming
・ Coal Mountain, Georgia
・ Coal Mountain, West Virginia
・ Coal Nunatak
・ Coal oil
・ Coal Oil Point seep field
・ Coal Palace
・ Coal pier
・ Coal pipeline
・ Coal Point, New South Wales
・ Coal Pool
・ Coal Porters
・ Coal power in the United States
・ Coal preparation plant


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Coal mining 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==
(詳細はウィキペディア(Wikipedia)

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