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Coal mining in Wyoming has long been a significant part of the state's economy. Wyoming has been the largest producer of coal in the United States since 1986. In 2013, there were 17 active coal mines in Wyoming, which produced 388 million short tons, 39 percent of all the coal mined in the US, and more than three times the production of second-place West Virginia.〔US EIA, (US Rankings - Coal ) accessed 19 May 2015〕 In 2011 Wyoming's coal mines employed 7,000 people; a high was reached in 1981 when 38,500 Wyomingites were recorded as being employed in the mining industry. Most of Wyoming's coal mines are in the northeastern part of the state, especially Campbell County. More than 88% of the state's coal production was contributed by mines in the northeast in 1996. Five ports in Washington and Oregon are considering building export terminals to ship coal to Asia, the coal would come from Wyoming and Montana and be shipped to the Northwest via train.〔http://earthfix.opb.org/energy/article/what-wyoming-coal-means-for-the-northwest-the-view/〕 Wyoming has 42 billion tons of reserve recoverable coal, and 1.4 trillion tons total that could become a reserve in the future. Most of the coal from Wyoming is sub-bituminous coal which burns at around 8400–8800 BTUs per pound. ==Disasters== On June 30, 1903 coal gas ignited in the Chimney Springs mine, killing 169 of the miners. In 1908, the same mine exploded again, trapping 18 miners inside. The state mine inspector and 40 other men entered the mine to rescue the miners, while the men were at work trying to rescue the miners, another explosion occurred, killing all 59 of those inside.〔http://uwacadweb.uwyo.edu/robertshistory/coal_safety_07.htm〕 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「Coal mining in Wyoming」の詳細全文を読む スポンサード リンク
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