Black Thunder Coal Mine

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The Black Thunder Coal Mine is a surface coal mine in the U.S. state of Wyoming, located in the Powder River Basin which contains one of the largest deposits of coal in the world. Black Thunder is the most productive mine in the United States and one of the largest in the world. In 2006, the mine produced 92.7 million tons of coal[1], nearly 20% of Wyoming's total coal production, and higher than 23 other individual coal producing states[1].

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The mine was opened in 1977, and run by ARCO Coal until it was acquired in 1998 by Arch Coal[2]. For most of its existence, Black Thunder has been the largest mine in the country, but it was briefly surpassed by the nearby North Antelope Rochelle Mine. It regained the title again in 2004 after Arch Coal purchased the North Rochelle mine next door.

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