 Date: 2015-01-03 07:56:05Geography of Montana Geography of Wyoming Geology of the Rocky Mountains Powder River Basin Coal mining Belle Ayr Mine Coal Jacobs Ranch Black Thunder Coal Mine Wyoming Economic geology Mining in the United States | |  Successful Competitive Lease Sales Since 1990, Powder River Basin, Wyoming LBA Name Jacobs Ranch West Black Thunder North Antelope/Rochelle West Rocky Butte
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