Surface Coal Mine Mine Safety and Health Administration
The Black Thunder Mine is a surface sub-bituminous coal mine located 12 miles southeast of Wright, Campbell County, Wyoming. The mine opened in 1977 and is currently operated by Thunder Basin Coal Company, L.L.C., a subsidiary of Arch Coal, Inc. of St. Louis, Missouri. This mine is the second largest surface coal mine in the United States, with an average production of 175,000 tons per day