Dust Control In Underground Coal Mines
40 Leer Mine Aci Tygart Valley Underground West Virginia 4,274,748 41 Oaktown Fuels Mine No. 1 Sunrise Coal, LLC Underground Indiana 4,166,561 42 Prairie Eagle Underground Knight Hawk Coal, LLC Underground Illinois 4,095,032 43 West Elk Mine Mountain Coal Company, L.L.C. Underground Colorado 4,079,345 Subtotal 496,997,683.Underground mining is when the coal is farther underground, making it too expensive to remove soil. In this process, coal miners and all of the coal mining equipment are brought deep underground and coal is carried up out of the ground. This is especially dangerous because of fires, explosions, and poison gas in coal mines.