Mountain Coal Company, LLC: 5174 Highway 133, Somerset, CO 81434
Arch Coal’s Mountain Coal Company, L.L.C. operates the West Elk Mine located in Gunnison County, Colorado near the town of Somerset. Arch Coal, Inc. is one of the nation’s largest and most efficient coal producers. Its core business is providing U.S. power producers with cleaner-burning, low-sulfur coal for electric generation.