The Antelope Mine is located in the southern end of the PRB, approximately 60 miles south of Gillette, Wyoming. The mine extracts thermal coal from the Anderson and Canyon Seams, with up to 44 and 36 feet, respectively, in thickness. Antelope mined and shipped 34.3 million tons of low sulfur, 8,889 Btu coal in 2012. Coal mined from Antelope is shipped primarily to electric utilities in the midwest, southwest and southeast United States.
Antelope Mine received two prestigious awards: the State of Wyoming Mine Safety Award in the Large Surface Mine category, and the Safe Sam Award, for safety performance records as the safest large mining operation and the safest coal mine in Wyoming during 2007 and 2008. Antelope was also awarded the Sentinels of Safety award in 2000 by the U.S. Department of Labor. The Sentinels of Safety is an award that recognizes the surface coal mine in the United States with the best safety performance for the year. Antelope was also recognized for the best safety performance in the U.S. in the surface coal mine category in 2000.
In 2003, 2009 and 2010 the Antelope Mine won awards from state and national organizations recognizing excellence in mine reclamation and wildlife stewardship.
Environmental Awards
| 2010 | National Excellence in Surface Mining and Reclamation from the Office of Surface Mining and National Mining Association for shrub development on reclaimed lands establishing wildlife habitat |
| 2010 | Wyoming Excellence in Surface Mining and Reclamation Award from the Wyoming Department of Environmental Quality for shrub development on reclaimed lands establishing wildlife habitat |
| 2009 | Wildlife Habitat Reclamation and Stewardship Award from the Wyoming Game and Fish Department for accomplishments in Mountain Plover habitat |
| 2003 | National Excellence in Surface Coal Mining and Reclamation Award from the Office of Surface Mining for prairie dog relocation project |
| 2003 | Wyoming Excellence in Surface Mining and Reclamation Award from the Wyoming Department of Environmental Quality for prairie dog relocation project |
| 2003 | Wildlife Habitat Reclamation and Stewardship Award from the Wyoming Game & Fish Department for prairie dog relocation project |
| 2003 | Pat Baumann, Antelope Mine, was named Habitat Conservationist of the Year by the Wyoming Wildlife Federation |
Safety Awards
| 2008 | Rio Tinto Chief Executive Safety Award |
| 2008 | Wyoming Governor’s Safety Award |
| 2008 | Wyoming State Mine Inspector Safety Award (Safe Sam Award) from the Wyoming Mining Association |
| 2007 | Wyoming Governor’s Safety Award, Large Category, for outstanding achievements in workplace safety and health |
| 2007 | Wyoming State Mine Inspector Certificate of Achievement for no lost time injuries |
| 2007 | Rio Tinto Chief Executive Award for most improved site |
| 2007 | Wyoming State Mine Inspector Safety Award (Safe Sam Award) from the Wyoming Mining Association |
| 2001 | Wyoming State Inspector Award for Safety Excellence by the Wyoming Mining Association |
| 2000 | Sentinels of Safety Award, Large Surface Coal Mine, by the U.S. Department of Labor |
| 2000 | Wyoming State Mine Inspector Safety Award (Safe Sam Award) for no lost time accidents |
| 1996 | Wyoming Governor's Safety Award |
| 1994 | Wyoming Governor's Safety Award |