Antelope Mine is located fifty-five miles north of Douglas, Wyoming in the south-central portion of the Powder River Basin. Rio Tinto Energy America acquired the mine in 1993 from Northern Energy Resource Company, a mining and natural resource company of PacifiCorp. Antelope Mine is now owned and operated by Cloud Peak Energy.

Antelope Mine is located at the south end of the Wyodak seam, the principal economic coal seam in the Wyoming portion of the Powder River Basin. Two different seams of the Wyodak are mined at Antelope: the Anderson and the Canyon. The Anderson coal seam is 44 feet thick and the Canyon coal seam is 36 feet thick. The coal's typical average quality is 8,850 Btu subbituminous thermal coal.

Antelope Mine utilizes a highly efficient combination of dragline open-pit operations with truck-shovel assist to produce significant volumes of coal each year.  In 2010, Antelope mined and shipped 35.9 million tons of coal.

The Antelope Mine full-time employee total was 526 at year-end 2010. The mine is permitted for production of 42 million tons of coal annually. Coal mined from Antelope is shipped primarily to electric utility customers 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

Safety Awards