Stansbury managing director Randall Peterson told Associated Press his company had just completed the purchase from Rock Springs Royalty Co, a subsidiary of Anadarko Petroleum Corp.
The acquisition includes the mine assets, a coal lease, a surface-use license, mining permits and all other necessary coal-mining permits.
Stansbury said the mine will be re-named Little Patriot Mine and has a projected life span of more than 20 years. The high-Btu coal will be marketed domestically.