Alliance Resource Partners LP a diversified natural resource company produces and markets coal primarily to utilities and industrial users in the United States The company operates through four segments Illinois Basin Coal Operations Appalachia Coal Operations Oil Gas Royalties and Coal Royalties It produces a range of thermal and metallurgical coal with sulfur and heat contents The company operates seven underground mining complexes in Illinois Indiana Kentucky Maryland Pennsylvania and West Virginia In addition it leases land and operates a coal loading terminal on the Ohio River at Mt Vernon Indiana and buys and resells coal as well as owns mineral and royalty interests in approximately 15 million gross acres of oil and gas producing regions primarily in the Permian Anadarko and Williston Basins Further the company offers various mining technology products and services including data network communication and tracking systems mining proximity detection systems industrial collision avoidance systems and data and analytics software As of December 31 2021 it had approximately 5471 million tons of proven and probable coal mineral reserves as well as 117 billion tons of measured indicated and inferred coal mineral resources in Illinois Indiana Kentucky Maryland Pennsylvania and West Virginia The company was founded in 1971 and is headquartered in Tulsa Oklahoma