Alliance Resource Partners, L.P. produces and markets coal primarily to utilities and industrial users in the United States. It operates in two segments, Illinois Basin and Appalachia; and Other and Corporate. The company operates 10 underground mining complexes in Illinois, Indiana, Kentucky, Maryland, and West Virginia. It also leases land and operates a coal loading terminal on the Ohio River at Mt. Vernon, Indiana; and purchases and resells coal. In addition, the company provides mine products and services, including the design of systems for automating and controlling various aspects of industrial and mining environments; and design and sale of mine safety equipment, including its miner and equipment tracking and proximity detection systems. As of December 31, 2015, it had approximately 1.8 billion tons of coal reserves in Illinois, Indiana, Kentucky, Maryland, Pennsylvania, and West Virginia. Alliance Resource Management GP, LLC serves as the general partner of the company. The company was founded in 1971 and is headquartered in Tulsa, Oklahoma.