Alliance Resource Partners, L.P., 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 owns and leases oil and gas mineral interests and equity interests; and leases its coal mineral reserves and resources to its mining complexes; and leases land and operates a coal loading terminal on the Ohio River at Mt. Vernon, Indiana. 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. It also exports its products. The company was founded in 1971 and is headquartered in Tulsa, Oklahoma.