Alliance Resource Partners, L.P., a diversified natural resource company, engages in the production and marketing of coal 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 bituminous coal from its underground mines sold to electric power generation and the steel production customers. 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. Alliance Resource Partners, L.P. was founded in 1971 and is headquartered in Tulsa, Oklahoma.