Alliance Resource Partners LP is a natural resource company, which produces and markets coal to United States utilities and industrial users. The company is headquartered in Tulsa, Oklahoma and currently employs 3,371 full-time employees. The firm operates through four segments: Illinois Basin Coal Operations, Appalachia Coal Operations, Oil & Gas Royalties and Coal Royalties. The Illinois Basin Coal Operation includes the Gibson County Coal, LLC mining complex; the Warrior Coal, LLC mining complex; the River View Coal, LLC mining complex and the Hamilton County Coal, LLC mining complex. The Appalachia Coal Operations include the Mettiki mining complex, the Tunnel Ridge mining complex and the MC Mining, LLC mining complex. The Oil & Gas Royalties includes oil and gas mineral interests held by AR Midland and AllDale I & II and includes Alliance Minerals' equity interests in both AllDale III and Cavalier Minerals. The Coal Royalties segment include coal mineral reserves and resources owned or leased by Alliance Resource Properties that are leased to its mining complexes in both the Illinois Basin Coal Operations and Appalachia Coal Operations.