Alliance Resource Partners, L.P. is a diversified energy company. It is engaged in the production and marketing of coal to domestic utilities, industrial users and international customers, as well as royalty income from oil & gas mineral interests located across the United States. Its segments include Illinois Basin Coal Operations, Appalachia Coal Operations, Oil & Gas Royalties and Coal Royalties. 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. Appalachia Coal Operations include the Mettiki mining complex, the Tunnel Ridge mining complex and the MC Mining, LLC mining complex. The Oil & Gas Royalties include oil and gas mineral interests held by Alliance Minerals as well as its equity interests in AllDale III. Coal Royalties segment includes coal mineral reserves and resources owned or leased by Alliance Resource Properties.