Arch Coal, Inc. is a coal producer, which sells all of its coal to power plants, steel mills and industrial facilities. The Company is engaged in the production of thermal and metallurgical coal from surface and underground mines located throughout the United States, for sale to utility, industrial and steel producers both in the United States and around the world. It operates mining complexes in West Virginia, Kentucky, Maryland, Virginia, Illinois, Wyoming and Colorado. The Company's segments include the Powder River Basin segment, with operations in Wyoming, and the Appalachia segment, with operations in West Virginia, Kentucky, Maryland and Virginia. The Company also sells coal from operations in Colorado and Illinois. Powder River Basin consists of Black Thunder and Coal Creek mines. The Company's mines in Appalachia include Coal-Mac, Lone Mountain, Mountain Laurel, Beckley, Vindex, Sycamore No. 2, Sentinel and Leer.