Arch Coal, Inc. is a coal producer in the United States. The Company has three business segments: the Powder River Basin, the Western Bituminous region and the Central Appalachia region. During the year ended December 31, 2008, the Company operated 20 active mines located in each of the low-sulfur coal-producing regions of the United States. Arch Coal, Inc. sells substantially all of its coal to power plants, steel mills and industrial facilities. During 2008, the Company sold approximately 139.6 million tons of coal, including approximately 6.1 million tons of coal it purchased from third parties, fueling approximately 6% of all electricity generated in the United States.