Arch Coal, Inc. is a coal producer in the United States. During the year ended December 31, 2007, the Company operated 18 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 2007, the Company sold approximately 135 million tons of coal, including approximately 8.6 million tons of coal it purchased from third parties, fueling approximately 6% of all electricity generated in the United States. The locations of the Company's mines enable it to ship coal to coal-fueled power plants in the United States. During 2007, Arch Coal, Inc. sold approximately 73.6% of its coal under contracts with a term of more than one year. As of December 31, 2007, the average volume-weighted remaining term of its long-term contracts was approximately 3.8 years, with remaining terms ranging from 1 to 10 years.