Arch Coal is a coal producer and a producer of metallurgical coal. Co. sells substantially all of its coal to steel mills, power plants and industrial facilities. Co. operates several active mines. Co.'s reportable business segments are based on two lines of business, metallurgical coal and thermal coal, and may include a number of mine complexes. Co. reports its results of operations primarily through the following reportable segments: Metallurgical segment, containing its metallurgical operations in West Virginia, and the Thermal segment containing its thermal operations in Wyoming and Colorado.