 In July 2004, Arch Coal solidified its position as a leading producer of high-Btu, low-sulfur western bituminous coal with the acquisition of the remaining 35% interest in Canyon Fuel Company and its 161-million-ton reserves.In August 2004, Arch again expanded its position in the Powder River Basin with the acquisition of Triton's North Rochelle mine adjacent to Arch's existing Black Thunder operation.By integrating the North Rochelle mine with Black Thunder, Arch created the premier mine in the nation's fastest growing coal supply region.