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In October 2009, Arch acquired Rio Tinto's Jacobs Ranch mine and blended it with Black Thunder Coal Mine in the southern Powder River Basin of Wyoming, creating the single largest coal mining complex in the world.
In the early 1880s, many families began to migrate south to the Tongue River watershed area and established homesteads in the northern edge of the Powder River Basin, which they considered their natural home.
By 2006, the only active uranium mine in Wyoming was the Smith Ranch-Highland in-situ leaching operation in the Powder River Basin, owned by Power Resources, Inc., a subsidiary of Cameco.
Settlement began in the area near Wright in the 1970s, with the creation of the Black Thunder Coal Mine, the largest mine in the Powder River Basin and most productive mine in the United States.
Although ac traction motors are emerging for very heavy drag service, particularly in western North America, and its supply of Powder River Basin coal to other areas of the U.S., the simpler dc traction motor system remains the most popular, with Union Pacific alone having over 1,500 current model SD70Ms with dc traction motors (plus an additional 1,000 SD70MACs with ac traction motors).