Morenci Copper Mine, Arizona

Freeport-McCoRan operates this large, open pit copper mine and processing facility, often called the largest copper mine in North America (measured in total output, as Kennecott's Bingham Pit in Utah is larger in size). The mine has produced over 1 billion pounds of copper annually in some recent years. The Morenci Complex consists of three adjacent open pits and associated refining plants.