The Bingham Canyon Mine or the Kennecott Copper Mine is the worlds largest manmade Hole. It is positioned in the southwest of Salt Lake City, Utah, USA, in the Oquirrh Mountains. It is over 0.75 miles (1.2 km) deep, 2.5 miles (4 km) wide and covering 1,900 acres (7.7 km²). It is so massive that it can be seen with the naked eye from space. The mine is owned by Rio Tinto Group, an international mining and exploration company headquartered in the United Kingdom. The copper operations at Bingham Canyon Mine are managed through Kennecott Utah Copper Corporation which operates the mine, a concentrator plant, a smelter, and a refinery. In 1966 the largest manmade Hole was designated a National Historic Landmark under the name Bingham Canyon Open Pit Copper Mine.
Mir Mine also known as Mirny Mine is the second manmade Hole in the world. It is positioned in Mirny, Eastern Siberia, Russia. The mine is 525 meters (1,722 ft) deep (4th in the world) and has a diameter of 1,200 m (3,900 ft). The suction above the hole resulted in several helicopter crushes, so all flight above the hole now is banned. Actually it is a former open pit diamond mine, but now inactive. The largest diamond of the mine was found on 23 December 1980 which weighed 342.5 carats (68 g).