Bingham Canyon Mine

"The Bingham Canyon Mine is an open-pit mine extracting a large porphyry copper deposit southwest of Salt Lake City, Utah, USA, in the Oquirrh Mountains. It is owned by Rio Tinto plc through Kennecott Utah Copper Corporation which operates the mine, a concentrator and a smelter. The mine has been in production since 1906, and has resulted in the creation of a pit over 0.75 mile (1.2 km) deep, 2.5 miles (4 km) wide, and covering 1,900 acres (7.7 km^2). According to Kennecott, it is the world's largest man-made excavation. Over its life, Bingham Canyon has proven to be one of the world's most productive mines. As of 2004, ore from the mine has yielded more than 17 million tons (15.4 Mt) of copper, 23 million ounces (715 t) of gold, 190 million ounces (5,900 t) of silver, and 850 million pounds (386 kt) of molybdenum. The value of these resources is greater than the Comstock Lode, Klondike, and California gold rush mining regions combined. Cumulatively, Bingham Canyon has produced more copper than any other mine in the world, although mines in Chile, Arizona, and New Mexico now exceed Bingham Canyon's annual production rate. High molybdenum prices in 2005 made the molybdenum produced at Bingham Canyon in that year worth even more than the copper. The value of metals produced in 2006 at Bingham Canyon was US$1.8 billion dollars. The mine is regarded as one of the most up-to-date integrated copper operations in the world, employing 1,400 people. The smelting and refining facilities are recognised as being among the world's best for environmental protection practice and achievement. The infrastructure required for an operation this size is impressive. 450,000 tons (408 kt) of material are removed from the mine daily. Electric shovels can carry up to 56 cubic yards (43 m³) or 98 tons (89 t) of ore in a single scoop. Ore is loaded into a fleet of 64 very large dump trucks which each carry 255 tons (231 t) of ore at a time, at a cost of approximately US$3 million per truck. There is a five mile (8 km) series of conveyors that take ore to the Copperton concentrator and flotation plant. The longest conveyor is 2.5 miles (4 km) long and passes through an existing railroad tunnel inside the mine. Rio Tinto committed US$170 million to the East 1 pushback project, which will extend the life of the open pit at Bingham Canyon until 2013. Various open-pit and underground alternatives will also be considered after that." -Wikipedia More info: http://en.wikipedia.org/wiki/Bingham_Canyon_Mine