U.S.A. It's in Utah. You can see it from outer space.
I think it is the Lavendar Pit (copper mine) in Bisbee, AZ.
The Hull Rust Mahoning Mine is the largest open pit iron mine in Minnesota. It is located in the city of Hibbing, Minnesota. It is about 1.5 miles across and 3.5 miles deep.
The worlds largest open pit mine is the Kennecott copper mine in Utah. its is more than 2 3/4 miles across and more than 3/4 of a mile deep. The worlds largest mine? The Syncrude mine (the biggest mine in the world at 191 km2). Quite a bit larger than Kennecott.
One of the largest excavations in the world has been made by opencast mining at the Bingham Canyon copper mine in Utah, USA, measuring 790 m/2,590 ft deep and 3.7 km/2.3 mi across.
The world's largest diamond mine is located in Botswana. It is of open pit construction and the area of it makes it the world's largest diamond mine.
The largest open pit mine in the world is the Bingham Canyon Mine, located near Salt Lake City, Utah, USA. It is one of the largest man-made excavation in the world and has been in operation since 1906.
The world largest open pit mining is bingham Canyon Mine, it's 1,900 ares and 7.7 km2 and 2.5 miles deep!
The Super Pit, at Kalgoorlie, is Australia's largest open pit gold mine.
Gold is extracted from the Super Pit, in Kalgoorlie, which is the largest open pit mine in Australia.
The biggest mine in British Columbia is the Highland Valley Copper mine, located near Logan Lake. It is one of the largest copper mines in Canada and produces significant quantities of copper and molybdenum. The mine operates a large open-pit operation and has been a major contributor to the region's economy since it began production in the late 1960s.
Chuquicamata (Codelco) in Chile is the biggest open pit in the world, followed by Bingham Canyon near Salt Lake city. I believe the biggest planned pit could be at Olympic Dam in Australia, but is currenly only in planning stage.