Open Pit Mines
2020-1-13The worlds biggest open pit iron mine can be found near Hibbing Minnesota. At its maximum the area covered by the Hull Rust open pit mine is five miles 8km long 2 miles 32km wide and 535 feet 180m deep. It looks like a man-made Grand Canyon of over 2000 acres 81km. The first iron ore extractions were made here in 1895.