
Hull–Rust–Mahoning Open Pit Iron Mine - Hibbing, Minnesota ...
The Hull–Rust–Mahoning Open Pit Iron Mine in Hibbing, Minnesota, United States, is the largest operating open-pit iron mine in Minnesota. The pit stretches more than 5 km long, 3 km wide, and 163 m deep was established in 1895 and was also one of the world's first open-pit mines