The Hull–Rust–Mahoning Open Pit Iron Mine in Hibbing, Minnesota, United States,
is the World's largest operating open-pit iron mine. The pit stretches more than
three miles long, two miles wide, and 535 feet deep. It was established in 1895
and was also one of the world's first open-pit mines. And it is listed as a
National Historic Landmark.

This open pit iron ore mine is also known as the "Grand Canyon of the North"