Iron is the most abundant elements on earth — and one of the largest deposits of iron ore in the United States is located in Minnesota. The open-pit Minorca Mine, located about 60 miles north of Duluth, processes more than 10 million tons of ore per year. Learn how such a large deposit ended up in this location and about the process it takes to refine the ore. The Minnesota mine is first shown at the 3:25 minute mark.
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