The Gogebic Mineral Range is located in the western Upper Peninsula of Michigan and extends into neighboring Wisconsin. The iron mines in this range were among the deepest underground iron mines developed in the country. In 1906 the Norrie mine was considered the greatest iron mine in the world. The last operation, the Peterson mine, closed in 1967. Gold explorations were not commercially successful. Iron production on the Gogebic Range totalled 255 million tons.

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[Source: Dep¿t of Geological and Mining Engineering and Sciences, Michigan Technological University. Mineshafts of Michigan.Dep¿t of Geological and Mining Engineering and Sciences, Michigan Technological University. Mineshafts of Michigan. http://www.mg.mtu.edu/shaft3.htm. 2000.]