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Map of Minnesota bedrock by age. Shaded relief image: Superior Upland in the northeast, the flat Red River Valley in the northwest, Central Minnesota's irregular landscape, the Coteau des Prairies and Minnesota River in the southwest, and the southeast's dissected Driftless Area along the Mississippi River below its confluences with the Minnesota and St. Croix in East Central Minnesota
The Mesabi Iron-bearing District of Minnesota. U.S. Geological Survey Monograph 43. Washington, D.C.: United States Government Printing Office. Stacy, Francis N. (September 1904). "The Iron Mines That Give Us Leadership: The Most Extraordinary Deposits in the World in the Mesabi Range". The World's Work: A History of Our Time. VIII: 5235– 5243
The Duluth Complex includes much of Minnesota's Arrowhead Region north of Lake Superior.From the west near Duluth, Minnesota, it arcs north and northeast to about 48° north latitude south of Knife Lake, proceeds east at that latitude some five to twenty kilometers distant from and south of the Canada–US border to about 90° west longitude where it joins the border at the Pigeon River, and ...
The Longyear Drill Site is a historic mineral exploration site in Hoyt Lakes, Minnesota, United States.In 1890 the first core samples were taken there from what would become known as the Mesabi Range, one of the world's richest iron ore deposits.
Hibbing (pop. 16,361) is the largest city by area in the state of Minnesota. It is home to the Hull–Rust–Mahoning Open Pit Iron Mine, one of the world's largest open pit iron mines. Hoyt Lakes (pop. 1,888) is in the eastern Mesabi Range. Erie Mining Company previously mined ore and testing to mine new minerals is ongoing.
Minnesota Geological Survey via Minnesota Geologic Topics; select Bedrock Geology, then select Geologic Map of Minnesota's Bedrock Geology: Author: Mark A. Jirsa, Terrence J. Boerboom, V.W. Chandler, John H. Mossler, Anthony C. Runkel, and Dale R. Setterholm: Permission (Reusing this file)
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On the map, the Animikie Group is the dark gray northeast-trending belt which ranges from south-central Minnesota, U.S., up to Thunder Bay, Ontario, Canada. The Gunflint Iron Range is the linear black formation labeled G, the Mesabi Iron Range is the jagged black linear formation labeled F, and Cuyuna Iron Range is the two black spots labeled E.