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July-August 2009

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Copper-bearing Fissure Veins

Keweenaw County, Michigan, Lake Superior Native Copper District

The Lake Superior native copper district, also known as the Michigan Copper Country, is located on the scenic, rugged, and isolated Keweenaw Peninsula, which juts out into Lake Superior at the western end of Upper Michigan. The native copper mines that comprised the district are strung out for approximately 90 miles along the outcrop of the Portage Lake Volcanics (PLV), which form a prominent, narrow, erosion-resistant spine traversing Ontonagon, Houghton, and Keweenaw counties.
Tom Rosemyer, a native of Upper Michigan, is a graduate of Michigan Technological University. He now spends summers in the San Juan Mountains and the Copper Country researching and writing articles on the mineralogy of the districts.

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