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Opper Mining In The Keweenaw Peninsula

Opper Mining In The Keweenaw Peninsula

Dec 18, 2018 Timeline of Michigan Copper Mining Prehistory to 1850. Partial serpent artifact made of Lake Superior copper found at Effigy Mounds National Monument, Iowa. The earliest known metalworking in North America begins when Native peoples start mining copper on the Keweenaw Peninsula. Digging pits and using heavy stones to break waste rock away from copper masses, they

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