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Timeline Of Limestone Mining Tools

Dec 18, 2018 Timeline of Michigan Copper Mining Prehistory to 1850. Coltons 1872 Lake Superior Map ... Digging pits and using heavy stones to break waste rock away from copper masses, they fashion bracelets, beads, tools, fishhooks and other items for trade. Objects made of Keweenaw copper have been found in archeological sites across the continent.

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