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This is a pair of bookends made from copper ore mined on the Keweenaw Peninsula of Michigan. This native copper location is considered to be the most important as far as purity of the copper is concerned. Mining began here in 1845, producing copper until around 1982. In this time, over 7 million tons of refined copper were recovered from the Michigan copper mines. By the early 1900’s, these mines led the world in copper production, with “Lake Copper” becoming the comparative purity standard for
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