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Here the volcanic crust fractured along the Keweenaw Fault becomes a dramatic, sheer rocky precipice. These cliffs loom over the Eagle River valley, which cuts through the Cliff Range at Phoenix and tumbles down to Lake Superior. In 1844, the Cliff Mine near Phoenix became first copper mine to earn big profits. North of here to the Keweenaw's tip at Copper Harbor, copper deposits were closer to the surface but in smaller amounts. Mining boomed in the 1840’s but soon played out.
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