Ancient Copper Mining in the Upper Peninsula
A Marquette tour guide tells us about copper mining in the Upper Peninsula — which dates back 7,000 years at the Porcupine Mountains and Keweenaw Peninsula.
Source: mynorth.com
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A Marquette tour guide tells us about copper mining in the Upper Peninsula — which dates back 7,000 years at the Porcupine Mountains and Keweenaw Peninsula.