valley of the ancient copper mines

Missing: Prehistoric Michigan’s Half-Billion Pounds of Copper- valley of the ancient copper mines ,Missing: Prehistoric Michigan’s Half-Billion ... The ancient copper mines may be the first evidence that ... Prehistoric Michigan’s Half-Billion Pounds of ...BBC - Earth - The ancient copper mines dug by childrenThe ancient copper mines dug by children . Thousands of years before the Industrial Revolution, people were mining for metal on an industrial scale . Share on Facebook.