Copper mining waste could help solve economic woes

An entrepreneur from Traverse Bay, Mich., and Michigan Technological University researchers are collaborating on a project to use Upper Michigan's stamp sand, an unsightly leftover from the mining era, for roofing shingles. Plans are to build a mill to process the stamp sand and supply it to the roofing industry. The mill will be near Gay, Mich., and will employ up to 40 people...

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