A $2 billion cleanup in Lake Superior to address pollution from historical copper mining is still in the works. Stamp sands are a waste byproduct from processing copper, and off the Keweenaw Peninsula, they cover 1,426 miles of shoreline and lake bottom, partially suffocating a natural reef. A plan to dredge all stamp sands from the bay and truck the material to a nearby landfill is still in its early stages. Read the full story by WCMU – Mount Pleasant, MI.