The U.S. Department of the Interior issued a 20-year mining moratorium Thursday on 225,000 acres of federal land near the Boundary Waters, dealing a further blow to the proposed Twin Metals mine near Ely, Minn. and other potential mines for copper, nickel and precious metals within the watershed of the canoe wilderness area.
The decision is the latest milestone in a long and contentious tug of war over mining near the popular wilderness area that has spanned more than six years and three presidential administrations.