Minnesota regulators have concluded that state rules governing where copper-nickel mines can be built are insufficient to protect the pristine Boundary Waters Canoe Area Wilderness from noise and light pollution, creating another potential obstacle to the proposed Twin Metals mine in northeastern Minnesota. But the Department of Natural Resources declined as part of that decision Wednesday to declare a watershed that flows into the Boundary Waters off-limits to copper-nickel mining altogether, which had been a goal of the environmental group that challenged the regulations, Minnesota Public Radio reported. “We ... (full story)