ミネソタ州北部の境界水カヌー地域の近くにある水と森林の近くに硫化物銅があります。現在、この地域で銅ニッケル鉱石の採掘を防ぐという目標を持つキャンペーンがあります。
There is sulfide-ore copper near the waters and forests close to the boundary water canoe area in northern Minnesota. Currently, there are campaigns with goals of preventing copper-nickel ore mining in the area.