ST. PAUL, Minn. (AP) — The developers of a proposed copper-nickel mine near the Boundary Waters plan to use a potentially safer dry method of storing mine waste instead of the kind of wet tailings pond more common in the industry.
Twin Metals Minnesota said Thursday its underground mine near Ely would use “dry stack” storage for waste rock, calling it the most environmentally friendly approach for the site. The method contrasts with the conventional tailings basin at the planned PolyMet mine, which will be contained by an earthen dam.READ MORE: After More Remains Found, Adam Johnson's Family Pleads For Answers
While environmentalists pushed for dry stack storage at PolyMet, they’re criticizing Twin Metals because the waste would sit just a couple miles upstream from the Boundary Waters.READ MORE: What Is COVID's Delta Variant?
Twin Metals plans to release its formal mine plan in the coming months, triggering a lengthy environmental review.MORE NEWS: 'You Can't Find A New One': High Demand, Low Inventory Leave Boat Buyers Adrift
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