(December 6, 2023, 4:14 PM EST) -- HELENA, Mont. — The Montana Department of Environmental Quality (DEQ) Board of Environmental Review erred in upholding the approval of a permit to expand operations at a coal mine by declining to address certain arguments made by conservation groups and in making certain rulings regarding water quality violations and the cumulative impacts that would affect a creek near the mine the conservation groups say will be harmed by the expansion, the Montana Supreme Court found in remanding a trial court’s order....