PolyMet Mining Corp.: Minnesota Supreme Court Rules in Favor of PolyMet Air Permit St. Paul, Minnesota--(Newsfile Corp. - February 24, 2021) - The Minnesota Supreme Court today unanimously ruled in favor of the Clean Air Act permit issued to PolyMet by the Minnesota Pollution Control Agency, overturning an order by the state Court of Appeals that had remanded the permit back to the agency, according to Poly Met Mining, Inc., a wholly owned subsidiary of PolyMet Mining Corp. (TSX: POM) (NYSE American: PLM) (together "PolyMet" or the "company"). Rejecting the central legal argument relied on by opponents of PolyMet's project, the court ruled that the lower court had "relied on an erroneous interpretation of federal law" when it remanded the permit.