MINNEAPOLIS (AP) -- The Minnesota Supreme Court has given a victory to environmentalists in the long-running battle over the proposed PolyMet copper-nickel mine in northeastern Minnesota.

The court on Wednesday sent the dispute back to the state Department of Natural Resources for further proceedings on whether the mine's waste pond would effectively keep pollution contained.

The Supreme Court also affirmed a 2020 decision by the Minnesota Court of Appeals to reverse the DNR's decision to grant PolyMet a critical ``permit to mine'' because the state agency failed to set a fixed term for the permit. It ordered the DNR to set an appropriate term.

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