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PolyMet secures final state permit for NorthMet mine development in Minnesota

PolyMet Mining Corp. received the final state approvals to construct and operate the NorthMet copper-nickel-precious metals project in northeastern Minnesota.

The only remaining federal permit now required is a final decision from the U.S. Army Corps of Engineers on its wetlands (Section 404) permit, according to the Dec. 20 release.

The company's unit Poly Met Mining Inc. received the water and air quality permits and the Clean Water Act Section 401 water quality certification from the Minnesota Pollution Control Agency.

PolyMet received a permit to mine in early November, allowing it to build and operate open-pit mining operations, which are expected to yield around 1.2 billion pounds of copper, 170 million pounds of nickel, 6.2 million pounds of cobalt and 1.6 million troy ounces of precious metals over a 20-year mine life.