Nonferrous mining rules governing PolyMet Project are valid, not subject to further review after Minnesota Supreme Court denies opponents’ petition for review

Poly Met Mining, Inc., a wholly-owned subsidiary of PolyMet Mining Corp. (together “PolyMet” or the “company”) TSX: POM; NYSE American: PLM, reports the Minnesota State Supreme Court today declined to hear a petition for review by environmental groups to a lower court decision regarding the state’s nonferrous mining rules.

Environmental groups had petitioned the high court for review of a unanimous August 5, 2019 state Court of Appeals decision that upheld nonferrous mining rules administered by the Minnesota Department of Natural Resources.

“The state has some of the strictest environmental regulations in the country, and we’ve proven that we can meet those standards,” said Jon Cherry, president and CEO. “We are very pleased with this outcome.”

The Court of Appeals ruling covered an appeal filed in late 2018 seeking a declaration that the MDNR’s nonferrous mining rules are invalid. The Court of Appeals ruling and subsequent denial for review by the state Supreme Court means the decision stands.

Groups filing the petition were The Minnesota Center for Environmental Advocacy, Friends of the Boundary Waters Wilderness, Duluth for Clean Water, Friends of the Cloquet Valley State Forest, Save Lake Superior Association, Save our Sky Blue Waters, and Center for Biological Diversity.

About PolyMet

PolyMet Mining Corp. (www.polymetmining.com) is a publicly traded mine development company that owns 100 percent of Poly Met Mining, Inc., a Minnesota corporation that controls 100 percent of the NorthMet copper-nickel-precious metals ore body through a long-term lease, and owns 100 percent of the former LTV Steel Mining Company processing facility, located approximately seven rail miles from the ore body in the established mining district of the Mesabi Iron Range in northeastern Minnesota. Poly Met Mining, Inc. has completed its Definitive Feasibility Study and received key permits necessary to construct and operate the NorthMet Project. NorthMet is expected to require approximately two million hours of construction labor, create approximately 360 long-term jobs directly, and generate a level of activity that will have a significant multiplier effect in the local economy.

PolyMet Disclosures

This news release contains certain forward-looking statements concerning anticipated developments in PolyMet’s operations in the future. Forward-looking statements are frequently, but not always, identified by words such as “expects,” “anticipates,” “believes,” “intends,” “estimates,” “potential,” “possible,” “projects,” “plans,” and similar expressions, or statements that events, conditions or results “will,” “may,” “could,” or “should” occur or be achieved or their negatives or other comparable words. These forward-looking statements may include statements regarding the ability to receive environmental and operating permits, job creation, and the effect on the local economy, or other statements that are not a statement of fact. Forward-looking statements address future events and conditions and therefore involve inherent known and unknown risks and uncertainties. Actual results may differ materially from those in the forward-looking statements due to risks facing PolyMet or due to actual facts differing from the assumptions underlying its predictions.

PolyMet’s forward-looking statements are based on the beliefs, expectations and opinions of management on the date the statements are made, and PolyMet does not assume any obligation to update forward-looking statements if circumstances or management’s beliefs, expectations and opinions should change.

Specific reference is made to risk factors and other considerations underlying forward-looking statements discussed in PolyMet’s most recent Annual Report on Form 40-F for the fiscal year ended December 31, 2018, and in our other filings with Canadian securities authorities and the U.S. Securities and Exchange Commission.

The Annual Report on Form 40-F also contains the company’s mineral resource and other data as required under National Instrument 43-101.

The TSX has not reviewed and does not accept responsibility for the adequacy or accuracy of this release.

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