Court of Appeals requests additional information from MPCA on PolyMet air permit

Poly Met Mining, Inc., a wholly-owned subsidiary of PolyMet Mining Corp. (together PolyMet or the company) TSX: POM; NYSE American: PLM, issued the following statement regarding today’s Minnesota Court of Appeals decision remanding the air permit to the Minnesota Pollution Control Agency to provide more information.

We are disappointed in the court’s decision and are evaluating all legal options. We believe the Minnesota Pollution Control Agency in its permit appropriately accounted for the potential effects of the NorthMet Project. We stand ready to provide the additional information the agency might need to update its decision on the air permit. We demonstrated through the extensive environmental review and permitting process that we can meet or exceed Minnesota’s strict standards for nonferrous mines. This mine will provide much needed jobs to a region of the state known for its expertise in safe mining. We are continuing to move forward.

About PolyMet

PolyMet Mining Corp. (www.polymetmining.com) is a publicly traded mine development company that owns 100% of Poly Met Mining, Inc. (together “PolyMet” or the “company”), a Minnesota corporation that controls 100% of the NorthMet copper-nickel-precious metals ore body through a long-term lease. The project features significant assets including the deposit itself and infrastructure including existing rail, roads and utilities that connect the ore body to the plant site approximately seven rail miles away. The project is located 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 permits that provide authorization to build and operate an open pit mine and associated processing facilities. The permits, however, are the subject of ongoing litigation. NorthMet will take advantage of the region’s established supplier network and skilled workforce, is expected to require approximately two million hours of construction labor, will 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.

For the purposes of TSX approval, the company relied on the exemption set forth in Section 602.1 of the TSX Company Manual, which provides that the TSX will not apply its standards to certain transactions involving eligible interlisted issuers on a recognized stock exchange, such as the NYSE American.

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

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