PolyMet Issues Statement Addressing EPA's Filing on Section 401 Determination

The U.S. Environmental Protection Agency today filed a voluntary motion to remand its downstream water quality decision under Section 401 of the Clean Water Act, according to Poly Met Mining, Inc., a wholly owned subsidiary of PolyMet Mining Corp. (TSX: POM) (NYSE American: PLM) (together "PolyMet" or the "company"). The company issued the following statement in response:

The science shows that PolyMet's project has no downstream water quality effects. EPA has never said otherwise, but it did not make explicit findings when the issue arose in 2018 after the Minnesota Pollution Control Agency certified that the project will not affect the state's water quality. This 90-day remand gives it the opportunity to do so.

PolyMet plans to participate fully, as appropriate, in this process and believes the science will once again prevail. The science is clear that water discharges from the NorthMet copper-nickel-precious metals mine will have no impact on downstream waters.

Two weeks ago, a federal district court dismissed claims against EPA under Section 402 of the Clean Water Act. EPA's request for a voluntary remand today does not affect that dismissal.

* * * * *

About PolyMet

PolyMet is a mine development company that owns 100% of the NorthMet Project, the first large-scale project to be permitted within the Duluth Complex in northeastern Minnesota, one of the world's major, undeveloped mining regions. NorthMet has significant proven and probable reserves of copper, nickel and palladium - metals vital to global carbon reduction efforts - in addition to marketable reserves of cobalt, platinum and gold. When operational, NorthMet will become one of the leading producers of nickel, palladium and cobalt in the U.S., providing a much needed, responsibly mined source of these critical and essential metals.

Located in the Mesabi Iron Range, the project will provide economic diversity while leveraging the region's established supplier network and skilled workforce, and generate a level of activity that will have a significant effect in the local economy. For more information: www.polymetmining.com.

For further information, please contact:

Media
Bruce Richardson, Corporate Communications
Tel: +1 (651) 389-4111
brichardson@polymetmining.com

Investor Relations
Tony Gikas, Investor Relations
Tel: +1 (651) 389-4110
investorrelations@polymetmining.com

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, 2019, 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.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/76139

News Provided by Newsfile via QuoteMedia

The Conversation (0)
Copper globe.

Infographic: By-Product Credits Mask True Costs of Copper Mining

A widening two-dollar spread between the world’s cheapest and most expensive copper producers is exposing a growing vulnerability in the global supply chain. According to data by Mining Visuals, mining companies are failing to contain their core operational expenses, relying instead on high... Keep Reading...
Sunlit boardroom with a wooden table and leather chairs, large windows show a cityscape at sunset.

Former DHS Secretary Kristi Noem Joins NovaRed Mining

Vancouver-based junior explorer NovaRed Mining (CSE:NRED,OTCQB:NREDF) has appointed former US Homeland Security Secretary Kristi Noem as a strategic advisor, the company announced Tuesday (June 16).The company stated that Noem has joined the firm in a “strategic advisory role to support... Keep Reading...
Spools of copper wire.

Top 5 Junior Copper Stocks on the TSXV in 2026

Junior copper stocks are seeing significant support from the copper supply and demand story in 2026 as companies look to make the next big discovery of the red metal.Copper prices have been elevated throughout the first half of 2026 as supply constraints continue to evolve. Although disruptions... Keep Reading...
Nine Mile Metals Announces Completion of DDH WD-26-02,Intersecting 234.15 Meters of Visual Mineralization and Discovers a New Copper Rich VMS Horizon at the Wedge Mine

Nine Mile Metals Announces Completion of DDH WD-26-02,Intersecting 234.15 Meters of Visual Mineralization and Discovers a New Copper Rich VMS Horizon at the Wedge Mine

Nine Mile Metals LTD. (CSE: NINE,OTC:VMSXF) (OTCID: VMSXF) (FSE: KQ9) (the "Company" or "Nine Mile"), is pleased to announce that DDH WD-26-02 has been completed, logged, measured and zones of mineralization have been identified.DDH WD-26-02 was successful, intersecting base metal sulphides,... Keep Reading...
Copper ore with "5 Top Canadian Mining Stocks" text overlay.

Top 5 Canadian Mining Stocks This Week: Arras Minerals Swings With 69 Percent Gain

Welcome to the Investing News Network's weekly look at the best-performing Canadian mining stocks on the TSX, TSXV and CSE, starting with a round-up of Canadian news impacting the resource sector.On Wednesday (June 10), the Bank of Canada announced it would hold its benchmark interest rate at... Keep Reading...
Closeup of the end of many copper cylinders of varying sizes.

Top 5 ASX Copper Stocks in 2026

Copper prices have remained elevated through the first half of 2026, as supply chain disruptions continued to provide tailwinds for the red metal. The most significant disruption since the start of the year has been the US-led war against Iran, which has halted shipping through the Strait of... Keep Reading...

Interactive Chart

Latest Press Releases

Related News