PolyMet Agrees to Sell US$30 Million of Common Shares to Glencore

HOYT LAKES, MINNESOTA -- (Marketwire) -- 11/12/10 -- PolyMet Mining Corp. (TSX: POM)(NYSE Amex: PLM) ('PolyMet' or the 'Company') announced today that it has entered into a definitive agreement with Glencore AG ('Glencore') to sell in a private placement 15 million common shares of the Company (the 'New Shares') at US$2.00 per share for gross proceeds of US$30 million, before deducting estimated offering expenses. Consummation of the sale of the New Shares and funding are expected to occur in the following three tranches subject, in each case, to certain closing conditions:

--  tranche 1 of US$10 million is expected to close no later than January
    17th, 2011;

--  tranche 2 of US$10 million is expected to close no later than October
    17th, 2011; and

--  tranche 3 of US$10 million is expected to close on the earlier of a)
    within ten business days following receipt by PolyMet of key permits, in
    a form reasonably acceptable to Glencore, that will enable the start of
    construction of the Project, and b) October 15th, 2012.

The New Shares offered and to be sold in the private placement have not been registered under the United States Securities Act of 1933, as amended (the 'Securities Act'), and may not be offered or sold in the United States absent registration under the Securities Act and applicable state securities laws or an applicable exemption from those registration requirements.

This notice is issued pursuant to Rule 135c under the Securities Act and shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of the New Shares in any state in which such offer, solicitation or sale, would be unlawful prior to the registration or qualification under the securities laws of any such state.

About PolyMet

PolyMet Mining Corp. (www.polymetmining.com) is a publicly-traded mine development company that controls 100% of the NorthMet copper-nickel-precious metals ore body through a long-term lease and owns 100% of the Erie Plant, a large processing facility located approximately six miles from the ore body in the established mining district of the Mesabi Range in northeastern Minnesota. PolyMet has completed its Definitive Feasibility Study and is seeking environmental and operating permits to enable it to commence production. The NorthMet project is expected to require approximately one million man hours of construction labor and create at least 400 long-term jobs, a level of activity that will have a significant multiplier effect in the local economy.

About Glencore

Glencore International AG, based in Baar, Switzerland, is a leading privately held, diversified natural resources company with worldwide activities in the smelting, refining, mining, processing, purchasing, selling and marketing of metals and minerals, energy products and agricultural products. Glencore AG, which maintains offices in Stamford, Connecticut, is a subsidiary of Glencore International AG.

POLYMET MINING CORP.

Joe Scipioni, President

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 our beliefs related to the expected proceeds and closing of the registered direct offering, exploration results and budgets, reserve estimates, mineral resource estimates, work programs, capital expenditures, actions by government authorities, including changes in government regulation, the market price of natural resources, costs, or other statements that are not a statement of fact. Forward-looking statements address future events and conditions and therefore involve inherent 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 PolyMet's most recent Annual Report on Form 20-F for the fiscal year ended January 31, 2010 and in our other filings with Canadian securities authorities and the Securities and Exchange Commission, including our Report on Form 6-K providing information with respect to our operations for the six months ended July 31, 2010 for a discussion of some of the risk factors and other considerations underlying forward-looking statements.

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

Contacts:

PolyMet - Corporate

Douglas Newby

Chief Financial Officer

+1 (646) 879-5970
dnewby@polymetmining.com


PolyMet - Media

LaTisha Gietzen

VP Public, Gov't & Environmental Affairs

+1 (218) 225-4417
lgietzen@polymetmining.com


PolyMet - Investors

Crystal Agresti

Investor Relations

+1 (845) 742-8153
cagresti@polymetmining.com
www.polymetmining.com