PolyMet Agrees to Sell US$20 Million of Common Shares to Glencore

HOYT LAKES, MINNESOTA -- (Marketwire - Nov. 30, 2011) - PolyMet Mining Corp. (TSX: POM) (NYSE Amex: PLM) ("PolyMet" or the "Company") announced today that it has entered into an agreement with Glencore AG ("Glencore") to sell in a private placement 13,333,333 common shares of the Company (the "New Shares") at US$1.50 per share for gross proceeds of US$20 million, before deducting offering expenses. Closing is subject to the receipt of regulatory approvals.

As part of the transaction, PolyMet agreed to issue to Glencore warrants to purchase 2,600,000 common shares of PolyMet at US$1.50 per share at any time until December 31, 2015, subject to mandatory exercise if the 20-day volume weighted average price of PolyMet shares is equal to or greater than 150% the exercise price and PolyMet provides notice to Glencore that it has received permits necessary to start construction of the North Met Project and availability of senior construction finance, in a form reasonably acceptable to Glencore. Following satisfaction of the conditions for mandatory exercise, if Glencore does not elect to exercise the warrants, the warrants will expire.

Approximately US$7.0 million of the proceeds from the sale of these shares will be used to repay outstanding notes (including interest) to Cliffs Natural Resources Inc. The balance will be for permitting and other costs (including general corporate purposes) associated with the NorthMet project.

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 Mining Corp. 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-and-a-quarter million hours of construction labor and create approximately 360 long-term jobs, a level of activity that will have a significant multiplier effect in the local economy.


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, 2011 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, 2011 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.



Contact Information

PolyMet Mining Corp. - Corporate
Douglas Newby
Chief Financial Officer
+1 (212) 867-1834
dnewby@polymetmining.com

PolyMet Mining Corp. - Media
LaTisha Gietzen
VP Public, Gov't & Environmental Affairs
+1 (218) 225-4417
lgietzen@polymetmining.com

PolyMet Mining Corp. - Investors
Crystal Agresti
+1 (845) 742-8153
cagresti@polymetmining.com

PolyMet Mining Corp. - Investors
Alex Macdougall
+1 (226) 663-3000
amacdougall@polymetmining.com
www.polymetmining.com