GLENCORE AG November 28, 2008

Exhibit 99.11

GLENCORE AG

November 28, 2008

Xxxxxxx Xxxxx

Poly Met Mining Inc.

0000 Xxxxxxx Xxxx 000

Xxxx Xxxxx, Xxxxxxxxx

Xxxxxxx,

Sub: Executed Consent from Cleveland Cliffs

The undersigned (the “Purchaser”) hereby extends the date by which Poly Met Mining, Inc. (the “Issuer”) shall have delivered to the Purchaser the executed consent to the Erie Plant Mortgage (the “Executed Consent”) as provided in Section 4.8(b) of the purchase agreement dated October 31, 2008 (the “Purchase Agreement”) between the Issuer, PolyMet Mining Corp. (the “Company”) and the Purchaser, to Friday, December 12, 2008 (the “New Due Date”). The New Due Date shall be inclusive of any applicable cure or notice period and failure to provide the Purchaser with the Executed Consent by the New Due Date shall be a failure by the Issuer and the Company to comply with their covenants under the Purchase Agreement which shall result in, among other things, the non-satisfaction of the conditions to the Tranche B Closing and the occurrence of an Event of Default under the Tranche A Debenture.

The Purchase Agreement shall remain in full force and effect, unamended hereby except as otherwise specifically provided herein.

Initially capitalized terms used herein that are not otherwise defined herein, shall have the respective meanings given thereto in the Purchase Agreement.

Regards,

/s/ Xxxxx Xxxxxxx

Xxxxx Xxxxxxx

GLENCORE AG

Xxxxxxxxxxxxxxxxx 0 • X.X. Xxx 000 • XX-0000 Xxxx • Switzerland

Telephone x00 00 000 00 00 • Telefax x00 00 000 00 00