Suite 3400

Exhibit 99.1

		▇▇▇▇▇ ▇▇▇▇
		▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇
		▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇
		▇▇▇▇▇▇, ▇▇▇ ▇▇▇
		Telephone
		(▇▇▇) ▇▇▇-▇▇▇▇
		Facsimile
		(▇▇▇) ▇▇▇-▇▇▇▇
		▇▇▇.▇▇▇▇▇▇▇▇.▇▇▇

September 12, 2006

▇▇▇▇▇▇▇ ▇. Jeannes
Executive Vice President, Administration
Glamis Gold Ltd.
▇▇▇▇ ▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇ ▇▇▇
▇▇▇▇, ▇▇▇▇▇▇
▇▇▇▇▇

Re: Goldcorp Inc. — Project Sahara

This letter agreement is to evidence that the undersigned have hereby agreed that the Arrangement Agreement among Goldcorp Inc., 0756808 B.C. Ltd. and Glamis Gold Ltd. dated August 30, 2006 (the “Arrangement Agreement”) in sections 4.02 (l) and Section 7.03 (h) to “September 13, 2006” is amended as and from September 12, 2006 by replacing the reference to “September 13, 2006” to “September 26, 2006”.

All other terms and conditions of the Arrangement Agreement remain in full force and effect, unamended.

Please sign this letter agreement where indicated and return an original to our attention to confirm your agreement with the amendments to the Arrangement Agreement set out herein.

Yours truly,

Goldcorp Inc. and 0756808 B.C. Ltd.
Per:
(Signed) ▇▇▇▇▇▇▇ ▇▇▇▇

▇▇▇▇▇▇▇ ▇▇▇▇
Authorized Signing Representative

Acknowledged and agreed this 13^th day of September, 2006.

Glamis Gold Ltd.
Per:
(Signed) ▇▇▇▇▇ ▇▇▇▇▇▇▇▇		(Signed) ▇▇▇▇▇▇▇ ▇. Jeannes
▇▇▇▇▇ ▇▇▇▇▇▇▇▇		▇▇▇▇▇▇▇ ▇. Jeannes
President and Chief Executive Officer		Executive Vice President, Administration