Rio Tinto Offer for Alcan - additional shares acquired

26 October 2007

Rio Tinto today announces that approximately 14,040,000 additional common shares of Alcan Inc. ("Alcan") have either been validly deposited and taken up under the offer by Rio Tinto Canada Holding Inc. ("RTCH") to acquire all of the shares of Alcan (the "Offer") or are covered by notices of guaranteed delivery.  The additional shares (which represent approximately 3.73% of the outstanding shares), together with approximately 319,949,000 shares already beneficially owned by RTCH, represent approximately 88.82% of the outstanding shares of Alcan.  All additional validly deposited shares will be taken up daily and payment for such shares will be made to the depositary within two business days of take-up. Shares covered by notices of guaranteed delivery will be taken up when the certificates representing them are delivered to the depositary.  The Offer expires at 6:00 p.m. (Canadian Eastern Time) on November 8, 2007.