Rio Offer for Alcan Extended

Rio Tinto Canada has announced that the expiry date for the offer by RTCH to acquire all of the common shares of Alcan Inc. is being extended from September 24, 2007 to October 23, 2007. The extension is necessary to permit conditions to the offer to be satisfied, including obtaining various regulatory approvals. A formal notice of extension is being mailed today to all Alcan common shareholders. As of the close of business on September 14, 2007, 495,139 shares had been deposited with the depositary under the offer and not withdrawn, representing less than 0.2 per cent of Alcan's outstanding common shares on a fully-diluted basis. The offer is conditional on acceptances representing 66 2/3 per cent of Alcan shares.