Alcan Aluminium Limited



June 1, 2000



STRICTLY CONFIDENTIAL



BZ Group Holding Limited,

BZ Bank Limited and

Stillhalter Vision AG

c/o BZ Group Holding Limited

Egglirain, 24

8832 Wilen

SWITZERLAND



Attention : Mr. Kurt Schiltknecht - Director









                                TENDER AGREEMENT



Dear Sirs :



Alcan Aluminium Limited (the "Offeror") and Alusuisse Lonza Group AG ("Algroup")

are parties to a Combination Agreement dated September 15, 1999 (as previously

amended and further amended simultaneously herewith) which provides for the

making by the Offeror of a share exchange offer (the "Swiss Exchange Offer") to

acquire the issued and outstanding shares (meaning the registered shares, par

value CHF 100 per share) of Algroup (the "Algroup Shares"). This Tender

Agreement sets out the terms and conditions of the agreement by BZ Group Holding

Limited, BZ Bank Limitedand Stillhalter Vision AG, each as principals and on

behalf of their clients (the "Shareholders") to deposit or cause to be deposited

under the Swiss Exchange Offer (as defined in the Combination Agreement), in all

cases irrevocably and unconditionally, no less than 2,300,000 Algroup Shares

(collectively, the "Shareholder Securities"), the whole for the purposes of

irrevocably and unconditionally accepting this Swiss Exchange Offer in respect

of the Shareholder Securities. This Tender Agreement also sets forth the

obligations and commitments of the Shareholders in connection therewith.





                                       1

{PAGE}   2







                                    ARTICLE 1

                          REPRESENTATION AND WARRANTIES



1.1     Representations and Warranties of the Shareholders. Each of the

        Shareholders hereby represents and warrants that:



        (a)     Status and Authorization. It is a corporation duly incorporated

                or other legal entity duly formed and validly exists under the

                laws of its jurisdiction of incorporation or formation, as

                applicable; it has all necessary power, authority, capacity and

                right, and has received all requisite approvals to enter into

                this Tender Agreement and to complete the transactions

                contemplated hereby; and this Tender Agreement has been duly

                executed and delivered by it.



        (b)     Ownership and Securities. All of the Shareholder Securities are

                either owned legally and beneficially by one or more of the

                Shareholders or are subject to the unrestricted right held by

                one or more of them to tender the Shareholder Securities into

                the Swiss Exchange Offer; as among the Shareholders they have

                the exclusive right to dispose of the Shareholder Securities as

                provided in this Tender Agreement or to take all decisions and

                give all directions in this regard, in both cases to the full

                extent necessary to transfer good and marketable title to same,

                free and clear of all encumbrances and rights of third parties;

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