Document:

<PAGE>
                                                                    Exhibit 10.3

                                 FIRST AMENDMENT
                                       TO
                             PRODUCT LEASE AGREEMENT

               THIS FIRST AMENDMENT TO PRODUCT LEASE AGREEMENT (the "FIRST
AMENDMENT") is made as of the 20th day of November, 2001, between AVANT! JAPAN
CORPORATION (the "COMPANY"), with its principal place of business at Nittochi
Shin-yurigaoka Building, 5F, 1-5-2 Kamiasao Asao-ku, Kawasaki-shi, Kanagawa
215-0021, Japan and MAINGATE ELECTRONICS INC. (the "DISTRIBUTOR"), with its
principal place of business at KAKiYA Building, 3F, 2-7-17 Shinyokohama,
Kohoku-ku, Yokohama-shi, Kanagawa 222-0033, Japan.

                               W I T N E S S E T H

        WHEREAS, the Company and the Distributor are parties to that certain
Product Lease Agreement dated as of October 1, 2000 (the "AGREEMENT"); and

        WHEREAS, pursuant to the Agreement, the Distributor is entitled to
certain compensation upon the termination of the Agreement; and

        WHEREAS, the Company and the Distributor now desire to amend the
Agreement to, among other things, disallow any compensation payable to the
Distributor upon termination of the Agreement.

        NOW, THEREFORE, in consideration of the mutual covenants herein
contained and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto mutually
promise, covenant, undertake and agree as follows:

        1. Consequence of Termination. In consideration of a payment of
US$1,000.00 by the Company to the Distributor, the receipt of which is hereby
acknowledged, Section 19.4 of the Agreement shall be amended and restated in its
entirety as follows:

               "19.4 Upon termination, neither the Distributor nor any of its
affiliates shall be entitled to any compensation or fee of any sort whatsoever
from the Company or any of its affiliates."

        2. Certification by the Distributor. The Distributor certifies that:

            a.  this Agreement, as amended hereby, and the Distribution
                Agreement, dated as of October 1, 2000, between the parties (the
                "DISTRIBUTION AGREEMENT"), are the only agreements currently in
                effect between the Company or any of its affiliates on the one
                hand, and the Distributor or any of its affiliates on the other
                hand, with respect to distribution of the Company's products or
                services; and

            b.  this Agreement, as amended hereby, and the Distribution
                Agreement represent the entire agreement between the Company or
                any of its affiliates on the one hand,

<PAGE>

                and the Distributor or any of its affiliates on the other hand,
                with respect to distribution of the Company's products or
                services; and

            c.  there are no amendments, modifications, or supplements to this
                Agreement, whether oral or written, other than this First
                Amendment; and

            d.  the Company is not in any respect in default under the
                Agreement, as hereby amended; and

            e.  notwithstanding the provisions of Section 20.7 of the Agreement,
                the Distributor consents and agrees to the (A) disclosure of any
                and all terms of the Agreement and this First Amendment (i) in
                the public reports, registration statements and other filings of
                Avant! Corporation, a Delaware corporation ("PARENT"), that have
                been filed or in the future may be filed with the US Securities
                and Exchange Commission (the "SEC"), and (ii) as may be required
                by applicable law, and (B) public filing of the Agreement and
                this First Amendment with the SEC by Parent.

        3. Release. The Distributor, for itself, its legal successors and
assigns, partners, limited partners, constituent entities, affiliated and
related companies, officers, directors, stockholders, principals, servants,
employees, agents and representatives, and each of them, do hereby absolutely,
fully and forever release, relieve, waive, relinquish, absolve, acquit and
discharge the Company and the Company's respective legal successors,
predecessors, and assigns, partners, limited partners, constituent entities,
affiliated and related companies, officers, directors, stockholders, principals,
servants, employees, attorneys, agents and representatives of and from any and
all manner of claims, demands, promises, cause or causes of action, action or
actions, suits, debts, liabilities, obligations, costs, expenses, sums of money,
controversies, damages, accounts, reckonings, and liens of every kind or nature
whatsoever, whether mature, contingent, direct, derivative, subrogated,
personal, assigned, discovered, undiscovered or otherwise (hereinafter called
"CLAIMS"), which they have or may have or have had, owned, or held at any time
by reason of any matter, cause or thing whatsoever from the beginning of time to
the date hereof in any way arising out of or relating to (i) any termination
fee, termination payment or similar award due upon termination of the Agreement
arising under or in connection with the Agreement, any prior agreement between
the Company or its affiliates on the one hand, and the Distributor or its
affiliates on the other hand, or the distribution of the Company and its
affiliates' products and services by the Distributor or otherwise or (ii) this
First Amendment. Distributor hereby represents, warrants, and acknowledges to
the Company that it has received independent legal advice from its attorneys
regarding the advisability of executing this First Amendment and giving the
release provided for herein, and that it has been advised by their attorneys
concerning and is familiar with the provisions of Section 1542 of the Civil Code
of the State of California and any similar provision under Japanese law, which
provides as follows:

                A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR
                DOES NOT KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF
                EXECUTING THE RELEASE, WHICH IF KNOWN BY HIM MUST HAVE
                MATERIALLY AFFECTED HIS SETTLEMENT WITH THE DEBTOR.

                                       2

<PAGE>

Distributor, being aware of Section 1542 and such similar provisions, hereby
expressly waives and relinquishes any rights or benefits it has or may have
thereunder in connection with the release provided herein, as well as under any
other California or federal or foreign statute or common law principle of
similar effect. The Distributor acknowledges that it is aware that it or its
attorneys may hereafter discover facts different from or in addition to the
facts which it or its attorneys now know or believe to be true with respect to
the subject matter of this First Amendment, but that it is their intention
hereby to settle fully, finally, absolutely and forever any and all claims,
disputes and differences which do now exist or heretofore have existed between
the Distributor and its affiliates on the one hand, and Company and its
affiliates on the other, in any way arising out of or relating to (i) any
termination fee, termination payment or similar award due upon termination of
the Agreement arising under or in connection with the Agreement, any prior
agreement between the Company or its affiliates on the one hand, and the
Distributor or its affiliates on the other hand, or the distribution of the
Company and its affiliates' products and services by the Distributor or
otherwise or (ii) this First Amendment. In furtherance of this intention, the
release herein given shall be and remain in effect as a full and complete
release notwithstanding discovery of any such different or additional facts.

        4. Miscellaneous.

               4.1 Amendment and Waiver. Except as otherwise expressly provided
herein, any provision of this First Amendment may be amended and the observance
of any provision of this First Amendment may be waived (either generally or any
particular instance and either retroactively or prospectively) only with the
written consent of the parties.

               4.2 Governing Law and Legal Actions. This First Amendment shall
be governed by and construed under the laws of Japan without regard to conflicts
of laws or provisions thereof and without regard to the United Nations
Convention on Contracts for the International Sale of Goods. Both parties
consent to the non-exclusive jurisdiction of the Japanese courts and agree that
process may be served in the manner provided for giving of notices or otherwise
as allowed by Japanese law. In any action or proceeding to enforce rights under
this Agreement, the prevailing party shall be entitled to recover costs and
attorneys' fees.

               4.3 Severability. If any provision of this First Amendment is
held by a court of competent jurisdiction to be illegal, invalid, or
unenforceable, that provision shall be limited or eliminated to the minimum
extent necessary so that this First Amendment shall otherwise remain in full
force and effect and enforceable.

               4.4 Entire Agreement. This First Amendment supersedes all
proposals, oral or written, all negotiations, conversations, discussions, or
prior agreements between or among parties relating to the subject matter of this
First Amendment and all past dealing or industry custom.

               4.5 Assignment. The Distributor may not assign this First
Amendment or the rights thereunder without the prior consent of the Company. The
Company may assign this First Amendment by giving notice to the Distributor.

                                       3

<PAGE>

               4.6 Counterparts. This First Amendment may be executed in
counterparts, each of which shall be deemed an original, but both of which
together shall constitute one and the same instrument.

                            [SIGNATURE PAGE FOLLOWS]

                                       4

<PAGE>

               IN WITNESS WHEREOF, the parties hereto have executed this First
Amendment, all of the day and year first above written.

                                         AVANT! JAPAN CORPORATION

                                         By  /s/ Howard Ko
                                           ------------------------------------
                                         Name: Howard Ko

                                         Title: Executive Operating Officer

                                         MAINGATE ELECTRONICS INC.

                                         By  /s/ Moriyuki Chimura
                                           ------------------------------------
                                         Name: Moriyuki Chimura

                                         Title: President

         (SIGNATURE PAGE TO FIRST AMENDMENT TO PRODUCT LEASE AGREEMENT)
                                       S-1EXHIBIT 4.1

===============================================================================

                              ECHO BAY MINES LTD.

                                 $100,000,000
                      11% Junior Subordinated Debentures
                                   due 2027

                         THIRD SUPPLEMENTAL INDENTURE

                         Dated as of December 4, 2001

                            BANKERS TRUST COMPANY,
                            a New York corporation,
                                  as Trustee

===============================================================================

<PAGE>

                    THIRD SUPPLEMENTAL INDENTURE dated as of December 4, 2001,
               between ECHO BAY MINES LTD., a corporation duly incorporated
               and existing under the laws of Canada, having its registered
               office at 1210 ManuLife Place, 10180-101 Street, Edmonton,
               Alberta T5J 3S4 (the "Company"), and Bankers Trust Company, a
               New York corporation, as trustee (the "Trustee") under the
               Indenture dated as of March 27, 1997, between the Company and
               the Trustee (the "Original Indenture").

          WHEREAS the Company and the Trustee have previously executed and
delivered a First Supplemental Indenture dated as of March 27, 1997 (the
"First Supplemental Indenture"), pursuant to which the Company has issued its
11% Junior Subordinated Debentures due 2027 (the "Capital Securities");

          WHEREAS the Company and the Trustee have previously executed and
delivered a Second Supplemental Indenture dated as of September 15, 1998 (the
"Second Supplemental Indenture" and, together with the Original Indenture and
the First Supplemental Indenture, the "Indentures") in order to add a covenant
to pay additional interest in certain circumstances for the benefit of
Holders;

          WHEREAS the Company has entered into letter agreements with certain
Holders of Capital Securities (each a "Letter Agreement"), pursuant to which
(i) each such Holder has agreed to exchange (the "Exchange") any and all
Capital Securities held by it for Common Shares and (ii) the Company has
agreed to issue Common Shares to such Holders to effect the Exchange, in each
case on the terms and subject to the conditions contained in the Letter
Agreements;

          WHEREAS the Company desires to supplement the Indenture with respect
to the Capital Securities pursuant to Section 9.2 of the Original Indenture
and Section 8.01 of the First Supplemental Indenture in order to (i) provide
the Holders of Capital Securities with conversion rights on such terms as may
be specified in an Authorizing Resolution (as defined below) and (ii) make
certain other changes to the provisions of the Original Indenture and the
First Supplemental Indenture, in each case as more fully described herein;

          WHEREAS the Holders of more than a majority in aggregate principal
amount of outstanding Capital Securities

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                                                                             2

have consented to (i) the execution by the Company and the Trustee of this
Third Supplemental Indenture and (ii) the waiver of any past default or Event
of Default that may have occurred under the terms of the Original Indenture or
the First Supplemental Indenture as a result of the execution and delivery by
the Company of the Letter Agreements, such consents having been delivered by
such Holders pursuant to the terms of Section 9.2 and Section 5.13 of the
Original Indenture, respectively; and

          WHEREAS all capitalized terms used herein, but not defined herein,
are used as defined in the Original Indenture, the First Supplemental
Indenture or the Second Supplemental Indenture, as the case may be.

          NOW THEREFORE the Company covenants and agrees with the Trustee as
follows:

          SECTION 1. Article IX of the First Supplemental Indenture shall be
replaced, in its entirety, with the following:

                                  ARTICLE IX

                           Conversion of Securities
                           ------------------------

               SECTION 9.01. Applicability; Conversion Privilege and
     Conversion Rate. (a) At any time, the Board of Directors of the Company
     may, pursuant to a Board Resolution (an "Authorizing Resolution"), set
     out the terms pursuant to which the Holders of Capital Securities may
     convert such Capital Securities into Common Shares in accordance with the
     provisions of this Article IX.

               (b) Subject to and upon compliance with the provisions of this
     Article and following the date of an Authorizing Resolution, at the
     option of the Holder thereof, any Capital Securities or any portion of
     the principal amount thereof which is U.S. $1,000 or an integral multiple
     of U.S. $1,000, may be converted at the principal amount thereof, or of
     such portion thereof, into fully paid and non-assessable Common Shares of
     the Company, at the Conversion Rate, determined as hereinafter provided,
     in effect at the time of conversion. Such conversion right shall expire
     on such date as shall be specified in the applicable Authorizing
     Resolution. In case the Capital Securities or portion thereof are called
     for

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                                                                             3

     redemption, such conversion right in respect of the Capital Securities or
     portion so called shall expire at the close of business on the Redemption
     Date, unless the Company defaults in making the payment due upon
     redemption.

               (c) The number of Common Shares to be delivered upon conversion
     per $1,000 principal amount of Capital Securities (the "Conversion Rate")
     shall initially be that number of Common Shares as set forth in the
     applicable Authorizing Resolution. The Conversion Rate shall be adjusted
     in certain instances as provided in Section 9.04.

               SECTION 9.02. Exercise of Conversion Privilege. (a) In order to
     exercise the conversion privilege, the Holder of any Capital Securities
     to be converted shall surrender such Capital Securities, duly endorsed or
     assigned to the Company or in blank, at any office or agency of the
     Company maintained for that purpose pursuant to Section 10.2 of the
     Indenture, accompanied by written notice to the Company (which shall be
     substantially in the form set forth in Section 2.3 of the Indenture) at
     such office or agency or, if applicable, by notice in accordance with the
     procedures of the Depositary that the Holder elects to convert such
     Capital Securities or, if less than the entire principal amount thereof
     is to be converted, the portion thereof to be converted. During any
     period other than an Extension Period, Capital Securities surrendered for
     conversion during the period from the close of business on any record
     date next preceding any Interest Payment Date to the opening of business
     on such Interest Payment Date shall (except in the case of Capital
     Securities or portions thereof which have been called for redemption on a
     Redemption Date within such period) be accompanied by payment in New York
     Clearing House funds or other funds acceptable to the Company of an
     amount equal to the interest payable on such Interest Payment Date on the
     principal amount of Capital Securities being surrendered for conversion;
     provided, however, that Capital Securities surrendered for conversion on
     an Interest Payment Date need not be accompanied by a payment and
     interest on the principal amount of the Capital Securities being
     converted will be paid on such Interest Payment

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                                                                             4

     Date to the Holder of such Capital Securities on the immediately
     preceding record date. Except as provided in this Section 9.02(a) or as
     set forth in the applicable Authorizing Resolution, no payment or
     adjustment shall be made upon any conversion on account of any interest
     accrued on the Capital Securities surrendered for conversion, including
     any Deferred Interest, or on account of any dividends on the Common
     Shares issued upon conversion.

               (b) Capital Securities shall be deemed to have been converted
     immediately prior to the close of business on the day of surrender of
     such Capital Securities for conversion in accordance with the foregoing
     provisions, and at such time the rights of the Holders of such Capital
     Securities as Holders shall cease, and the Person or Persons entitled to
     receive the Common Shares issuable upon conversion shall be treated for
     all purposes as the record holder or holders of such Common Shares at
     such time. As promptly as practicable on or after the date of conversion,
     the Company shall issue and shall deliver at such office or agency a
     certificate or certificates for the number of full Common Shares issuable
     upon conversion, together with payment in lieu of any fraction of a
     share, as provided in Section 9.03.

               (c) All Capital Securities converted in accordance with the
     provisions of this Article IX are, and shall be deemed to have been,
     transferred to or for the account of the Company.

               (d) In the case of any Capital Securities which are converted
     in part only, upon such conversion, the Company shall execute and the
     Trustee shall authenticate and deliver to the Holder thereof, at the
     expense of the Company, a new Capital Security or Capital Securities of
     authorized denominations in aggregate principal amount equal to the
     unconverted portion of the principal amount of such Capital Security or
     Capital Securities.

               SECTION 9.03. Fractions of Shares. No fractional Common Shares
     or other such securities shall be issued upon conversion of Capital
     Securities. If more than one Capital Security shall be surrendered for
     conversion at one time by

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                                                                             5

     the same Holder, the number of full shares which shall be issuable upon
     conversion thereof shall be computed on the basis of the aggregate
     principal amount of the Capital Securities (or specified portions
     thereof) so surrendered. Instead of any fractional Common Share which
     would otherwise be issuable upon conversion of any Capital Securities (or
     specified portions thereof), any such fractional share shall be rounded
     up to a full Common Share, unless otherwise provided in the applicable
     Authorizing Resolution.

               SECTION 9.04. Adjustment of Conversion Rate. The Conversion
     Rate with respect to any Capital Security which is convertible into
     Common Shares shall be subject to adjustment from time on such terms, if
     any, as shall be specified in the applicable Authorizing Resolution.

               SECTION 9.05. Company to Reserve Common Shares. The Company
     shall at all times reserve and keep available, free from pre-emptive
     rights, out of its authorized but unissued Common Shares, for the purpose
     of effecting the conversion of Capital Securities, such number of its
     duly authorized Common Shares then issuable upon the conversion of all
     outstanding Capital Securities; provided that this Section 9.05 shall not
     require the Company to make any reservation of authorized but unissued
     Common Shares for so long as the Company's authorized share capital
     includes an unlimited number of Common Shares.

               SECTION 9.06. Taxes on Conversion. The Company will pay any and
     all taxes that may be payable in respect of the issue or delivery of
     Common Shares on conversion of Capital Securities pursuant hereto;
     provided, however, that the Company shall not be obligated to pay any tax
     on or measured by income that may be payable by any Holder. The Company
     shall not, however, be required to pay any tax which may be payable in
     respect of any transfer involved in the issue and delivery of Common
     Shares in a name other than that of the Holder of the Capital Security or
     Capital Securities to be converted, and no such issue or delivery shall
     be made unless and until the Person requesting such issue has paid to the
     Company the amount of any such tax, or has

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                                                                             6

     established to the satisfaction of the Company that such tax has been
     paid.

               SECTION 9.07. Covenant as to Common Shares. The Company
     covenants that all Common Shares which may be issued upon conversion of
     Capital Securities will upon issue be fully paid and non-assessable and,
     except as provided in Section 9.06, the Company will pay all taxes, liens
     and charges with respect to the issue thereof.

               SECTION 9.08. Company as Holder of Converted Securities. All
     Capital Securities surrendered for conversion pursuant to Section 9.02
     shall be delivered to the Company. The Company (or any Subsidiary holding
     such Capital Securities or any other Person holding such Capital
     Securities for any of their respective accounts) shall be deemed to be
     the Holder of such Capital Securities commencing on the close of business
     on the day such Capital Securities are surrendered for conversion;
     provided, however, that while any of such Capital Securities are
     outstanding and held by or for the account of any person other than the
     Company (or any Subsidiary or any other Person holding such Capital
     Securities for any of their respective accounts), the Company (or any
     Subsidiary holding such Capital Securities or any other Person holding
     such Capital Securities for any of their respective accounts) shall not
     be entitled to any of the rights and remedies of a Holder hereunder,
     including the right to convert such Capital Securities into Common
     Shares, other than the unconditional right of a Holder to receive
     principal, premium and interest on such Capital Securities and the right
     to enforce payment thereof as provided in Article II of the Indenture.

               SECTION 9.09. Provisions in Case of Consolidation, Merger or
     Sale of Assets. In case of any consolidation of the Company with, or
     merger of the Company into, any other corporation, any merger of another
     corporation into the Company (other than a merger which does not result
     in any reclassification, conversion, exchange or cancellation of
     outstanding Common Shares of the Company) or any sale or transfer of all
     or

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                                                                             7

     substantially all of the assets of the Company (treating the Company and
     each of its Subsidiaries as a single consolidated entity and treating any
     sale by a Subsidiary as a sale by the Company for such purpose), the
     corporation formed by such consolidation or resulting from such merger or
     which acquires such assets, as the case may be, shall execute and deliver
     to the Trustee a supplemental indenture providing that each Holder of
     Capital Securities then outstanding shall have the right thereafter,
     during the period such Capital Securities shall be convertible as
     specified in Section 9.01, to convert such Capital Securities only into
     the kind and amount of securities, cash and other property receivable
     upon such consolidation, merger, sale or transfer by a holder of the
     number of Common Shares of the Company into which such Capital Securities
     might have been converted immediately prior to such consolidation,
     merger, sale or transfer, assuming such holder of Common Shares (i) is
     not a Person with which the Company consolidated or into which the
     Company merged or which merged into the Company or to which such sale or
     transfer was made, as the case may be ("constituent Person"), or an
     Affiliate of a constituent Person and (ii) failed to exercise his rights
     of election, if any, as to the kind or amount of securities, cash and
     other property receivable upon such consolidation, merger, sale or
     transfer (provided that if the kind or amount of securities, cash and
     other property receivable upon such consolidation, merger, sale or
     transfer is not the same for each Common Share of the Company held
     immediately prior to such consolidation, merger, sale or transfer by
     others than a constituent Person or an Affiliate thereof and in respect
     of which such rights of election shall not have been exercised ("non-
     electing share"), then for the purpose of this Section 9.09 the kind and
     amount of securities, cash and other property receivable upon such
     consolidation, merger, sale or transfer by each non-electing share shall
     be deemed to be the kind and amount so receivable per share by a
     plurality of the non-electing shares). Such supplemental indenture shall
     provide for adjustments which, for events subsequent to the effective
     date of such supplemental indenture, shall be as nearly equivalent as may
     be practicable to the adjustments provided for in this Article. The

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                                                                             8

     Trustee shall not be under any responsibility to determine the
     correctness of any provision contained in such supplemental indenture
     relating to either the kind or amount of shares, other securities, cash
     or property receivable by Holders upon the conversion of their Capital
     Securities after any such consolidation, merger, sale or transfer. The
     above provisions of this Section 9.09 shall similarly apply to successive
     consolidations, mergers, sales or transfers.

               SECTION 9.10. Responsibility of Trustee and Conversion Agent.
     Neither the Trustee nor any agent appointed to effect conversions shall
     at any time be under any duty or responsibility to any Holder of Capital
     Securities to determine whether any facts exist which may require any
     adjustment of the Conversion Rate, or with respect to the nature or
     extent of any such adjustment when made, or with respect to the method
     employed, or herein or in any supplemental indenture provided to be
     employed, in making the same. Neither the Trustee nor any such conversion
     agent shall be accountable with respect to the validity or value (or the
     kind or amount) of any Common Shares or of any securities or property
     which may at any time be issued or delivered upon the conversion of any
     Capital Securities; and neither the Trustee nor any such conversion agent
     makes any representation with respect thereto. Neither the Trustee nor
     any such conversion agent shall be responsible for any failure of the
     Company to issue, transfer or deliver any Common Shares or stock
     certificates or other securities or property or to make any cash payment
     upon the delivery of any Capital Security for the purpose of conversion
     or to comply with any of the covenants contained in this Article IX.

<PAGE>

                                                                             9

          SECTION 2. Section 4.01(c) of the First Supplemental Indenture shall
be replaced, in its entirety, with the following:

          "(c) the occurrence of a Change of Control (other than any Change of
     Control occurring as a result of the performance by the Company of its
     obligations pursuant to the terms of the letter agreement dated September
     5, 2001, between Franco- Nevada Mining Corporation Limited and the
     Company), unless cured pursuant to Section 5.16;"

          SECTION 3. Ratification of Indenture. The Indenture, as supplemented
by this Third Supplemental Indenture, is in all respects ratified and
confirmed, and this Third Supplemental Indenture shall be deemed part of the
Indenture in the manner and to the extent herein and therein provided. To the
extent any provision of this Third Supplemental Indenture differs from that of
the Indenture, the provision contained in this Third Supplemental Indenture
shall supersede the provision contained in the Indenture.

          SECTION 4. Trustee Not Responsible for Recitals. The recitals herein
contained are made by the Company and not by the Trustee, and the Trustee
assumes no responsibility for the correctness thereof. The Trustee makes no
representation as to the validity or sufficiency of this Third Supplemental
Indenture.

          SECTION 5. Governing Law. This Third Supplemental Indenture and each
Capital Security shall be deemed to be a contract made under the internal laws
of the State of New York, and for all purposes shall be construed in
accordance with the laws of said State.

          SECTION 6. Counterparts. This Third Supplemental Indenture may be
executed in any number of counterparts each of which shall be an original, but
such counterparts shall together constitute but one and the same instrument.

          SECTION 7. Successors. All agreements of the Company in this Third
Supplemental Indenture and the Capital Securities shall bind its successor.
All agreements of the Trustee in this Third Supplemental Indenture shall bind
its successor.

<PAGE>

                                                                            10

          IN WITNESS WHEREOF, the parties hereto have caused this Third
Supplemental Indenture to be duly executed as of the day and year first above
written.

                                        ECHO BAY MINES LTD.,

                                          by /s/ Tom S. Q. Yip
                                             -----------------------------
                                             Name:  Tom S. Q. Yip
                                             Title: Vice President

                                        BANKERS TRUST COMPANY,
                                        as Trustee,

                                          by /s/ Susan Johnson
                                             -----------------------------
                                             Name:  Susan Johnson
                                             Title: Vice President

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