Document:

EXHIBIT 4.18

                                                         Return after filing to:
                                             Wachovia Bank, National Association
                                                                         PA 1246
                                                          123 South Broad Street
                                                          Philadelphia, PA 19109
                                                 Attn: Kathleen M. Hedrich, V.P.

                FOURTH AMENDMENT TO MORTGAGE, SECURITY AGREEMENT
                ------------------------------------------------
                         AND FIXTURE FINANCING STATEMENT
                         -------------------------------

         THIS FOURTH AMENDMENT TO MORTGAGE, SECURITY AGREEMENT AND FIXTURE
FINANCING STATEMENT (the "Amendment"), made as of March 18, 2004, is by and
between WACHOVIA BANK, NATIONAL ASSOCIATION, formerly known as First Union
National Bank, a national banking association, with offices located at Broad and
Walnut Streets, Philadelphia, Pennsylvania 19109 (the "Mortgagee") and
RESISTANCE TECHNOLOGY, INC., a Minnesota corporation having its principal place
of business at 1260 Red Fox Road, Arden Hills, Minnesota 55112 (the
"Mortgagor").

                                   BACKGROUND
                                   ----------

         A. The Mortgagor, the Mortgagee, Selas Corporation of America (the
"Borrower"), Deuer Manufacturing, Inc. ("Deuer"), RTI Export, Inc. ("RTIE"), and
RTI Electronics, Inc. ("RTI Electronics" and, together with the Mortgagor,
collectively, the "Guarantors") entered into that certain Amended and Restated
Credit Agreement dated as of July 31, 1998, as amended by an Amendment dated as
of June 30, 1999, a Second Amendment dated as of July 7, 2000 and a Third
Amendment dated as of January 19, 2001 (as amended, the "Existing Credit
Agreement"), pursuant to which the Mortgagee made available to the Borrower (i)
certain term loans (collectively, the "Existing Term Loans"), and (ii) a
revolving credit facility (the "Existing Revolving Credit Facility").

         B. The Existing Term Loans are evidenced by, INTER ALIA, the following
promissory notes executed by the Borrower in favor of the Mortgagee: (i) Term
Note D dated as of June 30, 1999 ("Term Note D"), (ii) Term Note E dated as of
January 19, 2001 ("Term Note E"), and (iii) Term Note F dated as of January 19,
2001 ("Term Note F" and, together with Term Note D and Term Note E,
collectively, the "Existing Term Notes"). The Existing Revolving Credit Facility
is evidenced by, INTER ALIA, an Amended and Restated Revolving Credit Note dated
as of January 19, 2001 executed by the Borrower in favor of the Mortgagee (the
"Existing Revolving Credit Note").

         C. The Mortgagee, through the Mortgagee's London Branch ("London
Branch"), and Selas SAS (formerly known as Selas S.A.), a corporation organized
under the laws of France and a subsidiary of the Borrower ("Selas SAS"), entered
into that certain Facility Agreement dated as of February 2, 2001, amended and
restated in its entirety pursuant to that certain Amended and Restated Facility
Agreement dated as of April 15, 2002, and amended by that certain First
Amendment to Amended and Restated Facility Agreement dated as of

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January 16, 2003, that certain Second Amendment to Amended and Restated Facility
Agreement dated as of February 27, 2003, and that certain Third Amendment to
Amended and Restated Facility Agreement dated as of March 14, 2003 (as amended,
the "Existing Selas SAS Facility Agreement"), pursuant to which the Mortgagee
provided to Selas SAS a discretionary overdraft facility (the "Existing
Overdraft Facility"), as evidenced by certain documents executed in connection
with the Existing Overdraft Facility.

         D. The Mortgagee, through its London Branch, and Selas SAS also entered
into that certain term loan agreement dated January 2000, amended and restated
in its entirety by that certain agreement dated as of April 15, 2002, and
amended by that certain First Amendment to Selas SAS 2000 Term Loan Agreement
dated as of January 16, 2003, that certain Second Amendment to Selas SAS 2000
Term Loan Agreement dated as of February 27, 2003, and that certain Third
Amendment to Selas SAS 2000 Term Loan Agreement dated as of March 14, 2003 (as
amended, the "Existing Selas SAS 2000 Term Loan Agreement") pursuant to which
the Mortgagee made a term loan to Selas SAS (the "Existing Selas SAS 2000 Term
Loan"), as evidenced by certain documents executed in connection with the
Existing Selas SAS 2000 Term Loan.

         E. The Borrower, the Guarantors, Deuer, RTIE, Selas SAS, CFR-CECF
Fofumi Ripoche, a corporation organized under the laws of France and a
subsidiary of the Borrower ("CFR") and the Mortgagee entered into that certain
Second Waiver and Amendment Agreement dated as of April 15, 2002, as amended by
that certain First Amendment to Second Waiver and Amendment Agreement dated as
of June 24, 2002, that certain Second Amendment to Second Waiver and Amendment
Agreement dated as of July 30, 2002, that certain Third Amendment to Second
Waiver and Amendment Agreement dated as of November 14, 2002, that certain
Fourth Amendment to Second Waiver and Amendment Agreement dated as of January
16, 2003, that certain Fifth Amendment to Second Waiver and Amendment Agreement
dated as of February 21, 2003, that certain Sixth Amendment to Second Waiver and
Amendment Agreement dated as of February 27, 2003, and that certain Seventh
Amendment to Second Waiver and Amendment Agreement dated as of March 7, 2003 (as
amended, the "Second Waiver Agreement"), pursuant to which the Mortgagee agreed,
among other things, to provide the Borrower with a supplemental credit facility
(the "Existing Supplemental Credit Facility") as evidenced by that certain
Supplemental Credit Facility Note dated as of April 15, 2002 (the "Existing
Supplemental Credit Facility Note" and, with the Existing Term Notes, the
Existing Revolving Credit Note and certain documents executed in connection with
the Existing Overdraft Facility and the Existing Selas SAS 2000 Term Loan,
collectively, the "Existing Notes").

         F. The Mortgagor guaranteed and became surety for all loans, advances,
debts, liabilities, obligations, covenants and duties of the Borrower to the
Mortgagee, pursuant to that certain Guaranty and Suretyship Agreement of RTI
dated as of October 20, 1993 and amended as of July 31, 1998 (as amended, the
"RTI Surety Agreement").

         G. The Mortgagor guaranteed and became surety for all loans, advances,
debts, liabilities, obligations, covenants and duties of Selas SAS to the
Mortgagee, pursuant to that certain Unconditional Guaranty of the Mortgagor
dated as of January 10, 2000 (the "RTI Guaranty").

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<PAGE>

         H. As security for any and all indebtedness, liabilities and
obligations of the Mortgagor to the Mortgagee, the Mortgagor, pursuant to that
certain Mortgage, Security Agreement and Fixture Financing Statement dated as of
June 30, 1999, and recorded on August 17, 1999 in the Office of the Recorder of
Ramsey County, Minnesota (the "Recorder's Office") as Document No. 3263329, as
amended by that certain First Amendment to Mortgage, Security Agreement and
Fixture Financing Statement dated as of January 10, 2000 and recorded in the
Recorder's Office on March 21, 2000 as Document No. 3312490, as further amended
by that certain Second Amendment to Mortgage, Security Agreement and Fixture
Financing Statement dated as of November 20, 2001 and recorded in the Recorder's
Office on December 24, 2001 as Document No. 3454614, as further amended by that
certain Third Amendment to Mortgage, Security Agreement and Fixture Financing
Statement dated as of April 15, 2002 and recorded in the Recorder's Office on
May 9, 2002 as Document No. 3498400 (as amended, the "Mortgage"), granted to the
Mortgagee a first mortgage lien on certain real property of the Mortgagor and
improvements thereon located in Ramsey County, Minnesota (the "Minnesota
Property") as more fully described on the attached Exhibit "A." The Existing
Credit Agreement, the Existing Notes, the RTI Surety Agreement, the RTI
Guaranty, the Mortgage and all documents, instruments and agreements executed in
connection therewith are referred to hereinafter collectively as the "Existing
Credit Documents."

         I. The Borrower, the Mortgagor and RTIE have requested that the
Mortgagee amend, restate and consolidate the terms and conditions of the
Existing Credit Documents, and the Mortgagee has agreed to do so upon and
subject to the terms and conditions of that certain Amended, Restated and
Consolidated Loan Agreement, dated as of the date hereof, by and among the
Borrower, the Mortgagor, RTIE and the Mortgagee (the "Agreement").

         J. Pursuant to the Agreement the Mortgagee has agreed to make available
to the Borrower (i) a revolving credit facility (the "Revolving Credit
Facility"), evidenced by that certain Amended and Restated Revolving Credit
Facility Note in the original principal amount of Four Million Five Hundred
Thousand Dollars ($4,500,000), dated as of even date herewith (the "Revolving
Credit Facility Note"), and (ii) a term loan (the "Term Loan"), evidenced by
that certain Amended, Restated and Consolidated Term Loan Note in the original
principal amount of Five Million Five Hundred Eight Thousand Four Hundred Sixty
Nine and 92/100 Dollars ($5,508,469.92), dated as of even date herewith (the
"Term Note").

         K. As a condition precedent to the execution of and performance under
the Agreement by the Mortgagee, the Mortgagee has required that the Mortgagor
and the other Guarantors execute and deliver that certain Amended, Restated and
Consolidated Guaranty (the "Guaranty"), dated as of even date herewith, pursuant
to which the Mortgagor and the other Guarantors jointly and severally guaranteed
and became surety for all loans, advances, debts, liabilities, obligations,
covenants and duties of the Borrower to the Mortgagee. The Agreement, the Term
Note, the Revolving Credit Facility Note, the Guaranty and all documents,
agreements and instruments executed in connection therewith are referred to
herein collectively as the "Restructuring Documents."

         L. In order to further secure the obligations of the Mortgagor to the
Mortgagee under the Agreement, the Guaranty and the other Loan Documents, the
Mortgagor has requested that the Mortgagor execute this Amendment, amending
certain terms contained in the Mortgage and

                                       3
<PAGE>

the Mortgagor acknowledges that the Mortgagee would not have entered into the
Agreement without the execution and delivery by the Mortgagor of this Amendment.

         NOW THEREFORE, incorporating the foregoing Background herein by
reference and for other good and valuable consideration, the receipt and legal
sufficiency of which are hereby acknowledged, and intending to be legally bound
hereby, the parties agree as follows:

         1. Capitalized Terms. Capitalized terms not otherwise defined herein
shall have the meanings ascribed to such terms in the Mortgage.

         2. Amendments to Mortgage.

            (a) The defined term "Note" as used in the Mortgage is hereby
amended to mean the Term Note and the Revolving Credit Facility Note and to
include the obligations of the Mortgagor in respect of the Term Note and the
Revolving Credit Facility Note in the obligations secured by the Mortgage. Any
reference to the singular term "Note" in the Mortgage shall be deemed to be a
reference to the plural term "Notes."

            (b) The defined term "Credit Documents" as used in the Mortgage is
hereby amended to mean the Restructuring Documents and any and all other
documents, instruments and agreements evidencing or relating to the Liabilities
and all amendments, modifications or restatements of the same.

            (c) The defined term "Liabilities" as used in the Mortgage is hereby
amended to mean any and all loans, advances, debts, liabilities, obligations,
covenants and duties of the Mortgagor to the Mortgagee, now existing or
hereafter arising, including without limitation, all obligations or liabilities
under the Existing Credit Documents, as amended, restated and consolidated by
the Restructuring Documents.

            (d) All references in the Mortgage to the "Mortgage" are hereby
amended to mean the Mortgage as amended by this Amendment.

            (e) Section 6.01 of the Mortgage is hereby amended in its entirety
to read as follows:

         "Section 6.01. Events of Default. An Event of Default under any Credit
         Document shall be an Event of Default hereunder."

         3. Representations and Warranties. Mortgagor hereby represents and
warrants to Mortgagee that as of the date hereof:

            (a) Mortgagor has the power to execute, perform and deliver this
Amendment and each of the documents, instruments and agreements to be executed
and/or delivered in connection herewith and has taken all necessary action to
authorize the execution, delivery and performance of this Amendment and each of
the documents, instruments and agreements executed and/or delivered in
connection herewith;

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<PAGE>

            (b) The Mortgage, as amended by this Amendment, is a binding and
legally enforceable obligation of Mortgagor enforceable in accordance with its
terms; and

            (c) Mortgagor has no defenses, setoffs, and/or counterclaims to its
obligations under the Mortgage, as amended by this Amendment, and the documents,
instruments, and agreements executed in connection therewith and herewith.

         4. No Novation. Except as expressly modified and amended by this
Amendment, the Mortgage shall remain in full force and effect in accordance with
its terms. This Amendment does not represent in any way satisfaction of the
indebtedness evidenced by the Note. It is the intention of the parties hereto
that this Amendment shall not constitute a novation of the Note or any of the
other Existing Credit Documents, or the indebtedness and obligations evidenced
or secured thereby, and shall in no way adversely affect or impair the lien
priority of the Mortgage. Mortgagor hereby ratifies, reaffirms, and confirms the
Mortgage and the obligations secured thereby.

         5. Confirmation of Collateral. Mortgagor hereby represents, warrants
and reaffirms to Mortgagee that: (a) it is the intention of the parties to this
Amendment that all existing collateral security held by Mortgagee shall continue
to serve as collateral for the Mortgagor's obligations under the Credit
Documents, and (b) the Mortgage shall continue in full force and legal effect
until Mortgagor's obligations to Mortgagee are paid in full.

         6. Severability. Any provision in this Amendment that is held to be
inoperative, unenforceable, voidable or invalid in any jurisdiction shall, as to
that jurisdiction, be ineffective, unenforceable, void or invalid without
affecting such provisions in any other jurisdiction, or affecting the remaining
provisions in that or any other jurisdiction and to this end the provisions of
this Amendment are declared to be severable.

         7. Governing Law. This Amendment shall be construed in accordance with
and governed by the internal laws of the State of Minnesota.

         8. Successors and Assigns. All provisions of this Amendment shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and assigns.

         9. Integration. This Amendment and the other Credit Documents
constitute the sole agreement of the parties with respect to the subject matter
hereof and thereof and supersede all oral negotiations and prior writings with
respect to the subject matter hereof and thereof.

         10. Receipt of Copy. Mortgagor hereby acknowledges receipt of a true,
correct and complete copy of this Amendment as of the day and year first above
written.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by its duly authorized officer, under seal, on the day and year first
above written.

WITNESS:                                RESISTANCE TECHNOLOGY, INC.

By:                                     By:
    --------------------------------        ------------------------------------
    Name:                                   Name:  Robert F. Gallagher
    Title:                                  Title: Chief Financial Officer

                                        WACHOVIA BANK,
                                        NATIONAL ASSOCIATION

                                        By:
                                            ------------------------------------
                                            Name:  Kathleen M. Hedrich
                                            Title: Vice President

<PAGE>

STATE OF                     :
                             :      ss.
COUNTY OF                    :

         On this ____ day of March 2004, before me, a Notary Public, Robert F.
Gallagher, the undersigned officer, personally appeared, who acknowledged
himself/herself to be Chief Financial Officer of RESISTANCE TECHNOLOGY, INC., a
Minnesota business corporation and that he/she as such officer, being authorized
to do so, executed the foregoing agreement for the purpose therein contained by
signing the name of the corporation by himself/herself as such officer.

         WITNESS my hand and Notorial seal, the day and year aforesaid.

                                                    ----------------------------
                                                    Notary Public

COMMONWEALTH OF PENNSYLVANIA :
                             :      ss.
COUNTY OF                    :

         On this ____ day of March 2004, before me, a Notary Public, Kathleen M.
Hedrich, the undersigned officer, personally appeared, who acknowledged
himself/herself to be Vice President of WACHOVIA BANK, NATIONAL ASSOCIATION,
formerly known as First Union National Bank, a national banking association, and
that he/she as such officer, being authorized to do so, executed the foregoing
agreement for the purpose therein contained by signing the name of the
association by himself/herself as such officer.

         WITNESS my hand and Notorial seal, the day and year aforesaid.

                                                    ----------------------------
                                                    Notary Public

<PAGE>

                                    EXHIBIT A

                                LEGAL DESCRIPTIONExhibit 4.1
                                                                     -----------

          POTASH CORPORATION OF SASKATCHEWAN INC. STOCK OPTION PLAN --
                             OFFICERS AND EMPLOYEES

1.       Purpose of Plan

         Potash Corporation of Saskatchewan Inc. (the "Corporation") by
         resolution of its Board of Directors (the "Board") has established this
         Plan to encourage officers and employees of the Corporation and its
         subsidiaries to promote the growth and profitability of the Corporation
         by providing them with the opportunity through options to acquire
         Common Shares of the Corporation ("Common Shares").

2.       Administration

         This Plan shall be administered by the Board.

3.       Grant of Options

         From time to time the Board may designate individual officers and
         employees of the Corporation and its subsidiaries eligible to be
         granted options to purchase Common Shares and the number of Common
         Shares which each such person will be granted an option to purchase;
         provided that the aggregate number of Common Shares subject to such
         options may not exceed the number provided for in paragraph 4 of this
         Plan.

4.       Shares Subject to Option

         The aggregate number of Common Shares issuable after February 3, 1998
         pursuant to options under this Plan may not exceed 6,926,125 shares.
         The number of Common Shares issuable pursuant to options under this
         Plan shall be subject to adjustment under paragraphs 8 and 9.

         The aggregate number of Common Shares in respect of which options have
         been granted to any one person and which remain outstanding shall not
         at any time exceed 5% of the number of issued and outstanding Common
         Shares (on a non-diluted basis) at that time.

         If any option granted under this Plan, or any portion thereof, expires
         or terminates for any reason without having been exercised in full, the
         Common Shares with respect to which such option has not been exercised
         shall again be available for further options under this Plan.

5.       Option Price

         The option price under this Plan to any optionee shall be fixed by the
         Board when the option is granted and shall be not less than the fair
         market value of the Common Shares at such time which, for optionees
         resident in the United States and any other optionees designated by the
         Board, shall be deemed to be the closing price per share of the Common
         Shares on the New York Stock Exchange on the last trading day
         immediately preceding the day the option is granted and, for all other
         optionees, shall be deemed to be the closing price per share of the
         Common Shares on The Toronto Stock Exchange on the last trading day
         immediately preceding the day the option is granted; provided that, in
         either case, if the Common Shares did not trade on such exchange on
         such day the option price shall be the closing price per share on such
         exchange on the last day on which the Common Shares traded on such
         exchange prior to the day the option is granted.

6.       Terms of Option

         The period during which an option is exercisable may not exceed 10
         years from the date the option is granted, and the option agreement may
         contain provisions limiting the number of Common Shares with respect to
         which the option may be exercised in any one year. Each option
         agreement shall contain provisions to the effect that:

         a.       if the employment of an optionee as an officer or employee of
                  the Corporation or a subsidiary terminates, by reason of his
                  or her death, or if an optionee who is a retiree pursuant to
                  clause b below dies, the legal personal representatives of the
                  optionee will be entitled to exercise any unexercised options,
                  including such options that may vest after the date of death,
                  during the period ending at the end of the twelfth calendar
                  month following the calendar month in which the optionee dies,
                  failing which exercise the options terminate;

         b.       subject to the terms of clause a above, if the employment of
                  an optionee as an officer or employee of the Corporation or a
                  subsidiary terminates, by reason of retirement in accordance
                  with the then prevailing retirement policy of the Corporation
                  or subsidiary, the optionee will be entitled to exercise any
                  unexercised options, including such options as may vest after
                  the date of retirement, until the expiry date of such options
                  or the date on which such options are otherwise terminated in
                  accordance with the provisions of this Plan, failing which
                  exercise the options terminate. Notwithstanding the foregoing,
                  the Board may, at the time of grant, prescribe such shorter
                  period of time for exercise following retirement as it deems
                  appropriate;

         c.       if the employment of an optionee as an officer or employee of
                  the Corporation or a subsidiary terminates, for any reason
                  other than as provided in the preceding clauses a or b, the
                  optionee will be entitled to exercise any unexercised options,
                  to the extent exercisable at the date of such event, during
                  the period ending at the end of the calendar month immediately
                  following the calendar month in which the event occurs,
                  failing which exercise the options terminate.

                  For greater certainty and for these purposes, an optionee's
                  employment with the Corporation or a subsidiary shall be
                  considered to have terminated effective on the last day of the
                  optionee's actual and active employment with the Corporation
                  or subsidiary whether such day is selected by agreement with
                  the optionee or unilaterally by the Corporation or subsidiary
                  and whether with or without advance notice to the optionee.
                  For the avoidance of doubt, no period of notice that is given
                  or ought to have been given under applicable law in respect of
                  such termination of employment will be utilized in determining
                  an optionee's entitlement under the Plan; and

         d.       each option is personal to the optionee and is not assignable,
                  except (i) as provided in the preceding clause a, and (ii) at
                  the election of the Board, an option may be assignable to the
                  spouse, children and grandchildren of the original optionee
                  and to a trust, partnership or limited liability company, the
                  entire beneficial interest of which is held by one or more of
                  the foregoing.

         Nothing contained in the preceding clauses a, b, or c shall extend the
         period during which an option may be exercised beyond its stipulated
         expiry date or the date on which it is otherwise terminated in
         accordance with the provisions of this Plan.

         If an option is assigned pursuant to the preceding subclause (ii) of
         clause d, the references in the preceding clauses a, b and c to the
         termination of employment or death of an optionee shall not relate to
         the assignee of an option but shall relate to the original optionee. In
         the event of such assignment, legal personal representatives of the
         original optionee shall not be entitled to exercise the assigned
         option, but the assignee of the option or the legal personal
         representatives of the assignee may exercise the option during the
         applicable specified period.

7.       Exercise of Options

         Subject to the provisions of this Plan, an option may be exercised from
         time to time by delivering to the Corporation at its registered office
         a written notice of exercise specifying the number of shares with
         respect to which the option is being exercised and accompanied by
         payment in cash or certified cheque in full of the purchase price of
         the shares then being purchased.

8.       Adjustments

         Appropriate adjustments to the authorized limits set forth in paragraph
         4, in the number, class and/or type of shares optioned and in the
         option price per share, both as to options granted or to be granted,
         may be made by the Board in its discretion to give effect to
         adjustments in the number of Common Shares which result from
         subdivisions, consolidations or reclassifications of the Common Shares,
         the payment of share dividends by the Corporation, the reconstruction,
         reorganization or recapitalization of the Corporation or other relevant
         changes in the capital of the Corporation. If the Corporation sells all
         or substantially all of its assets as an entirety or substantially as
         an entirety, options under this Plan may be exercised, in whole or in
         part, at any time up to and including (but not after) a date 30 days
         following the date of completion of such sales or prior to the close of
         business on the date the option expires, whichever is earlier.

9.       Mergers

         If the Corporation proposes to amalgamate or merge with another body
         corporate, the Corporation shall give written notice thereof to
         optionees in sufficient time to enable them to exercise outstanding
         options, to the extent they are otherwise exercisable by their terms,
         prior to the effective date of such amalgamation or merger if they so
         elect. The Corporation shall use its best efforts to provide for the
         reservation and issuance by the amalgamated or continuing corporation
         of an appropriate number of shares, with appropriate adjustments, so as
         to give effect to the continuance of the options to the extent
         reasonably practicable. In the event that the Board determines in good
         faith that such continuance is not in the circumstances practicable, it
         may upon 30 days' notice to optionees terminate the options.

10.      Change of Control

         If a "change of control" of the Corporation occurs, each then
         outstanding option granted under this Plan may be exercised, in whole
         or in part, even if such option is not otherwise exercisable by its
         terms. For purposes of this paragraph 10, a change of control of the
         Corporation shall be deemed to have occurred if:

         a.       within any period of two consecutive years, individuals who at
                  the beginning of such period constituted the Board and any new
                  directors whose appointment by the Board or nomination for
                  election by shareholders of the Corporation was approved by a
                  vote of at least a majority of the directors then still in
                  office who either were directors at the beginning of the
                  period or whose appointment or nomination for election was
                  previously so approved, cease for any reason to constitute a
                  majority of the Board;

         b.       there occurs an amalgamation, merger, consolidation,
                  wind-up, reorganization or restructuring of the Corporation
                  with or into any other entity, or a similar event or series
                  of such events, other than any such event or series of
                  events which results in securities of the surviving or
                  consolidated corporation representing 50% or more of the
                  combined voting power of the surviving or consolidated
                  corporation's then outstanding securities entitled to vote
                  in the election of directors of the surviving or
                  consolidated corporation being beneficially owned, directly
                  or indirectly, by the persons who were the holders of the
                  Corporation's outstanding securities entitled to vote in the
                  election of directors of the Corporation prior to such event
                  or series of events in substantially the same proportions as
                  their ownership immediately prior to such event of the
                  Corporation's then outstanding securities entitled to vote
                  in the election of directors of the Corporation;

         c.       50% or more of the fixed assets (based on book value as shown
                  on the most recent available audited annual or unaudited
                  quarterly consolidated financial statements) of the
                  Corporation are sold or otherwise disposed of (by liquidation,
                  dissolution, dividend or otherwise) in one transaction or
                  series of transactions within any twelve month period;

         d.       any party, including persons acting jointly or in concert with
                  that party, becomes (through a take-over bid or otherwise) the
                  beneficial owner, directly or indirectly, of securities of the
                  Corporation representing 20% or more of the combined voting
                  power of the Corporation's then outstanding securities
                  entitled to vote in the election of directors of the
                  Corporation, unless in any particular situation the Board
                  determines in advance of such event that such event shall not
                  constitute a change of control; or

         e.       the Board approves and/or recommends that shareholders accept,
                  approve or adopt any transaction that would constitute a
                  change of control under clause b, c or d above.

11.      Amendment or Discontinuance of this Plan

         The Board may amend or discontinue the Plan at any time but, subject to
         paragraphs 8, 9, and 10, no such amendment may increase the aggregate
         maximum number of shares that may be subject to option under this Plan,
         change the manner of determining the minimum option price, extend the
         option period under any option beyond 10 years or, without the consent
         of the holder of the option, alter or impair any option previously
         granted to an optionee under this Plan. Amendments to the Plan require
         pre-clearance of The Toronto Stock Exchange.

12.      Evidence of Options

         Each option granted under this Plan shall be embodied in a written
         option agreement between the Corporation and the optionee which shall
         give effect to the provisions of this Plan.

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