Adoption of 2009 Performance Option Plan

On February 20, 2009, the Board adopted a new performance option plan (the "2009 Performance Option Plan"), subject to the approval of the 2009 Performance Option Plan by the Corporation's shareholders at the Meeting. If approved, the 2009 Performance Option Plan will be deemed effective as of January 1, 2009 (the "Effective Date") and will permit the grant of options to purchase up to 1,000,000 Shares to individual officers and employees of the Corporation and its subsidiaries. Non-employee directors and other non-employee contractors and third party vendors will not be eligible to participate in the 2009 Performance Option Plan.

Options to purchase Shares may be granted under the terms of the 2009 Performance Option Plan only during 2009 and no options will be granted prior to the Meeting. Unless sooner terminated as provided therein, the 2009 Performance Option Plan will terminate one year from the Effective Date, although the terms of the plan will continue to govern options granted thereunder prior to termination.

The 2009 Performance Option Plan will be administered by the Compensation Committee or any other Board Committee designated by the Board. A copy of the 2009 Performance Option Plan is in Appendix C. This description of the 2009 Performance Option Plan is qualified, in its entirety, by the terms of the attached plan document.

If approved, the 2009 Performance Option Plan will result in up to 0.34% (as at February 20, 2009) of the outstanding share capital of the Corporation being available for issue pursuant to the exercise of options granted under the 2009 Performance Option Plan. The aggregate number of Shares in respect of which stock options may be granted to any one person pursuant to the 2009 Performance Option Plan and which remain outstanding may not at any time exceed 250,000 Shares, representing 0.09% (as at February 20, 2009) of the outstanding share capital of the Corporation.

Under the terms of the 2009 Performance Option Plan, options will generally have a term of ten years, except that if the term expires during a blackout period applicable to a relevant optionee, or within 10 trading days after the expiration of the blackout period applicable to the relevant optionee, the term shall expire on the tenth trading day after the end of such blackout period. For purposes of the 2009 Performance Option Plan, "blackout period" refers to any period during which the relevant optionee is prohibited by the Corporation's trading policy from trading in the Corporation's securities.

Options will vest at the end of the three-year performance cycle ending December 31, 2011, subject to the Corporation's achievement of the performance criteria described in the 2009 Performance Option Plan. The performance metrics and vesting scale have been designed in accordance with the Corporation's compensation philosophy. See "Compensation Discussion and Analysis". In general, options will vest as determined by a schedule that references the Corporation's performance during the performance cycle as measured by reference to cash flow return on investment and weighted average cost of capital. Any options that do not become vested will terminate at the end of the performance cycle.

The number of options granted to each individual optionee will be targeted to deliver total compensation in the upper quartile of the Comparator Group for corporate performance, based on cash flow return on investment and weighted average cost of capital, above the 75th percentile of the Dow Jones U.S. Basic Materials Index ("DJUSBMI"). Similarly, for corporate performance at the 50th percentile of the DJUSBMI, the number of options granted will be targeted to deliver total compensation at the median of the Comparator Group.

It is anticipated that there will be approximately 260 participants in the 2009 Performance Option Plan. Following shareholder approval of the 2009 Performance Option Plan at the Meeting, a determination will be made as to the number of options to be granted to executive officers and other participants, which options will be granted in accordance with the criteria described below.

The option price for any option granted under the 2009 Performance Option Plan to any optionee shall be fixed by the Board when the option is granted and, for optionees resident in the United States and any other optionees designated by the Board, the option price shall not be less than the fair market value of a Share at such time, which shall be deemed to be the closing price per Share on the NYSE on the last trading day immediately preceding the day the stock option is granted. For all other optionees, the option price shall be deemed to be the closing price per Share on the TSX on the last trading day immediately preceding the day the stock option is granted. In either case, if the 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 Shares traded on such exchange prior to the day the stock option is granted.

The 2009 Performance Option Plan requires all options to be subject to provisions to the effect that:

Nothing contained in paragraphs (a), (b) or (c) above shall extend the period during which a stock option may be exercised beyond its term, or any earlier date on which it is otherwise terminated in accordance with the provisions of the 2009 Performance Option Plan.

If a stock option is assigned pursuant to paragraph (d)(ii) above, the references in paragraphs (a), (b) and (c) above to the termination of employment or death of an optionee shall not relate to the assignee of a stock 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 stock option, but the assignee of the stock option or the legal personal representatives of the assignee may exercise the stock option during the applicable specified period.

The Board may amend or discontinue the 2009 Performance Option Plan at any time, without obtaining approval of the shareholders of the Corporation unless required by the relevant rules of the TSX, provided that no such amendment may increase the aggregate maximum number of Shares that may be subject to stock options granted under the 2009 Performance Option Plan, change the manner of determining the minimum option price, extend the option term under any option beyond ten years (or the date on which the option would otherwise expire under the plan), expand the assignment provisions of the 2009 Performance Option Plan, permit non-employee directors to participate in the 2009 Performance Option Plan or, without the consent of the holder of the option, alter or impair any option previously granted to an optionee under the 2009 Performance Option Plan; and provided further, for greater certainty, that, without the prior approval of the Corporation's shareholders, stock options issued under the 2009 Performance Option Plan shall not be repriced, replaced or regranted through cancellation, or by lowering the option price of a previously granted stock option. In the event of certain transactions affecting the capitalization of the Corporation, including a merger, the Board shall make appropriate adjustments in the number or option price of outstanding options or the number of Shares available for grant and other authorized limits under the 2009 Performance Option Plan to reflect such transaction.

If a change of control (as defined in the 2009 Performance Option Plan) occurs and either (1) the successor fails to assume the Corporation's obligations under the 2009 Performance Option Plan or fails to convert or replace stock options granted thereunder with equivalent options, or (2) during the two years following the change of control, the optionee is terminated without Cause (as defined in the 2009 Performance Option Plan) or the optionee resigns employment for Good Reason (as defined in the 2009 Performance Option Plan), all unvested options then outstanding will become fully vested. Each stock option granted under the 2009 Performance Option Plan to an optionee that participates in the Corporation's Medium-Term Incentive Plan will be subject to the terms and conditions of the Corporation's Policy on Recoupment of Unearned Compensation, which is described in the section "Compensation".

A participant in the 2009 Performance Option Plan who is employed and resident in Canada will be deemed to receive a benefit from employment in the year he or she exercises options under the 2009 Performance Option Plan equal to the difference between the exercise price and the market price of the Shares at the time of exercise, multiplied by the number of Shares over which options are exercised. One-half of this amount will be deducted in the participant's taxable income in the year of exercise. If the participant so elects, and subject to certain limitations, taxation of the said benefit may be deferred from the year of exercise until the earliest of the year the participant disposes of the Shares, dies or ceases to be resident in Canada for tax purposes. The participant will have a cost base in the optioned Shares equal to their market value on the date of exercise for purposes of computing any capital gain or capital loss on any subsequent disposition of the Shares. The Corporation may not take any tax deduction in respect of the benefits deemed to be received by participants under the 2009 Performance Option Plan in Canada.

All of the options granted under the 2009 Performance Option Plan will be treated as non-qualified stock options for U.S. federal income tax purposes. A participant in the 2009 Performance Option Plan who is employed and resident in the U.S. will not be deemed to receive any income at the time an option is granted, nor will the Corporation's applicable subsidiary be entitled to a deduction at that time. However, when any part of an option is exercised, the participant will be deemed to have received ordinary income in an amount equal to the difference between the exercise price of the option and the fair market value of the Shares received on the exercise of the option. The Corporation's applicable subsidiary will be entitled to a tax deduction in an amount equal to the amount of ordinary income realized by such participants. Upon any subsequent sale of the Shares acquired upon the exercise of an option, any gain (the excess of the amount received over the fair market value of the Shares on the date ordinary income was recognized) or loss (the excess of the fair market value of the Shares on the date ordinary income was recognized over the amount received) will be a long-term capital gain or loss if the sale occurs more than one year after such date of recognition and otherwise will be a short-term capital gain or loss.

Grants under the 2009 Performance Option Plan will be made after shareholder approval is obtained and during the 2009 fiscal year.

In order for the 2009 Performance Option Plan to become effective, the resolution to approve the 2009 Performance Option Plan must be passed by a majority of the votes cast by the shareholders who vote in respect of the resolution.

UNLESS A PROXY SPECIFIES THAT THE SHARES IT REPRESENTS SHOULD BE VOTED AGAINST THE RESOLUTION TO APPROVE THE 2009 PERFORMANCE OPTION PLAN, THE PROXY-HOLDERS NAMED IN THE ACCOMPANYING FORM OF PROXY INTEND TO VOTE FOR THE RESOLUTION.

Securities Authorized for Issuance Under Equity Compensation Plans

The Corporation has six other stock option plans. On May 8, 2008, the Corporation's shareholders approved the 2008 Performance Option Plan under which the Corporation was permitted, after February 20, 2008 and before January 1, 2009 to grant options for the issuance of up to 1,000,000 Shares pursuant to the exercise of the options. As at January 1, 2009, options to acquire 485,500 Shares had been granted and were outstanding under the 2008 Performance Option Plan. Grants under the 2008 Performance Option Plan were made during fiscal year 2008 only. The material terms of the 2008 Performance Option Plan are described in "Compensation Discussion and Analysis — Incentive Plan Compensation — Long-Term Incentives (Stock Options)". Additional information regarding the 2008 Performance Option Plan can be found in the Corporation's Management Proxy Circular for the fiscal year ended 2007. No amendments with respect to the 2008 Performance Option Plan have been adopted since the beginning of the last fiscal year.

On May 3, 2007, the Corporation's shareholders approved the 2007 Performance Option Plan under which the Corporation was permitted, after February 20, 2007 and before January 1, 2008, to grant options for the issuance of up to 3,000,000 Shares pursuant to the exercise of the options. As at January 1, 2009, options to acquire 1,714,050 Shares had been granted and were outstanding under the 2007 Performance Option Plan. Grants under the 2007 Performance Option Plan were made during fiscal year 2007 only. The material terms of the 2007 Performance Option Plan are described in "Compensation Discussion and Analysis — Incentive Plan Compensation — Long-Term Incentives (Stock Options)". Additional information regarding the 2007 Performance Option Plan can be found in the Corporation's Management Proxy Circular for the fiscal year ended 2006. No amendments with respect to the 2007 Performance Option Plan have been adopted since the beginning of the last fiscal year.

On May 4, 2006, the Corporation's shareholders approved the 2006 Performance Option Plan under which the Corporation was permitted, after February 27, 2006 and before January 1, 2007, to grant options for the issuance of up to 4,200,000 Shares pursuant to the exercise of the options. As at January 1, 2009, options to acquire 2,659,800 Shares had been granted and were outstanding under the 2006 Performance Option Plan. Grants under the 2006 Performance Option Plan were made during fiscal year 2006 only. The material terms of the 2006 Performance Option Plan are described in the "Compensation Discussion and Analysis — Incentive Plan Compensation — Long-Term Incentives (Stock Options)". Additional information regarding the 2006 Performance Option Plan can be found in the Corporation's Management Proxy Circular for the fiscal year ended 2005. No amendments with respect to the 2006 Performance Option Plan have been adopted since the beginning of the last fiscal year.

On May 5, 2005, the Corporation's shareholders approved the 2005 Performance Option Plan under which the Corporation was permitted, after February 28, 2005 and before January 1, 2006, to grant options for the issuance of up to 3,600,000 Shares pursuant to the exercise of the options. As at January 1, 2009, options to acquire 2,684,864 Shares had been granted and were outstanding under the 2005 Performance Option Plan. Grants under the 2005 Performance Option Plan were made during fiscal year 2005 only. The material terms of the 2005 Performance Option Plan are described in the "Compensation Discussion and Analysis — Incentive Plan Compensation — Long-Term Incentives (Stock Options)". Additional information regarding the 2005 Performance Option Plan can be found in the Corporation's Management Proxy Circular for the fiscal year ended 2004. No amendments with respect to the 2005 Performance Option Plan have been adopted since the beginning of the last fiscal year.

The Corporation's Stock Option Plan — Officers and Employees and Stock Option Plan — Directors were each terminated by the Board on November 16, 2006. Options previously granted under the Stock Option Plan — Officers and Employees and Stock Option Plan — Directors will continue to be governed by the terms of their respective plan. As at January 1, 2009, 5,048,242 options were outstanding under the Stock Option Plan — Officers and Employees and 257,900 options were outstanding under the Stock Option Plan — Directors. No amendments with respect to the Stock Option Plan — Officers and Employees and the Stock Option Plan — Directors have been adopted since the beginning of the last fiscal year.

The following table provides information about securities that may be issued under the Corporation's existing equity compensation plans, as of December 31, 2008 and February 20, 2009.

Equity Compensation Plan Information