A shareholder who has given a proxy has the power to revoke it. If a shareholder who has given a proxy attends the AGM at which the proxy is to be voted, such shareholder, may revoke the proxy and vote at the AGM. In addition to revocation in any other manner permitted by law, a proxy may be revoked by an instrument in writing signed by the shareholder or his or her attorney authorized in writing, or, if the shareholder is a corporation, under its corporate seal and signed by a duly authorized officer or attorney for the corporation, and deposited at the registered office of TSX Trust, Dynacor’s transfer agent, at any time up to and including the last business day preceding the day of the AGM, or any adjournment thereof, at which the proxy is to be used, or with the Chair of the AGM on the day of the AGM or any adjournment thereof, and upon either of such deposits the proxy is revoked.