Tender Now

WEF OSUM ACQUISITION CORP OFFER TO PURCHASE FOR CASH OSUM OIL SANDS CORP.

The Offeror has engaged Kingsdale Advisors to act as the Depositary and Information Agent (the "Depositary and Information Agent") for the Offer. Registered Shareholders who wish to accept the Offer must properly complete and execute the accompanying Letter of Transmittal (printed on YELLOW paper) and deposit it, at or prior to the Expiry Time, together with certificate(s) or DRS Statement(s) representing their Common Shares and all other required documents, with the Depositary and Information Agent at its office in Toronto, Ontario at the address indicated in the Letter of Transmittal, in accordance with the instructions in the Letter of Transmittal. Alternatively, registered Shareholders may accept the Offer by (a) following the procedures for book-entry transfer of Common Shares set out in Section 3 of the Offer to Purchase, "Manner of Acceptance – Acceptance by Book-Entry Transfer", or (b) where the certificate(s) representing such Common Shares are not immediately available, or if the certificates and all of the required documents cannot be provided to the Depositary and Information Agent following the procedure for guaranteed delivery set out in Section 3 of the Offer to Purchase, "Manner of Acceptance – Procedure for Guaranteed Delivery", using the accompanying Notice of Guaranteed Delivery (printed on PINK paper), or a manually executed facsimile thereof.

Shareholders whose Common Shares are registered in the name of an investment advisor, stockbroker, bank, trust company or other nominee should immediately contact that nominee for assistance if they wish to accept the Offer in order to take the necessary steps to be able to deposit such Common Shares under the Offer. Intermediaries likely have established deposit cut-off times that are prior to the Expiry Time. Shareholders must instruct their brokers or other intermediaries promptly if they wish to deposit their Common Shares.

If you have any questions or require assistance, please contact Kingsdale Advisors, by telephone toll-free in North America at 1-866-229-8166 and outside of North America at 1-416-867-2272 or by e-mail.