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CUSIP No.  685921

1	Name of Reporting Persons. I.R.S.Identification Nos. of above persons (entities only).   IAMGOLD Corporation
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a)    o (b)    x
3	SEC Use Only
4	Source of Funds (See Instructions)   WC
5	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)
6	Citizenship or Place of Organization   Canada
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power 71,428,571(1)
		8	Shared Voting Power 30,009,037(2)
		9	Sole Dispositive Power 71,428,571(1)
		10	Shared Dispositive Power
11	Aggregate Amount Beneficially Owned by Each Reporting Person   101,437,608(3)
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
13	Percent of Class Represented by Amount in Row (11)   22.9%(4)
14	Type of Reporting Person (See Instructions)   CO

(1)	Represents common shares of Orezone Resources Inc. (“Orezone”) that IAMGOLD Corporation (“IAMGOLD”) has acquired by way of a private placement in accordance with the Arrangement Agreement.

(2)

Represents common shares of Orezone that are subject to separate lock-up agreements, described below, each dated December 10, 2008, between IAMGOLD and each of Ronald Little, Michael Halvorson, Paul Carmel, David Netherway, Alain Krushinsky, Pascal Marquis, Gregory Bowes, Niel Marotta, Sean Homuth, Charles Taschereau, and MinQuest Fund I, L.P. (together, the “Shareholders”) regarding shares beneficially owned or deemed to be beneficially owned by the Shareholders (the “Lock-up Agreements”). This Schedule 13D shall not be construed as an admission by IAMGOLD that IAMGOLD is, for the purposes of Section 13(d) of the Act, the beneficial owner of any of the common shares of Orezone covered by the Lock-up Agreements.

(3)	Includes 30,009,037 common shares of Orezone beneficially owned or deemed to be beneficially owned by the Shareholders and subject to the Lock-up Agreements.

(4)

Based on 357,840,938 common shares of Orezone outstanding as represented by Orezone in the Arrangement Agreement, described below, and assuming the issuance of 13,002,308 common shares of Orezone issuable upon exercise of a convertible debenture held by a Shareholder and upon the exercise of options held by the Shareholders and the issuance of 71,428,571 common shares of Orezone pursuant to the Private Placement, as described below.