Mid-North Signs Letter of Intent

Calgary, Alberta, May 31, 2005 – Mid-North Resources Limited (MNU – TSX Venture) announces it has entered into a letter of intent with Bison Gold Exploration Inc. ("Bison"), a private Ontario corporation, pursuant to which it is proposed Mid-North and Bison will merge. The transaction is subject to, among other things, satisfactory due diligence reviews, the entering into of a formal amalgamation agreement, regulatory approvals including the TSX Venture Exchange, and the approvals of the shareholders of Mid-North and Bison at meetings which are proposed to be held towards the end of July. The letter of intent contemplates that the common shares of Mid-North will be consolidated on a 4 for 1 basis immediately prior to the merger, and following the merger it is expected there will be approximately 20,000,000 shares outstanding of the merged entity. At the time of the merger Bison’s assets will consist of approximately $1.25 million cash which will be used to further the recent exploration programs commenced by Placer Dome on Mid-North’s 100% owned Central Manitoba properties.

For further information contact: W. Dale Dunlop, Acting President, at 902.423.8121 or Keith J. Engel, Director, at 250.491.0206.

The TSX Venture Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of this news release.