June 4 2008 - Mainstream Minerals Corporation (TSX.V: MJO) is pleased to announce that all of the Directors were re-elected at the Corporation's recent Annual and Special General Meeting of Shareholders as held on May 28th, 2008 in Red Lake, ON. Subsequent to this, the Board of Directors held a board meeting to appoint Lawrence Shewchuk to the Corporation's Board of Directors. This appointment is subject to the approval of the TSX Venture Exchange Inc.

Mr. Lawrence Shewchuk

Mr. Shewchuk is a businessman, community leader and longtime resident of Red Lake, Ontario. Since the late 1960s, he has owned, and still operates, many successful private commercial enterprises in the Red Lake area, including one that was involved in the acquisition and disposition of mining claims. For 22 years, he was a licensed commercial and residential realtor and appraiser. He is currently the owner and operator of the Norseman Inn and The Red Lake Inn, both of which are located in Red Lake and are major suppliers of board and lodging services to the mining industry. His other enterprises include equipment storage and core cutting facilities. For 5 years, he was the chairman of the local Red Lake school board.

About Mainstream Minerals

Mainstream Minerals Corporation is a mineral exploration and development company focused on precious metal mining properties with economic potential, with the aim of bringing such properties to commercial production. The Company's portfolio of properties is primarily located in the prolific Red Lake Gold Camp of Northwestern Ontario. The properties include - (i) 50% of the Bobjo Mine project, (ii) 100% of the Dixie Lake North project, and (iii) 50% of the Woman Lake North of South Bay project.

Mainstream Minerals CorporationNeil SullivanPresident & CEO(204)- 222-0137Email: [email protected]...

The TSX Venture Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of this release. Some of the statements contained in this release are forward-looking statements, such as estimates and statements that describe MJO's future plans, objectives or goals, including words to the effect that MJO's management expects a stated condition or result to occur. Since forward-looking statements address future events and conditions, by their very nature, they involve inherent risks and uncertainties.

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