Osisko Submits Notice of Termination in Duparquet Project

MONTREAL, QUEBEC--(Marketwire - June 17, 2011) - Osisko Mining Corporation ("Osisko")(TSX:OSK)(FRANKFURT:EWX) has notified Clifton Star Resources Inc. of its decision to terminate its participation in the Duparquet Mining Camp Project in accordance with the Option and Joint Venture Agreement (the "Agreement"). Under the terms of the Agreement, a 30-day notice is required prior to the termination becoming effective.

About Osisko Mining Corporation

Osisko Mining Corporation is currently commissioning the Canadian Malartic Gold Project, evaluating adjacent areas for a large-scale open pit, bulk-tonnage mining operation and pursuing exploration of the Hammond Reef Gold Project in Northern Ontario.