TORONTO, ONTARIO–(Marketwired – May 19, 2017) – Osisko Mining Inc. (TSX:OSK) (the “Corporation“) announces that it has filed an early warning report in respect of its holdings in Barkerville Gold Mines Ltd. (“Barkerville“). On May 18, 2017, the Corporation, through its wholly-owned subsidiary O3 Investments Inc., acquired beneficial ownership of, or control and direction over, 5,324,908 units of Barkerville (the “Units” or “Purchased Securities“) by way of a non-brokered private placement with Barkerville (the “Private Placement“). Each Unit is comprised of one common share of Barkerville (each, a “Unit Share“) and one-half of one common share purchase warrant of Barkerville (each whole warrant, a “Unit Warrant“), with each Unit Warrant entitling the Corporation to purchase one additional common share of Barkerville (each, a “Common Share“) at a price of $1.30 per share for a period of 18 months following the closing date of the Private Placement.