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MONTREAL, QUEBEC -- (Marketwire) -- 01/30/13 -- Osisko Mining Corporation (TSX: OSK)(FRANKFURT: EWX) is pleased to announce results from the ongoing diamond drill program at the Upper Beaver gold project located in Kirkland Lake, Ontario. The Upper Beaver project is 100% owned by Osisko Mining Ltd., a wholly-owned subsidiary of Osisko.

Highlights from the new holes include 5.5g/t Au over 54.0 metres, including 18.7 g/t Au with 1.9% Cu over 11.0 metres (infill hole UB12-262W3); 16.9 g/t Au over 13.0 metres (infill hole UB12-262W2); and 27.7 g/t Au over 4.0 metres (hole UB12-269W1) in a new step-out.

The tabled results (see below) represent 30 new (and wedge) holes (19,883 metres total drilling) completed in Q4 2012 as part of the in-fill resource definition and step-out exploration program at Upper Beaver.

In-fill Resource Definition

In-fill drilling continues to confirm the continuity and high-grade nature of the core of the deposit. Seven wedge holes on the west portion of the deposit intersected significant mineralization. One hole and three wedges at the -700 m elevation of the deposit returned intervals in the Porphyry Zone assaying 12.8 g/t Au with 0.87% Cu over 9.0 m (including 36.8 g/t Au with 1.48% Cu over 3.0 m) in hole UB12-262; 1.9 g/t Au with 0.18% Cu over 22.7 m in hole UB12-262W1; 16.9 g/t Au with 0.20% Cu over 13.0 m (including 89.9 g/t Au with trace Cu over 2.0 m) in hole UB12-262W2; and 5.5 g/t Au with 0.6% Cu over 54.0 m in hole UB12-262W3. The thick interval in UB12-262W3 includes three sub-zones, 18.7 g/t Au with 1.9% Cu over 11.0 m, 2.3 g/t Au with 0.4% Cu over 14.0 m and 6.5 g/t Au with 0.4% Cu over 7.0 m.

Four wedge holes between -900 m and -1100 m intersected the Porphyry Zone, returning 15.1 g/t Au with 0.6% Cu over 3.0 m (hole UB12-161W9); 3.2 g/t Au with 0.7% Cu over 11.0 m (hole UB12-161W10); 4.2 g/t Au with 0.4% Cu over 6.0 m (hole UB12-161W11); and 3.6 g/t Au with trace Cu over 5.0 m (hole UB12-161W12).

Four holes targeted the Porphyry Zone on the east portion of the deposit. Holes UB12-254 and UB12-254W1 intersected the zone at -600 m below surface, respectively assaying 3.1 g/t Au with 0.3% Cu over 26.0 m (including 9.7 g/t Au with 0.3% Cu over 6.0 m), and 12.6 g/t Au with 0.2% Cu over 6.0 m. Near -400 m depth, hole UB12-259 returned 1.5 g/t over 7.0 m, and UB12-263 returned 4.0 g/t Au over 10.0 m (including 7.1 g/t Au over 5.0 m).

Step-out Exploration

Exploration drilling has intersected significant mineralization east and west of the deposit. Seven wedge holes intersected significant mineralization from near surface to -500 m approximately 50 m west of the existing mineral resource. Significant intersections include 27.7 g/t Au over 4.0 m (hole UB12-269W1); 41.6 g/t Au over 1.0 m and 9.1 g/t Au with 1.1% Cu over 2.0 m (hole UB12-260); 11.0 g/t Au over 1.0 m and 6.2 g/t Au over 4.0 m (hole UB12-265); 10.5 g/t Au over 1.0 m (hole UB12-269); and 0.9 g/t Au with 0.4% Cu over 19.0 m (hole UB12-257).

Six wedge holes intersected significant mineralization (expanding the footprint of the deposit) approximately 100 m - 300 m east of the known mineral resource. Significant intersections returned 5.6 g/t Au over 6.0 m and 3.4 g/t Au over 10.0 m (hole UB12-250W1) at a depth of -700 m; 4.8 g/t Au over 4.0 m (hole UB12-270) near - 150 m depth; and 18.2 g/t Au over 1.0 m (hole UB12-274) near -150 m depth.