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MONTREAL, QUEBEC -- (Marketwire) -- 03/21/13 -- Osisko Mining Corporation (TSX: OSK)(FRANKFURT: EWX) ("Osisko") is pleased to announce that new drilling at the Upper Beaver gold project located in Kirkland Lake, Ontario has led to the discovery of two new gold-copper zones.
The following intersections highlight high-grade results from the two new discoveries:
-- East Basalt Zone Discovery: 9.3 g/t Au with 1.7% Cu over 18.1 metres (hole UB13-284) and 2.2 g/t Au with 0.5% Cu over 17.8 metres (hole UB13- 287);-- North Q Zone Discovery: 11.0 g/t Au with 1.6% Cu over 2.0 metres (hole UB13-282);
Additional new results from infill drilling on previously known mineralized zones include the following highlights: 3.2 g/t Au with 0.8% Cu over 30.0 metres (UB13-278), 16.1 g/t Au with 8.8% Cu over 3.0 metres and 11.4 g/t Au with 3.3% Cu over 3.0 metres (hole UB13-280) from the North Basalt Zone and 5.4 g/t Au with 0.5% Cu over 59.0 metres (hole UB13-262W4) from the Porphyry West Zone.
The table below outlines the results of 10 new holes completed in 2013 as part of the ongoing exploration and in-fill resource definition drill program at Upper Beaver:
----------------------------------------------------------------------------Hole # From (m) To (m) Interval (m) Cu (%) Au (g/t) Zone----------------------------------------------------------------------------New zones----------------------------------------------------------------------------UB13-279 92.0 93.0 1.0 0.22 0.81 East Basalt----------------------------------------------------------------------------UB13-281 120.0 123.0 3.0 0.18 3.16 East Basalt----------------------------------------------------------------------------UB13-284 147.0 165.1 18.1 1.70 9.30 East Basalt----------------------------------------------------------------------------including 154.0 165.1 11.1 2.75 13.05 East Basalt----------------------------------------------------------------------------UB13-287 170.0 187.8 17.8 0.50 2.20 East Basalt----------------------------------------------------------------------------UB13-282 174.0 177.0 3.0 0.89 2.34 North Q----------------------------------------------------------------------------and 185.0 192.0 7.0 trace 1.28 North Q----------------------------------------------------------------------------and 264.0 272.0 8.0 0.56 3.20 North Q----------------------------------------------------------------------------including 269.0 271.0 2.0 1.57 11.00 North Q----------------------------------------------------------------------------and 311.0 322.0 11.0 0.59 0.91 North Q----------------------------------------------------------------------------UB13-288 177.0 182.0 5.0 0.12 1.46 North Q----------------------------------------------------------------------------and 196.0 199.0 3.0 1.53 2.56 North Q----------------------------------------------------------------------------and 277.0 291.0 14.0 0.30 1.84 North Q----------------------------------------------------------------------------including 280.0 284.0 4.0 0.75 4.40 North Q----------------------------------------------------------------------------Infill holes----------------------------------------------------------------------------UB13-262W4 Infill - 812.0 871.0 59.0 0.53 5.43 Porphyry West----------------------------------------------------------------------------including Infill - 829.0 844.0 15.0 1.03 14.60 Porphyry West----------------------------------------------------------------------------UB13-276 333.0 334.0 1.0 1.32 4.83 North Basalt----------------------------------------------------------------------------and 423.0 427.0 4.0 trace 1.48 North Basalt----------------------------------------------------------------------------UB13-278 360.0 390.0 30.0 0.80 3.20 North Basalt----------------------------------------------------------------------------including 364.0 368.0 4.0 1.70 9.70 North Basalt----------------------------------------------------------------------------and 370.0 380.0 10.0 0.90 2.80 North Basalt----------------------------------------------------------------------------and 385.0 390.0 5.0 1.00 3.80 North Basalt----------------------------------------------------------------------------UB13-280 447.0 450.0 3.0 8.81 16.10 North Basalt----------------------------------------------------------------------------and 479.0 482.0 3.0 3.23 11.40 North Basalt----------------------------------------------------------------------------



