Mr. John Burzynski reports

OSISKO INTERSECTS 14.9 G/T AU OVER 7.7 METRES AT GARRISON

Osisko Mining Inc. has released new results from the continuing drill program at its 100-per-cent-owned Garrison gold project located in Garrison township, Ontario. The current 20,000-metre drill program at Garrison is designed to further test the limits of the known Jonpol and Garrcon gold deposits. Three drills are currently active on site. A total of six new drill holes are reported in this release, and are presented in greater detail in the attached table.

Significant new results include:

• 14.9 grams per tonne (g/t) gold over 7.7 metres (uncut) in DDH OSK-G16-300 (8.7 g/t gold over 7.7 metres cut);
• 1.02 g/t gold over 63.3 metres in DDH OSK-G16-296.

The drill program initiated by Osisko at the Garrison project is designed to increase confidence in the historical resource estimates on the Jonpol and Garrcon deposits, as well as exploring for possible extensions of the known mineralized zones. The current results demonstrate there is good potential to increase the known mineral inventory at Jonpol through continued definition and exploratory drilling, specifically in the depth extensions of the main deposit. Historical drilling at Jonpol was limited to areas from surface to a depth of 600 metres, with much of the drilling targeting above a depth of 350 metres. Hole OSK-G16-300 represents a mineralized extension of the deposit 200 metres below the current historical resource area.

Details of significant new results are outlined in the attached table.

 
Hole                  From           To      Interval         Au           Zone
                        (m)          (m)           (m)      (g/t)
                                                      

OSK-G16-295          57.00        58.00          1.00       14.8     Green zone
                    256.00       257.00          1.00       4.18        Garrcon
                    280.50       281.50          1.00       6.80        Garrcon
                    780.00       781.00          1.00       10.7        Garrcon
OSK-G16-296          89.70       153.00         63.30       1.13        Garrcon
Including           137.00       147.00         10.00       2.37
OSK-G16-300         189.00       189.50          0.50      25.70        Garrcon
                    240.00       241.00          1.00       4.13        Garrcon
                    778.30       786.00          7.70       14.9         Jonpol
Including           781.00       781.50          0.50        195
Cut to 100 g/t      778.30       786.00          7.70       8.70


Notes:
1. For complete drilling results, please visit the company's website.
2. True widths are estimated at 65 to 80 per cent of the reported core length interval.
3. High-grade values cut to 100 g/t gold.

DDH OSK-G16-295 intersected 14.8 g/t gold over one metre, 50 metres from surface within the Green zone horizon within the hangingwall of the Munro shear zone, as well as three mineralized intervals below the Garrcon deep zone resource with up to 10.7 g/t gold over one metre. This new intercept is approximately 100 metres south of the existing deep resource.

DDH OSK-G16-296 intersected a broad zone of mineralization along the western portion of the current Garrcon resource grading 1.02 g/t gold over 63.3 metres, including 2.37 g/t over 10 metres.

DDH OSK-G16-300 intersected a series of well mineralized albite zones within the Munro shear approximately 200 metres below the existing drilling in the Jonpol deposit east zone. An interval of 14.9 g/t gold over 7.7 metres, including 195 g/t gold over 0.5 metre, was intersected approximately 200 metres below the existing Jonpol resource. This hole demonstrates the possibility of increasing the resources within the Jonpol deposit at depth.

DDH OSK-G16-297, OSK-G16-298 and OSK-G16-299 did not return significant results.

Full analytical results from the six new drill holes are available on the company's website.

Qualified person

The scientific and technical content of this press release has been reviewed, prepared and approved by Greg Matheson, PGeo, senior project manager of the Garrison gold project, who is a qualified person as defined by National Instrument 43-101 -- standards of disclosure for mineral projects.

Quality control

True widths of the new exploration intercepts reported in this press release have yet to be determined. Additional drilling is planned for the immediate area, which will enable the true width determination. Assays are uncut except where indicated. All HQ core assays reported were obtained by either whole-sample rock metallic screen/fire assay or standard 30-gram fire assaying with AA finish at SGS Mineral Services in Cochrane, Ont. The whole-sample metallic screen assay method is selected by the geologist when samples contain coarse gold or any samples displaying initial fire assay values greater than four g/t gold. Drill program design, quality assurance/quality control and interpretation of results are performed by qualified persons employing a QA/QC program consistent with National Instrument 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the company, as well as the lab. Approximately 5 per cent of sample pulps are sent to secondary laboratories for check assays.

About the Garrison project

The Garrison project area comprises 214 mineral claims, 25 mining leases and 87 patent claims encompassing approximately 8,000 hectares.

Both Garrcon and Jonpol have resource estimates that are described in a technical report prepared in accordance with National Instrument 43-101 -- standards of disclosure for mineral projects, which was completed by a previous operator Northern Gold Mining Inc. (a wholly owned subsidiary of Osisko), with an effective date of Dec. 30, 2013. The technical report was prepared by A.C.A. Howe International Ltd. for Northern Gold Mining, and is available on Osisko's website and on SEDAR under Northern Gold Mining's issuer profile.

Resource estimates were conducted by A.C.A. Howe International according to CIM standards. The Garrcon deposit estimates showed 15.1 million tonnes with an average grade of 1.07 g/t gold (521,000 ounces) in measured resources, 14.1 million tonnes averaging 1.16 g/t gold (526,000 ounces) in indicated resources and 1.7 million tonnes averaging 0.72 g/t gold (39,000 ounces) in inferred resources. Potential underground resources of 5.1 million tonnes averaging 3.49 g/t gold (577,000 ounces) in the inferred category were also outlined. Resources were reported at a cut-off grade of 0.4 g/t gold for open-pit extraction and 1.5 g/t in a bulk underground mining scenario using a gold price of $1,250 (U.S.) per ounce.

At the Jonpol deposit, resources were estimated as 870,000 tonnes averaging 5.34 g/t gold (150,000 ounces) in the indicated category and 1.07 million tonnes averaging 5.56 g/t gold (192,000 ounces) in inferred resources. Resources were reported at a cut-off grade of three g/t gold and assume an underground extraction scenario using a gold price of $1,250 (U.S.) per ounce.

Readers are cautioned that inferred resources have a great amount of uncertainty as to their existence and as to whether they can be mined economically. It cannot be assumed that all or any part of the inferred resources will ever be upgraded to a higher category. Mineral resources are not mineral reserves and do not have demonstrated economic viability.

Garrcon deposit

The Garrcon deposit has a shallow plunge eastward along the footwall of the Destor-Porcupine fault zone, with the bulk of the resource in the western, more densely drilled area. The zone is exposed at surface and has potential for open-pit bulk mining at an estimated overall stripping ratio of 1.8 to one. There is potential for additional underground resources below the pit and along the easterly plunge of the zone, which is open for further exploration downdip and along strike.

The Garrcon shaft was sunk in 1935 and 1936 by the Consolidated Mining and Smelting Company of Canada (Cominco), and the Shaft and South zones were tested for high-grade gold mineralization. Cominco drove approximately 1,430 metres of drifts and crosscuts, mining underground veins. Diamond drilling by Cominco and Lac Minerals Ltd. in the mid-to-late 1980s identified broad sections of low-grade mineralization. From 2006 to 2007, ValGold Resources Ltd. conducted additional drilling confirming these zones. From 2009 to 2013, Northern Gold Mining conducted 97,000 metres of diamond drilling, which delineated the current resource.

In 2014, Northern Gold Mining was granted a trial mining permit allowing the extraction of up to 150,000 tonnes. Northern Gold Mining mined 73,534 dry tonnes, which was processed at the nearby Holt mill facility, recovering 3,516.3 ounces at an average head grade of 1.55 g/t and recovery of 95.9 per cent. The trial production permit remains active.

Jonpol deposit

Jonpol is situated in the Munro fault zone, a west-striking splay off the north side of the Destor-Porcupine fault. Hosted in a shear zone tens of metres wide in altered mafic volcanic rocks, the deposit consists of four high-grade gold mineralized zones (JP, JD, RP and East) over a strike length of 1.7 kilometres. Gold mineralization is hosted in quartz carbonate veins, in mafic and ultramafic host rocks, and is associated with intense albite and/or sericite alteration and pyrite mineralization.

In 1997, a 49,087-tonne bulk sample was extracted from the central part of the JP zone by Hillsborough Resources Ltd. with an average grade of 6.7 g/t, which produced 9,476 ounces of gold. From 1985 to 2013, over 130,000 metres of drilling were completed on the property by previous operators. Development work on the JP zone included the sinking of a 184-metre shaft, as well as development of a ramp to the 150-metre level with mining on six sublevels. The Jonpol infrastructure underwent reclamation in the late 1990s and was closed out in 2001, but the existing ramp and shaft are preserved.

About Osisko Mining Inc.

Osisko holds a 100-per-cent interest in the high-grade Windfall Lake gold deposit located between Val d'Or and Chibougamau in Quebec. It also holds a 100-per-cent undivided interest in a large area of claims in the surrounding Urban Barry area (82,400 hectares), a 100-per-cent interest in the Marban project located in the heart of Quebec's prolific Abitibi gold mining district and properties in the Larder Lake mining division in Northeast Ontario, including the Jonpol and Garrcon deposits on the Garrison property, the Buffonta past-producing mine and the Gold Pike mine property.

We seek Safe Harbor.