Mr. John Burzynski reports

OSISKO INTERSECTS 2.27 G/T AU OVER 46.4 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 35,000-metre drill program (recently increased from 20,000 metres) is designed to further test the known Jonpol and Garrcon gold zones, with six drill rigs currently active on the property. A total of 22 new holes are reported in this release, with significant assay results presented in the attached table.

Significant new results include: 2.27 grams per tonne gold over 46.4 metres in OSK-G16-213X; 2.85 grams per tonne gold over 19.6 metres in OSK-G16-318; 6.66 grams per tonne gold over 6.8 metres in OSK-G16-319; 3.1 grams per tonne gold over 12 metres (4.96 grams per tonne gold over 12 metres uncut) in OSK-G16-314A; and 3.57 grams per tonne gold over eight metres in OSK-G16-209X.

The new results have demonstrated the potential for expansion of the previously defined Garrcon, Jonpol and 903 mineralized zones at the Garrison project. The continuing drill program for 2017 will continue to follow new extensions of these mineralized zones to further define the scale of mineralization at Garrison.

Maps and sections showing hole locations and complete drilling results are available at the company's website.

Hole No.          From         To   Interval       Au uncut    Au cut to 30 g/t       Zone
                                                       (g/t)               (g/t)

OSK-G16-209X     602.0      610.0        8.0           3.57                        Garrcon
Including        609.0      610.0        1.0           22.0
                 844.8      847.0        2.2           19.4                 6.8
Including        845.6      846.1        0.5           85.5                30.0
OSK-G16-213X     540.6      587.0       46.4           2.27                        Garrcon
                 744.0      746.0        2.0           13.1
Including        744.0      745.0        1.0           26.0
OSK-G16-301      716.4      720.4        4.0           2.72                        Garrcon
OSK-G16-303      937.2      944.8        7.6           2.44                        Garrcon
OSK-G16-304      403.0      437.9       34.9           1.26                        Garrcon
Including        423.5      436.0       12.5           2.40
OSK-G16-310      332.0      335.6        3.6           2.00                        Garrcon
OSK-G16-314      107.0      110.0        3.0           19.2                 4.7    Garrcon
Including        108.9      109.3        0.4            139                30.0
OSK-G16-314A     230.0      242.0       12.0           4.96                 3.1    Garrcon
Including        230.0      231.0        1.0           51.9                30.0
                 277.0      307.0       30.0           1.52
                 744.3      746.0        1.7           4.98                         Jonpol
                 849.8      850.8        1.0           5.60                         Jonpol
OSK-G16-306     677.75      686.5        8.8           3.20                         Jonpol
OSK-G16-308      995.6    1,003.5        7.9           3.40                         Jonpol
Including        995.6      996.6        1.0            9.4
Including      1,002.5    1,003.5        1.0           15.5
OSK-G16-315      919.0      936.0       17.0           1.08                         Jonpol
OSK-G16-316      845.4      848.0        2.6           3.83                         Jonpol
OSK-G16-305      169.7      184.6       14.9           0.88                            903
OSK-G16-313       30.0       36.1        6.1           1.78                            903
                  95.0       97.0        2.0           5.55                            903
OSK-G16-316       61.8       63.8        2.0           29.9                12.8        903
Including         61.8       62.4        0.6           87.0                30.0        903
OSK-G16-318      173.6      193.2       19.6           2.85                            903
Including        183.0      184.0        1.0           12.3
OSK-G16-319      127.2      134.0        6.8           6.66                            903
                 193.0      207.0       14.0           2.12
Including        198.0      199.0        1.0           11.6
                 296.5      304.0        7.5           1.47                            903
OSK-G16-320       90.0      108.3       18.3           0.98                            903

Notes: True widths are estimated at 65 per cent to 80 per cent of the
reported core length interval.

Hole OSK-G16-209X tested the Garrcon zone 50 metres west of the pre-2016 drilling, returning 3.57 grams per tonne gold over eight metres within a broad quartz carbonate breccia hosted in metasediments. A second new zone was intersected at a vertical depth of 840 metres returning 2.2 metres averaging 19.4 grams per tonne gold uncut (2.2 metres averaging 6.8 grams per tonne gold cut), including 85.5 grams per tonne gold over 0.5 metre.

Hole OSK-G16-213X targeted the Garrcon zone between two historic drill holes, returning a broad interval of 46.4 metres averaging 2.27 grams per tonne gold within a quartz carbonate breccia, hosted in metasediments (corresponding to a zone intersected in historic drilling and hole OSK-G16-209x located 150 metres to the west). The hole also intersected 26 grams per tonne gold over one metre in a second intercept at vertical depth of 740 metres.

Hole OSK-G16-301 tested the strike extension of the Garrcon zone 400 metres east of the current resource area and 160 metres below historical drilling. The hole returned 2.72 grams per tonne gold over four metres.

Hole OSK-G16-302 targeted the Jonpol zone, returning 3.46 grams per tonne gold over 0.5 metre. Hole OSK-G16-303 targeted the Jonpol zone, returning 2.44 grams per tonne gold over 7.6 metres. Hole OSK-G16-304 intersected 1.26 grams per tonne gold over 34.9 metres, 550 metres east and along strike of the Garrcon zone.

Hole OSK-G16-305 tested the 903 zone (south), intersecting 0.88 gram per tonne gold over 14.9 metres. This new mineralized horizon is hosted within a thin unit of silicified and pyrite-mineralized metasediments similar to the Garrcon zone 1,200 metres to the east.

Hole OSK-G16-306 intersected 3.2 grams per tonne gold over 8.8 metres below the Jonpol zone, 100 metres above previously reported hole OSK-G16-300 (which returned 14.9 grams per tonne gold over 7.7 metres). The zone shows a very strong correlation and continuity with the mineralized zones encountered in holes OSK-G16-300, OSK-G16-303 and OSK-G16-308.

Hole OSK-G16-308 was drilled 350 metres below the Jonpol zone, 150 metres below previously reported hole OSK-G16-300. The hole intersected 3.4 grams per tonne gold over 7.9 metres and is interpreted to correlate with the zone intercepted in hole OSK-G16-300.

Hole OSK-G16-310 was drilled 100 metres east of hole OSK-G16-304 along the strike extension of the Garrcon zone, intersecting similar geology to hole OSK-G16-304, returning two grams per tonne gold over 3.6 metres.

Hole OSK-G16-313 hit two shallow intersections of 6.1 metres averaging 1.78 grams per tonne gold and 5.55 grams per tonne gold over two metres in syenite, similar to the nearby 903 zone. The new intercepts demonstrate the potential for additional syenite-hosted zones within the southwestern portion of the Garrison property.

Hole OSK-G16-314 intersected 30 grams per tonne gold over 0.4 metre (139 grams per tonne gold over 0.4 metre uncut) within the Garrcon zone. Hole OSK-G16-314A intersected 3.14 grams per tonne gold over 12 metres (4.96 grams per tonne gold over 12 metres uncut) and a second interval of 1.52 grams per tonne gold over 30 metres in the Garrcon zone. The hole also successfully identified mineralization 100 metres below the Jonpol zone, intersecting 4.98 grams per tonne gold over 1.7 metres and a second interval returning 5.6 grams per tonne gold over one metre.

Hole OSK-G16-315 targeted the western extension of the Jonpol zone, intersecting a broad zone of mineralization averaging 1.08 grams per tonne gold over 17 metres.

Hole OSK-G16-316 intersected a new zone near the top of the hole hosted in syenite (and analogous to the nearby 903 zone style of mineralization) extending the footprint of the 903 zone (north). Within the 903 zone, the hole intersected 29.9 grams per tonne gold over two metres and within the Jonpol zone intersected 3.83 grams per tonne gold over 2.6 metres.

Hole OSK-G16-318 was the first drill hole of the current drilling campaign to target expansion of the 903 zone (syenite). The hole intersected 2.85 grams per tonne gold over 19.6 metres. The 903 zone (syenite) lies within the west extension of the Destor-Porcupine fault zone within the Garrison property.

Hole OSK-G16-319 targeted the 903 zone syenite 100 metres west of hole OSK-G16-318 and intersected 6.66 grams per tonne gold over 6.8 metres and a second mineralized intercept averaging 2.12 grams per tonne gold over 14 metres, as well as a third intercept returning 1.47 grams per tonne gold over 7.5 metres. This hole shows good correlation and continuity with hole OSK-G16-318 and historic drilling.

Hole OSK-G16-320 was aimed at investigating the previously untested 903 zone (north horizon) and intersected 0.98 gram per tonne gold over 18.3 metres.

Hole OSK-G16-307 did not intersect any significant mineralization. Hole OSK-G16-309 was abandoned prior to reaching target. Hole OSK-G16-311 did not intersect any significant mineralization.

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, and calculated intervals are reported over a minimum length of two metres using a lower cut-off of three grams per tonne gold. 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 Minerals Services in Cochrane, Ont. The whole-sample-rock metallic screen assay method is selected by the geologist when samples contain coarse gold or any samples displaying gold initial fire assay values greater than four grams per tonne gold. Drill program design, quality assurance/quality control and interpretation of results are performed by qualified persons employing a quality assurance/quality control program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for quality assurance/quality control purposes by the corporation, 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 NI 43-101, which was completed by a previous operator, Northern Gold Mining Inc. (titled "Technical Report on the Golden Bear Project -- Garrison Property: Larder Lake Mining Division, Garrison Township, Ontario, Canada"), dated Dec. 30, 2013, with an effective date of Dec. 30, 2013. The Garrison technical report was prepared by ACA Howe International Ltd. for Northern Gold Mining (a wholly owned subsidiary of Osisko) and is available on Osisko's website and on SEDAR under Northern Gold Mining's issuer profile on SEDAR.

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

At the Jonpol zone, resources were estimated as 870,000 tonnes averaging 5.34 grams per tonne gold (150,000 ounces) in the indicated category and 1.07 million tonnes averaging 5.56 grams per tonne gold (192,000 ounces) in inferred resources. Resources were reported at a cut-off grade of three grams per tonne 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 zone

The Garrcon zone 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 1.8:1. There is potential for additional underground resources below the pit and along the easterly plunge of the zone, which is open for further exploration down dip and along strike.

The Garrcon shaft was sunk in 1935 and 1936 by the Consolidated Mining and Smelting Co. 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-1980s to late 1980s identified broad sections of low-grade mineralization. In 2006-2007, Valgold Resources Ltd. conducted additional drilling confirming these zones. From 2009 to 2013, Northern Gold Mining Inc. 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 were processed at the nearby Holt mill facility recovering 3,516.3 ounces at an average head grade of 1.55 grams per tonne gold and recovery of 95.9 per cent. The trial production permit remains active.

Jonpol zone

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 and 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 grams per tonne gold, which produced 9,476 ounces gold. From 1985 to 2013, over 130,000 metres of drilling was 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

Osisko holds a 100-per-cent interest in the high-grade Windfall Lake gold deposit located between Val d'Or and Chibougamau in Quebec and holds a 100-per-cent undivided interest in a large area of claims in the surrounding Urban Barry area (82,400 hectares), as well as 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 Northeastern Ontario, including the Garrcon and Jonpol zones on the Garrison property, the Buffonta past-producing mine and the Gold Pike mine property. The corporation also holds interests and options in a number of additional properties in Northern Ontario. Osisko continues to be well financed and has approximately $90-million in cash and cash equivalents, as well as equity investments of approximately $50-million.

We seek Safe Harbor.