Osisko Intersects 16.1 g/t Au Over 8.3 Metres at Garrison

(Toronto, January 31, 2018).  Osisko Mining Inc. (OSK:TSX, “Osisko” or the “Corporation”) is pleased to announce new results from the 2017 drill program at its 100% owned Garrison gold project located in Garrison Township, Ontario.  Over 80,000 metres of new drilling have been conducted by Osisko on the Garrison Project since its acquisition in late 2015.  A total of twenty-eight new intercepts in nine holes are reported in this release, with significant assay results presented in the table below.

Significant new results include:  16.1 g/t Au over 8.3 metres in OSK-G17-454; 3.02 g/t Au over 23.2 metres and 1.52 g/t Au over 50.0 metres in OSK-G17-389; 5.32 g/t Au over 12.6 metres in OSK-G17-459; and 8.11 g/t Au over 2.4 metres in OSK-G17-462.

The new results continue to show the increasing potential of the 903 Zone with proven extension towards SW, NW and South and to confirm the extent of known mineralization in the Garrcon Zone. Maps and sections showing hole locations and complete drilling results are available at www.osiskomining.com

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

30 g/t
Zone
OSK-G17-361 60.0 68.0 8.0 1.05   903
  77.0 85.0 8.0 0.87   903
  99.4 104.6 5.2 1.48   903
OSK-G17-389 101.5 124.7 23.2 3.02   Garrcon
including 105.0 106.0 1.0 17.8   Garrcon
and 115.0 120.0 5.0 7.38   Garrcon
  181.2 194.0 12.8 1.00   Garrcon
  326.0 327.0 1.0 9.03   Garrcon
  470.0 475.0 5.0 1.46   Garrcon
  514.0 517.0 3.0 1.99   Garrcon
  537.0 587.0 50.0 1.52   Garrcon
including 542.0 561.0 19.0 2.97   Garrcon
OSK-G17-396 48.6 64.6 16.0 1.03   903
  220.2 221.2 1.0 7.12   903
OSK-G17-443 202.2 207.0 4.8 1.06   Garrcon
  186.5 192.0 5.5 0.77   Garrcon
  196.0 198.4 2.4 1.37   Garrcon
  373.2 375.0 1.8 1.32   Garrcon
  481.5 483.6 2.1 1.65   Garrcon
OSK-G17-448 370.7 390.6 19.9 0.93   903
including 381.7 390.6 8.9 1.34   903
  469.0 476.0 7.0 1.00   903
OSK-G17-454 67.0 75.3 8.3 16.1 14.9 903
  76.0 79.0 3.0 2.98   903
  96.7 102.6 5.9 1.76   903
OSK-G17-458 40.0 45.0 5.0 1.03   903
  53.2 60.3 7.1 1.22   903
OSK-G17-459 79.0 95.2 16.2 1.21   903
  105.0 117.6 12.6 5.32   903
including 109.3 113.0 3.7 11.5   903
  232.0 234.3 2.3 5.92   903
OSK-G17-462 58.0 61.0 3.0 3.26   903
  69.6 72.0 2.4 8.11   903

Notes:  True Widths are estimated at 65 – 90% of the reported core length interval.  See “Quality Control” below.

Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-G17-361 340 -45 235 577349 5373273 2650W
OSK-G17-389 0 -90 841 578669 5373887 1200W
OSK-G17-396 340 -45 233 576986 5373248 3000W
OSK-G17-443 340 -50 530 578658 5373771 1250W
OSK-G17-448 340 -50 300 577620 5373112 2450W
OSK-G17-454 340 -45 219 577264 5373214 2750W
OSK-G17-458 340 -45 181 577294 5373280 2700W
OSK-G17-459 340 -45 223 577310 5373232 2700W
OSK-G17-462 340 -45 370 576681 5373209 3300W

 

OSK-G17-361 was drilled at the eastern part of the 903 Zone and intercepted three mineralized intervals: 1.05 g/t Au over 8.0 metres, 0.87 g/t Au over 8.0 metres, and 1.48 g/t Au over 5.2 metres. The three zones correspond to syenite dykes with quartz veining and sulfides near their contacts with fuchsite altered ultramafic rocks.

OSK-G17-389 was a vertical hole drilled at the central part of the Garrcon Zone, intercepting the deep Garrcon mineralized zone. Six mineralized zones were intercepted including 3.02 g/t Au over 23.3 metres, shallow mineralization associated with zones of intense fracturing and quartz veining with albite, sericite and iron carbonate alteration. A second mineralized zone averaged 1.0 g/t Au over 12.8 metres with the same mineralization style. A third mineralized zone returned 9.03 g/t Au over 1.0 metre associated with a small zone of sericite – iron carbonate alteration with discrete quartz veins. Three additional deeper mineralized zones returned 1.46 g/t Au over 5.0 metres, 1.99 g/t Au over 3.0 metres, and 1.52 g/t Au over 50.0 metres. This deeper mineralization is associated with vein-breccia structures with sericitic alteration and occasional crustiform quartz-carbonate veins.

OSK-G17-396 was drilled in the central part of the 903 Zone where it intercepted two significant mineralized zones, the first averaging 1.03 g/t Au over 16.0 metres associated with the upper part of a syenite dyke with albitic alteration, quartz-carbonate veining, and pyrite dissemination;  and the second averaging 7.12 g/t Au over 1.0 meter, associated with the contact between ultramafic rocks and a thin deformed layer of Temiskaming sediments.

OSK-G17-443 targeted the Garrcon Zone, south of the bulk sample pits intercepting four mineralized zones including: 1.06 g/t Au over 4.75 metres; 1.37 g/t Au over 2.4 metres; 1.32 g/t Au over 1.8 metres; and 1.65 g/t Au over 2.1 metres. All intervals show the typical mineralization style of Garrcon, sediment-hosted fracture and vein zones with associated albite, sericite, and iron carbonate alteration.

OSK-G17-448 was drilled in the southeast part of the 903 Zone targeting mineralization observed in hole OSK-G17-390 (see press release January 15, 2018). The hole intercepted two mineralized zones, the first averaging 0.93 g/t Au over 19.9 metres associated with a syenite dyke with albite-hematite alteration, quartz veining and sulfide dissemination; the second intercepted 1.0 g/t Au over 7.0 metres at the discordant contact between Temiskaming sediments and ultramafic volcanic rocks.

OSK-G17-454 intercepted three mineralized zones, the first averaging 16.1 g/t Au over 8.3 metres associated with strong sodic alteration and veining in a coarse-grained syenite porphyry. A second zone averaged 2.98 g/t Au over 3.0 metres in fuchsite altered ultramafic rocks near the contact with the previously mentioned syenite dyke. A third deeper zone averaged 1.76 g/t Au over 5.9 metres associated with the upper contact of a syenite dyke with albite-hematite alteration.

OSK-G17-458 and OSK-G17-459 were drilled in the central 903 Zone, in the same section, above and below OSK-G17-326 (see press release February 1st, 2017), respectively. OSK-G17-458 intercepted 1.03 g/t Au over 5.04 metres and 1.22 g/t Au over 7.12 metres, both associated with contacts between ultramafic rocks and albite altered syenite dykes. OSK-G17-459 intercepted 1.21 g/t Au over 16.2 metres in altered syenite near the contact with ultramafic rocks; 5.32 g/t Au over 12.6 metres in a strong carbonate alteration zone within a syenite dyke with dissemination of coarse pyrite; and 5.92 g/t Au over 2.3 metres in green sericite – pyrite alteration hosted by Temiskaming sediments in a fracture zone near the contact with ultramafic rocks.

OSK-G17-462 was drilled in the northwestern part of the 903 Zone intercepting two mineralized intervals: the first averaging 3.26 g/t Au over 3.0 metres associated with a thin mineralized layer of sediments and 8.11 g/t Au over 2.5 metres in fuchsite altered ultramafic rocks near the contact with an albite altered lamprophyre dyke.

Qualified Person
The scientific and technical content of this press release has been reviewed, prepared and approved by Mr. Gernot Wober, P.Geo. VP Exploration Canada for Osisko Mining Inc, who is a “Qualified Person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”).

Quality Control
True widths of the new exploration intercepts reported in this press release have yet to be determined, but are  typically 65 – 90% of reported core lengths. 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 2 metres using a lower cutoff of 1.0 g/t Au. All HQ core assays reported were obtained by either whole sample rock metallic screen/fire assay or standard 30 gram fire-assaying with ICP finish at SGS Minerals Services in Cochrane, Ontario; and Bureau Veritas in Timmins, Ontario. The whole sample 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 3g/t. Drill program design, Quality Assurance/Quality Control and interpretation of results is 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% of sample pulps are sent to secondary laboratories for check assays.

About the Garrison Project
The Garrison Project area is comprised of 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. (entitled “Technical Report on the Golden Bear Project – Garrison Property: Larder Lake Mining Division, Garrison Township, Ontario, Canada”) dated December 30, 2013, with an effective date of December 30, 2013 (the “Garrison Technical Report”). The Garrison Technical Report was prepared by A.C.A. Howe International Limited for Northern Gold Mining Inc. (a wholly-owned subsidiary of Osisko) and is available on Osiskos website at www.osiskomining.com and on SEDAR under Northern Gold Mining Inc.s issuer profile at www.sedar.com.

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

At the Jonpol Zone, resources were estimated as 0.87 million tonnes averaging 5.34 g/t Au (150,000 oz) in the indicated category; and 1.07 million tonnes averaging 5.56 g/t Au (192,000 oz) in inferred resources. Resources were reported at a cut-off grade of 3.0 g/t Au and assume an underground extraction scenario using a gold price of US$1,250/oz.

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 cross cuts, mining underground veins. Diamond drilling by Cominco and Lac Minerals Ltd. in the mid-to-late 1980s identified broad sections of low grade mineralization. In 2006-2007, ValGold Resources Ltd. conducted additional drilling confirming these zones. From 2009-2013 Northern Gold Mining Inc. conducted 97,000 metres of diamond drilling which delineated the current resource.

In 2014, Northern Gold Mining Inc. was granted a trial mining permit allowing the extraction of up to 150,000 tonnes. Northern Gold Mining Inc. mined 73,534 dry tonnes which was processed at the nearby Holt mill facility recovering 3,516 oz at an average head grade of 1.55 g/t and recovery of 95.9%.

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 kilometers. 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 Limited with an average grade of 6.7 g/t which produced 9,476 ounces Au. From 1985-2013, 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 metres 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.

903 Zone
This third mineralized zone present at Garrison was not included in the resource estimate reported by the previous operator in 2013. Mineralization at the 903 was discovered in 1945 by Wright-Hargreaves Mines Ltd. In 1988 Lac Minerals acquired the claims covering the current 903 Zone and completed 17 drill holes totaling 4,823 metres. The property was optioned in 1990 to Jonpol and T&H Resources and subsequently returned to Lac Minerals in 1991. Northern Gold acquired the claims from a subsidiary of Barrick Gold in 2013, conducting surface exploration and six drill holes.

About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-dOr and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area, a 100% interest in the Marban project located in the heart of Québecs prolific Abitibi gold mining district, and properties in the Larder Lake Mining Division in northeast Ontario, including the Garrcon, Jonpol and 903 zones on the Garrison property. Osisko continues to be well financed and has approximately $190 million in cash and equity investment.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the ongoing drill program at the Garrison gold project; results of the current drill program; the significance of new drill results reported in this press release; the ability of new drill results to demonstrate potential for expansion of the previously defined Garrcon, Jonpol and 903 mineralized zones at the Garrison project; the scope of the 2017 drill program; that the 2017 drill program will follow new extensions of these mineralized zones to further define the scale of mineralization at the Garrison project; potential mineralization; the ability to realize upon any mineralization in a manner that is economic; the ability to complete any proposed exploration activities and the results of such activities; the continuity or extension of any mineralization; and any other information herein that is not a historical fact may be “forward-looking information”. Any statement that involves discussions with respect to predictions, expectations, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as “expects”, or “does not expect”, “is expected”, “interpreted”, “managements view”, “anticipates” or “does not anticipate”,  “plans”, “budget”, “scheduled”, “forecasts”, “estimates”, “believes” or “intends” or variations of such words and phrases or stating that certain actions, events or results “may” or “could”, “would”, “might” or “will” be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to identify forward-looking information. This forward-looking information is based on reasonable assumptions and estimates of management of the Corporation, at the time it was made, involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Osisko to be materially different from any future results, performance or achievements expressed or implied by such forward-looking information. Such factors include, among others, risks relating to the ability of exploration activities (including drill results) to accurately predict mineralization; errors in managements geological modelling; the ability of Osisko to complete further exploration activities, including drilling; property interests; the ability of the Corporation to obtain required approvals and complete transactions on terms announced; the results of exploration activities; risks relating to mining activities; the global economic climate; metal prices; dilution; environmental risks; and community and non-governmental actions. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions, Osisko cannot assure shareholders and prospective purchasers of securities of the Corporation that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither Osisko nor any other person assumes responsibility for the accuracy and completeness of any such forward-looking information. Osisko does not undertake, and assumes no obligation, to update or revise any such forward-looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required by law.

For further information please contact:
John Burzynski, President and Chief Executive Officer
Telephone: (416) 363-8653

Osisko Intersects 56.1 g/t Au Over 8.9 Metres At Windfall

New Bobcat Zone Returns 42.4 g/t Au over 3.3 Metres Near Surface

(Toronto, January 25, 2018)  Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec. The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall).

Significant new analytical results from 72 intercepts in 39 drill holes and 6 wedges focused on infill and expansion drilling in the Main Windfall lake deposit are presented below.

  • New “Bobcat Zone” with high-grades discovered near surface and at shallow depths
  • Continued high-grade infill and expansion from Underdog
  • New hit from Drake

Highlights from the new results include: 56.1 g/t Au over 8.9 metres in OSK-W-17-1336-W1; 218 g/t Au over 2.1 metres in OSK-W-17-1191; 160 g/t over 2.0 metres in OSK-W-17-1142-W1; 106 g/t Au over 3.0 metres in OSK-W-17-1305; 30.8 g/t over 9.9 metres in OSK-OBM-16-693; 83.5 g/t Au over 3.4 metres in OSK-W-17-780-W1; 128 g/t Au over 2.1 metres in OSK-W-17-1203; 58.8 g/t Au over 2.5 metres in OSK-W-17-1095; 72.8 g/t Au over 2.0 metres in OSK-W-17-1020; 42.4 g/t Au over 3.3 metres in OSK-W-17-1138;  52.8 g/t Au over 2.3 metres in OSK-W-17-1381; 26.2 g/t Au over 3.8 metres in OSK-W-17-1374;  41.9 g/t Au over 2.0 metres in OSK-W-17-1289; 14.1 g/t Au over 5.6 metres in OSK-W-17-1255; and 26.5 g/t Au over 2.1 metres in OSK-W-17-1142. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Hole Number From (m) To (m) Interval (m) Au (g/t) uncut Au (g/t)
cut to
100 g/t
Zone Corridor
OSK-OBM-16-630 518.2 521.0 2.8 4.82   FW3U HW Underdog
OSK-OBM-16-693 654.1 664.0 9.9 30.8 22.2 FW3U HW Underdog
including 654.1 656.0 1.9 80.0 45.5
including 658.1 661.9 3.8 37.4 32.1
OSK-W-16-747 936.9 939.3 2.4 6.96   FW3 Underdog
including 938.1 938.6 0.5 32.5  
OSK-W-17-780-W1 1343.8 1347.2 3.4 83.5 29.4 FW3 HW Underdog
including 1346.6 1347.2 0.6 407 100
OSK-W-17-936-W1 776.0 778.0 2.0 3.65   Z27 Zone 27
including 777.2 778.0 0.8 8.07  
  785.0 787.7 2.7 4.03   Z27 Zone 27
including 787.0 787.7 0.7 7.71  
OSK-W-17-936-W2 671.1 673.3 2.2 11.1   Wolf HW Wolf
OSK-W-17-968 102.0 109.4 7.4 4.02   Z27 Zone 27
including 107.4 109.4 2.0 7.77  
  118.0 122.3 4.3 11.2 10.5 QTV Zone 27
including 122.0 122.3 0.3 109 100
OSK-W-17-989-W2 664.6 667.0 2.4 4.56   Wolf Wolf
OSK-W-17-1020 271.5 273.5 2.0 72.8   Bobcat Bobcat
including 272.0 273.5 1.5 96.9  
OSK-W-17-1095 88.2 90.7 2.5 58.8 52.9 Z27 Zone 27
including 88.6 89.7 1.1 114 100
OSK-W-17-1125 427.0 429.0 2.0 6.80   Vein Caribou
including 427.0 428.0 1.0 13.5  
  616.0 618.0 2.0 3.87   SHR Caribou
including 617.2 618.0 0.8 9.35  
OSK-W-17-1138 11.0 14.3 3.3 42.4   Bobcat Bobcat
including 13.0 14.3 1.3 98.1  
  21.0 24.0 3.0 3.28   Bobcat Bobcat
OSK-W-17-1139 148.0 150.2 2.2 4.29   Vein  
  157.5 160.1 2.6 4.53   Vein  
including 159.5 160.1 0.6 9.21  
OSK-W-17-1140 781.2 783.3 2.1 7.07   Caribou Ext. Caribou
including 783.0 783.3 0.3 48.8  
OSK-W-17-1142 13.1 15.2 2.1 26.5   CW4 Caribou
including 14.0 14.6 0.6 84.5  
OSK-W-17-1142-W1 370.0 372.0 2.0 160   Vein  Drake 
including 370.5 371.5 1.0 320  
OSK-W-17-1178 78.0 80.1 2.1 5.89   Bobcat Bobcat
including 79.5 80.1 0.6 17.5  
OSK-W-17-1191 235.4 237.5 2.1 218 34.6 Z27 FW Zone 27
including 236.8 237.5 0.7 650 100
OSK-W-17-1203 27.9 30.0 2.1 128 42.9 Z27 Zone 27
including 27.9 28.8 0.9 298 100
OSK-W-17-1218 27.0 29.0 2.0 3.99   VNCR Bobcat
  189.0 191.5 2.5 4.46   Bobcat Bobcat
OSK-W-17-1251 24.0 27.0 3.0 8.89   Bobcat Bobcat
including 24.0 25.0 1.0 21.0  
  55.0 59.0 4.0 3.86   Bobcat Bobcat
including 55.0 56.0 1.0 12.3  
  192.0 195.0 3.0 4.11   VNCR Bobcat
including 193.4 193.7 0.3 40.2  
OSK-W-17-1255 156.0 161.6 5.6 14.1   Bobcat Bobcat
including 156.6 159.5 2.9 21.1  
OSK-W-17-1273 54.9 57.0 2.1 4.05   Z27 HW Zone 27
including 54.9 55.4 0.5 14.3  
OSK-W-17-1280 369.8 372.7 2.9 3.19   Caribou Ext. Caribou
OSK-W-17-1288 749.0 751.0 2.0 4.41   Caribou Ext. Caribou
OSK-W-17-1289 343.0 345.0 2.0 41.9   QTV Mallard
including 343.0 344.0 1.0 83.5  
OSK-W-17-1305 348.0 351.0 3.0 106 50.1 Vein Caribou
including 349.5 351.0 1.5 211 100
OSK-W-17-1309 218.1 220.2 2.1 5.64   Z27 FW Zone 27
including 218.1 218.8 0.7 16.5  
OSK-W-17-1313 425.1 427.3 2.2 5.46   Z27 FW Zone 27
including 425.9 426.7 0.8 14.2  
  443.0 445.5 2.5 3.50   Z27 FW Zone 27
  19.0 22.0 3.0 3.05   Vein Caribou
OSK-W-17-1317 45.0 47.5 2.5 4.31   Z27 HW Zone 27
  170.0 172.0 2.0 4.60   Z27 Zone 27
OSK-W-17-1336-W1 1064.1 1073.0 8.9 56.1 15.1 FW2 Underdog
including 1067.0 1070.1 3.1 151 33.7
OSK-W-17-1371 604.6 607.0 2.4 3.61   Caribou Ext. Caribou
OSK-W-17-1374 312.6 315.0 2.4 4.27   Z27 HW Zone 27
  324.5 328.3 3.8 26.2   Z27 HW Zone 27
  721.0 723.7 2.7 3.09   FW3 Underdog
including 723.0 723.7 0.7 10.5  
OSK-W-17-1378 382.0 384.0 2.0 4.21   CS3 Caribou
  477.2 479.3 2.1 5.49   Wolf Wolf
OSK-W-17-1381 111.5 113.8 2.3 16.7   Bobcat Bobcat
including 112.5 112.9 0.4 94.6  
  653.0 655.3 2.3 52.8 13.2 Vein Zone 27
including 654.2 654.5 0.3 404 100
OSK-W-17-1383 29.5 34.2 4.7 13.1   Bobcat Bobcat
  83.0 87.0 4.0 4.01   Bobcat Bobcat
  94.9 97.0 2.1 5.01   Bobcat Bobcat
  102.0 104.1 2.1 5.33   Bobcat Bobcat 
including 103.1 104.1 1.0 10.5  
OSK-W-17-1385 734.7 737.2 2.5 8.40   Caribou Ext. Caribou
including 735.9 736.6 0.7 28.6  
  741.6 745.3 3.7 5.04   Caribou Ext. Caribou
including 744.3 745.3 1.0 13.0  
  820.5 824.0 3.5 6.64   Caribou Ext. Caribou
including 820.5 821.1 0.6 26.2  
OSK-W-17-1388 368.6 371.0 2.4 11.9   CS1 Caribou
  697.0 699.2 2.2 4.59   Wolf FW Wolf
OSK-W-17-1390 505.0 507.2 2.2 3.44   FW3 Underdog
OSK-W-17-1391 297.0 299.9 2.9 12.2   Bobcat Bobcat
including 299.4 299.9 0.5 65.4  
OSK-W-17-1393 157.0 159.0 2.0 3.91   Bobcat Bobcat
including 158.3 158.7 0.4 16.7  
OSK-W-17-1399 574.0 576.0 2.0 3.55   Caribou Ext. Caribou
OSK-W-17-1400 325.6 328.0 2.4 4.05   Caribou corridor Caribou
OSK-W-17-1404 141.4 144.0 2.6 4.28   Bobcat Bobcat
including 142.0 143.0 1.0 11.0  
  168.0 171.0 3.0 4.54   Bobcat Bobcat
including 170.7 171.0 0.3 13.4  
  535.0 537.0 2.0 3.96   Caribou Ext. Caribou
  539.7 543.0 3.3 4.33   Caribou Ext. Caribou
  356.8 359.5 2.7 10.4   Caribou Ext. Caribou
including 358.6 359.0 0.4 53.2  
OSK-W-17-1406 79.3 81.8 2.5 6.97   VNCR Bobcat
including 79.7 80.0 0.3 47.7  
  248.5 250.9 2.4 3.47   Bobcat Bobcat
  322.0 324.5 2.5 5.71   Bobcat Bobcat

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: HW = Hanging Wall, FW = footwall, VNCR = Crustiform Vein, TBD = To be determined, Ext = extension.
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-OBM-16-630 329 -51 699 452252 5434614 2375
OSK-OBM-16-693 331 -54 861 452443 5434600 2525
OSK-W-16-747 331 -57 1050 452449 5434488 2475
OSK-W-17-780-W1 331 -60 1533 452929 5434374 2850
OSK-W-17-936-W1 332 -56 808 452773 5434547 2775
OSK-W-17-936-W2 332 -56 819 452773 5434547 2775
OSK-W-17-968 152 -51 201 451948 5434759 2175
OSK-W-17-989-W2 335 -56 743 452660 5434497 2675
OSK-W-17-1020 337 -54 312 453217 5434928 3350
OSK-W-17-1095 147 -50 147 451959 5434734 2175
OSK-W-17-1125 331 -58 975 452563 5434568 2625
OSK-W-17-1138 327 -51 402 452888 5434989 3100
OSK-W-17-1139 333 -56 1092 452473 5434470 2500
OSK-W-17-1140 336 -55 975 453006 5434522 2975
OSK-W-17-1142 324 -45 680 452202 5434628 2325
OSK-W-17-1142-W1 324 -45 699 452202 5434628 2325
OSK-W-17-1178 330 -63 411 452917 5435014 3150
OSK-W-17-1191 315 -69 255 452067 5434617 2200
OSK-W-17-1203 333 -53 372 452275 5434867 2500
OSK-W-17-1218 327 -62 405 453004 5435009 3225
OSK-W-17-1251 326 -60 372 452889 5434989 3100
OSK-W-17-1255 130 -65 276 452947 5435107 3225
OSK-W-17-1273 338 -66 225 452081 5434634 2225
OSK-W-17-1280 335 -57 467 452857 5434931 3050
OSK-W-17-1288 331 -56 912 452945 5434561 2950
OSK-W-17-1289 339 -61 375 452277 5434866 2500
OSK-W-17-1305 330 -54 888 452499 5434592 2575
OSK-W-17-1309 330 -69 237 452073 5434610 2200
OSK-W-17-1313 331 -51 876 452279 5434573 2375
OSK-W-17-1317 327 -65 274 452072 5434611 2200
OSK-W-17-1336-W1 335 -61 1335 452616 5434449 2600
OSK-W-17-1371 334 -69 981 453100 5434875 3225
OSK-W-17-1374 317 -59 873 452273 5434579 2375
OSK-W-17-1378 331 -56 741 452688 5434638 2750
OSK-W-17-1381 329 -63 723 453018 5434935 3200
OSK-W-17-1383 331 -63 597 452767 5434864 2925
OSK-W-17-1385 319 -49 906 453379 5434741 3400
OSK-W-17-1388 332 -57 762 452716 5434605 2775
OSK-W-17-1390 329 -47 657 451911 5434437 1975
OSK-W-17-1391 327 -62 663 452981 5434900 3150
OSK-W-17-1393 332 -62 573 452725 5434862 2900
OSK-W-17-1399 332 -61 1053 453411 5434870 3500
OSK-W-17-1400 332 -52 769 452310 5434408 2325
OSK-W-17-1404 335 -67 635 452854 5434823 3000
OSK-W-17-1406 334 -60 579 452911 5434879 3075

 

OSK-OBM-16-693 intersected 30.8 g/t Au over 9.9 metres in the Underdog Corridor. Mineralization is composed of up to 10% pyrite-silica flooding, up to 5% pyrite stringers, 3% disseminated pyrite, and local visible gold. The host rhyolite, in contact with a porphyritic felsic dike, is strongly silica and sericite altered.

OSK-W-17-780-W1 intersected 83.5 g/t Au over 3.4 metres in FW3 HW. Mineralization is composed of 4% pyrite stringers and smoky quartz veins within a strongly silica altered porphyritic felsic dike.

OSK-W-17-1020 intersected 72.8 g/t Au over 2.0 meters in the new Bobcat Zone. This zone is NE along strike and on top of the Caribou corridor. The two zones have parallel plunges to the North-East. Mineralization is composed of 1% disseminated pyrite and 2% of pyrite-silica flooding within a strongly sericitized rhyolite.

OSK-W-17-1095 intersected 58.8 g/t Au over 2.5 metres in Zone 27. Mineralization is composed of up to 5% pyrite with low angle silica flooding hosted in a strongly silicified and fuchsitized andesite.

OSK-W-17-1138 intersected 42.4 g/t Au over 3.3 metres in Bobcat. Mineralization is very near surface (starting 11 metres downhole) and is composed of 3% silica flooding, 1% disseminated pyrite and crustiform vein within a sericitized rhyolite.

OSK-W-17-1139 intersected two veins in a sheared andesite south of the main zone. Mineralization, 4.29 g/t Au over 2.2 metres and 4.53 g/t au over 2.6 metres, is composed of up to 4% disseminated pyrite within a chloritized andesite.

OSK-W-17-1142-W1 intersected 160 g/t Au over 2.0 metres providing a new hit for Drake. Mineralization is composed of up to 10% pyrite, local visible gold and electrum associated in quartz-carbonate veins. The bleached andesite is near the Red Dog contact.

OSK-W-17-1191 intersected 218 g/t Au over 2.1 metres in Zone 27. Mineralization is composed of 5% pyrite stringers and 3% pyrite fragments within a strongly sericitized and silicified andesite.

OSK-W-17-1203 intersected 128 g/t Au over 2.1 metres in Zone 27. Mineralization is composed of up to 20% pyrite, pyrite silica flooding and local visible gold within a strongly silicified rhyolite.

OSK-W-17-1251 intersected 8.89 g/t Au over 3.0 metres, 3.86 g/t Au over 4.0 metres and 4.11 g/t Au over 3.0 metres in Bobcat. The first interval is composed of up to 7% pyrite-silica flooding and 1% ptygmatic tourmaline veins within a strongly sericitized and silicified felsic porphyritic dike. The second interval is within a sericitized rhyolite and composed of up to 5% pyrite stringers and disseminated pyrite. The third interval is within a quartz crustiform vein.

OSK-W-17-1255 intersected 14.1 g/t Au over 5.6 metres in Bobcat. Mineralization is composed of up to 10% pyrite within a pyrite-silica flooding running at low core angle. The hosting gabbro is strongly altered in silica and sericite.

OSK-W-17-1289 intersected 41.9 g/t Au over 2.0 meters in Mallard. Mineralization is composed of 1% disseminated pyrite in quartz-tourmaline veins within a chloritized andesite.

OSK-W-17-1305 intersected 106 g/t Au over 3.0 metres in Caribou Corridor. Mineralization is composed of disseminated pyrite within quartz-carbonate veins hosted in a sericitized andesite.

OSK-W-17-1336-W1 intersected 56.1 g/t Au over 8.9 metres in Underdog Corridor. Mineralization is composed of local visible gold with up to 8% pyrite stringers, disseminated chalcopyrite and quartz-tourmaline veins within a silicified porphyritic felsic dike.

OSK-W-17-1381 intersected 16.7 g/t Au over 2.3 metres in Bobcat and 52.8 g/t Au over 2.3 metres in Zone 27. The first interval is composed of 2% pyrite stringers, 3% pyrite fragments and a 10 centimetres quartz-carbonate vein within a sericitized and silicified rhyolite. The second interval, is composed of 4% disseminated pyrite and local visible gold within a quartz-cabonate vein hosted in a chloritized andesite.

OSK-W-17-1383 intersected four intervals in Bobcat: 13.1 g/t Au over 4.7 metres, 4.01 g/t Au over 4.0 metres, 5.01 g/t Au over 2.1 metres and 5.33 g/t Au over 2.1 metres. Mineralization is composed of up to 5% pyrite stringers, 1% pyrite tourmaline stringers and up to 1% disseminated pyrite. The first interval is in a porphyritic felsic dike and the three others are in crustiform veins within a silicified rhyolite.

Zone 27 results also include 12 intercepts from 7 drill holes and one wedge. Mineralization is composed of up to 15% pyrite, disseminated or in stringers associated with quartz-tourmaline veins. Host rocks are rhyolites, andesites and felsic dikes.

Caribou results also include 18 intercepts from 12 drill holes. Mineralization is composed of up to 20% pyrite, usually in stringers, locally semi-massive, and quartz-tourmaline veins hosted in altered porphyritic felsic dikes, andesites and rhyolites.

Wolf results include 4 intercepts from 2 drill holes and 2 wedges. Mineralization is composed of up to 70% pyrite-silica flooding, up to 20% pyrite stringers, and ptygmatic tourmaline veins hosted in silicified, sericitized and fuchsitized andesite.

Underdog results also include 4 intercepts from 4 drill holes. Mineralization is composed of up to 20% pyrite, usually in stringers associated with trace quartz-tourmaline veins and hosted in porphyritic felsic dikes. Host dikes are strongly silica altered.

Bobcat results also include 11 intercepts from 7 drill holes. Mineralization is composed of up to 10% pyrite-silica flooding, up to 5% disseminated pyrite and crustiform quartz veins within chloritized, sericitized andesites, rhyolites and felsic dikes.

Qualified Person
The scientific and technical content of this news release has been reviewed, prepared and approved by Mr. Louis Grenier, M.Sc.A., P.Geo. (OGQ 800), Project Manager of the Windfall Lake gold project, who is a “Qualified Person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”).

Quality Control and Reporting Protocols
True widths determinations are estimated at 65-80% of the reported core length intervals for most of the zones. Assays are uncut except where indicated. Intercepts occur within geological confines of major zones but have not been correlated to individual vein domains at this time. Reported intervals include minimum weighted averages of 3.0 g/t Au diluted over core lengths of at least 2.0 metres. All NQ core assays reported were obtained by either 1-kilogram screen fire assay or standard 50-gram fire-assaying-AA finish or gravimetric finish at ALS Laboratories in Val dOr, Québec, Thunder Bay and Sudbury, Ontario or Vancouver, British Colombia or Bureau Veritas in Timmins, Ontario. The 1-kilogram screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. Selected samples are also analyzed for multi-elements, including silver, using an Aqua Regia-ICP-AES method at ALS Laboratories. Drill program design, Quality Assurance/Quality Control (“QA/QC”) and interpretation of results is performed by qualified persons employing a QA/QC program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the Corporation as well as the lab. Approximately 5% of sample pulps are sent to secondary laboratories for check assay.

About the Windfall Lake Gold Deposit
The Windfall Lake gold deposit is located between Val-dOr and Chibougamau in the Abitibi region of Québec, Canada. The mineral resource defined by the previous operator comprises 2,762,000 tonnes at 8.42 g/t Au (748.000 ounces) in the indicated category and 3,512,000 tonnes at 7.62 g/t Au (860,000 ounces) in the inferred category (sourced from a technical report dated June 10, 2015 entitled “Preliminary Economic Assessment of the Windfall Lake Gold Property, Québec, Canada” with an effective date of April 28, 2015, prepared in accordance with NI 43-101). The Windfall Lake gold deposit is currently one of the highest grade resource-stage gold projects in Canada. The bulk of the mineralization occurs in the Main Zone, a southwest/northeast trending zone of stacked mineralized lenses, measuring approximately 600 metres wide and at least 1.400 metres long. The deposit is well defined from surface to a depth of 500 metres, and remains open along strike and at depth. Mineralization has been identified only 30 metres from surface in some areas and as deep as 870 metres in others, with significant potential to extend mineralization up and down-plunge and at depth.

About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-dOr and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100% interest in the Marban project located in the heart of Québecs 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. The Corporation also holds interests and options in a number of additional properties in northern Quebec and Ontario.  Osisko continues to be well financed with approximately $190 million in cash and investments.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news rele

Osisko Intersects 415 g/t Au Over 5.9 Metres At Lynx

High-Grade Core Developing at Lynx 4

(Toronto, January 23, 2018)  Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec. The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall).

Significant new analytical results from 23 intercepts in 17 drill holes focused on infill and expansion drilling in the Lynx deposit are presented below. Osisko continues to extend the known Lynx zones of mineralization through the application of the Windfall geological model and as the density of drilling increases.  The new results appear to demonstrate that the Lynx 4 Zone is developing a high-grade core similar to the Lynx 1 discovery zone.

  • New infill drillholes are delineating a high-grade zone in Lynx 4 between sections 3925E and 4225E
  • Lynx 4 demonstrates good continuity along 1350 metres strike between sections 2875E and 4225E.
  • New drilling shows the potential extension of Lynx 6 by 725 metres to the south-west.

Highlights from the new results include: 415 g/t Au over 5.9 metres and 19.9 g/t Au over 8.8 metres in OSK-W-17-1166-W1; 43.7 g/t Au over 4.8 metres in OSK-W-17-1128; 25.1 g/t Au over 4.5 metres in OSK-W-17-1386; 46.3 g/t Au over 2.4 metres in OSK-W-17-909-W4; 26.1 g/t Au over 4.2 metres in OSK-17-W-1156; 42.1 g/t Au over 2.0 metres in OSK-W-17-931;  17.4 g/t Au over 4.8 metres in OSK-W-17-1166-W4;  11.8 g/t Au over 5.5 metres in OSK-W-17-958; and 23.4 g/t Au over 2.0 metres in OSK-W-17-1397. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Hole Number From
(m)
To
(m)
Interval
(m)
Au (g/t)
uncut
Au (g/t)
cut to
100 g/t
Zone Corridor
OSK-W-17-909-W4 950.0 952.5 2.5 8.96   Lynx 4 Lynx
including 950.5 951.0 0.5 37.2  
  1049.6 1052.0 2.4 46.3   Lynx 4 Lynx
OSK-W-17-931 683.0 685.0 2.0 42.1 22.4 Lynx 4 Lynx
including 683.0 683.4 0.4 199 100
OSK-W-17-958 1053.0 1058.5 5.5 11.8   Lynx 4 Lynx
including 1054.0 1054.3 0.3 68.7  
including 1057.9 1058.5 0.6 53.5  
OSK-W-17-1054 86.0 88.0 2.0 12.9   Lynx 1 Lynx
including 86.4 87.0 0.6 42.6  
OSK-W-17-1117 86.9 89.0 2.1 4.76   Lynx 2 Lynx
including 86.9 87.5 0.6 16  
OSK-W-17-1128 466.2 471.0 4.8 43.7 22.7 Lynx 2 Lynx
including 470.2 471.0 0.8 226 100
OSK-W-17-1156 520.8 525.0 4.2 26.1 25.0 Lynx HW Lynx
including 521.1 522.2 1.1 92.2 88.2
OSK-W-17-1166-W1 997.7 1006.5 8.8 19.9 12.5 Lynx 4 Lynx
including 1005.4 1005.7 0.3 317 100
  1012.0 1014.1 2.1 15.0   Lynx 4 Lynx
including 1013.5 1014.1 0.6 49.6  
  1027.0 1032.9 5.9 415 69.6 Lynx 4 Lynx
Including 1027.0 1027.8 0.8 68.8  
Including 1028.4 1029.3 0.9 1870 100
Including 1029.3 1030.3 1.0 126 100
Including 1031.3 1032.0 0.7 271 100
Including 1032.0 1032.9 0.9 431 100
OSK-W-17-1166-W4 1079.7 1084.5 4.8 17.4   Lynx 4 Lynx
including 1081.0 1081.5 0.5 58.4  
including 1084.0 1084.5 0.5 52.0  
OSK-W-17-1190 998.0 1000.0 2.0 13.6   Lynx 6 Lynx
OSK-W-17-1199 172.1 174.1 2.0 3.68   Lynx 3 Lynx
OSK-W-17-1242-W1 607.0 609.0 2.0 9.36   Lynx HW Lynx
including 608.2 609.0 0.8 21.9  
OSK-W-17-1265 415.8 418.5 2.7 3.19   Lynx 4 Lynx
OSK-W-17-1343-W2 864.8 867.0 2.2 5.79   Lynx 4 Lynx
  879.0 881.0 2.0 14.2   Lynx 4 Lynx
including 879.4 879.7 0.3 69.6  
  1197.9 1200.0 2.1 7.84   Lynx 6 Lynx
including 1197.9 1198.2 0.3 54.3  
OSK-W-17-1386 747.5 750.0 2.5 18.1   Lynx 1 Lynx
including 747.5 748.4 0.9 49.3  
  771.3 775.8 4.5 25.1 15.1 Lynx 1 Lynx
including 771.3 772.3 1.0 104 58.8
OSK-W-17-1397 213.0 215.0 2.0 23.4 21.6 Lynx 2 Lynx
including 214.1 214.4 0.3 112 100
OSK-W-17-1399 353.8 359.0 5.2 6.11   VNCR Lynx
including 353.8 354.4 0.6 17.0  
including 358.0 359.0 1.0 20.2  

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: HW = Hanging Wall, VNCR = Crustiform Vein.
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-W-17-909-W4 131 -55 1134 453683 5435677 4125
OSK-W-17-931 134 -50 936 453360 5435437 3725
OSK-W-17-958 143 -55 1212 453359 5435439 3725
OSK-W-17-1054 325 -48 363 453282 5435000 3450
OSK-W-17-1117 334 -46 471 453120 5434934 3275
OSK-W-17-1128 129 -53 1419 453272 5435392 3625
OSK-W-17-1156 136 -49 663 453437 5435484 3825
OSK-W-17-1166-W1 132 -59 1516 453621 5435639 4050
OSK-W-17-1166-W4 132 -59 1236 453621 5435639 4050
OSK-W-17-1190 151 -49 1179 452905 5435152 3200
OSK-W-17-1199 333 -53 672 453416 5435073 3600
OSK-W-17-1242-W1 144 -58 1008 453570 5435490 3950
OSK-W-17-1265 334 -53 1074 453083 5434542 3050
OSK-W-17-1343-W2 137 -56 1323 453570 5435490 3950
OSK-W-17-1386 136 -54 998 453800 5435749 4275
OSK-W-17-1397 333 -61 732 453300 5434964 3450
OSK-W-17-1399 332 -61 1053 453411 5434870 3500

OSK-W-17-909-W4 intersected two intervals in Lynx 4: 8.96 g/t Au over 2.5 metres and 46.3 g/t Au over 2.4 metres. The first interval is composed of up to 10% irregular pyrite stringers at a sericitized contact between a gabbro and a rhyolite. The second interval is composed of 3% interstitial pyrite in silica flooding within strongly sericitized andesite.

OSK-W-17-931 intersected 42.1 g/t Au over 2.0 metres in Lynx 4. Mineralization is composed of 5% disseminated pyrite, 2% pyrite-tourmaline stringers and trace of pyrite-silica flooding within a strongly sericitized rhyolite.

OSK-W-17-958 intersected 11.8 g/t Au over 5.5 metres in Lynx 4. Mineralization is composed of 5% disseminated pyrite, and 2% pyrite-sphalerite stringers. Two low angle smoky quartz veins have local visible gold. The host rhyolite is strongly silicified and sericitized.

OSK-W-17-1054 intersected 12.9 g/t Au over 2.0 metres in Lynx 1. Mineralization is composed of 1% pyrite stringers within a chloritized shear zone.

OSK-W-17-1117 intersected 4.76 g/t Au over 2.1 metres in Lynx 2. Mineralization is composed of 8% pyrite-silica flooding and 1% pyrite stringers within a strongly silicified fragmental felsic dike.

OSK-W-17-1028 intersected 43.7 g/t Au over 4.8 metres in Lynx 2. Mineralization is composed of 2% pyrite stringers and local visible gold at the contact between a rhyolite and a gabbro. Silica, sericite and fuchsite alteration is pervasive in the rhyolite.

OSK-W-17-1156 intersected Lynx HW returning 26.1 g/t Au over 4.2 metres. Mineralization is composed of 5% pyrite stringers and 2% disseminated pyrite. Local visible gold, electrum and chalcopyrite are disseminated at the strongly silicified and fuchsitized contact between the gabbro and felsic intrusion.

OSK-W-17-1166-W1 intersected three intervals in Lynx 4: 19.9 g/t Au over 8.8 metres, 15.0 g/t Au over 2.1 metres and 415 g/t Au over 5.9 metres. The first interval is composed of 2% pyrite stringers and 1% ptygmatic tourmaline veins within a strongly silicified porphyritic felsic dike. Local visible gold is associated with pyrite-silica flooding. The second interval is composed of up to 4% pyrite silica flooding and 1% pyrite clusters within a strongly silicified, carbonatized and fuchsitized porphyric felsic dike. The last interval includes four high grade sub-intervals with up to 25% disseminated pyrite, up to 7% pyrite stringers and pyrite-tourmaline stringers. The mineralization is hosted in a strongly silicified rhyolite.

OSK-W-17-1166-W4 intersected 17.4 g/t Au over 4.8 metres in Lynx 4. Mineralization is composed of up to 7% disseminated pyrite. Local visible gold is within a low angle smoky quartz vein hosted in a strongly sericitized and silicified rhyolite. This interval extends Lynx 4 by 85 metres vertically under OSK-W-17-1166-W1 (this press release).

OSK-W-17-1190 intersected 13.6 g/t Au over 2.0 metres in Lynx 6. Mineralization is composed of 2% pyrite clusters and 1% pyrite stringers within a chloritized andesite. The interval is 725 metres up plunge and south-west of OSK-W-17-1343-W3 (this press release).

OSK-W-17-1199 intersected 3.68 g/t Au over 2.0 metres. Mineralization is composed of pyrite-silica flooding and quartz veins within a chloritized fragmental felsic dike.

OSK-W-17-1242-W1 intersected 9.36 g/t Au over 2.0 metres in Lynx HW. Mineralization is composed of 1% disseminated and clustered pyrite at the contact between a gabbro and a porphyritic felsic dike.

OSK-W-17-1265 intersected 3.19 g/t Au over 2.7 metres in Lynx 4. Mineralization is at the contact between a rhyolite and a felsic dike and composed of 1% pyrite stringers with strong sericite alteration.

OSK-W-17-1343-W2 intersected three intervals: 5.79 g/t Au over 2.2 metres and 14.2 g/t Au over 2.0 metres in Lynx 4 and 7.84 g/t Au over 2.1 metres in Lynx 6. The first interval is composed of up to 10% pyrite clusters and silica-carbonates-tourmaline veins within a moderately silicified and sericitized rhyolite. The second interval is composed of 10% pyrite-silica flooding within a strongly sericitized rhyolite. The last interval is composed of local visible gold, 3% disseminated pyrite and 2% pyrite clusters within a chloritized and silicified rhyolite. This interval extends Lynx 6 by 50 meters vertically under OSK-W-17-1128 (14.0 g/t Au over 2.3 metres previously reported October 12, 2017).

OSK-W-17-1386 intersected two intervals in Lynx 1: 18.1 g/t Au over 2.5 metres and 25.1 g/t Au over 4.5 metres. The first interval is composed of up to 3% pyrite clusters, 1% quartz-tourmaline veins and 1% disseminated pyrite. Mineralization is hosted in a sericitized and fuchsitized gabbro. The second interval is at the contact between a gabbro and a felsic dike. Mineralization is composed of 3% pyrite clusters, 3% pyrite-silica flooding and 1% pyrite stockwork.

OSK-W-17-1397 intersected Lynx 2 returning 23.4 g/t Au over 2.0 metres. Mineralization is composed of up to 10% pyrite-silica flooding, 2% disseminated pyrite and local visible gold within a fuchsite and sericite altered rhyolite.

OSK-W-17-1399 intersected 6.11 g/t Au over 5.2 metres in Lynx 1. Mineralization is composed of up to 10% pyrite stringers and 5% pyrite clusters associated with 30% quartz crustiform veins injected in a weak fuchsite altered gabbro.

Qualified Person
The scientific and technical content of this news release has been reviewed, prepared and approved by Mr. Louis Grenier, M.Sc.A., P.Geo. (OGQ 800), Project Manager of the Windfall Lake gold project, who is a “Qualified Person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”).

Quality Control and Reporting Protocols
True widths determinations are estimated at 65-80% of the reported core length intervals for most of the zones. Assays are uncut except where indicated. Intercepts occur within geological confines of major zones but have not been correlated to individual vein domains at this time. Reported intervals include minimum weighted averages of 3.0 g/t Au diluted over core lengths of at least 2.0 metres. All NQ core assays reported were obtained by either 1-kilogram screen fire assay or standard 50-gram fire-assaying-AA finish or gravimetric finish at ALS Laboratories in Val dOr, Québec, Thunder Bay and Sudbury, Ontario or Vancouver, British Colombia or Bureau Veritas in Timmins, Ontario. The 1-kilogram screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. Selected samples are also analyzed for multi-elements, including silver, using an Aqua Regia-ICP-AES method at ALS Laboratories. Drill program design, Quality Assurance/Quality Control (“QA/QC”) and interpretation of results is performed by qualified persons employing a QA/QC program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the Corporation as well as the lab. Approximately 5% of sample pulps are sent to secondary laboratories for check assay.

About the Windfall Lake Gold Deposit
The Windfall Lake gold deposit is located between Val-dOr and Chibougamau in the Abitibi region of Québec, Canada. The mineral resource defined by the previous operator comprises 2,762,000 tonnes at 8.42 g/t Au (748.000 ounces) in the indicated category and 3,512,000 tonnes at 7.62 g/t Au (860,000 ounces) in the inferred category (sourced from a technical report dated June 10, 2015 entitled “Preliminary Economic Assessment of the Windfall Lake Gold Property, Québec, Canada” with an effective date of April 28, 2015, prepared in accordance with NI 43-101). The Windfall Lake gold deposit is currently one of the highest grade resource-stage gold projects in Canada. The bulk of the mineralization occurs in the Main Zone, a southwest/northeast trending zone of stacked mineralized lenses, measuring approximately 600 metres wide and at least 1.400 metres long. The deposit is well defined from surface to a depth of 500 metres, and remains open along strike and at depth. Mineralization has been identified only 30 metres from surface in some areas and as deep as 870 metres in others, with significant potential to extend mineralization up and down-plunge and at depth.

About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-dOr and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100% interest in the Marban project located in the heart of Québecs 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. The Corporation also holds interests and options in a number of additional properties in northern Quebec and Ontario.  Osisko continues to be well financed with approximately $190 million in cash and investments.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the Windfall Lake gold deposit being one of the highest grade resource-stage gold projects in Canada; the current 800,000 metre drill program; the significance of new results from the ongoing drill program at the Windfall Lake gold project; the significance of assay results presented in this press release; the high-grade core developing at Lynx 4; the type of drilling included in the drill program (definition drilling, expansion drilling to the NE of the main deposit and adjacent Lynx deposit, and exploration drilling on the greater deposit and Urban-Barry project area); potential mineralization; the potential to extend mineralization up and down-plunge and at depth at the Windfall Lake gold deposit; the ability to realize upon any mineralization in a manner that is economic; the ability to complete any proposed exploration activities and the results of such activities, including the continuity or extension of any mineralization; and any other information herein that is not a historical fact may be “forward-looking information”. Any statement that involves discussions with respect to predictions, expectations, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as “expects”, or “does not expect”, “is expected”, “interpreted”, “managements view”, “anticipates” or “does not anticipate”, “plans”, “budget”, “scheduled”, “forecasts”, “estimates”, “believes” or “intends” or variations of such words and phrases or stating that certain actions, events or results “may” or “could”, “would”, “might” or “will” be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to identify forward-looking information. This forward-looking information is based on reasonable assumptions and estimates of management of the Corporation. at the time it was made, involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Osisko to be materially different from any future results, performance or achievements expressed or implied by such forward-looking information. Such factors include, among others, risks relating to the ability of exploration activities (including drill results) to accurately predict mineralization; errors in managements geological modelling; the ability of Osisko to complete further exploration activities, including drilling; property interests in the Windfall Lake gold project; the ability of the Corporation to obtain required approvals and complete transactions on terms announced; the results of exploration activities; risks relating to mining activities; the global economic climate; metal prices; dilution; environmental risks; and community and non-governmental actions. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions. Osisko cannot assure shareholders and prospective purchasers of securities of the Corporation that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither Osisko nor any other person assumes responsibility for the accuracy and completeness of any such forward-looking information, Osisko does not undertake, and assumes no obligation, to update or revise any such forward-looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required by law.

For further information please contact:
John Burzynski. President and Chief Executive Officer
Telephone: (416) 363-8653

Osisko Intersects 86.7 g/t Au Over 4.3 Metres At Windfall

Mineralization Continues to be Confirmed in Caribou Extension

(Toronto, January 18, 2018)  Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec. The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall).

Significant new analytical results from 148 intercepts in 84 drill holes and 5 wedges focused on infill and expansion drilling in the Main Windfall lake deposit are presented below.

  • New Underdog Zone discovered to SW
  • New mineralization discovered between the Mallard Zone and Zone 27.
  • New mineralization discovered near surface west of the main deposit.

Highlights from the new results include: 86.7 g/t Au over 4.3 metres in OSK-W-17-1345; 74.0 g/t Au over 2.5 metres and 29.6 g/t Au over 2.9 metres in OSK-W-17-1334; 48.6 g/t over 2.0 metres in OSK-OBM-15-565; 32.7 g/t Au over 2.8 metres in OSK-W-17-1233; 41.5 g/t Au over 2.0 metres and 24.8 g/t Au over 2.4 metres in OSK-OBM-16-678; 10.0 g/t Au over 8.1 metres in OSK-W-17-1317; 11.1 g/t Au over 6.9 metres in OSK-W-17-1125-W1; 29.2 g/t Au over 2.2 metres in OSK-W-17-1273; 11.6 g/t Au over 5.4 metres in OSK-W-17-1308; 25.2 g/t Au over 2.0 metres in OSK-W-17-1313;  and 20.5 g/t Au over 2.3 metres in OSK-W-17-1225. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Osisko Intersects 76.5 g/t Au Over 5.0 Metres At Windfall

New Underdog Zone Discovered SW of Main Deposit

(Toronto, January 16, 2018) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec. The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall).

Significant new analytical results from 57 intercepts in 32 drill holes focused on infill and expansion drilling in the Underdog area of the Main Windfall Lake deposit are presented below.

  • Drilling continues to infill zones of mineralization in Underdog through the application of the Windfall geological model
  • New mineralization has been discovered 140 metres to the southwest of previously defined Underdog zones

Highlights from the new results include: 76.5 g/t Au over 5.0 metres in OSK-W-17-1275; 29.1 g/t Au over 3.6 metres, 59.5 g/t Au over 2.1 metres, and 9.65 g/t Au over 10.4 metres in OSK-EAG-13-480; 11.9 g/t Au over 9.0 metres in OSK-W-17-1125; 24.4 g/t Au over 4.0 metres in OSK-W-17-1336;  42.9 g/t Au over 4.1 metres in OSK-W-17-13361W1; 38.7 g/t Au over 2.0 metres in OSK-W-17-1259;  22.3 g/t Au over 2.2 metres in OSK-W-17-1249;  20.4 over 2.0 metres in OSK-W-17-1239;  and 13.3 g/t Au over 3.6 metres in OSK-OBM-16-693. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Hole Number From (m) To (m) Interval (m) Au (g/t) uncut Au (g/t)
cut to
100 g/t
Zone Corridor
OSK-OBM-15-565 393.0 395.0 2.0 48.6   TBD Zone 27 –  Mallard
including 394.0 395.0 1.0 96.9  
OSK-OBM-16-678 256.0 258.4 2.4 24.8   Z27 Zone 27
including 257.5 258.4 0.9 65.4  
  318.0 320.0 2.0 41.5   Z27 Zone 27
including 319.0 320.0 1.0 82.8  
OSK-W-17-937-W1 786.4 788.6 2.2 3.21   Wolf 2 Caribou
OSK-W-17-937-W2 749.0 751.5 2.5 16.8   Wolf 2 HW Caribou
  811.0 813.0 2.0 9.01   Wolf 2 Caribou
including 811.3 811.8 0.5 25.2  
OSK-W-17-978 492.2 495.0 2.8 3.04   Caribou Ext. Caribou
OSK-W-17-989-W2 506.0 509.0 3.0 6.29   CS1 Caribou
including 506.0 507.0 1.0 16.0  
OSK-W-17-1002 284.0 286.0 2.0 5.07   Z27 Zone 27
including 284.6 285.0 0.4 16.5  
OSK-W-17-1014 176.6 180.0 3.4 6.27   Z27 Zone 27
including 178.4 179.0 0.6 30.0  
OSK-W-17-1051 51.0 53.4 2.4 3.94   VNCR F17
OSK-W-17-1052 721.0 723.3 2.3 3.81   Z27 Zone 27
including 721.8 722.1 0.3 21.9  
OSK-W-17-1053 74.7 79.8 5.1 5.06   Z27 Zone 27
including 79.2 79.8 0.6 38.2  
OSK-W-17-1073 97.2 101.4 4.2 3.11   VNCR  
OSK-W-17-1077 59.0 61.0 2.0 8.41   Z27 Zone 27
including 59.4 60.0 0.6 18.0  
OSK-W-17-1125-W1 368.0 370.1 2.1 4.01   CS3 Caribou
  445.0 447.0 2.0 7.57   Caribou FW Caribou
including 445.0 446.0 1.0 15.1  
  475.0 481.9 6.9 11.1   Wolf HW Caribou
including 479.0 481.0 2.0 26.5  
OSK-W-17-1125-W3 420.0 422.0 2.0 18.1   Caribou Caribou
including 421.0 422.0 1.0 36.1  
  501.0 503.0 2.0 10.2   Wolf Caribou
including 502.0 503.0 1.0 19.6  
OSK-W-17-1134 366.8 369.10 2.3 16.0   VNCR Mallard
including 366.8 367.5 0.7 50.6  
OSK-W-17-1135 115.0 117.4 2.4 3.33   Z27 Zone 27
OSK-W-17-1139 77.0 79.0 2.0 4.06   Shear Caribou
OSK-W-17-1140 326.0 328.4 2.4 3.94   Vein Caribou
including 328.1 328.4 0.3 29.7  
OSK-W-17-1141 87.0 91.1 4.1 4.00   Z27 Zone 27
OSK-W-17-1145 64.3 67.5 3.2 4.01   Z27 FW Zone 27
including 66.5 67.5 1.0 10.2  
OSK-W-17-1159 538.0 540.0 2.0 4.99   Caribou Ext. Caribou
OSK-W-17-1163 356.0 358.0 2.0 9.60   No Name TBD 
including 356.0 357.0 1.0 19.1  
OSK-W-17-1164 120.7 123.0 2.3 3.37   Z27 Zone 27
OSK-W-17-1184 50.0 52.0 2.0 4.21   Z27 HW Zone 27
including 50.5 51.0 0.5 16.8  
  164.9 167.5 2.6 4.64   Z27 Zone 27
including 166.6 167.5 0.9 13.0  
OSK-W-17-1186 407.5 410.5 3.0 12.3   CN2 Caribou
including 407.5 409.0 1.5 24.4  
  502.0 504.5 2.5 3.49   Z27 HW Zone 27
including 502.0 503.0 1.0 8.61  
OSK-W-17-1188 99.2 101.8 2.6 16.8   Z27 Zone 27
including 100.2 100.8 0.6 67.9  
OSK-W-17-1191 194.2 197.0 2.8 13.9   Z27 Zone 27
including 194.2 194.8 0.6 63.4  
  200.5 202.6 2.1 7.46   Z27 Zone 27
including 201.5 202.6 1.1 13.9  
OSK-W-17-1194 325.5 331.4 5.9 3.12   New Zone North of Mallard
including 325.5 326.1 0.6 23.8  
OSK-W-17-1196 185.0 187.0 2.0 15.7   Z27 FW Zone 27
including 186.6 187.0 0.4 72.5  
OSK-W-17-1198 186.9 194.4 7.5 3.47   Z27 Zone 27
including 186.9 188.1 1.2 12.6  
OSK-W-17-1200 245.1 248.0 2.9 3.00   New Zone Caribou
including 247.1 248.0 0.9 8.74  
OSK-W-17-1202 554.8 557.0 2.2 8.71   Caribou Ext. Caribou
including 554.8 555.6 0.8 23.2  
OSK-W-17-1203 269.0 272.0 3.0 6.76   Mallard Mallard
including 270.2 270.7 0.5 31.7  
OSK-W-17-1207 8.0 10.3 2.3 5.94   Drake Mallard
including 8.0 8.8 0.8 14.3  
  182.6 184.9 2.3 3.35   Mallard Mallard
OSK-W-17-1215 105.0 107.0 2.0 4.11   New Zone Underdog
OSK-W-17-1217 14.9 17.1 2.2 5.47   New Zone TBD 
including 15.6 16.4 0.8 14.4  
OSK-W-17-1225 9.0 12.3 3.3 5.77   New Zone TBD 
  201.3 203.6 2.3 9.58   Mallard HW Mallard
including 201.3 202.0 0.7 30.3  
  245.2 247.5 2.3 20.5   Mallard Mallard
including 245.2 246.4 1.2 39.1  
OSK-W-17-1227 926.0 929.4 3.4 6.56   Wolf Ext. Caribou
including 926.0 927.0 1.0 15.8  
  962.0 964.0 2.0 10.5   Wolf Ext. Caribou
  969.0 971.0 2.0 4.93   Wolf Ext. Caribou
OSK-W-17-1233 39.9 42.7 2.8 32.7   No Name  
including 40.5 41.6 1.1 81.3  
OSK-W-17-1239 226.0 228.0 2.0 4.11   Caribou Caribou
  255.2 258.0 2.8 10.4   Caribou Caribou
OSK-W-17-1247 326.0 329.0 3.0 3.00   New Zone Underdog
OSK-W-17-1256 315.0 317.2 2.2 3.11   Mallard Mallard
OSK-W-17-1264 71.1 74.5 3.4 6.33   Z27 HW Zone 27
including 71.4 71.9 0.5 41.4  
  166.5 169.0 2.5 6.88   Z27 Zone 27
including 167.4 167.7 0.3 54.0  
OSK-W-17-1265 738.7 741.0 2.3 5.34   Caribou Ext. Caribou
  940.8 942.8 2.0 13.0   Z27 Zone 27
including 941.2 942.2 1.0 25.7  
OSK-W-17-1267 101.6 104.0 2.4 3.04   Caribou Caribou
OSK-W-17-1268 83.0 85.0 2.0 5.51   New Zone Mallard
  161.0 163.0 2.0 9.39   Drake Mallard
  183.0 186.0 3.0 8.17   Z27 FW Zone 27
including 183.0 183.9 0.9 23.8  
  266.3 268.4 2.1 4.84   Z27 Zone 27
including 266.3 266.8 0.5 15.0  
OSK-W-17-1269 69.5 72.0 2.5 3.10   Z27 HW Zone 27
  117.5 122.0 4.5 3.69   Z27 HW Zone 27
including 117.5 118.0 0.5 8.01  
  134.5 137.5 3.0 3.09   Z27 Zone 27
  146.0 148.4 2.4 3.47   Z27 Zone 27
  175.3 178.0 2.7 3.33   Z27 Zone 27
including 176.0 177.0 1.0 7.47  
OSK-W-17-1270 918.2 926.0 7.8 3.07   Caribou Ext. Caribou
  950.1 953.0 2.9 7.14   Vein Caribou
OSK-W-17-1273 155.9 158.0 2.1 6.72   Z27 Zone 27
including 157.1 158.0 0.9 14.1  
  164.5 167.0 2.5 16.4   Z27 Zone 27
including 165.7 166.2 0.5 80.9  
  171.0 173.2 2.2 29.2   Z27 Zone 27
OSK-W-17-1275 295.7 298.3 2.6 12.4   Caribou Caribou
including 297.8 298.3 0.5 53.2  
OSK-W-17-1276 176.0 178.8 2.8 12.6   Mallard Mallard
including 177.9 178.8 0.9 38.6  
  195.6 197.6 2.0 13.3   Mallard Mallard
including 196.0 196.3 0.3 86.9  
OSK-W-17-1279 146.7 148.9 2.2 4.56   Z27 Zone 27
OSK-W-17-1281 264.0 266.2 2.2 3.24   Caribou Caribou
including 264.9 265.4 0.5 13.3  
  425.0 428.0 3.0 3.25   Z27 Zone 27
  447.9 451.9 4.0 3.37   Z27 Zone 27
OSK-W-17-1282 95.8 98.9 3.1 8.06   Z27 FW Zone 27
OSK-W-17-1288 613.3 615.9 2.6 3.44   Caribou Ext. Caribou
OSK-W-17-1289 39.6 42.2 2.6 5.76   Z27 FW Zone 27
including 41.3 41.8 0.5 23.4  
  314.1 316.7 2.6 5.05   Mallard Mallard
including 315.7 316.4 0.7 13.8  
  368.3 370.8 2.5 3.22   Mallard Mallard
OSK-W-17-1291 282.0 284.0 2.0 3.65   Caribou Ext. Caribou
  305.0 307.0 2.0 11.4   Caribou Ext. Caribou
including 306.0 307.0 1.0 22.6  
OSK-W-17-1292 682.9 686.0 3.1 7.91   Wolf Caribou
including 682.9 683.2 0.3 21.5  
OSK-W-17-1293 584.7 590.0 5.3 3.10   Caribou Ext. Caribou
  601.5 608.0 6.5 3.58   Caribou Ext. Caribou
  645.5 648.0 2.5 3.63   Caribou Ext. Caribou
including 646.4 647.0 0.6 10.2  
OSK-W-17-1296 125.6 128.0 2.4 5.82   Z27 Zone 27
including 125.6 126.0 0.4 23.5  
OSK-W-17-1303 211.0 213.3 2.3 3.74   Caribou Ext. Caribou
OSK-W-17-1305 376.0 378.5 2.5 7.65   Caribou Caribou
including 378.1 378.5 0.4 40.9  
OSK-W-17-1306 987.0 989.6 2.6 14.7   Caribou Ext. Caribou
including 988.2 988.9 0.7 54.2  
OSK-W-17-1308 884.0 889.4 5.4 11.6   Wolf Ext. Caribou
including 888.6 888.9 0.3 66.7  
OSK-W-17-1312 43.0 46.5 3.5 7.56   Z27 HW Zone 27
OSK-W-17-1313 90.9 93.0 2.1 3.34   Caribou Caribou
  122.0 125.0 3.0 5.29   Caribou Caribou
  211.0 213.0 2.0 11.3   Z27 HW Zone 27
  456.0 458.0 2.0 25.2 15.0 Vein  
including 456.5 456.8 0.3 168 100
OSK-W-17-1317 182.9 191.0 8.1 10.0   Z27 Zone 27
including 186.9 188.0 1.1 54.3  
OSK-W-17-1319 215.3 217.3 2.0 7.42   Z27 Zone 27
including 217.0 217.3 0.3 22.8  
OSK-W-17-1320 463.0 465.0 2.0 11.9   Caribou Ext. Caribou
including 463.0 464.0 1.0 23.8  
  472.1 477.3 5.2 5.16   Caribou Ext. Caribou
including 472.1 473.4 1.3 14.1  
  801.0 803.0 2.0 6.04   Caribou Ext. Caribou
including 802.0 803.0 1.0 11.8  
OSK-W-17-1323 433.0 435.2 2.2 5.48   Vein Caribou
OSK-W-17-1326 159.0 161.0 2.0 8.32   Z27 Zone 27
including 160.0 161.0 1.0 16.0  
  180.0 183.3 3.3 6.13   Z27 Zone 27
including 183.0 183.3 0.3 45.1  
OSK-W-17-1332 25.0 27.0 2.0 8.27   New zone TBD 
including 26.2 27.0 0.8 18.8  
OSK-W-17-1333 503.0 506.5 3.5 18.4   Caribou Ext. Caribou
including 504.0 505.0 1.0 53.8  
  593.6 596.0 2.4 4.85   Caribou Ext. Caribou
including 593.6 594.3 0.7 13.8  
  628.0 630.4 2.4 5.89   Caribou Ext. Caribou
including 628.0 628.8 0.8 15.3  
OSK-W-17-1334 338.2 340.7 2.5 3.31
Hole Number From
(m)
To
(m)
Interval
(m)
Au (g/t)
uncut
Au (g/t)
cut to
100 g/t
Zone Corridor
OSK-EAG-12-399 765.5 768.0 2.5 5.57   FW3U Underdog
  773.9 776.0 2.1 5.21   FW3U Underdog
OSK-EAG-13-480 643.2 646.8 3.6 29.1   FW1 Underdog
including 645.2 646.8 1.6 63.0  
  681.0 684.0 3.0 4.67   FW1 FW Underdog
including 683.0 684.0 1.0 11.8  
  722.7 725.5 2.8 4.09   FW2 Underdog
  728.0 730.0 2.0 19.5   FW2 Underdog
including 729.3 729.7 0.4 82.6  
  749.5 751.6 2.1 59.5 15.2 FW2 Underdog
including 750.7 751.0 0.3 410 100
  804.0 814.4 10.4 9.65   FW3 Underdog
including 807.5 810.4 2.9 25.5  
including 814.1 814.4 0.3 25.0  
  820.0 822.6 2.6 6.44   FW3 Underdog
including 821.4 821.7 0.3 31.5  
  911.8 914.0 2.2 7.04   FW3U Underdog
  923.0 925.0 2.0 5.90   FW3U Underdog
OSK-EAG-13-505 329.0 333.8 4.8 8.37   FW1 Underdog
including 332.0 332.8 0.8 28.8  
OSK-EAG-13-520 839.3 841.6 2.3 3.00   FW3U Underdog
OSK-OBM-16-678 599.0 601.0 2.0 3.22   FW3U Underdog
  604.0 606.2 2.2 3.16   FW3U Underdog
  619.0 621.0 2.0 7.10   FW3U Underdog
including 620.0 621.0 1.0 12.9  
OSK-OBM-16-687 749.0 751.0 2.0 3.48   FW3 HW Underdog
OSK-OBM-16-693 645.4 649.0 3.6 13.3   FW3 HW Underdog
  805.0 807.0 2.0 7.36   FW3U Underdog
including 806.0 807.0 1.0 14.2  
OSK-W-16-747 677.6 680.0 2.4 3.89   FW1 Underdog
  813.3 816.0 2.7 6.95   FW2 Underdog
including 813.3 813.7 0.4 26.2  
including 815.4 815.7 0.3 20.2  
  850.3 856.0 5.7 4.95   FW2 Underdog
including 853.0 854.8 1.8 8.53  
  911.7 914.0 2.3 3.92   FW3 Underdog
OSK-W-17-780-W1 1358.5 1360.8 2.3 6.55   FW3 HW Underdog
including 1358.5 1359.0 0.5 19.1  
  1396.5 1398.5 2.0 4.76   FW3 Underdog
OSK-W-17-866-W2 1146.7 1149.0 2.3 9.48   FW1 Underdog
including 1147.6 1148.4 0.8 26.3  
OSK-W-17-885 1018.0 1020.0 2.0 6.44   FW0 HW Underdog
OSK-W-17-885-W1 1065.0 1070.0 5.0 3.18   FW0 Underdog
OSK-W-17-1025 732.0 734.0 2.0 3.23   FW1 Underdog
  806.7 809.5 2.8 8.34   FW1 Underdog
including 806.7 807.6 0.9 20.2  
OSK-W-17-1051-W1 941.0 943.0 2.0 3.96   FW3 Underdog
  1262.0 1264.0 2.0 10.5   FW1 Underdog
OSK-W-17-1125 769.0 778.0 9.0 11.9   FW3 HW Underdog
including 769.0 771.0 2.0 21.1  
including 776.0 778.0 2.0 18.4  
  921.5 923.9 2.4 7.32   VNCR Underdog
including 922.1 922.6 0.5 30.1  
OSK-W-17-1125-W3 900.8 903.0 2.2 3.85   Vein Underdog
including 901.1 901.4 0.3 14.0  
OSK-W-17-1139 785.0 787.2 2.2 11.1   FW2 Underdog
including 785.3 785.8 0.5 47.0  
  888.0 890.0 2.0 6.53   FW3 Underdog
including 889.1 889.6 0.5 24.5  
  1007.0 1009.8 2.8 5.43   FW4 Underdog
including 1009.2 1009.8 0.6 21.9  
OSK-W-17-1208 440.0 442.0 2.0 3.21   Vein Underdog
including 441.0 442.0 1.0 6.41  
OSK-W-17-1239 728.0 730.0 2.0 20.4   FW3U HW Underdog
  759.0 761.0 2.0 5.40   FW3U HW Underdog
including 759.0 760.0 1.0 10.3  
OSK-W-17-1259 364.0 366.0 2.0 38.7   FW4 Underdog
including 365.0 366.0 1.0 77.1  
OSK-W-17-1275 844.0 849.0 5.0 76.5 59.9 FW3U Underdog
including 845.4 846.0 0.6 148 100
including 846.9 847.8 0.9 160 100
OSK-W-17-1287 231.9 234.0 2.1 9.63   QTV Underdog
including 233.1 234.0 0.9 22.4  
OSK-W-17-1295 696.9 699.2 2.3 8.14   New Zone Underdog
including 697.7 698.5 0.8 20.9  
OSK-W-17-1305 722.9 725.5 2.6 14.5   FW3U HW Underdog
including 722.9 723.2 0.3 51.6  
OSK-W-17-1305-W1 858.5 861.0 2.5 14.8   VNCR Underdog
including 860.3 861.0 0.7 47.0  
OSK-W-17-1325 629.2 631.3 2.1 7.57   New Zone Underdog
OSK-W-17-1336 816.0 820.0 4.0 24.0   FW0 Underdog
including 817.5 820.0 2.5 35.6  
  891.0 893.0 2.0 6.64   FW1 Underdog
including 891.0 891.3 0.3 22.3  
  1082.0 1084.5 2.5 15.0   FW3 Underdog
including 1084.0 1084.5 0.5 67.9  
OSK-W-17-1336-W1 992.9 995.0 2.1 42.9 28.8 FW1 Underdog
including 992.9 993.5 0.6 150 100
OSK-W-17-1353 233.9 236.3 2.4 4.66   FW3 Underdog
including 234.5 235.0 0.5 20.1  
OSK-W-17-1354 229.3 231.4 2.1 5.05   FW3 Underdog
including 229.6 230.0 0.4 22.9  
OSK-W-17-1362 337.9 339.9 2.0 4.48   FW4 Underdog
including 339.4 339.9 0.5 15.3  
OSK-W-17-1374 504.0 508.0 4.0 4.84   FW1 Underdog
  526.1 530.0 3.9 3.04   FW1 Underdog

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: HW = Hanging Wall, FW Foot Wall, VNCR = Crustiform Vein, QTV: quartz tourmaline vein
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-EAG-12-399 328 -56 795 452584 5434701 2700
OSK-EAG-13-480 331 -57 991 452400 5434486 2450
OSK-EAG-13-505 330 -51 852 451930 5434493 2025
OSK-EAG-13-520 330 -55 872 452568 5434633 2650
OSK-OBM-16-678 330 -53 717 452347 5434661 2475
OSK-OBM-16-687 330 -56 882 452476 5434592 2550
OSK-OBM-16-693 331 -54 861 452443 5434600 2525
OSK-W-16-747 331 -57 1050 452449 5434488 2475
OSK-W-17-780-W1 331 -60 1533 452929 5434374 2850
OSK-W-17-866-W2 332 -57 1332 452633 5434280 2525
OSK-W-17-885 335 -67 1458 452861 5434494 2850
OSK-W-17-885-W1 335 -67 1383 452861 5434494 2850
OSK-W-17-1025 330 -58 990 452486 5434439 2475
OSK-W-17-1125 331 -58 975 452563 5434568 2625
OSK-W-17-1125-W3 331 -58 1086 452563 5434568 2625
OSK-W-17-1139 333 -56 1092 452473 5434470 2500
OSK-W-17-1208 331 -56 519 451612 5434444 1725
OSK-W-17-1239 326 -53 939 452419 5434554 2475
OSK-W-17-1259 332 -54 414 451520 5434378 1600
OSK-W-17-1275 331 -55 912 452499 5434592 2575
OSK-W-17-1287 332 -54 743 451531 5434331 1600
OSK-W-17-1295 334 57 801 451559 5434288 1600
OSK-W-17-1305 330 -54 888 452499 5434592 2575
OSK-W-17-1305-W1 330 -54 951 452499 5434592 2575
OSK-W-17-1325 331 -69 689 451431 5434333 1500
OSK-W-17-1336 335 -61 1149 452616 5434449 2600
OSK-W-17-1336-W1 335 -61 1335 452616 5434449 2600
OSK-W-17-1353 326 -56 750 451490 5434337 1575
OSK-W-17-1354 333 -50 432 451642 5434469 1775
OSK-W-17-1362 347 -50 624 451642 5434470 1750
OSK-W-17-1374 317 -59 873 452273 5434579 2375

 

OSK-EAG-12-399 intersected FW3U with 5.57 g/t Au over 2.5 metres and 5.21 g/t Au over 2.1 metres. Mineralization is composed of 7% disseminated pyrite in a strongly sericitized andesite at the contact with a moderately sericitized felsic porphyritic dike.

OSK-EAG-13-480 intersected nine intervals: 29.1 g/t Au over 3.6 metres related to FW1, 4.67 g/t Au over 3.0 metres in FW1 FW, 4.09 g/t Au over 2.8 metres, 19.5 g/t Au over 2.0 metres, 59.5 g/t Au over 2.1 metres in FW2, 9.65 g/t Au over 10.4 metres, 6.44 g/t Au over 2.6 metres in FW3 and 7.04 g/t Au over 2.2 metres, 5.90 g/t au over 2.0 metres in FW3U.  The first interval is composed of up to 7% pyrite stringers, local visible gold, disseminated pyrite, chalcopyrite and sphalerite with local tourmaline ptygmatic veins hosted in a porphyriticc felsic dike. Moderate sericitization and pervasive silica flooding are present. The second interval is composed of 1% pyrite stringers and traces of disseminated pyrite in a sericitized porphyritic felsic dike. The three intervals in FW2 are composed of 1% pyrite stringers, 2% disseminated pyrite in pervasive silica flooding, hosted in a sericitized porphyritic felsic dike with fuchsite. The sixth and seventh intervals in FW3 are composed of up to 10% pyrite associated withlocal pervasive silica flooding within a silicified and moderately sericitized porphyritic felsic dike with fuchsite. The eighth and ninth intervals in FW3U, are composed of 1% pyrite stringers, 2% pyrite in pervasive silica flooding within a strongly silicified and sericitized porphyritic felsic dike.

OSK-EAG-13-505 intersected 8.37 g/t Au over 4.8 metres in FW1. The mmineralization is composed of 5% pyrite stringers and traces of tourmaline ptygmatic veinlets within a strongly silicified porphyritic felsic dike with moderate sericite and fuchsite alteration.

OSK-EAG-13-520 intersected 3.00 g/t Au over 2.3 metres in F3WU. Mineralization is composed of 4% disseminated pyrite in a bleached andesite.

OSK-OBM-16-678 intersected 3.22 g/t Au over 2.0 metres, 3.16 g/t Au over 2.2 metres and 7.10 g/t Au over 2.0 metres in FW3U. Mineralisation is composed of up to 10% disseminated pyrite and 5% pyrite stringers hosted in andesite or porphyritic felsic volcanic with strong sericite and weak silica alteration.

OSK-OBM-16-687 intersected 3.48 g/t au over 2.0 metres in FW3 HW. Mineralization is composed of 5% pyrite stringers and 1% ptygmatic tourmaline veins hosted in a fragmental felsic intrusive unit.

OSK-OBM-16-693 intersected 13.3 g/t Au over 3.6 metres and 7.36 g/t Au over 2.0 metres. The first interval is in FW3 HW and composed of trace disseminated or stringer pyrite, locally 30% massive pyrite, with intense pervasive silica flooding hosted in a strongly sericitized porphyric felsic dike. The second interval is related to FW3U and composed of 12% pyrite stringers and 4% disseminated pyrite in a sericitized andesite.

OSK-W-16-747 intersected 3.89 g/t au over 2.4 metres, 6.95 g/t Au over 2.7 metres, 4.95 g/t Au over 5.7 metres and 3.92 g/t Au over 2.3 metres. The first interval in FW1 and composed of 1% of pyrite stringers, 1% pyrite in smoky quartz veins and 2% semi-massive pyrite in sericitized and silicified porphyritic felsic dike. The second and third intervals are related to FW2 and composed of local zones with semi-massive pyrite associated with pervasive silica flooding, local visible gold, and up to 2% pyrite clusters hosted in a moderately sericitized felsic porphyritic dike. The fourth interval is related to FW3U and composed of 7% pyrite stringers in a sericitized porphyritic felsic volcanic with tourmaline and quartz-tourmaline veinlets.

OSK-W-17-780-W1 intersected 6.55 g/t Au over 2.3 metres in FW3 HW and 4.76 g/t Au over 2.0 metres in FW3. Mineralization is composed of 2% pyrite stringers in a strongly sericitized and moderately silicified porphyritic felsic dike.

OSK-W-17-866-W2 intersected FW1 returning 9.48 g/t Au over 2.3 metres. Mineralization is composed of trace disseminated or stringer pyrite hosted in a weakly sericitized and silicified porphyritic felsic dike.

OSK-W-17-885 intersected 6.44 g/t Au over 2.0 metres in FW0 HW. Mineralization is composed of 2% disseminated pyrite in a weakly sericitized an silicified porphyritic felsic dike.

OSK-W-17-885-W1 intersected 3.18 g/t Au over 5.0 metres in FW0. Mineralization is composed of 3% pyrite-tourmaline stringers and 1% pyrite associated with pervasive silica flooding within a fragmental felsic dike.

OSK-W-17-1025 intersected FW1 returning 3.23 g/t Au over 2.0 metres and 8.34 g/t Au over 2.8 metres. The first interval is composed of 4% disseminated and stringer pyrite hosted in a sericitized felsic intrusion. The second interval is composed of 6% pyrite-tourmaline stringers and hosted in the same felsic intrusion.

OSK-W-17-1051-W1 intersected 3.96 g/t Au over 2.0 metres in FW3 and 10.5 g/t Au over 2.0 metres in FW1. Mineralization is composed of traces of pyrite stringers or clusters in a weakly sericitized and silicified porphyritic felsic dike.

OSK-W-17-1125 intersected 11.9 g/t Au over 9.0 metres and 7.32 g/t Au over 2.4 metres. The first interval is in FW3 HW and composed of 3% pyrite stringers in a sericitized porphyritic felsic dike at the contact with a bleached mafic volcanic unit. The second interval is composed of a metre-scale crustiform vein with 25% pyrite stringers hosted in a sericitized gabbro containing 15% disseminated pyrite.

OSK-W-17-1125-W3 intersected 3.85 g/t Au over 2.2 metres in a crustiform vein. The mineralization is within a sericitized felsic dike with carbonate alteration and 15% pyrite as clusters or in quartz-tourmaline veins.

OSK-W-17-1139 intersected three intervals: 11.1 g/t Au 2.2 metres, 6.53 g/t Au over 2.0 metres and 5.43 g/t Au over 2.8 metres. The first interval is in FW2 and composed of 1% pyrite in pervasive silica flooding and 2% pyrite stringers at the contact between two bleached felsic intrusive units with strong silica, sericite and fuchsite alteration. The second interval, in F3W, is a felsic porphyritic dike with moderate sericite, silica, and fuchsite alteration with 2% pyrite stringers and 1% pyrite in smoky quartz veins. The third interval is in FW4 and composed of 8% stringers, 5% disseminated pyrite, 1% tourmaline-pyrite veins and crustiform veins in a moderately chloritized, strongly bleached gabbro at the contact with a felsic dike.

OSK-W-17-1208 intersected 3.21 g/t Au over 2.0 metres. The mineralization is composed of 2% disseminated or clustered pyrite in a quartz vein hosted in a chloritized and strongly sericitized felsic porphyritic dike with fuchsite alteration.

OSK-W-17-1239 intersected 20.4 g/t Au over 2.0 metres and 5.4 g/t au over 2.0 metres in FW3U HW. The mineralization is composed of to up to 4% pyrite stringers in a strongly sericitized and strongly silicified felsic dyke.

OSK-W-17-1259 intersected FW4 zone returning 38.7 g/t Au over 2.0 metres. Mineralization is composed of 1% pyrite stringers and 2% semi-massive pyrite within a sericitized felsic porphyritic dike.

OSK-W-17-1275 intersected 76.5 g/t over 5.0 metres. The mineralization is composed of 10% disseminated pyrite and 2% pyrite stringers in a strongly silicified and sericitized andesite.

OSK-W-17-1287 intersected 9.63 g/t Au over 2.1 metres in a quartz vein. Mineralization is composed of 3% disseminated chalcopyrite, and 2% disseminated pyrite associated with ptygmatic quartz-tourmaline veins, hosted in a porphyritic felsic dike.

OSK-W-17-1295 intersected 8.14 g/t Au over 2.3 metres in a new zone. Mineralization is composed of up to 20% semi-massive pyrite and 1% disseminated chalcopyrite within a strongly sericitized and chloritized andesite. The mineralization is at the contact with a porphyritic felsic dike. This new zone is in the western area of the Underdog corridor, 140 metres south-west of OSK-W-17-1325 (7.57 g/t Au over 2.1 metre, this press release).

OSK-W-17-1305 intersected 14.5 g/t Au over 2.6 metres. The interval is related to FW3 upper zone and is composed of up to 1% pyrite stringers. The mineralization is at the contact between a porphyritic felsic dike and an andesite.

OSK-W-17-1305-W1 intersected 14.8 g/t Au over 2.5 metres. The mineralization is associated with a crustiform quartz vein and composed of 6% disseminated pyrite and 5% pyrite stringers in a moderately silicified andesite.

OSK-W-17-1325 intersected 7.57g/t Au over 2.1 metres. The mineralization is composed of 10% pyrite stringers with trace disseminated tourmaline hosted in a bleached intermediate volcanic unit.

OSK-W-17-1336 intersected 24.0 g/t Au over 4.0 metres, 6.64 g/t Au over 2.0 metres and 15.0g/t Au over 2.5 metres. The first interval is in FW0 and composed of 5% pyrite stringers with tourmaline, 2% disseminated pyrite, and 2% tourmaline ptygmatic veins hosted in a moderately silicified porphyritic felsic dike. The second interval is in FW1 and composed of 5% pyrite stringers and 2% disseminated pyrite, hosted in silicified porphyritic felsic dike. The third interval, in FW3, is composed of 4% pyrite stringers, 1% disseminated pyrite within silica flooding. Local visible gold is observed in association with the pyrite stringers.

OSK-W-17-1336-W1 intersected 42.9 g/t Au over 2.1 metres in FW1. Mineralization is composed of local visible gold, up to 20% pyrite clusters and up to 5% disseminated pyrite in a moderately silicified and weakly sericitized felsic dike.

OSK-W-17-1353 intersected 4.66 g/t Au over 2.4 metres. Mineralization is in FW3 and is composed of 5% pyrite in pervasive silica flooding with traces of pyrite-tourmaline stringers in a silicified and weakly sericitized porphyritic felsic dike.

OSK-W-17-1354 intersected 5.05 g/t Au over 2.1 metres in FW3. 10% semi-massive mineralized horizons with 4% pyrite stringers, 2% pyrite-tourmaline stringers are hosted in a strongly sericitized fragmental felsic dike.

OSK-W-17-1362 intersected 4.48 g/t Au over 2.0 metres in FW4. Mineralization is composed of 10% pyrite with tourmaline ptygmatic veins hosted in a silicified porphyritic felsic dike.

OSK-W-17-1374 intersected 4.84 g/t Au over 4.0 metres and 3.04 g/t Au over 3.9 metres. The first interval is in FW1 and composed of up 10% pyrite and pyrite-tourmaline stringers in a bleached porphyritic felsic dike. The second interval is also in FW1 and composed of up to 5% pyrite and pyrite-tourmaline stringers at a bleached contact between two porphyritic felsic dikes.

Qualified Person
The scientific and technical content of this news release has been reviewed, prepared and approved by Mr. Louis Grenier, M.Sc.A., P.Geo. (OGQ 800), Project Manager of the Windfall Lake gold project, who is a “Qualified Person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”).

Quality Control and Reporting Protocols
True widths determinations are estimated at 65-80% of the reported core length intervals for most of the zones. Assays are uncut except where indicated. Intercepts occur within geological confines of major zones but have not been correlated to individual vein domains at this time. Reported intervals include minimum weighted averages of 3.0 g/t Au diluted over core lengths of at least 2.0 metres. All NQ core assays reported were obtained by either 1-kilogram screen fire assay or standard 50-gram fire-assaying-AA finish or gravimetric finish at ALS Laboratories in Val dOr, Québec, Thunder Bay and Sudbury, Ontario or Vancouver, British Colombia or Bureau Veritas in Timmins, Ontario. The 1-kilogram screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. Selected samples are also analyzed for multi-elements, including silver, using an Aqua Regia-ICP-AES method at ALS Laboratories. Drill program design, Quality Assurance/Quality Control (“QA/QC”) and interpretation of results is performed by qualified persons employing a QA/QC program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the Corporation as well as the lab. Approximately 5% of sample pulps are sent to secondary laboratories for check assay.

About the Windfall Lake Gold Deposit
The Windfall Lake gold deposit is located between Val-dOr and Chibougamau in the Abitibi region of Québec, Canada. The mineral resource defined by the previous operator comprises 2,762,000 tonnes at 8.42 g/t Au (748.000 ounces) in the indicated category and 3,512,000 tonnes at 7.62 g/t Au (860,000 ounces) in the inferred category (sourced from a technical report dated June 10, 2015 entitled “Preliminary Economic Assessment of the Windfall Lake Gold Property, Québec, Canada” with an effective date of April 28, 2015, prepared in accordance with NI 43-101). The Windfall Lake gold deposit is currently one of the highest-grade resource-stage gold projects in Canada. The bulk of the mineralization occurs in the Main Zone, a southwest/northeast trending zone of stacked mineralized lenses, measuring approximately 600 metres wide and at least 1.400 metres long. The deposit is well defined from surface to a depth of 500 metres, and remains open along strike and at depth. Mineralization has been identified only 30 metres from surface in some areas and as deep as 870 metres in others, with significant potential to extend mineralization up and down-plunge and at depth.

About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-dOr and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100% interest in the Marban project located in the heart of Québecs 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. The Corporation also holds interests and options in a number of additional properties in northern Quebec and Ontario.  Osisko continues to be well financed with approximately $190 million in cash and investments.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the Windfall Lake gold deposit being one of the highest grade resource-stage gold projects in Canada; the current 800,000 metre drill program; the significance of new results from the ongoing drill program at the Windfall Lake gold project; the significance of assay results presented in this press release; the type of drilling included in the drill program (definition drilling, expansion drilling to the NE of the main deposit and adjacent Lynx deposit, and exploration drilling on the greater deposit and Urban-Barry project area); potential mineralization; the potential to extend mineralization up and down-plunge and at depth at the Windfall Lake gold deposit; the ability to realize upon any mineralization in a manner that is economic; the ability to complete any proposed exploration activities and the results of such activities, including the continuity or extension of any mineralization; and any other information herein that is not a historical fact may be “forward-looking information”. Any statement that involves discussions with respect to predictions, expectations, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as “expects”, or “does not expect”, “is expected”, “interpreted”, “managements view”, “anticipates” or “does not anticipate”, “plans”, “budget”, “scheduled”, “forecasts”, “estimates”, “believes” or “intends” or variations of such words and phrases or stating that certain actions, events or results “may” or “could”, “would”, “might” or “will” be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to identify forward-looking information. This forward-looking information is based on reasonable assumptions and estimates of management of the Corporation. at the time it was made, involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Osisko to be materially different from any future results, performance or achievements expressed or implied by such forward-looking information. Such factors include, among others, risks relating to the ability of exploration activities (including drill results) to accurately predict mineralization; errors in managements geological modelling; the ability of Osisko to complete further exploration activities, including drilling; property interests in the Windfall Lake gold project; the ability of the Corporation to obtain required approvals and complete transactions on terms announced; the results of exploration activities; risks relating to mining activities; the global economic climate; metal prices; dilution; environmental risks; and community and non-governmental actions. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions. Osisko cannot assure shareholders and prospective purchasers of securities of the Corporation that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither Osisko nor any other person assumes responsibility for the accuracy and completeness of any such forward-looking information, Osisko does not undertake, and assumes no obligation, to update or revise any such forward-looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required by law.

For further information please contact:
John Burzynski. President and Chief Executive Officer
Telephone: (416) 363-8653

Osisko Intersects 2.65 g/t Au Over 70.1 Metres at Garrison

New Results Continue to Expand 903 Zone

(Toronto, January 15, 2018). Osisko Mining Inc. (OSK:TSX, “Osisko” or the “Corporation”) is pleased to announce new results from the 2017 drill program at its 100% owned Garrison gold project located in Garrison Township, Ontario. Over 85,000 metres of new drilling have been conducted by Osisko at the Garrison Project since its acquisition in late 2015. A total of fifty-four new intercepts in twenty-eight holes are reported in this release, with significant assay results presented in the table below.

Highlights from the new drilling include: 2.65 g/t Au over 70.1 metres in OSK-G17-390; 521 g/t Au over 1.0 metre in OSK-G17-450; 1.53 g/t Au over 62.8 metres in OSK-G17-425; 1.81 g/t Au over 32.0 metres in OSK-G17-424;  5.12 g/t Au over 5.0 metres and 3.21 g/t Au over 16.0 metres in OSK-G17-435; 2.72 g/t Au over 17.8 metres in OSK-G17-439;  3.73 g/t Au over 12.0 metres in OSK-G17-429; 1.10 g/t Au over 32.4 metres in OSK-G17-387; 1.15 g/t Au over 27.0 metres in OSK-G17-421; 1.47 g/t Au over 20.9 metres in OSK-G17-469; 2.00 g/t Au over 14.7 metres in OSK-G17-392; 3.41 g/t Au over 19.0 metres in OSK-G-17-431; and 14.9 over 2.0 metres in OSK-G-17-446.

The new results continue to show the increasing potential of the 903 Zone with extension towards SW, NW and South and to confirm the extent of known mineralization in the Garrcon zone. Maps and sections showing hole locations and complete drilling results are available at www.osiskomining.com

Hole No. From (m) To (m) Interval (m) Au (g/t) uncut Au (g/t)
cut to
30 g/t
Zone
OSK-G17-363 68.0 83.0 15.0 1.04   903
  134.0 140.0 6.0 1.03   903
OSK-G17-383 144.0 149.0 5.0 1.41   903
OSK-G17-387 70.0 77.9 7.9 2.39   903
including 75.0 77.9 2.9 4.64   903
  106.9 115.9 9.0 2.88   903
including 112.9 115.9 3.0 5.70   903
  210.9 243.3 32.4 1.10   903
including 215.9 219.1 3.2 3.43   903
OSK-G17-390 118.6 123.0 4.4 1.42   903
  342.1 412.2 70.1 2.65   903
including 361.1 365.0 3.9 8.71   903
including 389.7 395.7 6.1 4.67   903
OSK-G17-392 239.0 242.0 3.0 2.66   903
  251.0 265.7 14.7 2.00   903
including 251.0 254.0 3.0 5.82   903
OSK-G17-413 76.0 83.0 7.0 1.16   Garrcon
  109.0 111.0 2.0 4.99   Garrcon
OSK-G17-416 10.3 39.8 29.5 0.87   Garrcon
including 10.3 21.8 11.5 1.32   Garrcon
OSK-G17-418 264.0 266.5 2.5 3.33   903
OSK-G17-421 18.0 28.0 10.0 1.40   Garrcon
  57.5 89.0 31.5 0.83   Garrcon
  147.0 174.0 27.0 1.15   Garrcon
including 161.0 164.0 3.0 4.48   Garrcon
OSK-G17-424 214.3 225.0 10.7 1.43   903
  232.0 264.0 32.0 1.81   903
including 248.8 264.0 15.2 2.99   903
OSK-G17-425 38.4 101.1 62.8 1.53   903
including 43.5 47.0 3.5 6.53   903
and 67.0 70.5 3.5 6.12   903
  163.0 165.0 2.0 10.2   903
OSK-G17-428 98.5 101.1 2.6 4.10   903
  113.0 118.0 5.0 2.24   903
  134.8 158.3 23.5 0.82   903
including 139.0 143.0 4.0 2.60   903
  202.1 210.8 8.7 0.96   903
OSK-G17-429 124.3 135.2 10.9 1.64   Garrcon
  167.0 173.0 6.0 2.45   Garrcon
  206.0 218.0 12.0 3.73   Garrcon
  444.0 446.0 2.0 8.53   Garrcon
  532.0 549.0 17.0 1.29   Garrcon
OSK-G17-430 124.9 131.6 6.7 1.49   903
OSK-G17-431 82.5 100.2 17.7 1.21   903
  121.0 140.0 19.0 3.41   903
including 121.0 127.0 6.0 6.96   903
OSK-G17-432 137.3 140.0 2.7 2.17   903
OSK-G17-433 490.0 492.0 2.0 6.01   Garrcon
OSK-G17-434 110.2 118.7 8.5 3.78   903
OSK-G17-435 25.0 30.0 5.0 5.12   903
including 27.0 28.0 1.0 20.7   903
  190.0 206.0 16.0 3.21   903
Including 193.5 197.0 3.5 9.56   903
OSK-G17-439 320.5 338.0 17.5 1.32   903
  378.5 396.3 17.8 2.72   903
including 387.0 391.6 4.6 4.17   903
OSK-G17-440 259.7 271.3 11.6 1.62   Garrcon
including 266.3 269.3 3.0 4.87   Garrcon
  287.5 296.9 9.35 1.07   Garrcon
OSK-G17-441 297.0 315.4 18.4 1.24   903
  319.1 320.9 1.8 3.85   903
OSK-G17-446 415.5 417.5 2.0 14.9 7.52 Garrcon
 including 416.2 416.7 0.5 59.7 30.0 Garrcon
  426.0 440.0 14.0 1.60   Garrcon
including 430.5 432.0 1.5 8.02   Garrcon
OSK-G17-450 101.0 129.0 28.0 0.89   Garrcon
including 107.9 124.0 16.1 1.1   Garrcon
  154.0 155.0 1.0 13.0   Garrcon
  158.0 159.0 1.0 521 30.0 Garrcon
OSK-G17-452 90.0 106.0 16.0 1.62   903
OSK-G17-455 37.5 39.6 2.1 2.95   903
  49.3 67.0 17.7 1.07   903
OSK-G17-464 83.5 86.0 2.5 8.67 3.77 903
including 84.6 84.9 0.3 70.8 30.0 903
OSK-G17-469 396.1 417.0 20.9 1.47   903

Notes: True Widths are estimated at 65 – 90% of the reported core length interval. See “Quality Control” below.

Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-G17-363 340 -45 350 577618 5373265 2400W
OSK-G17-383 340 -45 320 576923 5373130 3100W
OSK-G17-387 340 -45 324 577165 5373196 2850W
OSK-G17-390 340 -45 475 577568 5373111 2500W
OSK-G17-392 340 -45 339 576974 5373137 3050W
OSK-G17-397 340 -45 437 577631 5373231 2400W
OSK-G17-413 280 -60 90 578665 5373876 2950W
OSK-G17-416 280 -55 115 578701 5373894 1250W
OSK-G17-418 340 -45 268 576908 5373171 3100W
OSK-G17-421 280 -60 130 578712 5373917 1225W
OSK-G17-424 340 -45 445 577124 5373161 2900W
OSK-G17-425 340 -45 273 577148 5373243 2850W
OSK-G17-428 340 -45 328 577280 5373171 2750W
OSK-G17-429 0 -90 736 578740 5373840 1150W
OSK-G17-430 340 -45 280 576552 5372980 3500W
OSK-G17-431 340 -50 352 577412 5373248 2600W
OSK-G17-432 340 -45 200 576879 5373277 3100W
OSK-G17-433 0 -90 705 578919 5374006 925W
OSK-G17-434 340 -50 200 576693 5373177 3300W
OSK-G17-435 340 -70 175 577027 5373284 2950W
OSK-G17-436 340 -45 490 577390 5373015 2700W
OSK-G17-439 340 -50 425 576934 5372808 3200W
OSK-G17-440 340 -50 540 578784 5373718 1150W
OSK-G17-441 340 -45 439 577604 5373160 2450W
OSK-G17-442 340 -45 814 577962 5373419 2025W
OSK-G17-444 340 -45 818 578080 5373386 1950W
OSK-G17-446 340 -50 705 578513 5373658 1425W
OSK-G17-450 340 -50 630 578586 5373823 1300W
OSK-G17-451 340 -45 150 577196 5373255 2800W
OSK-G17-452 340 -45 170 577220 5373189 2800W
OSK-G17-455 340 -45 166 577246 5373265 2750W
OSK-G17-464 340 -45 350 576587 5373174 3400W
OSK-G17-469 340 -45 300 576794 5372750 3350W

 

OSK-G17-363, and OSK-G17-397 were drilled in the eastern part of the 903 Zone, along the same section 2400W. OSK-G17-363 intersected two mineralized zones: 1.04 g/t Au over 15 metres in a quartz-iron carbonate breccia/iron carbonate + hematite altered metasediment; the second mineralized zone intersected 1.03 g/t Au over 6.0 metres within a strong albite-hematite altered porphyritic syenite.

OSK-G17-383, OSK-G17-418, and OSK-G17-432 were drilled above OSK-G17-352 to extend the mineralization previously intercepted in syenite dykes in that hole. OSK-G17-383 intersected a mineralized zone within albite-hematite + iron carbonate altered metasediment averaging 1.41g/t Au over 5.0 metres. OSK-G17-418 and OSK-G17-432 intercepted the same shear zone located at the contact between ultramafic rocks and a minor lamprophyre dyke returning 3.33 g/t Au over 2.5 metres and 2.17 g/t Au over 2.7 metres, respectively.

OSK-G17-387 and OSK-G17-425 were drilled in the same section 2850W in the central part of the 903 Zone. OSK-G17-387 intersected three mineralized zones: 2.39 g/t Au over 7.9 metres and 2.88 g/t Au over 9.0 metres associated with quartz veining, albite alteration and sulfides within a sub-vertical syenite dyke. The third mineralized zone returned 1.10 g/t Au over 32.4 metres, and is hosted by metasediments at the base of their discordant contact with ultramafic rocks. OSK-G17-425 intersected two mineralized zones: 1.53 g/t Au over 62.8 metres within a massive albite-hematite altered porphyritic syenite. The second mineralized zone is hosted within a shear zone in ultramafic rocks, with fragments of syenite and lamprophyre, averaging 10.18 g/t Au over 2.0 metres

OSK-G17-390 intercepted 1.42 g/t Au over 4.0 metres associated with a minor brown dyke altered with albite and biotite, with quartz veinlets and pyrite dissemination. The hole also intercepted a wide syenite dyke with strong albite-hematite alteration and zones of abundant quartz veining, specularite and euhedral pyrite dissemination returning 2.65 g/t Au over 70.1 metres. OSK-G17-390 represents one of the best mineralized zones intercepted so far at the 903 Zone.

OSK-G17-392 was drilled 200 metres west of hole OSK-G17-387 and OSK-G17-425 in the central 903 Zone, intersecting two mineralized zones associated to iron carbonate + hematite altered metasediments, near the discordant contact between sediments and ultramafic rocks. The first interval averaged 2.66 g/t Au over 3.0 metres, and the second zone averaged 2.00 g/t Au over 14.7 metres. This deeper zone represents the strike extension of the zone described in OSK-G17-425 above.

OSK-G17-413, -416, -421 were designed to test the mineralized zone dipping below the Garrcon east bulk sample pit. OSK-G17-413 intersected 1.16 g/t Au over 7.0 metres and 4.99 g/t Au over 2.0 metres; OSK-G17-416 intersected 0.87 g/t Au over 29.5 metres; OSK-G17-421 intersected 1.40 g/t Au over 10.0 metres, 0.83 g/t Au over 31.5 metres, and 1.15 g/t over 27.0 metres. Mineralization is closely associated with the N-NE trending, east dipping, quartz iron carbonate veins, breccias and fractures showing albite, sericite, and iron carbonate alteration of the host rock. Local pyrite concentrations up to 2% along with local visible gold within the veins mark the most common mineralization seen. 

OSK-G17-424 was an infill hole which intersected two mineralized zones: albite-hematite altered porphyritic syenite, with strong 2-5 cm quartz-carbonate veins, averaging 1.43 g/t Au over 10.7 metres; the second mineralized zone is hosted within iron carbonate + hematite altered metasediments near the contact with fuchsite altered ultramafic volcanics, averaging 1.81 g/t Au over 32.0 metres.

OSK-G17-428 intersected three mineralized zones hosted in syenite dikes, averaging 4.10 g/t Au over 2.6 metres; 2.24 g/t Au over 5.0 metres; and 0.82 g/t Au over 23.5 metres. The three dikes show typical 903 mineralization: quartz – carbonate veinlets with pyrite halos hosted by albite – hematite – carbonate altered syenite.

OSK-G17-429 was drilled in Garrcon, 100 metres southeast of the east bulk sample pit and intersected several mineralized intevals associated with vein and fracture zones with albite-hematite + iron carbonate haloes hosted by metasediments including: 1.64 g/t Au over 10.9 metres; 2.45 g/t Au over 6.0 metres; 3.73 g/t Au over 12.0 metres; 8.53 g/t Au over 2.0 metres; and 1.29 g/t Au over 17.0 metres.

OSK-G17-430 intersected 1.49 g/t Au over 6.7 metres within a strong albite-hematite + iron carbonate altered porphyritic syenite.

OSK-G17-431 intersected two mineralized zones consisting of strong albite-hematite altered porphyritic syenites with moderate quartz-carbonate veins, averaging 1.21 g/t Au over 17.7 metres and 3.41 g/t Au over 19.0 metres.

OSK-G17-433 intersected 6.01 g/t Au over 2.0 metres within sericite and iron carbonate altered metasediment.

OSK-G17-434 was drilled as an infill hole and intersected 3.78 g/t Au over 8.5 metres within a sheared albite-hematite-magnetite altered zone with mixed syenite and lamprophyre dykes.

OSK-G17-435 intersected two zones: mineralization within an albite-hematite + iron carbonate altered porphyritic syenite, averaging 5.12 g/t Au over 5.0 metres, and the second mineralization zone of green sericite – iron carbonate – pyrite alteration in weakly laminated metasediments near the contact with fuchsite altered ultramafic rocks, returning 3.21 g/t Au over 16.0 metres.

OSK-G17-439 intersected two mineralized zones: the first zone of 1.32 g/t Au over 17.5 metres, and the second zone of 2.72 g/t Au over 17.8 metres. Both zones are hosted by syenite dykes with strong albite-hematite alteration, quartz-carbonate veining and pyrite dissemination.

OSK-G17-440 intersected two mineralized zones in iron carbonate + sericite altered metasediment. The first zone of 1.62 g/t Au over 11.55 metres and the second zone, with stronger quartz-carbonate veining, returned 1.07 g/t Au over 9.35 metres.

OSK-G17-441 intersected two mineralization zones within albite-hematite altered porphyritic syenite averaging 1.24 g/t Au over 18.4 metres, and 3.85 g/t Au over 1.8 metres. This mineralization may represent an east extension of the mineralized zone intercepted in OSK-G17-390.

OSK-G17-446 intersected two mineralized zones: 14.9 g/t Au over 2.0 metres within altered metasediment with quartz-carbonate veinlets with local visible gold; and 1.60 g/t Au over 14.0 metres within grey sandstones with quartz-carbonate veinlets and sericite – iron carbonate halos.

OSK-G17-450 intersected 0.89 g/t Au over 28.0 metres, 13.0 g/t Au over 1 metre and one bonanza grade intercept of 521 g/t Au over 1 metre. Mineralization occurs in areas with patches of albite, sericite, and iron carbonate associated with quartz – carbonate veinlets hosted by sediments.

OSK-G17-452 intersected 1.62 g/t Au over 16.0 metres within a strong albite-hematite altered syenite, with quartz, carbonate veinlets, specularite and pyrite.

OSK-G17-455 intersected two mineralized zones: fuchsite altered ultramafic volcanics with quartz-carbonate veins averaging 2.95 g/t Au over 2.1 metres; the second zone consists of a porphyritic syenite with strong albite alteration and quartz-carbonate veinlets averaging 1.07 g/t Au over 17.7 metres.

OSK-G17-464 intersected 8.67 g/t Au over 2.5 metres within ultramafic volcanics with strong quartz-carbonate veining.

OSK-G17-469 intersected 1.47 g/t Au over 20.89 metres in a mineralized zone with albite-hematite altered syenites intercalated with chlorite + sericite altered ultramafic volcanics with strong quartz-carbonate veining.

Qualified Person
The scientific and technical content of this press release has been reviewed, prepared and approved by Mr. Gernot Wober, P.Geo. VP Exploration Canada for Osisko Mining Inc, who is a “Qualified Person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”).

Quality Control
True widths of the new exploration intercepts reported in this press release have yet to be determined, but are typically 65 – 90% of reported core lengths. 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 2 metres using a lower cutoff of 1.0 g/t Au. All HQ core assays reported were obtained by either whole sample rock metallic screen/fire assay or standard 30 gram fire-assaying with ICP finish at SGS Minerals Services in Cochrane, Ontario; and Bureau Veritas in Timmins, Ontario. The whole sample 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 3g/t. Drill program design, Quality Assurance/Quality Control and interpretation of results is 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% of sample pulps are sent to secondary laboratories for check assays.

About the Garrison Project
The Garrison Project area is comprised of 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. (entitled “Technical Report on the Golden Bear Project – Garrison Property: Larder Lake Mining Division, Garrison Township, Ontario, Canada”) dated December 30, 2013, with an effective date of December 30, 2013 (the “Garrison Technical Report”). The Garrison Technical Report was prepared by A.C.A. Howe International Limited for Northern Gold Mining Inc. (a wholly-owned subsidiary of Osisko) and is available on Osiskos website at www.osiskomining.com and on SEDAR under Northern Gold Mining Inc.s issuer profile at www.sedar.com.

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

At the Jonpol Zone, resources were estimated as 0.87 million tonnes averaging 5.34 g/t Au (150,000 oz) in the indicated category; and 1.07 million tonnes averaging 5.56 g/t Au (192,000 oz) in inferred resources. Resources were reported at a cut-off grade of 3.0 g/t Au and assume an underground extraction scenario using a gold price of US$1,250/oz.

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 cross cuts, mining underground veins. Diamond drilling by Cominco and Lac Minerals Ltd. in the mid-to-late 1980s identified broad sections of low grade mineralization. In 2006-2007, ValGold Resources Ltd. conducted additional drilling confirming these zones. From 2009-2013 Northern Gold Mining Inc. conducted 97,000 metres of diamond drilling which delineated the current resource.

In 2014, Northern Gold Mining Inc. was granted a trial mining permit allowing the extraction of up to 150,000 tonnes. Northern Gold Mining Inc. mined 73,534 dry tonnes which was processed at the nearby Holt mill facility recovering 3,516 oz at an average head grade of 1.55 g/t and recovery of 95.9%.

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 kilometers. 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 Limited with an average grade of 6.7 g/t which produced 9,476 ounces Au. From 1985-2013, 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 metres 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.

903 Zone
This third mineralized zone present at Garrison was not included in the resource estimate reported by the previous operator in 2013. Mineralization at the 903 was discovered in 1945 by Wright-Hargreaves Mines Ltd. In 1988 Lac Minerals acquired the claims covering the current 903 Zone and completed 17 drill holes totaling 4,823 metres. The property was optioned in 1990 to Jonpol and T&H Resources and subsequently returned to Lac Minerals in 1991. Northern Gold acquired the claims from a subsidiary of Barrick Gold in 2013, conducting surface exploration and six drill holes.

About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-dOr and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area, a 100% interest in the Marban project located in the heart of Québecs prolific Abitibi gold mining district, and properties in the Larder Lake Mining Division in northeast Ontario, including the Garrcon and Jonpol zones on the Garrison property. Osisko continues to be well financed and has approximately $192 million in cash and equity investment.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the ongoing drill program at the Garrison gold project; results of the current drill program; the significance of new drill results reported in this press release; the ability of new drill results to demonstrate potential for expansion of the previously defined Garrcon, Jonpol and 903 mineralized zones at the Garrison project; the scope of the 2017 drill program; that the 2017 drill program will follow new extensions of these mineralized zones to further define the scale of mineralization at the Garrison project; potential mineralization; the ability to realize upon any mineralization in a manner that is economic; the ability to complete any proposed exploration activities and the results of such activities; the continuity or extension of any mineralization; and any other information herein that is not a historical fact may be “forward-looking information”. Any statement that involves discussions with respect to predictions, expectations, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as “expects”, or “does not expect”, “is expected”, “interpreted”, “managements view”, “anticipates” or “does not anticipate”, “plans”, “budget”, “scheduled”, “forecasts”, “estimates”, “believes” or “intends” or variations of such words and phrases or stating that certain actions, events or results “may” or “could”, “would”, “might” or “will” be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to identify forward-looking information. This forward-looking information is based on reasonable assumptions and estimates of management of the Corporation, at the time it was made, involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Osisko to be materially different from any future results, performance or achievements expressed or implied by such forward-looking information. Such factors include, among others, risks relating to the ability of exploration activities (including drill results) to accurately predict mineralization; errors in managements geological modelling; the ability of Osisko to complete further exploration activities, including drilling; property interests; the ability of the Corporation to obtain required approvals and complete transactions on terms announced; the results of exploration activities; risks relating to mining activities; the global economic climate; metal prices; dilution; environmental risks; and community and non-governmental actions. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions, Osisko cannot assure shareholders and prospective purchasers of securities of the Corporation that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither Osisko nor any other person assumes responsibility for the accuracy and completeness of any such forward-looking information. Osisko does not undertake, and assumes no obligation, to update or revise any such forward-looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required by law.

For further information please contact:
John Burzynski, President and Chief Executive Officer
Telephone: (416) 363-8653

Osisko Mining Inc. Files Early Warning Report in Respect of Beaufield Resources Inc.

Toronto, Ontario (January 10, 2018) – Osisko Mining Inc. (TSX: OSK) (the “Corporation“) announces that it has filed an early warning report in respect of its holdings in Beaufield Resources Inc. (“Beaufield“). The Corporation, through its wholly-owned subsidiary O3 Investments Inc., acquired beneficial ownership of, or control and direction over, 16,923,500 common shares of Beaufield (collectively, the “Purchased Shares” and each, a “Purchased Share“) by way of a share purchase agreement transaction (and not through the facilities of the TSX Venture Exchange), representing approximately 8.2% of the issued and outstanding common shares of Beaufield (“BFD Shares“) at a price of $0.14 per BFD Share for total consideration of $2,369,290 (the “Purchase“). After giving effect to the Purchase, the Corporation, through its wholly-owned subsidiary O3 Investments Inc., acquired beneficial ownership of, or control and direction over, additional BFD Shares in an amount equal to more than 2% of the outstanding BFD Shares, thereby triggering the requirement to file an early warning report.

Prior to giving effect to the Purchase, the Corporation, through its wholly-owned subsidiary O3 Investments Inc., held beneficial ownership of, or control and direction over, 39,197,300 BFD Shares, representing approximately 18.8% of the number of issued and outstanding BFD Shares. After giving effect to the Purchase, the Corporation, through its wholly-owned subsidiary O3 Investments Inc., held beneficial ownership of, or control and direction over, 56,181,300 BFD Shares, representing approximately 27.0% of the number of issued and outstanding BFD Shares.

The Corporation, through its wholly-owned subsidiary O3 Investments Inc., acquired the Purchased Shares for investment purposes. The Corporation has no current intention of increasing or decreasing its ownership of, or control or direction over, additional securities of Beaufield. The Corporation reviews its holdings from time to time and may increase or decrease its position as future circumstances may dictate.

The Corporation completed the Purchase in reliance on the private agreement exemption in section 4.2 of National Instrument 62-104 – Take-Over Bids and Issuer Bids (“NI 62-104“). The Corporation purchased the Purchased Shares from fewer than 5 sellers and at a price less than 115% of the market price, in each case as calculated in NI 62-104.

This news release is being issued in accordance with National Instrument 62-103 – The Early Warning System and Related Take-Over Bid and Insider Reporting Issues in connection with the filing of an early warning report dated January 10, 2018. The early warning report respecting the Purchase has been filed on System for Electronic Document Analysis and Review (“SEDAR“) at www.sedar.com under Beaufields issuer profile. To obtain a copy of the early warning report filed by the Corporation, please contact John Burzynski at (416) 363-8653 or refer to the SEDAR at www.sedar.com under Beaufields issuer profile.

For further information on the Corporation please contact:

John Burzynski
President & Chief Executive Officer
Telephone: (416) 363-8653

The Corporations head office is located at 155 University Avenue, Suite 1440, Toronto, Ontario M5H 3B7.

Osisko Intersects 140 g/t Au Over 5.0 Metres At Lynx

(Toronto, January 9, 2018)  Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec. The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall). 

Significant new analytical results from 90 intercepts in 52 drill holes focused on infill and expansion drilling in the Lynx deposit are presented below. Osisko continues to extend the known Lynx zones of mineralization through the application of the Windfall geological model and as the density of drilling increases.

  • The main Lynx Corridor has been extended up plunge 250 metres SW from the last drill intercept for a total current strike length of confirmed mineralization over 1,550 metres and remains open.
  • Lynx HW is showing good continuity and grades towards the NE.
  • Lynx 4 has been extended 75 metres NE for a total current strike length of 1,350 metres and new infill drillholes continue to demonstrate continuity and robust gold grades between sections 3650E and 4225E.

Highlights from the new results include: 140 g/t Au over 5.0 metres in OSK-W-17-1343; 210 g/t Au over 2.4 metres in OSK-W-17-923;  28.3 g/t Au over 7.7 metres in OSK-W-17-1193; 83.0 g/t Au over 2.0 metres in OSK-W-17-1059;  43.1 g/t Au over 4.4 metres in OSK-W-1343-W2;  48.7 g/t Au over 2.6 metres in OSK-W-17-1104;  43.8 g/t Au over 2.5 metres in OSK-W-17-1242;  22.6 g/t Au over 4.8 metres in OSK-W-17-888;  16.0 g/t Au over 5.5 metres and 22.9 g/t Au over 2.4 metres in OSK-W-17-1177;  29.8 g/t Au over 2.2 metres in OSK-W-17-1085;  14.8 g/t Au over 4.4 metres in OSK-W-1193-W1;  27.9 g/t Au over 2.4 metres in OSK-W-17-1181-W1; and 20.6 g/t Au over 2.2 metres in OSK-17-W-945. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Hole No. From (m) To (m) Interval (m) Au (g/t) uncut Au (g/t)
cut to 100 g/t
Zone Corridor
OSK-W-17-883 229.0 231.0 2.0 10.3   Lynx 1 Lynx
OSK-W-17-888 235.2 240.0 4.8 22.6 21.8 Lynx 2 Lynx
including 236.0 237.2 1.2 52.3 48.9
including 236.3 236.75 0.45 109 100
OSK-W-17-888 248.0 250.0 2.0 17.8   Lynx 2 Lynx
including 248.5 249.1 0.6 58.1  
OSK-W-17-888 257.3 259.4 2.1 4.06   Lynx 2 Lynx
including 257.3 257.8 0.5 16.2  
OSK-W-17-902 398.0 400.0 2.0 3.67   QTV Lynx
including 398.8 399.2 0.4 16.8  
OSK-W-17-902 431.0 433.1 2.1 11.7   VNCR Lynx
including 431.0 432.1 1.1 22.0  
OSK-W-17-909-W2 795.8 797.9 2.1 19.2   Lynx 1 Lynx
including 797.4 797.9 0.5 61.6  
OSK-W-17-909-W3 824.0 826.0 2.0 5.93   Lynx 1 Lynx
including 824.7 825.0 0.3 39.0  
OSK-W-17-909-W3 836.2 838.3 2.1 5.86   Lynx 1 Lynx
OSK-W-17-923 890.1 892.5 2.4 210 44.3 Lynx 4 Lynx
including 890.8 891.8 1.0 498 100
including 890.8 891.3 0.5 838 100
OSK-W-17-945 466.6 468.8 2.2 20.6   Lynx 1 Lynx
including 466.6 467.6 1.0 44.5  
OSK-W-17-945 472.8 476.8 2.0 7.74   Lynx 1 Lynx
including 474.8 476.0 1.2 16.7  
OSK-W-17-953 370.0 372.0 2.0 6.02   Lynx 3 Lynx
including 370.8 371.1 0.3 38.1  
OSK-W-17-998 261.0 263.0 2.0 15.8   Lynx 1 + Lynx 2 Lynx
including 261.0 262.0 1.0 31.5  
OSK-W-17-1006 707.8 710.0 2.2 13.8   Lynx 4 Lynx
including 707.8 708.4 0.6 49.1  
OSK-W-17-1015 344.1 346.2 2.1 4.02   Lynx 2 Lynx
including 344.9 345.5 0.6 13.7  
OSK-W-17-1015 357.9 360.5 2.6 6.26   Lynx 2 Lynx
including 358.8 359.2 0.4 33.7  
OSK-W-17-1015 400.0 402.3 2.3 8.38   VNCR Lynx
including 400.7 401.7 1.0 19.0  
OSK-W-17-1019 227.0 229.0 2.0 11.3   Lynx 1 Lynx
including 227.5 228.5 1.0 22.6  
OSK-W-17-1019 329.0 331.2 2.2 3.21   Lynx 4 Lynx
including 329.5 330.0 0.5 13.5  
OSK-W-17-1019 589.0 591.0 2.0 9.04   Vein Lynx
OSK-W-17-1024 134.0 136.0 2.0 3.97   Lynx 1 Lynx
OSK-W-17-1024 138.0 140.0 2.0 3.64   Lynx 1 Lynx
OSK-W-17-1027 604.0 606.0 2.0 3.85   Lynx 2 Lynx
OSK-W-17-1027 625.0 627.2 2.2 12.2   Vein Lynx
including 626.0 627.2 1.2 22.3  
OSK-W-17-1027 779.5 782.0 2.5 3.47   Lynx HW Lynx
OSK-W-17-1028 76.0 78.0 2.0 8.18   Lynx 1 Lynx
including 770. 77.3 0.3 45.4  
OSK-W-17-1040 162. 164.0 2.0 15.9   Lynx 2 Lynx
including 162.3 162.7 0.4 68.3  
OSK-W-17-1043 374.0 376.0 2.0 3.11   Lynx 1 + Lynx 2 Lynx
OSK-W-17-1044 264.6 266.7 2.1 3.59   Lynx 2 Lynx
OSK-W-17-1059 264.0 266.0 2.0 83.0 55.9 Lynx 3 Lynx
including 264.9 266.0 1.1 149 100
OSK-W-17-1059 362.8 365.2 2.4 17.7   Lynx 1 Lynx
including 362.8 364.0 1.2 33.6  
OSK-W-17-1067 512.6 515.7 3.1 4.54   Lynx HW Lynx
OSK-W-17-1072-W2 842.8 845.9 3.1 5.24   Lynx 4 Lynx
OSK-W-17-1072-W2 885.2 887.2 2.0 17.7   Lynx 4 Lynx
including 886.9 887.2 0.3 98.2  
OSK-W-17-1072-W2 908.0 911.0 3.0 8.60   Lynx 4 Lynx
including 910.6 911.0 0.4 56.6  
OSK-W-17-1072-W2 915.0 917.0 2.0 10.9   Lynx 4 Lynx
including 915.5 916.2 0.7 30.9  
OSK-W-17-1072-W2 989.7 992.0 2.3 17.1   Lynx 4 Lynx
including 990.1 990.4 0.3 127  
OSK-W-17-1072-W2 1019.7 1022.0 2.3 4.16   Lynx 4 Lynx
including 1020.2 1020.5 0.3 31.0  
OSK-W-17-1072-W3 906.6 909.0 2.4 4.02   Lynx 4 Lynx
OSK-W-17-1085 230.0 232.5 2.5 4.41   Lynx 1 Lynx
OSK-W-17-1085 328.5 330.7 2.2 29.8   Lynx 2 Lynx
including 329.5 330.7 1.2 54.6  
OSK-W-17-1099 83.0 85.0 2.0 7.87   Lynx 1 Lynx
including 83.0 83.3 0.3 51.9  
OSK-W-17-1104 857.4 860.0 2.6 48.7 27.3 Vein Lynx
including 857.4 858.0 0.6 193 100
OSK-W-17-1112 603.0 605.1 2.1 9.96   Lynx HW Lynx
including 604.0 604.7 0.7 24.0  
OSK-W-17-1113 374.1 376.2 2.1 6.35   Lynx 2 Lynx
including 374.7 375.2 0.5 25.2  
OSK-W-17-1113 382.4 387.0 4.6 8.46   Lynx 1 + Lynx 2 Lynx
including 386.4 387.0 0.6 22.2  
OSK-W-17-1128 985.5 988.5 3.0 17.4   Lynx 4 Lynx
including 987.0 988.5 1.5 32.3  
OSK-W-17-1128 1256.0 1258.0 2.0 4.49   TBD Lynx
including 1257.0 1257.7 0.7 12.7  
OSK-W-17-1128 1286.1 1288.1 2.0 8.25   TBD Lynx
including 1286.1 1286.7 0.6 20.0  
OSK-W-17-1131 135.0 137.0 2.0 3.28   Lynx 1 Lynx
including 136.4 137.0 0.6 10.8  
OSK-W-17-1166-W1 662.0 665.0 3.0 3.32   TBD Lynx
OSK-W-17-1166-W1 676.3 682.0 5.7 3.13   TBD Lynx
including 676.3 677.0 0.7 11.4  
OSK-W-17-1166-W1 799.0 801.0 2.0 3.12   Lynx 1 Lynx
OSK-W-17-1166-W2 1048.6 1050.8 2.2 5.06   Vein Lynx
OSK-W-17-1166-W3 941.4 944.0 2.6 4.21   VNCR Lynx
OSK-W-17-1166-W3 969.4 971.5 2.1 6.63   QTV Lynx
including 969.4 970.0 0.6 16.1  
OSK-W-17-1166-W3 1267.0 1269.1 2.1 6.96   Lynx 6 Lynx
including 1267.5 1268.2 0.7 16.6  
OSK-W-17-1166-W3 1477.0 1479.0 2.0 4.05   TBD Lynx
including 1477.0 1477.4 0.4 16.8  
OSK-W-17-1168 213.0 217.0 4.0 6.05   Lynx 3 Lynx
including 216.0 217.0 1.0 14.5  
OSK-W-17-1169 624.0 627.0 3.0 9.75   Lynx 1 Lynx
including 625.5 627.0 1.5 19.4  
OSK-W-17-1170 232.0 234.0 2.0 4.22   VNCR Lynx
OSK-W-17-1170 417.0 419.0 2.0 3.23   Vein Lynx
including 417.0 417.5 0.5 12.3  
OSK-W-17-1177 571.0 576.5 5.5 16.0   Lynx 1 Lynx
including 572.2 573.0 0.8 97.6  
OSK-W-17-1177 764.0 766.4 2.4 22.9   TBD Lynx
including 765.3 766.0 0.7 77.0  
OSK-W-17-1181 933.5 936.0 2.5 4.46   Lynx 4 Lynx
including 934.25 935.1 0.85 12.7  
OSK-W-17-1181-W1 920.9 923.3 2.4 27.9 25.6 Lynx 1 Lynx
including 921.5 922.1 0.6 110 100
OSK-W-17-1181-W1 1030.0 1032.3 2.3 14.4   Lynx 4 Lynx
including 1031.1 1031.7 0.6 48.2  
OSK-W-17-1181-W1 1040.5 1042.6 2.1 4.66   Lynx 4 Lynx
including 1041.0 1041.8 0.8 12.2  
OSK-W-17-1181-W2 909.0 915.0 6.0 5.92   Lynx 1 Lynx
OSK-W-17-1181-W2 938.0 942.0 4.0 4.60   Lynx 4 Lynx
OSK-W-17-1181-W2 949.0 954.0 5.0 10.5   Lynx 4 Lynx
including 949.5 950.0 0.5 59.5  
OSK-W-17-1181-W2 961.1 963.2 2.1 41.0   Lynx 4 Lynx
OSK-W-17-1181-W3 1097.5 1101.0 3.5 5.31   Lynx 4 Lynx
OSK-W-17-1187 264.0 266.7 2.7 3.43   Lynx 3 Lynx
OSK-W-17-1193 971.3 979.0 7.7 28.3 24.9 Lynx 4 Lynx
including 971.3 974.4 3.1 66.5 58.1
OSK-W-17-1193-W1 947.6 952.0 4.4 14.8   VNCR Lynx
including 947.6 948.1 0.5 27.7  
including 950.5 951.5 1.0 45.5  
OSK-W-17-1242 820.0 822.5 2.5 3.68   Lynx 4 Lynx
including 821.3 822.1 0.8 9.25  
OSK-W-17-1242 871.0 873.0 2.0 4.38   Lynx 4 Lynx
including 871.7 872.2 0.5 15.3  
OSK-W-17-1242 1032.0 1034.5 2.5 43.8  12.3 Lynx 4 Lynx
including 1034.2 1034.5 0.3 362 100 
OSK-W-17-1242-W2 601.0 603.0 2.0 7.18   Lynx HW Lynx
including 602.1 603.0 0.9 13.2  
OSK-W-17-1320 61.8 64.3 2.5 4.72   Lynx 1 Lynx
OSK-W-17-1320 112.0 114.0 2.0 5.45   Lynx 1 Lynx
including 112.4 112.7 0.3 31.0  
OSK-W-17-1343 541.0 546.0 5.0 140 30.8 Lynx HW Lynx
including 544.7 545.6 0.9 704 100
OSK-W-17-1343-W2 507.3 511.7 4.4 34.1 29.5 Lynx HW Lynx
including 507.3 509.1 1.8 77.7 66.6
OSK-W-17-1343-W2 636.5 639.0 2.5 3.11   Lynx HW Lynx
OSK-W-17-1346 214.0 218.1 4.1 3.26   Lynx 1 + Lynx 2 Lynx
OSK-W-17-1350 386.7 388.7 2.0 6.31   Lynx 4 Lynx
OSK-W-17-1356 195.2 197.5 2.3 10.0   Lynx 1 Lynx
OSK-W-17-1364 301.0 307.1 6.1 15.0   Lynx 1 Lynx
including 303.8 305.1 1.3 35.0  

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: HW = Hanging Wall, VNCR = Crustiform Vein, TBD = To be determined, QTV: quartz tourmaline vein

Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-W-17-883 326 -60 396 453455 5434983 3600
OSK-W-17-888 333 -52 402 453367 5434941 3500
OSK-W-17-902 331 -50 468 453390 5434852 3475
OSK-W-17-909-W2 131 -55 1071 453683 5435677 4125
OSK-W-17-909-W3 131 -55 1066 453683 5435677 4125
OSK-W-17-923 137 -56 1062 453607 5435603 4025
OSK-W-17-945 149 -50 557 453374 5435444 3750
OSK-W-17-953 131 -48 762 453218 5435353 3575
OSK-W-17-998 330 -57 372 453313 5434909 3425
OSK-W-17-1006 136 -49 762 453281 5435348 3625
OSK-W-17-1015 137 -51 474 453232 5435294 3550
OSK-W-17-1019 140 -52 606 452660 5434917 2875
OSK-W-17-1024 330 -53 360 453295 5434947 3450
OSK-W-17-1027 134 -59 825 453437 5435481 3825
OSK-W-17-1028 326 -59 807 452860 5434814 3000
OSK-W-17-1040 327 -45 294 453295 5434948 3450
OSK-W-17-1043 133 -47 438 453284 5435344 3625
OSK-W-17-1044 333 -70 381 453477 5435045 3650
OSK-W-17-1059 136 -46 660 453284 5435344 3625
OSK-W-17-1067 132 -48 653 453339 5435400 3700
OSK-W-17-1072-W2 144 -57 1059 453612 5435535 4000
OSK-W-17-1072-W3 144 -57 1110 453612 5435535 4000
OSK-W-17-1085 339 -68 447 453460 5435020 3625
OSK-W-17-1099 335 -56 264 453143 5434935 3300
OSK-W-17-1104 142 -50 1059 453383 5435455 3775
OSK-W-17-1112 136 -54 636 453437 5435481 3825
OSK-W-17-1113 138 -50 480 453280 5435347 3625
OSK-W-17-1128 129 -53 1419 453272 5435392 3625
OSK-W-17-1131 337 -60 342 453329 5435010 3500
OSK-W-17-1166-W1 132 -59 1516 453621 5435639 4050
OSK-W-17-1166-W2 132 -59 1197 453621 5435639 4050
OSK-W-17-1166-W3 132 -59 1551 453621 5435639 4050
OSK-W-17-1168 329 -57 717 453464 5435090 3650
OSK-W-17-1169 129 -55 1437 453330 5435468 3725
OSK-W-17-1170