Osisko Intersects 4.96 g/t Au Over 13.5 Metres At Garrison

(Toronto, October 31, 2017).  Osisko Mining Inc. (OSK:TSX, “Osisko” or the “Corporation”) is pleased to announce new results from the ongoing drill program at its 100% owned Garrison gold project located in Garrison Township, Ontario.  Over 70,000 metres of new drilling have been conducted by Osisko on the Garrison Project to date.  A total of twenty-four new intercepts in eighteen holes are reported in this release, with significant assay results presented in the table below.

Significant new results include:  4.96 g/t Au over 13.5 metres in OSK-G17-414; 2.01 g/t Au over 21.5 metres and 3.10 g/t Au over 17.0 metres in OSK-G17-395; 3.60 g/t Au over 9.0 metres and 4.45 g/t Au over 5.5 metres in OSK-G17-423; 6.12 g/t Au over 6.0 metres and 10.6 g/t Au over 3.5 metres in OSK-G17-438; 2.13 g/t Au over 17.0 metres in OSK-G17-380; 8.14 g/t Au over 2.7 metres in OSK-G17-426; 7.69 g/t Au over 4.5 metres in OSK-G17-427; 1.34 g/t Au over 22.2 metres in OSK-G17-388; 1.24 g/t Au over 20.9 metres in OSK-G17-391.

The new results continue to confirm the extent of known mineralization in the Garrcon zone. The 2017 drill program is exploring the extensions of the mineralized zones within the Garrcon, Jonpol and 903 zones.  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-G17-336 6.0 7.0 1.0 37.1 30.0 Garrcon
OSK-G17-380 226.4 243.4 17.0 2.13   Garrcon
OSK-G17-388 56.1 78.3 22.2 1.34   Garrcon
OSK-G17-391 69.9 90.8 20.9 1.24   Garrcon
OSK-G17-395 25.50 47.0 21.5 2.01   Garrcon
Including 35.8 38.1 2.3 9.78  
  75.0 92.0 17.0 3.10   Garrcon
OSK-G17-401 35.0 54.8 19.8 1.16   Garrcon
OSK-G17-402 155.7 165.5 9.8 2.86   Garrcon
  256.0 266.0 10.0 1.72   Garrcon
OSK-G17-403 79.0 94.0 15.0 1.50   Garrcon
OSK-G17-405 91.6 98.5 6.9 4.28   Garrcon
OSK-G17-409 82.1 91.0 8.9 1.57   Garrcon
OSK-G17-410 55.0 63.8 8.8 1.16   Garrcon
OSK-G17-414 42.0 55.5 13.5 4.96   Garrcon
OSK-G17-419 35.8 45.8 10.0 1.44   Garrcon
  128.8 132.3 3.5 4.63   Garrcon
OSK-G17-423 50.0 59.0 9.0 3.60   Garrcon
  162.0 167.5 5.5 4.45   Garrcon
OSK-G17-426 48.5 50.5 2.0 6.30   Garrcon
  222.0 224.7 2.7 8.14   Garrcon
OSK-G17-427 210.5 215.0 4.5 7.69   Garrcon
Including 212.0 214.0 2.0 15.6  
  244.0 245.0 1.0 58.1 30.0 Garrcon
OSK-G17-438 113.0 119.0 6.0 6.12   Garrcon
Including 113.9 115.5 1.6 19.8  
  599.5 603.0 3.5 10.6   Garrcon

Notes:  True Widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.

Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-G17-336 337 -55 970 578439 5373928 1400W
OSK-G17-380 339 -47 465 578690 5373821 1200W
OSK-G17-388 281 -45 147 578592 5373861 1300W
OSK-G17-391 280 -60 216 578592 5373861 1300W
OSK-G17-395 280 -60 192 578583 5373886 1300W
OSK-G17-401 278 -61 186 578591 5373906 1275W
OSK-G17-402 340 -45 685 578714 5373764 1200W
OSK-G17-403 277 -45 162 578598 5373941 1250W
OSK-G17-405 280 -59 189 578598 5373941 1250W
OSK-G17-407 282 -45 90 578577 5373970 1250W
OSK-G17-409 282 -60 93 578577 5373970 1250W
OSK-G17-410 281 -45 101 578665 5373876 1200W
OSK-G17-414 281 -46 156 578701 5373894 1175W
OSK-G17-419 282 -45 144 578712 5373917 1175W
OSK-G17-423 280 -45 183 578685 5373950 1175W
OSK-G17-426 280 -60 244 578685 5373950 1175W
OSK-G17-427 270 -90 575 578691 5374046 1125W
OSK-G17-438 243 -90 777 578627 5373858 1250W

 

OSK-G17-388, 391, 395, 401, 403, 405, 407, 409 were drilled as part of a program to test the extension of a mineralized zone bulk sampled in prior work.  During a bulk sample program conducted in 2014 – 2015 by the previous property operator, testing focused on a N-NE trending mineralized corridor marked by zones of quartz-iron carbonate breccias. The mineralized corridor was found to dip shallowly to the east. New drilling involved a series of shallow west oriented holes designed to intersect the mineralized corridor at high angles to its strike.

The new results include:

  •  1.34 g/t Au over 22.2 metres in OSK-G17-388
  •  1.24 g/t Au over 20.9 metres in OSK-G17-391
  •  2.01 g/t Au over 21.5 metres and
  •  3.10 g/t Au over 17.0 metres in OSK-G17-395
  •  1.16 g/t Au over 19.8 metres in OSK-G17-401
  •  1.50 g/t Au over 15.0 metres in OSK-G17-403
  •  4.28 g/t Au over   6.9 metres in OSK-G17-405
  •  1.57 g/t Au over   8.9 metres in OSK-G17-409

Previous reported holes (see August 22, 2017 press release) from this program included OSK-G17-386 (1.20 g/t Au over 33.8 metres), OSK-G17-393 (1.12 g/t Au over 59.3 metres) and OSK-G17-398 (1.13 g/t Au over 22.8 metres).

OSK-G17-410, 414, 419, 423, 426 were designed to test the mineralized zone dipping below the Garrcon east bulk sample pit. The east bulk sample pit tested in 2014 – 2015 showed a parallel zone to the west bulk sample pit trending N-NE and comprised mainly of multiple parallel 1-10 cm quartz-iron carbonate veins hosted within metasediment. Similar to the west bulk sample pit, the mineralized corridor has a shallow east dip.

The new results include:

  •  1.16 g/t Au over   8.8 metres in OSK-G17-410
  •  4.96 g/t Au over 13.5 metres in OSK-G17-414
  •  1.44 g/t Au over 10.0 metres and
  •  4.63 g/t Au over   3.5 metres in OSK-G17-419
  •  3.60 g/t Au over   9.0 metres and
  •  4.45 g/t Au over   5.5 metres in OSK-G17-423
  •  6.30 g/t Au over   2.0 metres and
  •  8.14 g/t Au over   2.7 metres in OSK-G17-426

In both bulk sample pits the mineralization is closely associated with the N-NE trending quartz iron carbonate veins, breccias and fractures showing a strong iron carbonate alteration of the host rock.  Mineralization consists of pyrite concentrations up to 2% along with local visible gold.

OSK-G17-336 was drilled north west of the Garrcon west bulk sample pit intersecting a fracture zone within metasediment near the collar of the hole, with local visible gold returning 37.1 g/t Au over 1.0 metre.

OSK-G17-402, 380 were infill holes in the Garrcon Zone along section 1200W, drilling across the host metasediment.  OSK-G17-380 intersected 2.13 g/t Au over 17.0 metres within a zone of quartz-iron carbonate fracturing showing moderate hematite alteration. OSK-G17-402 intersected two significant mineralized zones including 2.86 g/t Au over 9.8 metres comprised of a broad zone of quartz-iron carbonate veins from 1-5 cm containing 1-2% pyrite, and local visible gold within an iron carbonate alteration halo.  A second interval returned 1.71 g/t Au over 10.0 metres within a fractured zone including minor quartz-iron carbonate and disseminated pyrite.

OSK-G17-427 intersected 7.69 g/t Au over 4.5 metres within a broad quartz-iron carbonate breccia within iron carbonate altered metasediment. This zone correlates with historical drill hole GAR-11-70, 25 metres north which intersected 5.65 g/t Au over 3.0 metres and GAR-12-159 located 40 metres south which intersected 8.39 g/t over 2.0 metres. A second mineralized zone within the hole returned 58.1 g/t Au over 1.0 metre within a zone containing quartz-iron carbonate fracturing and pervasive hematite altered metasediment.

OSK-G17-438 was drilled vertically between the two bulk sample pits at Garrcon. The hole intersected the down dip extension of the mineralized zone in the west bulk sample pit averaging 6.12 g/t Au over 6.0 metres. This interval is hosted within iron carbonate altered metasediment containing multiple 1 cm quartz-iron carbonate. A second intercept of the Garrcon deep zone returned 10.6 g/t Au over 3.5 metres.

OSK-G17-407 did not intersect significant mineralization.

Qualified Person
The scientific and technical content of this press release has been reviewed, prepared and approved by Mr. Greg Matheson, P.Geo. Senior Project Manager of the Garrison gold project, who is a “Qualified Person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“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 work 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 or through AAS finish at Bureau Veritas Mineral Laboratories 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 4g/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%. The trial production permit remains active.

Jonpol Zone
Jonpol is situated in the Munro Fault Zone, a west striking splay off the north side of the Destor-Porcupine Fault. Hosted in a shear zone tens of metres wide in altered mafic volcanic rocks, the deposit consists of four high grade gold mineralized zones (JP, JD, RP and East) over a strike length of 1.7 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 metre level with mining on six sublevels. The Jonpol infrastructure underwent reclamation in the late 1990s and was closed out in 2001, but the existing ramp and shaft are preserved.

About Osisko Mining Inc.
Osisko 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 (82,400 hectares), 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, the Buffonta past producing mine and the Gold Pike mine property. The Corporation also holds interests and options in a number of additional properties in northern Ontario.  Osisko continues to be well financed and has approximately $240 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 20.5 g/t Au Over 11.6 Metres At Lynx

Lynx 4 Extended 70 Metres to NE

(Toronto – October 30, 2017)  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 Urban Township, Abitibi, 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 24 intercepts in 20 drill holes focused on infill and expansion drilling in the Lynx deposit are presented below.

Highlights from the new results include: 20.5 g/t Au over 11.6 metres in OSK-W-17-1064; 20.8 g/t Au over 2.8 metres in OSK-W-17-934; 9.1 g/t Au over 6.2 metres in OSK-W-17-1166;  and 25.9 g/t Au over 2.1 metres in OSK-W-17-907. 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-17-877 177.7 181.0 3.3 5.02   Lynx HW Lynx
including 179.1 179.6 0.5 30.0  
OSK-W-17-907 961.9 964.0 2.1 25.9   Lynx
TBD
Lynx
including 962.3 963.0 0.7 59.5  
OSK-W-17-918 225.0 232.0 7.0 6.84   Lynx 1 Lynx
including 229.0 230.0 1.0 31.1  
  258.0 261.0 3.0 12.4   Lynx 2 Lynx
including 258.0 259.5 1.5 24.1  
OSK-W-17-929 901.5 903.7 2.2 6.58   Lynx 1 Lynx
including 902.1 903.0 0.9 14.7  
OSK-W-17-930 257.0 259.1 2.1 12.7   Lynx HW Lynx
including 257.0 257.9 0.9 27.0  
  324.0 326.4 2.4 16.1   Lynx 2 Lynx
OSK-W-17-934 476.2 479.0 2.8 20.8   Lynx 1 Lynx
including 476.2 477.2 1.0 57.0  
OSK-W-17-947 299.0 304.0 5.0 4.35   Lynx 1 Lynx
including 302.6 304.0 1.4 8.73  
OSK-W-17-957 205.0 207.0 2.0 8.73   Lynx 2 Lynx
including 205.0 206.0 1.0 17.1  
OSK-W-17-960 655.9 658.0 2.1 8.63   Lynx 4 Lynx
including 656.6 657.0 0.4 43.6  
OSK-W-17-984 103.5 107.0 3.5 12.1   Lynx 1 Lynx
including 103.5 103.8 0.3 88.1  
and 106.0 106.5 0.5 26.8  
OSK-W-17-993 394.0 398.1 4.1 10.1   Lynx 2 Lynx
including 396.9 398.1 1.2 25.3  
OSK-W-17-995 134.6 137.3 2.7 5.84   Lynx 1 Lynx
  352.9 355.0 2.1 3.75   Lynx 3 Lynx
OSK-W-17-1010 169.9 172.0 2.1 5.84   Lynx HW Lynx
including 170.3 171.0 0.7 16.8  
OSK-W-17-1052 115.9 120.0 4.1 7.65   Lynx 1 Lynx
including 118.2 119.4 1.2 20.8  
OSK-W-17-1034 202.3 206.0 3.7 6.29   VNCR Lynx
OSK-W-17-1036 345.8 350.6 4.8 3.73   VNCR Lynx
including 349.6 350.6 1.0 15.7  
  358.6 361.5 2.9 18.9   VNCR Lynx
including 359.6 360.5 0.9 58.1  
OSK-W-17-1064 344.9 356.5 11.6 20.5 15.5 Lynx 2 Lynx
including 345.7 346.7 1.0 159 100
OSK-W-17-1080 51.0 53.0 2.0 5.47   Lynx 2 Lynx
including 52.1 52.4 0.3 34.0  
OSK-W-17-1100 165.5 167.5 2.0 5.98   Lynx 3 Lynx
including 165.5 166.5 1.0 11.8  
OSK-W-17-1166 918.5 924.7 6.2 9.05   Lynx 4 Lynx
including 918.5 922.7 4.2 11.7  

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: HW = Hanging Wall;  TDB = To Be Determined;  VNCR = crustiform vein.
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-W-17-877 330 -50 360 453296 5434888 3400
OSK-W-17-907 134 -51 1317 453219 5435340 3575
OSK-W-17-918 335 -57 372 453387 5434953 3525
OSK-W-17-929 130 -58 1218 453871 5435782 4350
OSK-W-17-930 334 -51 372 453404 5434873 3500
OSK-W-17-934 144 -55 585 453406 5435465 3800
OSK-W-17-947 330 -58 444 453376 5434896 3475
OSK-W-17-957 327 -56 228 453329 5434973 3475
OSK-W-17-960 138 -54 960 453283 5435344 3625
OSK-W-17-984 325 -48 366 453301 5434978 3450
OSK-W-17-993 133 -51 483 453283 5435344 3625
OSK-W-17-995 327 -62 363 453224 5434910 3350
OSK-W-17-1010 330 -53 369 453313 5434908 3425
OSK-W-17-1034 330 -53 228 452978 5434914 3150
OSK-W-17-1036 139 -55 432 453231 5435294 3550
OSK-W-17-1052 328 -67 840 452999 5434855 3150
OSK-W-17-1064 330 -74 441 453460 5435020 3625
OSK-W-17-1080 330 -45 84 453165 5434979 3350
OSK-W-17-1100 149 -61 426 453395 5435252 3675
OSK-W-17-1166 132 -59 1182 453621 5435639 4050

 

OSK-W-17-877 intersected 5.02 g/t Au over 3.3 metres in the Lynx HW.  Mineralization is composed two quartz-veins in a chloritized gabbro with traces of disseminated pyrite and fuschite.

OSK-W-17-907 intersected 25.9 g/t Au over 2.1 metres. Mineralization is composed of 30% pyrite, 1% sphalerite and local visible gold in a millimetre scale pyrite stringer hosted in a large quartz-eye porphyric felsic intrusive.

OSK-W-17-918 intersected  Lynx 1 and Lynx 2:  6.84 g/t Au over 7.0 metres and 12.4 g/t Au over 3.0 metres.  In both cases, mineralization is hosted in sericitized fragmental felsic dike with traces of pyrite stringers or disseminated pyrite.

OSK-W-17-929 intersected with 6.58 g/t Au over 2.2 metres, possibly Lynx 1. Mineralization is composed of 2% pyrite within a pervasive silica flooding zone hosted in a slightly sericitized felsic dike. This interval confirms mineralization 200 metres down plunge and north-east of OSK-W-17-909 (11.8 g/t Au over 2.0 metres, previously reported September 18, 2017) and is 35 metres above the previous interval in this hole (18.9 g/t Au over 2.0 metres, previously reported October 3, 2017).

OSK-W-17-930 intersected Lynx HW and Lynx 2, respectively returning 12.69 g/t Au over 2.1 metres and 16.09 g/t Au over 2.4 metres.  Mineralization is composed of 3% disseminated pyrite, 1% pyrite stringers hosted and trace of quartz-tourmaline vein in a silicified and sericitized rhyolite.

OSK-W-17-934 intersected 20.8 g/t Au over 2.8 metres.  Mineralization is composed 3-5 % pyrite stringers with local visible gold hosted in a strongly sericitized fragmental felsic intrusive rock showing strong pervasive silica flooding.

 OSK-W-17-947 intersected 4.35 g/t Au over 5.0 metres.  Mineralization is composed of crustiform veins within a silicified fragmental rhyolite with up to 10% disseminated pyrite.

OSK-W-17-957 intersected 8.73 g/t Au over 1.4 metres.  Mineralization is composed of 2% pyrite in a sericitized and slightly silicified fragmental felsic dike.

OSK-W-17-960 intersected 8.63g/t Au over 2.1 metres in Lynx 4. Mineralization is composed of 1% pyrite stringers hosted in a silica-rich zone hosted in a sericitized felsic dike.

OSK-W-17-984 intersected  Lynx 1 and returned 12.1 g/t Au over 3.5 metres and 26.8 g/t Au over 0.5 metres. Mineralization is composed of 3% pyrite clusters, 2% disseminated pyrite in a silicified and moderately sericitized rhyolite. High grades values correspond with crustiform veins with local visible gold. 

OSK-W-17-993 intersected Lynx 2 returning 10.1g/t Au over 4.1 metres. Mineralization is composed of 1% pyrite stringers in silica-sericite veins over 30 centimetres and 2% pyritized fragments within silicified felsic volcanic rock.

OSK-W-17-995 intersected two intervals: 5.8 g/t Au over 2.7 metres and 3.8 g/t Au over 2.1 metres.  The first interval related to Lynx 1 corresponds with 2-3% pyrite stringers at a contact between a weakly sericitized-silicified large quartz-eye felsic intrusive and a fuschitized gabbro and two quartz-carbonate veins, with trace pyrite and local crustiform texture.  The second interval corresponds to a chloritized and sericitized gabbro with 1% fuschite and 2% pyrite stringers.

OSK-W-17-1010 intersected 5.8 g/t Au over 2.1 metres.  Mineralization is composed of up to 15% pyrite stringers, 5% pyrites clusters and disseminated pyrite.

OSK-W-17-1034 intersected 6.29 g/t Au over 3.7 metres. Mineralization includes up 2% pyrite-tourmaline stringers hosted in felsic dyke with 30% crustiform veining.

OSK-W-17-1036 intersected two intervals related to crustiform veins: 3.73 g/t Au over 4.8 metres and 18.9 g/t Au over 2.9 metres.  Mineralization is composed of quartz tourmaline or quartz crustiform veins with up to 8% pyrite hosted in a chloritized and fuschitized gabbro.

OSK-W-17-1052 intersected 7.7 g/t Au over 4.1 metres.  Mineralization is composed of up to 7% disseminated pyrite, 2% disseminated chalcopyrite within a gabbro showing locally pervasive silica flooding, and fuchsite with 30% quartz-carbonate veining. Possible up plunge extension of Lynx 1, 170 metres south-west of OSK-W-17-846 (113 g/t au over 2.0 metres, previously reported July 12, 2017).

OSK-W-17-1064 intersected 20.5 g/t Au over 11.6 metres.  Mineralization includes trace visible gold, 5% disseminated pyrite, 2% pyrite stringers, 1-2% sphalerite quartz-tourmaline veining hosted in a strongly silicified gabbroic unit.

OSK-W-17-1080 intersected 5.5 g/t Au over 2.0 metres in a smoky quartz vein containing up to 8% disseminated pyrite hosted in a strongly silicified fragmental felsic unit.  Extends Corridor 25 metres south-west of OSK-W-16-761.

OSK-W-17-1100 intersected 6.0 g/t Au over 2.0 metres in Lynx 3 composed of 5% pyrite following a quartz-tourmaline vein in a sericitized contact, between gabbro and a fragmental felsic intrusive.

OSK-W-17-1166 intersected 9.1 g/t Au over 6.2 metres.  Mineralization correlates to Lynx 4 and composed of 4% pyrite tourmaline stringers, 1% disseminated and cluster pyrite, quartz tourmaline veins.  It extends the zone 70 metres north east of OSK-W-17-923 (4.33 g/t Au over 3.0 metres, previously reported October 12, 2017).

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 $240 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 Completes First Blast At Windfall Exploration Ramp

(Toronto, October 27, 2017) Osisko Mining Inc. (OSK:TSX “Osisko” or the “Corporation”) is pleased to announce it has completed its first underground blast on schedule at the exploration ramp at its 100% owned Windfall Lake gold project located in Urban Township, Abitibi, Québec. 

Dewatering of the exploration ramp was completed at the end of August. Rehabilitation is on-going and is planned to be completed in the coming month. Underground infrastructure including construction of a powder magazine and various underground excavations is scheduled to be completed in December. The exploration ramp is expected to advance at a rate of approximately 200 metres per month towards the mineralized zones. Underground work, including bulk sampling (for metallurgical testing and grade confirmation) and underground exploration drilling, will commence in Q1 2018.

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 $250 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 underground blasts scheduled at the exploration ramp at the Windfall Lake gold project; ongoing rehabilitation efforts; the timing to complete rehabilitation efforts, if at all; the timing and ability, if at all, to complete the construction of underground infrastructure, including construction of a powder magazine and underground excavations; the expected advancement rate of the exploration ramp; the timing and ability to commence underground work (including bulk sampling and underground exploration drilling); the Windfall Lake gold deposit being one of the highest grade resource-stage gold projects in Canada;  potential mineralization, including mineralization identified near the surface and at depth; 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 and underground work; property interests in the Windfall Lake gold project; 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 39.4 g/t Au Over 2.4 Metres At Windfall

(Toronto, October 25, 2017)  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 Urban Township, Abitibi, 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 18 intercepts in 11 infill holes (at 15 metre spacings) between section 2150E – 2450E, and 4 infill/expansion holes in Zone 27 of the Windfall deposit are presented below.

Highlights from the new results include: 39.4 g/t Au over 2.4 metres in OSK-W-17-1186; 18.8 g/t Au over 4.2 metres in OSK-W-17-1154; 25.7 g/t Au over 2.6 metres in OSK-W-17-903-W1;  and 7.90 g/t Au over 8.0 metres. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Osisko is performing definition drilling in Zone 27.  The definition program is focused on infilling a 200 metre wide by 200 metre deep area of Zone 27 with a 15 metres drill spacing.  The area is between section 2150E and 2350E.

Hole Number From
(m)
To
(m)
Interval
(m)
Au (g/t)
uncut
Au (g/t)
cut to
100 g/t
Zone Corridor
OSK-W-17-864 516.0 524.0 8.0 7.90   Z27 Z27
OSK-W-17-903-W1 577.6 580.2 2.6 25.7   Z27 FW Z27
including 577.6 578.5 0.9 73.7  
OSK-W-17-1009 108.0 110.7 2.7 5.73   Z27 (15m infill) Z27
including 109.0 110.0 1.0 13.7  
OSK-W-17-1018 10.0 12.0 2.0 3.93   Z27 Z27
OSK-W-17-1023 134.4 138.0 3.6 4.00   Z27 (15m infill) Z27
including 134.4 135.2 0.8 13.1  
OSK-W-17-1038 97.4 99.7 2.3 16.4   Z27 (15m infill) Z27
OSK-W-17-1050 76.5 80.0 3.5 6.55   Z27 (15m infill) Z27
OSK-W-17-1103 79.8 82.0 2.2 15.4   Z27 (15m infill) Z27
OSK-W-17-1106 19.0 21.2 2.2 3.02   Z27 (15m infill) Z27
including 20.9 21.2 0.3 18.6  
OSK-W-17-1122 63.0 65.2 2.2 7.05   Z27 (15m infill) Z27
OSK-W-17-1129 206.8 209.0 2.2 8.20   Z27 (15m infill) Z27
OSK-W-17-1154 91.0 95.2 4.2 18.8   Z27 (15m infill) Z27
including 92.0 93.0 1.0 44.1  
OSK-W-17-1164 132.0 139.8 7.8 7.12   Z27 (15m infill) Z27
including 139.3 139.8 0.5 64.9  
OSK-W-17-1180 71.0 74.0 3.0 5.04   Z27 (15m infill) Z27
  80.0 85.0 5.0 18.0   Z27 (15m infill) Z27
including 80.9 81.9 1.0 49.6  
  142.8 146.0 3.2 3.98   Z27 (15m infill) Z27
  156.5 158.7 2.2 3.47   Z27 (15m infill) Z27
OSK-W-17-1186 522.0 524.4 2.4 39.4   Z27 Z27
including 523.0 524.0 1.0 87.8  

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: FW = Foot Wall
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-W-17-864 330 -53 813 452467 5434581 2525
OSK-W-17-903-W1 329 -56 657 452539 5434692 2650
OSK-W-17-1009 147 -49 183 452107 5434809 2325
OSK-W-17-1018 333 -47 300 452247 5434865 2475
OSK-W-17-1023 145 -48 228 452033 5434796 2275
OSK-W-17-1038 147 -49 120 452067 5434773 2275
OSK-W-17-1050 148 -49 106 452053 5434749 2250
OSK-W-17-1103 148 -49 111 452016 5434722 2200
OSK-W-17-1106 330 -50 342 452152 5434730 2325
OSK-W-17-1122 150 -47 114 452063 5434736 2250
OSK-W-17-1129 325 -49 249 452213 5434606 2325
OSK-W-17-1154 149 -49 174 452020 5434762 2250
OSK-W-17-1164 143 -58 336 451960 5434752 2175
OSK-W-17-1180 322 -45 189 452066 5434618 2175
OSK-W-17-1186 331 -54 984 452419 5434554 2475

 

OSK-W-17-864 intersected 7.9 g/t Au over 8.0 metres. Mineralization is composed of up to 20% pyrite stringers within strong pervasive silica alteration. The andesite host is also sericite and fuchsite altered. Traces of chalcopyrite are observed along the interval.

OSK-W-17-903-W1 intersected 25.7 g/t Au over 2.6 metres in the Zone 27 Footwall. The mineralization is hosted in a strongly sericitized andesite, cut by the Red Dog intrusion, and composed of 3% pyrite stringers. The interval is 30 metre south-west of OSK-W-17-903 (10.7 g/t Au over 2.0 metres previously reported September 20, 2017).

OSK-W-17-1009 intersected 5.73 g/t Au over 2.7 metres. Mineralisation is in a porphyritic felsic intrusion and composed of massive pyrite stringers and pyrite-tourmaline veins. The intrusion is strongly sericitized and silicified.

OSK-W-17-1018 intersected 3.93 g/t Au over 2.0 metres. Mineralisation is composed of 6% semi-massive pyrite and 8% pyrite stringers within a strong silica and sericite altered rhyolite. The interval is 45 metres north-west of the main Zone 27.

OSK-W-17-1023 intersected 4.00 g/t Au over 3.6 metres. Mineralization is at the contact between the felsic intrusion and the rhyolite. Up to 4% pyrite stringers and few quartz-tourmaline veins are within a strong silica and sericite alteration envelope.

OSK-W-17-1038 intersected 16.4 g/t Au over 2.3 metres. Mineralization is composed of up to 5% pyrite stringers in a silica altered felsic porphyritic intrusion.

OSK-W-17-1050 intersected 6.55 g/t Au over 3.5 metres. Mineralization is composed of up to 4% pyrite stringers, 5% pyrite clusters and 1% quartz-tourmaline veins within a strongly sericitized and silicified rhyolite.

OSK-W-17-1103 intersected 15.4 g/t Au over 2.2 metres. Mineralization is composed of 10% pyrite-silica flooding at the contact between the andesite and the felsic porphyritic intrusion.

OSK-W-17-1106 intersected 3.02 g/t Au over 2.2 metres. Mineralisation is composed of trace disseminated pyrite and trace pyrite stringers hosted in a strongly sericitized rhyolite.

OSK-W-17-1122 intersected 7.05 g/t Au over 2.2 metres. Mineralization is composed of up to 10% pyrite stringers hosted in a strongly silicified and sericitized felsic dike.

OSK-W-17-1129 intersected 8.2 g/t Au over 2.2 metres. Mineralization is composed of up to 30% pyrite-silica flooding within a strongly sericitized rhyolite.

OSK-W-17-1154 intersected 18.8 g/t Au over 4.2 metres. Mineralization is composed of 10% semi-massive pyrite and 10% pyrite stringers within a strongly silicified and sericitized felsic intrusion.

OSK-W-17-1164 intersected 7.12 g/t Au over 7.8 metres. Mineralization is composed of trace pyrite stringers and trace pyrite clusters hosted in a sericite altered large quarts eyes, porphyritic felsic dike.

OSK-W-17-1080 intersected four intervals: 5.04 g/t Au over 3.0 metres, 18.0 g/t Au over 5.0 metres, 3.98 g/t Au over 3.2 metres and 3.47 g/t Au over 2.2 metres. The mineralization is composed of up to 15% pyrite stringers, 5% pyrites clusters and disseminated pyrite. Mineralization correlates with felsic intrusions, fragmental or porphyritic textured, hosted in strongly sericitized and silicified rhyolite or andesite.

OSK-W-17-1186 intersected 39.4 g/t Au over 2.4 metres. Mineralization is composed of 5% pyrite stringers and 5-10% disseminated pyrite within a strongly sericitized and silicified andesite.

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 $250 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 31.4 g/t Au Over 6.0 Metres At Windfall

Drake Extended 100 Metres to NE

Caribou Extension Confirmed to NE

(Toronto, October 18, 2017)  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 Urban Township, Abitibi, 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 36 intercepts in 24 drill holes focused on infill and expansion drilling in the Underdog, Caribou, and Mallard corridors of the Windfall deposit are presented below.

Highlights from the new results include: 250 g/t Au over 2.0 metres and 73.6 g/t over 2.0 metres in OSK-W-17-903 in the Underdog corridor; 108 g/t Au over 2.3 metres in OSK-W-17-1179; 31.4 g/t Au over 6.0 metres in OSK-W-17-820 in the Caribou corridor; and 36.6 g/t Au over 3.4 metres in OSK-W-17-867 in the Wolf Zone footwall.  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-EAG-13-503 342.5 344.9 2.4 8.96   New Underdog
including 343.5 344.9 1.4 13.3  
OSK-OBM-16-601 795.0 797.8 2.8 5.26   FW4 Underdog
including 797.1 797.8 0.7 20.7  
OSK-OBM-16-664 649.0 652.0 3.0 12.8   FW3U HW Underdog
OSK-W-17-664-W1 754.0 756.4 2.4 4.89   FW3U Underdog
including 754.9 755.8 0.9 12.8  
OSK-W-17-820 558.5 564.5 6.0 31.4 25.4 CS1 Caribou
including 561.0 563.0 2.0 83.0 65.0
OSK-W-17-854-W1 489.6 492.0 2.4 7.97   Wolf FW Caribou
including 491.3 492.0 0.7 15.1  
  498.0 501.0 3.0 5.18   Wolf FW Caribou
OSK-W-17-855-W2 759.9 762.0 2.1 11.1   FW1 Underdog
including 759.9 761.0 1.1 20.8  
  861.0 863.0 2.0 8.88   FW2 Underdog
including 862.0 863.0 1.0 17.4  
OSK-W-17-862-W2 640.0 643.0 3.0 13.4   Wolf FW Caribou
including 642.0 643.0 1.0 38.9  
OSK-W-17-867 714.1 717.5 3.4 36.6 29.9 Wolf FW Caribou
including 715.0 716.0 1.0 123 100
OSK-W-17-871 23.2 25.8 2.6 5.39   TBD  
including 24.1 25.0 0.9 15.2  
  269.0 271.4 2.4 6.21   Caribou Caribou
OSK-W-17-903 668.5 670.5 2.0 250 50.1 Vein Underdog
including 668.5 669.5 1.0 501 100    
  778.0 780.0 2.0 73.6 40.2 FW3U Underdog
including 779.2 780.0 0.8 184 100
OSK-W-17-913 533.8 536.5 2.7 5.09   TBD Caribou
including 533.8 535.0 1.2 11.1  
  791.0 793.0 2.0 13.5   Wolf HW Caribou
including 791.0 792.0 1.0 26.2  
OSK-W-17-926 123.8 126.3 2.5 5.18   Mallard Mallard
OSK-W-17-937 782.0 784.4 2.4 8.09   Wolf 2 Caribou
including 783.0 783.8 0.8 22.4  
OSK-W-17-969 210.6 213.0 2.4 10.1   Mallard Mallard
including 210.6 211.0 0.4 53.0  
OSK-W-17-996 359.0 361.2 2.2 9.62   Mallard FW Mallard
including 359.7 360.4 0.7 24.1  
OSK-W-17-999 91.5 94.0 2.5 5.18   TBD NEW Caribou
including 91.5 93.0 1.5 8.54  
  400.7 403.9 3.2 3.68   Caribou ext. Caribou
  432.9 436.4 3.5 5.79   Caribou ext. Caribou
  459.4 462.0 2.6 5.19   Caribou ext. Caribou
including 460.0 461.0 1.0 10.4  
OSK-W-17-1031 182.0 184.0 2.0 3.14   Drake Mallard
including 182.3 182.6 0.3 18.7  
OSK-W-17-1051 303.0 305.1 2.1 7.85   TBD  
  846.0 848.0 2.0 27.8   FW3 Underdog
including 847.0 848.0 1.0 53.8  
OSK-W-17-1066 412.0 415.4 3.4 4.72   CS1 HW Caribou
  458.6 460.9 2.3 4.48   CS1 Caribou
  514.0 517.0 3.0 7.98   CN1 Caribou
including 515.6 516.1 0.5 43.1  
OSK-W-17-1079 597.0 599.3 2.3 108 17.5 CN1 FW Caribou
including 597.6 598.0 0.4 618 100
OSK-W-17-1119 527.4 529.5 2.1 10.7   CN1 Caribou
including 528.3 528.7 0.4 44.4  
  534.3 540.4 6.1 3.08   CN1 Caribou
including 539.2 540.4 1.2 9.48  
OSK-W-17-1147-W1 1129.0 1131.0 2.0 7.52   Caribou ext. Caribou
including 1130.0 1130.5 0.5 29.2  
OSK-W-17-1189 718.5 723.7 5.2 6.58   Caribou Caribou
including 718.5 719.0 0.5 49.8  

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: FW = Foot Wall; HW = Hanging Wall; TBD = To Be Determine.
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-EAG-13-503 330 -56 918 451969 5434525 2075
OSK-OBM-16-601 332 -51 801 452476 5434677 2600
OSK-OBM-16-664 329 -55 810 452396 5434618 2500
OSK-W-17-664-W1 329 -55 996 452394 5434619 2500
OSK-W-17-820 332 -66 1106 452670 5434484 2675
OSK-W-17-854-W1 331 -53 844 452485 5434592 2550
OSK-W-17-855-W2 334 -64 1197 452309 5434384 2300
OSK-W-17-862-W2 332 -55 759 452683 5434577 2725
OSK-W-17-867 315 -50 1029 452800 5434550 2825
OSK-W-17-871 328 -54 533 452402 5434623 2500
OSK-W-17-903 329 -56 801 452539 5434692 2650
OSK-W-17-913 334 -52 954 452878 5434419 2825
OSK-W-17-926 329 -54 216 451981 5434828 2225
OSK-W-17-937 333 -57 935 452897 5434430 2850
OSK-W-17-969 328 -48 324 452200 5434867 2425
OSK-W-17-996 328 -56 393 452270 5434844 2500
OSK-W-17-999 330 -61 516 452861 5434813 3000
OSK-W-17-1031 336 -62 390 452296 5434867 2525
OSK-W-17-1051 138 -68 1248 452313 5435323 2775
OSK-W-17-1066 332 -56 585 452488 5434436 2475
OSK-W-17-1079 332 -58 615 452541 5434452 2550
OSK-W-17-1119 331 -55 609 452541 5434452 2550
OSK-W-17-1147-W1 335 -52 1212 453241 5434381 3125
OSK-W-17-1189 335 -47 1005 452945 5434561 2950

 

OSK-EAG-13-503 intersected 8.96 g/t Au over 2.4 metres (including 13.3 g/t Au over 1.4 metres). Mineralization is composed of semi-massive pyrite stringers and up to 3% disseminated pyrite within a sericitized felsic intrusion. The interval occurs directly under the Red Dog intrusion on section 2075E.

OSK-OBM-16-601 intersected 5.26 g/t Au over 2.8 metres (including 20.7 g/t Au over 0.7 metres). Mineralization is composed of 1% disseminated pyrite within a strongly chloritized andesite. The interval is 60 metres north-west of and parallel to FW3 and aligns with FW4 projections.

OSK-OBM-16-664 intersected 12.8 g/t Au over 3.0 metres in FW3U HW. Mineralization is composed of trace pyrite stringers and small quartz-tourmaline-pyrite veins hosted in rhyolite.

OSK-W-17-664-W1 intersected 4.89 g/t Au over 2.4 metres (including 12.8 g/t Au over 0.9 metres). Mineralization is composed of 2% pyrite stringers within a strongly sericitized andesite.

OSK-W-17-820 intersected 31.4 g/t Au over 6.0 metres uncut (including 83.0 g/t Au over 2.0 metres). Mineralization occurs with strong silica, chlorite and fuchsite alteration in a sheared andesite with up to 25% pyrite clusters and 15% interstitial sphalerite. The interval correlates to CS1 Zone.

OSK-W-17-854-W1 intersected two intervals within the Wolf FW: 7.97 g/t Au over 2.4 metres (including 15.1 g/t Au over 0.7 metres) and 5.18 g/t Au over 3.0 metres. Both intervals occur at the sericite, chlorite and silica altered contact between the felsic porphyritic intrusion and andesite. Mineralization is composed of up to 20% disseminated pyrite, up to 3% pyrite stringers and local quartz-tourmaline ptygmatic veins.

OSK-W-17-855-W2 intersected two intervals: 11.1 g/t Au over 2.1 metres (including 20.8 g/t Au over 1.1 metres) in FW1 and 8.88 g/t over 2.0 metres (including 17.4 g/t Au over 1.0 metre) in FW2. Both intervals contain up to 1% disseminated pyrite and pyrite stringers within and at the contacts along felsic porphyritic dikes.

OSK-W-17-862-W2 intersected 13.4 g/t Au over 3.0 metres (including 38.9 g/t Au over 1.0 metre) in the Wolf Footwall. The mineralization is composed of semi-massive pyrite within a strongly sericitized andesite.

OSK-W-17-867 intersected 36.6 g/t Au over 3.4 metres uncut, (including 123 g/t Au over 1.0 metre) in the Wolf footwall. Trace pyrite mineralization is hosted in weak sericite alteration at the contact between a felsic porphyritic dike and andesite. Two quartz-carbonate veins occur along the contact.

OSK-W-17-871. Intersected a new zone returning 5.39 g/t Au over 2.6 metres (including 15.2 g/t Au over 0.9 metres). The interval is 70 metres south-east of the main Caribou Corridor. Mineralization is composed of disseminated pyrite at the contact between a felsic porphyritic dike and a sericitized andesite. A second intersection returned 6.21 g/t Au over 2.4 metres in the main Caribou Zone. Mineralization is composed of up to 7% pyrite stringers and 3% disseminated pyrite hosted in a strongly sericitized rhyolite.

OSK-W-17-903 intersected two intervals. The first interval returned 250 g/t Au over 2.0 metres uncut (including 501 g/t Au over 1.0 metres) in a tension quartz vein within the Red Dog intrusion. The second interval returned 73.6 g/t Au over 2.0 metres uncut (including 184 g/t Au over 0.8 metres) in FW3.  Mineralization is composed of up to 2% pyrite stringers and disseminated pyrite and local quartz-carbonate veins within a chloritized andesite.

OSK-W-17-913 intersected two intervals: 5.09 g/t Au over 2.7 metres (including 11.1 g/t Au over 1.2 metres) and 13.5 g/t Au over 2.0 metres (including 26.2 g/t Au over 1.0 metre). The first interval is composed of disseminated pyrite at the contact between the rhyolite and the andesite, 55 metres south-east of the main Caribou Corridor. The second interval is within the Wolf hanging wall and is composed of disseminated pyrite and pyrite stringers within a large quartz eyes porphyritic felsic intrusion.

OSK-W-17-926 intersected 5.18 g/t Au over 2.5 metres in Mallard. Mineralization is in a strongly sericitized andesite containing 1% disseminated pyrite, pyrite stringers and local quartz-tourmaline veins.  Mineralization follows a porphyritic felsic dike contact and extends the Mallard Zone 35 metres north-east from OSK-W-17-919 (4.32 g/t Au over 2.5 metres previously reported August 14, 2017).

OSK-W-17-937 intersected 8.09 g/t Au over 2.4 metres (including 22.4 g/t Au over 0.8 metres). Mineralization occurs at the contact between a felsic intrusion and a sericitized rhyolite, with 15% pyrite stringers. The interval correlates to Wolf 2.

OSK-W-17-969 intersected Mallard returning 10.1 g/t Au over 2.4 metres (including 53.0 g/t Au over 0.4 metres).  Mineralization is within a sericitized andesite as 2% pyrite and up to 55% pyrite stringers. Interval is located 60 metres above the OSK-W-17-977 (12.0 g/t Au over 2.2 metres, previously reported September 20, 2017).

OSK-W-17-996 intersected 9.62 g/t Au over 2.2 metres (including 24.1 g/t Au over 0.7 metres). The interval correlates to the Mallard footwall and is composed of 4% disseminated pyrite, 5% crustiform veins and 1% ptygmatic tourmaline veins, occurring along the Red Dog contact within a moderate sericite altered andesite. It extends the Mallard zone 60 metres northeast of OSK-W-17-977 (12.0 g/t Au over 2.2 metres, previously reported September 20, 2017).

OSK-W-17-999 intersected four interval:  the first returned 5.18 g/t Au over 2.5 metres (including 8.54 g/t Au over 1.5 metres) 100 metres south-east of the main Caribou Corridor, mineralization within a fragmental felsic intrusion, with disseminated pyrite correlating with strong sericite alteration. The three other intervals are in the north-east extension of the Caribou Corridor, 50 metres north-east of OBM-16-580 and OBM-16-701 (4.30 g/t Au over 5.4 metres and 4.82 g/t Au over 7.0 metres, respectively reported February 18 and August 25, 2016). The three intervals returned 3.68 g/t Au over 3.2 metres; 5.79 g/t Au over 3.5 metres; and 5.19 g/t Au over 2.6 metres (including 10.4 g/t Au over 1.0 metre). Mineralization occurs in a strongly sericitized and silicified andesite with up to 40% pyrite stringers.

OSK-W-17-1031 intersected 3.14 g/t Au over 2.0 metres (including 18.7 g/t Au over 0.3 metres). Mineralization includes 4% pyrite stringers and 1% disseminated pyrite within a strongly silicified and sericitized andesite. This interval extends the Drake Zone 100 metres northeast of OSK-W-17-969 (7.39 g/t Au over 3.3 metres, previously reported August 24, 2017).

OSK-W-17-1051 intersected a new mineralized contact between a felsic intrusion and the andesite, returning 7.85 g/t Au over 2.1 metres. The interval is 160 metres north-west of the Mallard Corridor, along strike of the F-17 and F-51 zones.  OSK-W-17-1051 also intersected FW3 returning 27.8 g/t Au over 2.0 metres (including 53.8 g/t Au over 1.0 metre). Local visible gold is found with pervasive silica alteration and within a large quartz eyes porphyritic dike, as 8% disseminated pyrite and 4% pyrite-tourmaline stringers.

OSK-W-17-1066 intersected three intervals: 4.72 g/t Au over 3.4 metres; 4.48 g/t Au over 2.3 metres; and 7.98 g/t Au over 3.0 metres (including 43.1 g/t Au over 0.5 metres). The first two zones correlate to CS1 with up to 20% pyrite stringers in a chloritized rhyolite and strongly sericitized andesite. The third interval correlates to CN1 and includes up to 10% pyrite clusters along the contact between a sericitized andesite and a large quartz eyes porphyritic dike.

OSK-W-17-1079 intersected 108 g/t Au over 2.3 metres uncut (including 618 g/t Au over 0.4 metres). Mineralization is included in a sericitized gabbro with local visible gold and 1% pyrite. The interval correlates to CN1, just above the Red Dog contact.

OSK-W-17-1119 intersected two intervals in CN1: 10.7 g/t Au over 2.1 metres (including 44.4 g/t Au over 0.4 metres) and 3.08 g/t Au over 6.1 metres (including 9.48 g/t Au over 1.2 metres). Mineralization is composed of up to 20% pyrite stringers and 5-10% disseminated pyrite within a strongly sericitized andesite.

OSK-W-17-1147-W1 intersected 7.52 g/t Au over 2.0 metres (including 29.2 g/t Au over 0.5 metres) at the contact between an andesite and a porphyritic felsic dike with up to 5% disseminated pyrite and 1% pyrite stringers. The interval is in the north-east extension of the Caribou Corridor.

OSK-W-17-1189 intersected 6.58 g/t Au over 5.2 metres (including 49.8 g/t Au over 0.5 metres). Mineralization is composed of 5% disseminated pyrite, 2% pyrite clusters, in a strongly sericitized andesite in contact with a felsic intrusion. The interval is in the north-east extension of the Caribou Corridor.

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 $250 million in cash and investments (pro-forma recently announced financing).

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 61.8 g/t Au Over 2.5 Metres At Lynx

Lynx 4 Extended 235 Metres to NE

(Toronto, October 12, 2017)  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 Urban Township, Abitibi, 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 19 intercepts in 11 drill holes focused on infill and expansion drilling in the Lynx deposit are presented below.

Highlights from the new results include: 61.8 g/t Au over 2.5 metres in OSK-W-17-953; 21.2 g/t Au over 4.3 metres in OSK-W-17-1169; 16.9 g/t Au over 4.0 metres in OSK-W-17-1190; and 29.8 g/t Au over 2.0 metres in OSK-W-17-881. 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-17-856 270.4 276.0 5.6 5.03   Lynx 2 Lynx
including 270.4 271.0 0.6 13.1  
including 274.0 275.0 1.0 15.2  
OSK-W-17-881 360.5 364.7 4.2 6.54   Lynx 2 FW Lynx
including 362.0 363.4 1.4 15.1  
  384.0 386.0 2.0 29.8   Lynx 2 FW Lynx
including 385.0 386.0 1.0 59.4  
OSK-W-17-923 928.2 931.2 3.0 4.33   Lynx 4 corridor Lynx
OSK-W-17-953 433.0 435.5 2.5 61.8 33.3 Lynx 2 Lynx
including 433.7 434.5 0.8 189 100
OSK-W-17-998 325.0 329.5 4.5 4.78   VNCR Lynx
OSK-W-17-1003 131.1 133.7 2.6 5.18   Lynx 1 Lynx
including 131.1 131.9 0.8 16.8  
  213.1 215.1 2.0 19.5   Lynx 2 Lynx
including 213.1 213.9 0.8 46.3  
OSK-W-17-1121 335.4 337.7 2.3 19.0   VNCR Lynx
including 336.2 336.9 0.7 58.8  
  421.9 424.0 2.1 3.34   VNCR Lynx
  435.0 437.7 2.7 8.62   VNCR Lynx
including 436.0 437.7 1.7 13.7  
OSK-W-17-1123 130.0 132.1 2.1 11.6   Lynx 2 Lynx
including 130.9 131.3 0.4 47.5  
OSK-W-17-1128 423.5 429.0 5.5 3.85   Lynx 3 Lynx
  459.0 461.0 2.0 5.00   Lynx 2 Lynx
  1203.9 1206.2 2.3 14.0   Lynx 6 Lynx
including 1205.0 1206.2 1.2 25.7  
OSK-W-17-1169 1037.7 1040.1 2.4 7.14   Lynx 4 Lynx
including 1039.7 1040.1 0.4 21.8  
  1104.2 1108.5 4.3 21.2   Lynx 4 Lynx
including 1107.5 1108.5 1.0 42.4  
OSK-W-17-1190 538.6 541.1 2.5 11.0   Lynx 4 corridor Lynx
  548.0 552.0 4.0 16.9   Lynx 4 corridor Lynx
including 549.0 549.7 0.7 57.2  

Notes:
1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
2. Definitions: FW = Foot Wall; VNCR = crustiform vein.

Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-W-17-856 331 -52 291 453292 5434909 3425
OSK-W-17-881 136 -48 867 453217 5435342 3575
OSK-W-17-923 137 -56 1062 453607 5435603 4025
OSK-W-17-953 131 -48 762 453218 5435353 3575
OSK-W-17-998 330 -57 372 453313 5434909 3425
OSK-W-17-1003 329 -59 366 453223 5434910 3350
OSK-W-17-1121 335 -64 465 453436 5434958 3550
OSK-W-17-1123 336 -46 345 453313 5434972 3475
OSK-W-17-1128 129 -53 1419 453272 5435392 3650
OSK-W-17-1169 129 -55 1437 453330 5435468 3725
OSK-W-17-1190 151 -49 1179 452905 5435152 3200

 

OSK-W-17-856 intersected Lynx 2 returning 5.03 g/t Au over 5.6 metres (including 13.1 g/t Au over 0.6 metres and 15.2 g/t Au over 1.0 metre). Mineralization includes up to 18% pyrite, 5% quartz-carbonate veins and ptygmatic tourmaline veins related to rich silica bands.

OSK-W-17-881 intersected two intervals: 6.54 g/t Au over 4.2 metres (including 15.1 g/t Au over 1.4 metres) and 29.8 g/t Au over 2.0 metres (including 59.4 g/t Au over 1.0 metre). Both intervals are related to Lynx 2 Footwall at the contacts between a rhyolite and a gabbro. Mineralization is composed of up to 1% pyrite stringers and quartz-tourmaline veins within sericite and fuchsite alteration.

OSK-W-17-923 intersected 4.33 g/t Au over 3.0 metres in a strongly sericite and fuchsite altered gabbro. The mineralization is composed of up to 2% pyrite, 2% pyrite stringers and small crustiform veins. The interval correlates to the Lynx 4 corridor, extending the zone235 metres north-east of OSK-W-17-836 (116 g/t Au over 2.4 metres, uncut, previously reported May 23, 2017).

OSK-W-17-953 intersected Lynx 2 returning 61.8 g/t Au over 2.5 metres, uncut, (including 189 g/t Au over 0.8 metres) or 33.3 g/t Au over 2.5 metres cut. The mineralization is within a strongly silicified, sericitized and fuchsitized gabbro with 3% pyrite stringers, 2% disseminated pyrite and small crustiform veins.

OSK-W-17-998 intersected a crustiform vein returning 4.78 g/t Au over 4.5 metres between the Lynx 2 and Lynx 3 Zones. The vein contains up to 7% disseminated pyrite, 3% tourmaline and ptygmatic veins.

OSK-W-17-1003 intersected two intervals: 5.18 g/t Au over 2.6 metres (including 16.8 g/t Au over 0.8 metres) in Lynx 1 and 19.5 g/t over 2.0 metres (including 46.3 g/t Au over 0.8 metres) in Lynx 2. The first interval includes up to 5% pyrite clusters, 5% chalcopyrite and crustiform veins within a strongly sericitized gabbro. The second interval is at the contact between a gabbro and a strongly sericitized rhyolite. Fuchsite is also observed. The mineralization is composed of 10% pyrite stringers and few tourmaline ptygmatic veins.

OSK-W-17-1121 contains three intervals in crustiform veins: 19.0 g/t Au over 2.3 metres (including 58.8 g/t Au over 0.7 metres), 3.34 g/t Au over 2.1 metres and 8.62 g/t Au over 2.7 metres (including 13.7 g/t Au over 1.7 metres). The first is between Lynx 1 and Lynx 2 and the second and third are inside Lynx 3 Zone. All are hosted in a silica altered gabbro and mineralization is composed of up to 6% disseminated pyrite, up to 2% disseminated sphalerite and pyrite stringers.

OSK-W-17-1123 intersected 11.6 g/t Au over 2.1 metres (including 47.5 g/t Au over 0.4 metres) in Lynx 2. Mineralization is composed of 20% pyrite stringers within a strong silica alteration at the contact between a rhyolite and an andesite.

OSK-W-17-1128 intersected three intervals: 3.85 g/t Au over 5.5 metres in Lynx 3, 5.00 g/t Au over 2.0 metres in Lynx 2 and 14.0 g/t Au over 2.3 metres (including 25.7 g/t Au over 1.2 metres) in Lynx 6. The first interval is composed of up to 2% smoky quartz veins within a strongly silicified rhyolite, the second interval is within the gabbro and the third interval composed of up to 1% disseminated pyrite is at the contact between a felsic porphyritic intrusion and a gabbro.

OSK-W-17-1169 intersected two intervals 7.14 g/t Au over 2.4 metres (including 21.8 g/t Au over 0.4 metres) and 21.2 g/t Au over 4.3 metres (including 42.4 g/t Au over 1.0 metre). Both intervals correlate to Lynx 4. The first interval is a felsic porphyritic dike crosscutting the hosting rhyolite. The mineralization is composed of up to 15% pyrite stringers and pyrite-tourmaline stringers. The second interval is composed of semi-massive pyrite and trace of sphalerite hosted in a strongly silicified rhyolite.

OSK-W-17-1190 intersected two intervals: 11.0 g/t Au over 2.5 metres and 16.9 g/t Au over 4.0 metres (including 57.2 g/t Au over 0.7 metres). The mineralization in both intervals is composed of up to 10% disseminated pyrite and quartz-tourmaline veins. The first interval is within a strongly sericitized rhyolite, and the second interval is at the contact between a rhyolite and a felsic porphyritic dike. Both intersections correlate to the Lynx 4 corridor  300 meters up plunge of OSK-W-17-827 (57.0 g/t Au over 2.7 metres previously reported July 25, 2017).

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 $250 million in cash and investments (pro-forma recently announced financing).

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 Mining Closes $92.4 Million “Bought Deal” Private Placement of Flow Through Shares and Common Shares, Including Over-allotment Option

NOT FOR DISTRIBUTION TO U.S. NEWS WIRE SERVICES OR FOR DISSEMINATION IN THE UNITED STATES

(Toronto, October 5, 2017) – Osisko Mining Inc. (TSX:OSK) (“Osisko” or the “Corporation”) is pleased to announce, further to its announcements on August 29, 2017, that it has completed a “bought deal” brokered private placement of (i) an aggregate of 8,487,800 common shares of the Corporation that will qualify as “flow-through shares” (within the meaning of subsection 66(15) of the Income Tax Act (Canada)) (“Flow-Through Shares”) for aggregate gross proceeds of approximately $57.4 million, and (ii) an aggregate of 8,334,450 common shares of the Corporation (“Common Shares”) at an issue price of $4.20 per Common Share for aggregate gross proceeds of approximately $35.0 million (the “Offering”). The Flow-Through Shares were issued in two tranches, whereby the first tranche consisted of 6,638,950 Flow-Through Shares at an issue price of $6.93 per “tranche one” Flow-Through Share and the second tranche consisted of 1,848,850 “tranche two” Flow-Through Shares at an issue price of $6.14 per Flow-Through Share.

The Offering was led by Canaccord Genuity Corp. on behalf of a syndicate of underwriters that included BMO Nesbitt Burns Inc., National Bank Financial Inc., Macquarie Capital Markets Canada Ltd., RBC Dominion Securities Inc., Scotia Capital Inc., Eight Capital, Beacon Securities Limited, Cormark Securities Inc., Desjardins Securities Inc., Echelon Wealth Partners Inc., Haywood Securities Inc. and Industrial Alliance Securities Inc.

The gross proceeds from the sale of Flow-Through Shares will be used to fund “Canadian exploration expenses” (within the meaning of the Income Tax Act (Canada)) related to Osiskos projects in Québec on or prior to December 31, 2018 for renunciation to subscribers of Flow-Through Shares effective December 31, 2017. The net proceeds from the sale of Common Shares will be used to fund exploration activities and for general corporate purposes.

All securities issued under the Offering will be subject to a hold period expiring four months and one day from the date hereof. The securities offered have not been registered under the U.S. Securities Act of 1933, as amended, and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements. This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of the securities in any State in which such offer, solicitation or sale would be unlawful.

The following “insiders” of the Corporation have subscribed for Flow-Through Shares or Common Shares under the Offering:

Insider Insider Relationship Shares Purchased

(#)

Subscription Amount

($)

Osisko Gold Royalties Ltd 10% Securityholder of Osisko 850,000 $3,570,000
John Burzynski Director and Senior Officer of Osisko; Director of 10% Securityholder of Osisko 32,600 $200,164
Sean Roosen Director of Osisko; Director and Senior Officer of 10% Securityholder of Osisko 48,900 $300,246
John Hayes Senior Officer of Osisko 4,100 $25,174
José Vizquerra(1) Director and Senior Officer of Osisko 1,008,000 $4,249,120
Robert Wares Director and Senior Officer of Osisko 35,000 $214,900
Bryan Coates Senior Officer of 10% Securityholder of Osisko 40,800 $250,512
André Gaumond Director of 10% Securityholder of Osisko 1,650 $10,131
  Totals 2,021,050 $8,820,247

Note:   (1) Includes subscriptions by José Vizquerra and Mercedes Juliana Benavides.

Each subscription by an “insider” is considered to be a “related party transaction” for purposes of Multilateral Instrument 61-101 – Protection of Minority Security Holders in Special Transactions (“MI 61-101”). Pursuant to MI 61-101, the Corporation has filed a material change report providing disclosure in relation to each “related party transaction” on SEDAR under Osiskos issuer profile at www.sedar.com. The Corporation did not file the material change report more than 21 days before the expected closing date of the Offering as the details of the Offering and the participation therein by each “related party” of the Corporation were not settled until shortly prior to the closing of the Offering, and the Corporation wished to close the Offering on an expedited basis for sound business reasons. The Corporation is relying on exemptions from the formal valuation and minority shareholder approval requirements available under MI 61-101. The Corporation is exempt from the formal valuation requirement in section 5.4 of MI 61-101 in reliance on section 5.5(a) of MI 61-101 as the fair market value of the transaction, insofar as it involves interested parties, is not more than the 25% of the Corporations market capitalization. Additionally, the Corporation is exempt from minority shareholder approval requirement in section 5.6 of MI 61-101 in reliance on section 5.7(b) of MI 61-101 as the fair market value of the transaction, insofar as it involves interested parties, is not more than the 25% of the Corporations market capitalization.

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% interest 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 (82,400 hectares), 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, the Buffonta past producing mine and the Gold Pike mine property. The Corporation also holds interests and options in a number of additional properties in northern Ontario. Osisko continues to be well financed and has approximately $190 million in cash and equity investment.

Cautionary Note Regarding Forward-Looking Information

This news release contains “forward-looking information” within the meaning of applicable Canadian securities legislation based on expectations, estimates and projections as at the date of this news release. Forward-looking information involves risks, uncertainties and other factors that could cause actual events, results, performance, prospects and opportunities to differ materially from those expressed or implied by such forward-looking information. Forward-looking information in this news release includes, but is not limited to, the use of proceeds of the Offering; the timing and ability of the Corporation, if at all, to obtain final approval of the Offering from the Toronto Stock Exchange; an exemption being available under MI 61-101 from the minority shareholder approval and valuation requirements for each related party transaction; objectives, goals or future plans; statements regarding exploration results and exploration plans. Factors that could cause actual results to differ materially from such forward-looking information include, but are not limited to, capital and operating costs varying significantly from estimates; the preliminary nature of metallurgical test results; delays in obtaining or failures to obtain required governmental, environmental or other project approvals; uncertainties relating to the availability and costs of financing needed in the future; changes in equity markets; inflation; fluctuations in commodity prices; delays in the development of projects; the other risks involved in the mineral exploration and development industry; and those risks set out in the Corporations public documents filed on SEDAR at www.sedar.com. Although the Corporation believes that the assumptions and factors used in preparing the forward-looking information in this news release are reasonable, undue reliance should not be placed on such information, which only applies as of the date of this news release, and no assurance can be given that such events will occur in the disclosed time frames or at all. The Corporation disclaims any intention or obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, other than as required by law.

For further information please contact:

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

Osisko Intersects 7.14 g/t Au Over 12.7 Metres At Garrison

(Toronto, October 5, 2017).  Osisko Mining Inc. (OSK:TSX, “Osisko” or the “Corporation”) is pleased to announce new results from the ongoing drill program at its 100% owned Garrison gold project located in Garrison Township, Ontario.  Over 70,000 metres of new drilling have been conducted by Osisko on the Garrison Project to date.  A total of seventeen new intercepts in sixteen holes are reported in this release, with significant assay results presented in the table below.

Significant new results include: 7.14 g/t Au over 12.7 metres in OSK-G17-420; 5.18g/t Au over 17.0 metres and 1.62 g/t Au over 16.1 metres in OSK-G17-412; 1.37g/t Au over 30.2 metres in OSK-G17-408; 2.84 g/t over 7.1 metres in OSK-G17-415.

The new results continue to demonstrate the potential to expand the extent of known mineralization in the 903 Zone. The 2017 drill program will continue to explore extensions of the mineralized zones within the Garrcon, Jonpol and 903 zones.  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-G17-367

186.9 202.2 15.3 1.20   903

 

229.8 240.8 11.0 2.03   903

OSK-G17-370

179.6 188.7 9.1 2.65   903

 

310.0 322.0 12.0 1.33   903

OSK-G17-371A

203.6 216.6 13.0 1.65   903

 

305.8 317.2 11.4 2.00   903

OSK-G17-379

249.3 251.3 2.0 5.37   903

OSK-G17-396

48.6 64.6 16.0 1.03   903

OSK-G17-400

177.0 179.0 2.0 6.44   903

OSK-G17-406

122.7 130.7 8.0 2.44   903

 

155.9 171.0 15.1 1.43   903

OSK-G17-408

47.8 78.0 30.2 1.37   903

OSK-G17-412

170.9 187.0 16.1 1.62   903

 

264.0 281.0 17.0 5.18   903

including

264.0 269.0 5.0 14.6   903

 

289.0 291.0 2.0 10.4   903

OSK-G17-415

92.5 99.6 7.1 2.84   903

OSK-G17-420

114.0 126.7 12.7 7.14   903

Notes:  True Widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.

 

Hole Number Azimuth
(°)
Dip
(°)
Length
(m)
UTM E UTM N Section
OSK-G17-345 346 -51 180 576870 5373421 3050W
OSK-G17-367 339 -47 372 577307 5373101 2750W
OSK-G17-370 331 -47 516 577594 5373044 2500W
OSK-G17-371A 339 -50 551 576899 5372903 3200W
OSK-G17-374A 334 -45 354 576661 5372970 3400W
OSK-G17-382 340 -60 429 576587 5372885 3500W
OSK-G17-379 339 -53 504 577048 5373076 3000W
OSK-G17-396 338 -45 297 576986 5373248 3000W
OSK-G17-400 340 -47 361 577027 5373284 2950W
OSK-G17-404 340 -45 240 576764 5373116 3250W
OSK-G17-406 340 -46 246 577010 5373183 3000W
OSK-G17-408 339 -45 282 577387 5373317 2600W
OSK-G17-411 341 -47 414 577355 5373113 2700W
OSK-G17-412 339 -45 396 577069 5373168 2950W
OSK-G17-415 340 -46 417 577260 5373080 2800W
OSK-G17-420 341 -45 303 577228 5373169 2800W

 

OSK-G17-367 was drilled in the central section of the 903 Zone targeting extensions of the main 903 syenite body to depth. Two intervals in the 903 syenite intersected 1.20 g/t Au over 15.3 metres and 2.03 g/t Au over 11.0 metres. The two broad zones are hosted in syenite showing a porphyritic texture and significant fracturing containing specular hematite and pyrite mineralization.

OSK-G17-370 targeted the eastern extension of the main 903 Zone and 903 South Zone along strike. The hole intersected a new shallow mineralized zone along the flow contact between an ultramafic volcanic and mafic volcanic. This horizon contains limited syenite surrounded by a broad quartz carbonate veining over 10 metres and averaging 2.65 g/t Au over 9.1 metres. A second mineralized zone was intersected along the eastern extension of the 903 South Zone horizon characterized by intense quartz and iron carbonate fracturing adjacent to diabase and hosted within ultramafic volcanic. This interval reported a average of 1.33 g/t Au over 12.0 metres.

OSK-G17-371A, 374A and 382 were drilled southwest of the main 903 syenite, targeting a linear magnetic low that may represent a fault offset extension of the main 903 Zone extending west. All three holes intersected a zone of mariposite alteration ranging from 50 to 75 metres in width containing syenite coincident with the magnetic low. Anomalous gold grades were reported from holes 374A and 382. OSK-G17-371A intersected two separate syenite dykes ranging in width from 15 to 40 metres. The first syenite dyke showed a brick red hematite alteration and limited quartz veining which averaged 1.65 g/t Au over 13.0 metres. The second broader syenite contained considerable quartz – iron carbonate veining up to 1 metre in width a long with minor hematite alteration and disseminated pyrite; this interval averaged 2.00 g/t Au over 11.4 metres.

OSK-G17-379, 396, 406 were drilled along section 3000W in the western section of the main 903 Zone. Each of the holes intersected syenite within the 903 Zone. A strong interval of quartz – iron carbonate veining and hematite alteration was found in OSK-G17-396 reporting a shallow intercept averaging 1.03 g/t Au over 16.0 metres. Drilling 55 metres below this intercept hole OSK-G17-406 also intersected syenite containing significant iron – carbonate veining along with a moderate hematite alteration believed to be the extension of the zone found in OSK-G17-396. Within the syenite dykes two mineralized zones averaged 2.44 g/t Au over 8.0 metres and 1.43 g/t Au over 15.1 metres.  Below this interval (110 metres) OSK-G17-379 intersected syenite dykes hosted within mariposite schist. An interval within the dyke assayed 5.37 g/t Au over 2.0 metres also coincident with veining and hematite alteration.

OSK-G17-400, 412 were drilled along section 2950W within the main 903 Zone. Drill hole OSK-G17-400 was drilled north of the main syenite body and did not intersected any significant dykes; drilling into the footwall metasediment the hole intersected a 5 cm quartz-iron carbonate vein and surrounding fracturing that averaged 6.44 g/t Au over 2.0 metres. Testing 120 metres below OSK-G17-400,OSK-G17-412 intersected a broad zone of syenite along the main trend of the 903 Zone. Within the syenite was quartz-iron carbonate veining with moderate hematite alteration of the syenite as well as along fractures and showing disseminated pyrite within the syenite; this interval averaged 1.62 g/t Au over 16.1 metres. This hole also intersected the footwall metasediment within which a broad chlorite alteration zone containing quartz and iron carbonate veining from 2-40 cm in width and showing disseminated pyrite within the metasediment, averaging 5.18 g/t Au over 17.0 metres. A second interval within the metasediment showing only limited quartz-iron carbonate fracturing to 1 cm width averaged 10.4 g/t Au over 2.0 metres.

OSK-G17-408 was drilled along the eastern strike extension of the 903 Zone targeting the up dip extension of syenite intersected in OSK-G17-332 (1.09 g/t Au over 17.0 metres, March 15, 2017). The hole intersected syenite 35 metres up dip of OSK-G17-332. The syenite contained moderate quartz – iron carbonate veins from 10 to 20 cm in width along with hematite alteration and disseminated pyrite. This shallow interval averaged 1.37 g/t Au over 30.2 metres

OSK-G17-415, 420 were drilled along section 2800W in the central 903 Zone. OSK-G17-415 was drilled 50 metres down dip of OSK-G17-335 (1.57g/t Au over 10.0 metres and 1.49 g/t Au over 9.0 metres, March 15, 2017). The hole successfully intersected the main 903 syenite dyke at a vertical depth of 185 metres but reported limited mineralization. The upper part of hole OSK-G17-415 intersected the southern 903 Zone within highly altered metasediment containing sericite and iron carbonate alteration. Very fine disseminated pyrite along with 1-2 cm quartz – iron carbonate veins contained within the metasediment averaged 2.84 g/t Au over 7.1 metres.  OSK-G17-420 was drilled 50 metres up dip from OSK-G17-335, intersecting a 75 metre wide syenite body. Within the upper contact of the syenite there is considerable strong hematite alteration along with limited quartz – iron carbonate veining and 2-3% coarse disseminated pyrite; this interval returned 7.14 g/t Au over 12.7 metres.

OSK-G17-345, -404, -411 did not intersect significant mineralization.

Qualified Person
The scientific and technical content of this press release has been reviewed, prepared and approved by Mr. Greg Matheson, P.Geo. Senior Project Manager of the Garrison gold project, who is a “Qualified Person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“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. 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 4g/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%. The trial production permit remains active.

Jonpol Zone
Jonpol is situated in the Munro Fault Zone, a west striking splay off the north side of the Destor-Porcupine Fault. Hosted in a shear zone tens of metres wide in altered mafic volcanic rocks, the deposit consists of four high grade gold mineralized zones (JP, JD, RP and East) over a strike length of 1.7 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 metre level with mining on six sublevels. The Jonpol infrastructure underwent reclamation in the late 1990s and was closed out in 2001, but the existing ramp and shaft are preserved.

About Osisko Mining Inc.
Osisko 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 (82,400 hectares), 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, the Buffonta past producing mine and the Gold Pike mine property. The Corporation also holds interests and options in a number of additional properties in northern Ontario.  Osisko continues to be well financed and has approximately $246 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 27 g/t Au Over 2.7 Metres At Lynx

High Grade Lynx Deposit Expanded Additional 210 Meters to NE

(Toronto, October 3, 2017)  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 Urban Township, Abitibi, 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.

Highlights from the new results include: 27.0 g/t Au over 2.7 metres in OSK-W-17-906; 11.6 g/t Au over 4.4 metres in OSK-W-17-1039; 13.0 g/t Au over 3.6 metres in OSK-W-17-1102; 23.4 g/t Au over 2.0 metres in OSK-W-17-918; and 22.0 g/t Au over 2.0 metres in OSK-W-17-958. 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-17-899 243.0 245.0 2.0 4.46   Lynx 2 Lynx
OSK-W-17-906 169.3 172.0 2.7 27.0   Lynx HW Lynx
including 169.3 170.2 0.9 76.9  
  174.0 176.5 2.5 4.25   Lynx HW Lynx
including 174.6 175.0 0.4 21.9      
  276.0 280.0 4.0 5.05   Lynx 2 FW Lynx
OSK-W-17-909 869.0 872.7 3.7 4.33   VNCR Lynx
including 872.0 872.7 0.7 18.6  
OSK-W-17-918 238.0 240.0 2.0 23.4   Lynx 2 Lynx
including 238.7 239.3 0.6 61.3  
OSK-W-17-929 936.5 938.5 2.0 18.9   Lynx 1 Lynx
including 937.2 937.6 0.4 62.6  
OSK-W-17-939 246.0 248.0 2.0 12.1   Lynx 1 Lynx
including 246.0 247.0 1.0 20.6  
  296.0 298.0 2.0 4.71   Lynx 2 Lynx
OSK-W-17-958 500.0 502.0 2.0 22.0   Lynx 1 Lynx
including 500.0 500.5 0.5 87.0  
  712.0 717.0 5.0 5.74   Lynx 4 Lynx
  1070.0 1072.0 2.0 5.36   TBD Lynx
OSK-W-17-986 317.0 320.1 3.1 5.69   VNCR Lynx
including 317.0 318.0 1.0 15.9  
OSK-W-17-987 270.2 272.2 2.0 5.77   VNCR Lynx
including 270.7 271.9 1.2 9.06  
OSK-W-17-1021 68.0 70.2 2.2 9.72   VNCR Lynx
OSK-W-17-1039 436.9 441.3 4.4 11.6   Lynx 1 Lynx
including 436.9 437.9 1.0 34.4  
OSK-W-17-1044 242.0 244.1 2.1 3.03   Lynx 1 Lynx
OSK-W-17-1068 451.9 454.3 2.4 4.77   Lynx HW Lynx
OSK-W-17-1091 60.4 62.7 2.3 11.3   Lynx 1 Lynx
including 61.0 62.0 1.0 25.2  
OSK-W-17-1102 280.9 284.5 3.6 13.0   Lynx 2 Lynx
including 280.9 281.6 0.7 55.4  
OSK-W-17-1121 303.0 305.0 2.0 4.29   Lynx 1 Lynx
  309.5 313.5 4.0 7.78   Lynx 1 Lynx
including 309.5 311.2 1.7 14.9  
OSK-W-17-1169 573.0 576.5 3.5 4.23   Lynx 2 Lynx
including 575.6 576.5 0.9 12.6  

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: HG = Hanging wall; FW = Foot Wall; VNCR = crustiform vein; TBD = to be determined.
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-W-17-899 334 -57 303 453219 5434913 3350
OSK-W-17-906 331 -56 441 453349 5434937 3475
OSK-W-17-909 131 -55 1119 453683 5435677 4125
OSK-W-17-918 335 -57 372 453387 5434953 3525
OSK-W-17-929 130 -58 1218 453871 5435782 4350
OSK-W-17-939 327 -51 414 453376 5434898 3475
OSK-W-17-958 143 -55 1212 453359 5435439 3725
OSK-W-17-986 328 -66 360 453447 5435019 3600
OSK-W-17-987 339 -60 327 453224 5434909 3350
OSK-W-17-1021 333 -55 621 452990 5434889 3150
OSK-W-17-1039 147 -49 513 453361 5435436 3725
OSK-W-17-1044 333 -70 381 453477 5435045 3650
OSK-W-17-1068 130 -45 513 453253 5435282 3575
OSK-W-17-1091 332 -51 246 453207 5434962 3375
OSK-W-17-1102 330 -50 345 453275 5434899 3400
OSK-W-17-1121 335 -64 465 453436 5434958 3550
OSK-W-17-1169 129 -55 1437 453330 5435468 3725

 

OSK-W-17-899 intersected Lynx 2 returning 4.46 g/t Au over 2.0 metres. Mineralization includes up to 6% pyrite as disseminations and clusters and pyrite stringers hosted within weak to moderate chloritized rhyolite, and 1-3% pyrite within weakly developed crustiform veins occurring near the contact between the rhyolite and gabbro. This interval expands the Lynx 2 corridor 35 metres north-east of OSK-W-17-805 (12.4 g/t Au over 5.0 metres previously reported June 16, 2017).

OSK-W-17-906 intersected three intervals:  27.0 g/t Au over 2.7 metres, 4.25 g/t Au over 2.5 metres, both related to Lynx HW and finally 5.05 g/t Au over 4.0 metres related to Lynx 2 FW. Mineralization is hosted in a felsic volcanic cut by quartz veins (pervasive silica flooding) with 30% disseminated pyrite and local visible gold. The second interval is in a porphyritic felsic intrusion cut by small quartz veins with 5-7% disseminated pyrite. Mineralization for the third interval consists of up to 2% disseminated pyrite hosted in a weak sericitized and strong silicified felsic volcanic. This intersection extends Lynx 2 corridor 35 metres north-east of OSK-W-17-803 (5.23 g/t Au over 2.3 metres previously reported April 11, 2017).

OSK-W-17-909 intersected 4.33 g/t Au over 3.7 metres related to crustiform veins containing 3% disseminated pyrite.  The crustiform veins do not correlate to a known zone within the Lynx corridor.

OSK-W-17-918 intersected 23.4 g/t Au over 2.0 metres in Lynx 2. The interval includes 10-15% pervasive silica flooding, 3-5% pyrite tourmaline stringers within a sericitized fragmental felsic intrusion. It is located 10 metres below OSK-W-17-825 (4.06 g/t Au over 2.0 metres previously reported May 10, 2017).

OSK-W-17-929 intersected 18.9 g/t Au over 2.0 metres in Lynx 1, containing locally 8% disseminated pyrite within a moderately to strongly silicified gabbro. It is 210 metres down plunge and north-east of OSK-W-17-909 (11.8 g/t Au over 2.0 metres previously reported September 18, 2017).

OSK-W-17-939 intersected two intervals: 12.1 g/t Au over 2.0 metres in Lynx 1 and 4.71 g/t over 2.0 metres in Lynx 2. The first interval includes trace pyrite and 5% pyrite tourmaline stringers within a weakly sericitized felsic intrusion. The second interval is similar but hosted at the contact between a felsic dike and a volcanic. This interval is 35 metres up plunge and north-east of OSK-W-17-788 (17.0 g/t Au over 17.3 metres, previously reported April 5, 2017).

OSK-W-17-958 intersected three intervals: 22.0 g/t Au over 2.0 metres in Lynx 1, 5.74 g/t Au over 5 metres in Lynx 4  and 5.36 g/t Au over 2.0 metres. The first interval, weakly bleached by sericite and moderate patchy silica alteration, contains 5-7% pyrite stringers, traces of chalcopyrite and quartz-tourmaline veining.  It correlates 25 metres east to OSK-W-17-887 (24.3 g/t Au over 2.6 metres previously reported July 25, 2017). The second interval is strongly altered by fuchsite and locally strongly altered by pervasive silica flooding with up to 10-15% disseminated pyrite and traces of chalcopyrite. This interval contains 20% crustiform veins. The second interval corresponds to a new extension of the Lynx 4 HW and correlates 170 metres north-east of OSK-W-17-817 (13.3 g/t Au over 2 metres previously reported July 12, 2017).  The third interval contains trace pyrite in a quartz vein hosted by a weak silicified and sericitized and strong chloritized gabbro. This interval is within the Lynx corridor, zone to be determined.

OSK-W-17-986 intersected 5.69 g/t Au over 3.1 metres related to a crustiform vein in the Lynx Corridor. Mineralization consists of crustiform quartz-carbonate veins (20-60 centimetres) with pervasive silica flooding hosted in a bleached gabbro with 15% disseminated pyrite, tourmaline-pyrite stringers and local visible gold. The crustiform veins are located 30 metres below and northeast of another crustiform vein previously reported in OSK-W-17-859 (73.5 g/t Au over 2.2 metres, July 12, 2017).

OSK-W-17-987 intersected 5.77 g/t Au over 2.0 metres. Mineralization contains 2% pyrite stringers associated with quartz carbonate and tourmaline veins hosted in a fuschitized and chloritized gabbro, and correlates to a crustiform vein in the Lynx 2 corridor above another crustiform vein in OSK-W-16-740 (5.69 g/t Au over 4.6 metres previously reported January 11, 2017).

OSK-W-17-1021 intersected 9.72 g/t Au over 2.2 metres. Mineralization consists of two crustiform veins with 1% pyrite silicified bands surrounded by felsic intrusion with 2% disseminated pyrite.

OSK-W-17-1039 intersected 11.6 g/t Au over 4.4 metres. The interval is a strongly silicified fragmental felsic intrusion which contains 5% disseminated pyrite and 5% pyrite in a quartz-tourmaline vein (over 10 centimetres). It is located 30 metres north-east of OSK-W-17-912 (6.65 g/t Au over 2.8 metres previously reported August 24, 2017).

OSK-W-17-1044 intersected 3.03 g/t Au over 2.1 metres in Lynx 1. Mineralization is hosted in a bleached, chloritized and epidotized mafic volcanic containing 2% pyrite clusters and 3% pyrite stringers. The hole is 50 metres north-east of OSK-W-17-790 (11.3 g/t Au over 3.6 metres previously reported March 28, 2017).

OSK-W-17-1068 intersected 4.77 g/t Au over 2.4 metres in the Lynx HW Zone. This interval contains pervasive silica flooding with 20% pyrite clusters and 10% pyrite stringers. Both lower and upper contacts are ptygmatic tourmaline veins, hosted in a sericitized large quartz eye felsic intrusion. The interval is 80 metres south-west of OSK-W-17-848 (15.1 g/t Au overs 2.1 metres previously released September 18).

OSK-W-17-1091 intersected 11.3 g/t Au over 2.3 metres in Lynx 1. The interval is within a strongly sericitized felsic volcanic with trace pyrite clusters and traces of pyrite stringers, located 5 metres up plunge and west of OSK-W-16-755 (11.8 g/t Au over 6.0 metres previously reported January 11, 2017).

OSK-W-17-1102 intersected 13.0 g/t Au over 3.6 metres in Lynx 2. This interval consists of a quartz-tourmaline vein (5 centimetres) with 7% pyrite and a pervasive silica flooding with 15% pyrite and 1% pyrite stringer in a sericitized and silicified rhyolite. The interval is 15 metres down plunge and north-east of OSK-W-17-899 (4.46 g/t Au over 2.0 metres, this press release).

OSK-W-17-1121 intersected two intervals: 4.29 g/t Au over 2.0 metres and 7.78 g/t Au over 4.0 metres, both in Lynx 1. The mineralization is hosted at a rhyolite and felsic intrusion contact and composed of 2-3% of pervasive silica flooding with up to 3% pyrite stringers and disseminated pyrite.  The intersection is 15 metres south-west of OSK-W-17-792 (42.1g/t Au over 9.2 metres, previously reported April 5, 2017).

OSK-W-17-1169 intersected 4.23 g/t Au over 3.5 metres in Lynx 2. Mineralization consists of 10% disseminated pyrite in silica altered gabbro. It is 120 metres down plunge and east OSK-W-17-958 (9.18 g/t Au overs 2.2 metres previously reported September 18, 2017).

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 $246 million in cash and investments (pro-forma recently announced financing).

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