Osisko Intersects 97.4 g/t Au Over 8.4 Metres At Windfall

 (Toronto, May 30th, 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 Windfall Lake gold project located in Urban Township, Québec.  The current 400,000 metres drill program combines definition drilling above the Red Dog intrusion (“Red Dog”), expansion drilling above and below Red Dog, expansion drilling to the NE of the main deposit, and exploration drilling on the greater deposit and Urban-Barry Project area.  Significant new assay results from thirteen intercepts in ten drill holes focused on infill and expansion drilling in the main Windfall deposit and Lynx Zone are reported in the table below.

Highlights from the new results include:  97.4 g/t Au over 8.4 metres (33.7 g/t Au over 8.4 metres cut) in DDH OSK-W-17-837 in the Lynx Corridor and 116 g/t Au over 2.4 metres (46.4 g/t Au over 2.4 metres cut) in DDH OSK-W-17-836 in the new Lynx 5 discovery; 189 g/t Au over 2.0 metres (25.1 g/t Au over 2.0 metres cut) DDH OSK-W-17-814 in Zone 27 Corridor and 29.1 g/t Au over 2.6 metres in DDH OSK-OBM-16-697 in Underdog Corridor.  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-17-827 255.0 258.0 3.0 14.6   Lynx 1 FW Lynx
  354.0 356.5 2.5 7.51   Lynx 1 HW Lynx
including 354.0 355.5 1.5 12.4  
OSK-W-17-836 868.0 870.4 2.4 116 46.4 Lynx 5 Lynx
including 869.3 870.4 1.1 253 100
OSK-W-17-837 320.0 328.4 8.4 97.4 33.7 Lynx 2 Lynx
including 320.7 322.8 2.1 65  
and 324.7 325.4 0.7 865 100
  335.9 339.0 3.1 5.77   VNCR Lynx
OSK-W-17-814 118.5 120.5 2.0 189 25.1 Z27 1 Zone 27
including 120.0 120.5 0.5 756 100
OSK-W-17-844 520.8 523.6 2.8 11.6   CS3 Caribou
including 521.7 522.6 0.9 33.7  
OSK-W-17-854 369.0 371.9 2.9 9.07   CN2 Caribou
including 370.5 371.0 0.5 33  
OSK-OBM-16-697 799.0 801.1 2.1 15.3   FW3U Underdog
including 800.3 801.1 0.8 40.1  
  804.1 806.7 2.6 29.1   FW3U Underdog
including 804.1 804.7 0.6 90.1  
OSK-W-17-663-W1 648.0 650.0 2.0 4.64   FW3U Underdog
OSK-W-17-807-W2 868.5 870.5 2.0 7.15     Underdog
OSK-W-17-821 1174.5 1177.8 3.3 9.27   FW3 Underdog
including 1176.6 1177.8 1.2 21.0  

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 and VNCR = crustiform vein.

 

Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-OBM-16-697 330 -54 885 452501 5434610 2575
OSK-W-17-663-W1 330 -53 822.2 452402 5434658 2500
OSK-W-17-807-W2 320 -58 1156.5 452306 5434421 2325
OSK-W-17-814 329 -62 204 451927 5434612 2100
OSK-W-17-821 334 -66 1258.6 452738 5434475 2700
OSK-W-17-827 145 -63 957 453173 5435126 3425
OSK-W-17-836 145 -68 1045.4 453548 5435280 3825
OSK-W-17-837 332 -75 465 453483 5435060 3925
OSK-W-17-844 333 -57 1092 452727 5434546 2750
OSK-W-17-854 330 -53 846 452483 5434596 2550

 

Lynx Corridor

OSK-W-17-827 returned 14.6 g/t Au over 3.0 metres and 7.51 g/t Au over 2.5 metres including 12.4 g/t Au over 1.5 metres. The first interval is associated with the Lynx 1 footwall and hosted in an altered fragmental rhyolite with traces of disseminated pyrite.  The hole is located 45 metres east of OSK-W-16-740 which returned 4.72 g/t Au over 8.2 metres (previously reported, January 11th, 2017). The second interval is a weakly altered felsic dike with traces of disseminated pyrite located in the Lynx 1 hanging wall.

OSK-W-17-836 returned 116 g/t over 2.4 metres.  The mineralized zone consists of an altered rhyolite with traces of visible gold and 3 to 5% pyrite in stringers and in pyrite-tourmaline veinlets. This interval represents the discovery of a new zone (Lynx 5) located 250 metres south of Lynx 1 and 60 metres south of Lynx 4.

OSK-W-17-837 Additional assays have been received from previously reported open interval of 42.4 g/t Au over 4.7 metres (press release dated May 24th, 2017).  The additional new assays have improved both the grade and length of the previous Lynx 2 intercept to 97.4 g/t Au over 8.4 metres (33.7 g/t Au over 8.4 metres cut)This high grade zone is hosted in an altered fragmental felsic dike with fuschite and 3 to 5% disseminated pyrite.  A second interval in this hole returned 5.77 g/t Au over 3.1 metres and corresponds to a crustiform vein located 70 metres east of OSK-W-17-799 (11.0 g/t Au over 6.5 metres previously reported April 5th, 2017).

Zone 27 Corridor

OSK-W-17-814 intersected Zone 27 returning 189 g/t Au over 2.0 metres (25.1 g/t Au over 2.0 metres cut).  Mineralization is associated with up to 7% pyrite stringers observed at an altered contact between a massive gabbro and a felsic dike.  This intercept extends Zone 27 by 30 metres to the west of OSK-W-17-810 (6.54 g/t Au over 2.3 metres previously reported April 25th, 2017).

Caribou Corridor

OSK-W-17-844 is an infill hole in the CS3 Zone and returned 11.6 g/t Au over 2.8 metres.  Mineralization is composed of 5% disseminated pyrite and 3% pyrite stringers within a strongly altered porphyritic felsic dike.

OSK-W-17-854 intersected the CN2 Zone returning 9.07 g/t over 2.9 metres (including 33.0 g/t Au over 0.5 metres).  Mineralization comprises up to 50% pyrite-tourmaline stringers within a bleached intermediate volcanic unit. This intersection is located twenty-five meters south of OSK-OBM-16-687, which intersected 6.61 g/t Au over 7.0 metres (previously released July 26th, 2016).

Underdog Corridor:

OSK-OBM-16-697 is an extension of a previously drilled hole (OBMN-16-697), targeting the FW3U Zone.  The hole returned two intersections: 15.3 g/t Au over 2.1 metres (including 40.1 g/t Au over 0.8 metres) and 29.1 g/t Au over 2.6 metres (including 90.1 g/t Au over 0.6 metres).  Mineralization consists of 1 to 5% pyrite in stringers (locally 10 to 35%) and 10% irregular quartz-carbonate veins occurring near a contact between intermediate volcanics and a porphyritic dike. These intervals extend the FW3U Zone 40 metres to the northeast.

OSK-W-17-663-W1 within the FW3U Zone intersected 4.64 g/t Au over 2.0 metres.  Mineralization contains 7 to 10% pyrite-tourmaline stringers within a fragmental intermediate volcanic unit. This hole extends the FW3U Zone an additional 70 metres to the east of previously reported EAG-11-254 ext (24.7 g/t Au over 6.8 metres released April 14th, 2016).

OSK-W-17-807-W2 intersected 7.15 g/t Au over 2.0 metres between zones FW1 and FW3. Mineralization comprises 2% pyrite-tourmaline stringers occurring in an altered fragmental porphyritic dike. This intersection correlates with no known zone and may represent a new mineralized zone.

OSK-W-17-821 returned 9.27 g/t Au over 3.3 metres (including 21.0 g/t Au over 1.2 metres). Mineralization consists of 20 to 25% pyrite-tourmaline stringers and 5% disseminated pyrite hosted in a weakly to moderately altered fragmental porphyritic dike. This intersection extends the FW3 corridor an additional 100 metres to the northeast.

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 width determinations are estimated at 65 – 80% true core lengths.  Assay are uncut except where indicated, and calculated intervals are reported over a minimum length of 2 metres using a lower cutoff of 3 g/t Au. All NQ core assays reported were obtained by either 1 kilogram whole rock metallic screen/fire assay or standard 50 gram fire-assaying with AA or gravimetric finish at ALS Laboratories in Val dOr, Québec or Sudbury, Ontario. The 1 kilogram metallic screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. All 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 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 Windfall Lake Gold Deposit
The Windfall Lake gold deposit is located between Val-dOr and Chibougamau in the Abitibi region of Québec, Canada. The current mineral resource 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 (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 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 Ontario.  Osisko continues to be well financed with approximately $190 million in cash and investments.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the Windfall Lake gold deposit being one of the highest grade resource-stage gold projects in Canada; the current 400,000 metre drill program at Red Dog; 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 above Red Dog, expansion drilling above and below Red Dog, expansion drilling to the NE of the main 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 20.6 g/t Au Over 2.0 Metres At Garrison

25,000 Metres Added to Garrison Drill Program

(Toronto, May 25, 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.  To date, over 45,000 metres of new drilling have been conducted by Osisko on the Garrison Project.  An additional 25,000 metres of drilling has been added to the Garrison Project to further test the known Garrcon, Jonpol and 903 zones.  A total of nine new intercepts in thirteen holes are reported in this release, with significant assay results presented in the table below.

Significant new results include: 20.6 g/t Au over 2.0 metres and 2.93 g/t Au over 7.2 metres in OSK-G17-348; and 4.72 g/t Au over 7.0 metres in OSK-G17-349.

The new results have demonstrated the potential to expand the extent of known mineralization in the 903 Zone and beneath the Garrcon Zone. The increased drill program for 2017 will continue to follow new 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-G17-348 85.5 92.7 7.2 2.93   903
  106.0 113.0 7.0 2.57   903
  248.0 250.0 2.0 20.6 15.2 903
including 249.0 250.0 1.0 40.7 30.0 903
OSK-G17-349 168.3 175.3 7.0 4.72   903
including 169.8 170.8 1.0 15.7   903
OSK-G17-351 101.2 117.0 15.8 1.35   903
  139.6 155.0 15.4 1.12   903
  181.0 188.0 7.0 2.39   903
OSK-G17-352 315.7 321.2 5.5 2.90   903
OSK-G17-350 563.0 565.2 2.2 7.93   Garrcon
including 564.1 564.7 0.6 28.6   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-G17-337 337 -63 642 578356 5373576 1600W
OSK-G17-340 340 -46 207 577268 5373351 2700W
OSK-G17-347 160 -50 186 576881 5373276 3100W
OSK-G17-348 340 -45 271 577273 5373190 2750W
OSK-G17-349 340 -47 447 577073 5373301 2900W
OSK-G17-350 340 -46 769 577934 5373274 2100W
OSK-G17-351 340 -45 369 577319 5373209 2700W
OSK-G17-352 340 -60 465 576951 5373037 3100W
OSK-G17-353 338 -46 273 577383 5373179 2650W
OSK-G17-355 338 -46 273 577277 5373033 2800W
OSK-G17-356 338 -46 507 577653 5373172 2400W
OSK-G17-357 340 -45 270 577490 5373325 2500W
OSK-G17-359 335 -47 414 577524 5373231 2500W

 

OSK-G17-348 and OSK-G17-351 were drilled in the central section of the 903 Zone targeting the down dip extension of the intersection in drill hole OSK-G17-326 (16.7 g/t Au over 16.4 metres, previously reported). The holes extended the mineralized zone 50 metres down dip and 50 metres west of the prior intersections with multiple intersections of syenite showing coarse sulphide mineralization and hematite alteration. DDH OSK-G17-348 intersected three zones of mineralization: 2.93 g/t Au over 7.2 metres, 2.57 g/t Au over 7.0 metres and 20.6 g/t Au over 2.0 metres.  DDH OSK-G17-351 also intersected three mineralized zones: 1.35 g/t Au over 15.8 metres, 1.12 g/t Au over 15.4 metres and 2.39 g/t Au over 7.0 metres.

OSK-G17-349 was drilled 150 metres west of DDH OSK-G17-348 along strike of the 903 Zone. This hole targeted the 903 Zone footwall sediment mineralization 85 metres up dip from previously reported intersection in OSK-G16-318 (2.90 g/t Au over 19.6 metres).  A zone of sericite altered fine grained sediment was intersected returning 4.72 g/t Au over 7.0 metres (including 15.7 g/t Au over 1.0 metre).

OSK-G17-352 targeted the main 903 Syenite Zone 350 metres west of DDH OSK-G17-348.   The hole intersected a highly deformed and sericite altered syenite dike with significant quartz vein content hosted within mariposite schist. The quartz rich syenite returned 2.90 g/t Au over 5.5 metres.  

OSK-G17-350 targeted the eastern extension of Garrcon style mineralization along the footwall of the Destor Porcupine Fault, hosted within strongly sericite altered metasediment containing narrow intervals of iron formation. This hole is 100 meters east along strike of previously reported intersection in OSK-G17-331 (10.9 g/t Au over 3.9 metres).  The new hole intersected 7.93 g/t Au over 2.2 metres (including 28.6 g/t Au over 0.6 metres) from veins  cross cutting iron formation containing 5% coarse pyrite along the vein wall and local fine grained visible gold.

OSK-G17-337, -340, -347, -353, -355, -356, -357, -359 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. 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 3 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 AA 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 $190 million in cash and equity investment.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the ongoing drill program at the Garrison gold project; results of the current 35,000 metre 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 42.4 g/t Au Over 4.7 Metres At Windfall

Multiple High Grade Intersections in Lynx Discovery Corridor

(Toronto, May 24, 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 Windfall Lake gold project located in Urban Township, Québec.  The current 400,000 metre drill program combines definition drilling above the Red Dog intrusion (“Red Dog”), expansion drilling above and below Red Dog, expansion drilling to the NE of the main deposit, and exploration drilling on the greater deposit and Urban-Barry Project area.  Significant new analytical results from 19 intercepts in 10 new holes, two wedge drill holes and one extension of an historic drill hole focused on infill and expansion drilling in the main Windfall deposit are reported in the table below.

Highlights from the new results include:  three significant intercepts of 42.4 g/t Au over 4.7 metres; 16.8 g/t Au over 5.4 metres; and 43.9 g/t Au over 3.4 metres (35.5 g/t Au over 3.4 metres cut) all from DDH OSK-W-17-837 in the Lynx Corridor; 37.9 g/t Au over 2.7 metres (31.6 g/t Au over 2.7 metres cut) in DDH OSK-EAG-13-502 in the Underdog Corridor;  and 13.5 g/t Au over 7.1 metres in DDH OSK-17-823 in Caribou Corridor.  Maps showing drill 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-17-803
372.0
374.3
2.3
6.38
 
VNCR
Lynx
OSK-W-17-825
274.0
276.2
2.2
6.88
 
Lynx 1
Lynx
including
274.8
275.2
0.4
21.6
 
 
280.5
283.9
3.4
23.8
 
Lynx 1
Lynx
including
280.5
281.3
0.8
92.1
 
 
289.8
292.5
2.7
5.27
 
Lynx 1
Lynx
OSK-W-17-831
457.7
460.0
2.3
4.61
 
Lynx 1
Lynx
OSK-W-17-834
277.6
280.0
2.4
16.6
 
Lynx 2
Lynx
OSK-W-17-836
307.2
309.7
2.5
18.5
 
New
Lynx
including
307.2
307.7
0.5
85.2
 
OSK-W-17-837
207.0
210.4
3.4
43.9
35.5
Lynx 1 HW
Lynx
including
210.0
210.4
0.4
172
100
 
285.8
291.2
5.4
16.8
 
Lynx 1
Lynx
including
285.8
287.2
1.4
45.7
 
 
320.0
324.7
4.7
42.4
 
Lynx 2
Lynx
including
321.6
322.5
0.9
95.3
 
Lynx 2
Lynx
including
324.0
324.7
0.7
78.0
 
Lynx 2
Lynx
OSK-W-17-804
69.5
71.5
2.0
3.59
 
Z27 HW
Zone 27
including
69.5
69.8
0.3
19.1
 
OSK-W-17-824
150.9
152.9
2.0
3.28
 
Z27-1
Zone 27
OSK-W-17-813
522.8
525.0
2.2
4.16
 
CS1
Caribou
OSK-W-17-823
486.9
494.0
7.1
13.5
 
CS1 HW
Caribou
including
490.0
492.0
2.0
37.7
 
 
552.2
554.3
2.1
5.43
 
CS1 FW
Caribou
OSK-W-17-823-W1
503.0
508.4
5.4
8.05
 
CS1 HW
Caribou
including
507.1
508.4
1.3
23.8
 
 
535.0
537.4
2.4
18.6
 
CS1
Caribou
including
535.0
536.0
1.0
43.9
 
OSK-EAG-13-502
695.5
698.2
2.7
37.9
31.6
FW3U
Underdog
including
696.1
696.6
0.5
134
100
OSK-W-17-466-W1
718.8
724.0
5.2
8.52
 
FW3U
Underdog
including
718.8
719.8
1.0
35.7
 

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-W-17-466-W1
330
-52
861
452484
5434643
2600
OSK-W-17-803
331
-64
412.5
453305
5434943
3450
OSK-W-17-804
342
-42
201
451941
5434625
2100
OSK-W-17-813
331
-63
667.5
452610
5434457
2600
OSK-W-17-823
330
-57
620.3
452565
5434414
2550
OSK-W-17-823-W1
330
-57
618
452563
5434410
2550
OSK-W-17-824
330
-67
220
451948
5434608
2100
OSK-W-17-825
145
-54
579
453252
5435182
3525
OSK-W-17-831
330
-50
561
453548
5435282
3825
OSK-W-17-834
144
-59
402
453247
5435189
3525
OSK-W-17-836
145
-68
1045.4
453548
5435280
3825
OSK-W-17-837
332
-75
465
453483
5435060
3650
OSK-EAG-13-502
331
-56
801
452507
5434696
2625

 

Lynx Corridor

OSK-W-17-803 returned 6.38 g/t Au over 2.3 metres from quartz-carbonate-chlorite crustiform veining with 1% disseminated pyrite and in stringers.  This intersection is located 60 metres west of the previously reports OSK-W-17-802 which returned 24.9 g/t Au over 3.1 metres (previously released May 10, 2017).

OSK-W-17-825 returned three mineralized intervals in Lynx 1:  6.88 g/t Au over 2.2 metres (including 21.6 g/t Au over 0.4 metres);  23.8 g/t Au over 3.4 metres (including 92.1 g/t Au over 0.8 metres) where mineralization is composed of 5-6% of pyrite-tourmaline as disseminations or stringers within quartz-carbonate veins hosted in a silicified porphyric felsic intrusive; and 5.27 g/t Au over 2.7 metres, where mineralization is composed of 5-6% pyrite-tourmaline with quartz stringers within a sericitized and silicified porphyric felsic dike. This hole infilled between holes OSK-W-16-760 (93.3 g/t Au over 9.0 metres) and OSK-W-17-788 (17.0 g/t Au over 12.3 metres) previously released January 11, 2017 and April 5, 2017 respectively.

OSK-W-17-831 intersected Lynx 1 returning 4.61 g/t Au over 2.3 metres.  Mineralization is composed of up to 2% disseminated pyrite and pyrite stringers within a silicified smoky quartz – sericitized zone at the contact of a gabbro and a felsic volcanic unit.  This hole extended Lynx 1 200 metres east of previously reported OSK-W-17-799.

OSK-W-17-834 intersected a new mineralized zone in Lynx 2 returning 16.6 g/t Au over 2.4 metres. Mineralization is composed of 3% pyrite within silica flooding veins and within fractures in a silicified and sericitized rhyolite.  Previously reported assays (May 10, 2017) from this hole included 421 g/t Au over 3.7 metres (27.8 g/t Au over 3.7 metres cut).

OSK-W-17-836 intercepted four mineralized intervals in the Lynx Corridor 200 meters to the east and between 50 to 80 meters up dip from Lynx 1.  The first zone returned 4.65 g/t Au over 2.1 metres. The second zone assays 18.5 g/t Au over 2.5 metres including 85.2 g/t Au over 0.5 metres. The third zone returned 3.30 g/t Au over 2.3 metres. The fourth mineralized zone is pending results.  All four zones are composed of up to 3% disseminated pyrite in silica flooding bands within a rhyolite.  This interval is located south east of Lynx 1 and north of Lynx 4 and appears to be an emerging new Lynx Zone.

OSK-W-17-837 intersected three mineralized zones:  43.9 g/t Au over 3.4 metres (including 172 g/t Au over 0.4 metres (35.5 g/t Au over 3.4 meters cut); 16.8 g/t Au over 5.4 metres (including 45.7 g/t Au over 1.4 metres); and 42.7 g/t Au over 4.7 meters (including 95.3 g/t Au over 0.9 metres).  The high grade zones are composed of intense silica flooding with up to 15% disseminated pyrite with local visible gold.

Zone 27 Corridor

OSK-W-17-804 is an infill hole in the western part of Zone 27.  The hole returned 3.59 g/t Au over 2.0 metres (including 19.1 g/t over 0.3 metres) in the Zone 27 hanging wall.  Mineralization is composed of 5% disseminated pyrite, in fragments or in stringers hosted in a felsic dike.

OSK-W-17-824 returned 3.28 g/t Au over 2.0 metres.  Mineralization is composed of 5% pyrite in irregular stringers with moderate to strong sericitization which includes irregular veinlets of fuchsite and hosted in a felsic dike. The main Zone 27 returned 14.5 g/t Au over 3.0 metres including and interval of 1.26 kilograms/t Au over 0.4 metres (previously released May 3, 2017).

Caribou Corridor

OSK-W-17-813 intersected 4.16 g/t Au over 2.2 metres in the CS1 Zone.  Mineralization is composed of pyrite stringers in a bleached andesite.  This is an infill hole located 50 metres north-east of the OSK-W-16-706-W1 which returned 5.75 g/t Au over 16.5 meters (previously released September 19, 2016).

OSK-W-17-823 intersected 13.5 g/t Au over 7.1 metres (including 37.7 g/t Au over 2.0 metres) and 5.43 g/t Au over 2.1 metres in the Caribou Corridor. Mineralization is composed of up to 7% pyrite stringers. The first intersect is hosted in a strongly sericitized rhyolite and the second intersect his hosted at the contact between an andesite and a felsic porphyry dike.

OSK-W-17-823-W1 was a wedge hole intersected two intervals associated to Caribou Corridor. The CS1 Hanging Wall and the CS1 Main Zones returned 8.05 g/t Au over 5.4 metres (including 23.8 g/t Au over 1.3 metres) and 10.6 g/t Au over 2.4 metres (including 43.9 g/t Au over 1.0 metre) respectively.  Mineralization is composed of up to 5% disseminated pyrite, pyrite stringers and local ptygmatic tourmaline veins hosted in a silica-chlorite altered andesite in contact with a felsic porphyry dike. The second interval corresponds to CS1 30 metres south from OSK-W-17-789 which returned 5.12 g/t Au over 7.4 metres (previously released March, 21, 2017).

Underdog Corridor

OSK-EAG-13-502 was a continuation of an historic Eagle Hill drill hole, extended to test the Underdog Corridor.  New analytical results returned 37.9 g/t Au over 2.7 metres (including 134 g/t Au over 0.5 metres) (31.6 g/t Au over 2.7 meters cut) in a strongly sericitized andesite. The mineralization is principally composed of 2% disseminated pyrite with a 0.5 metre of semi-massive sulphide band and local visible gold.

OSK-W-17-466-W1 New analytical results returned 8.52 g/t Au over 5.2 metres, including 35.7 g/t Au over 1.0 metre, 12 metres uphole from the previous results released on May 19, 2017. The mineralization is  associated to the FW3 Upper Zone and composed of up to 5% disseminated pyrite in a silica-chlorite altered andesite. This intersect correlate 25 metres down plunge of OSK-W-17-466-W2, 26.6 g/t Au over 2.0 metres (released May 19, 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 width determinations are estimated at 65 – 80% true core lengths.  Assay are uncut except where indicated, and calculated intervals are reported over a minimum length of 2 metres using a lower cutoff of 3 g/t Au. All NQ core assays reported were obtained by either 1 kilogram whole rock metallic screen/fire assay or standard 50 gram fire-assaying with AA or gravimetric finish at ALS Laboratories in Val dOr, Québec or Sudbury, Ontario. The 1 kilogram metallic screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. All 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 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 Windfall Lake Gold Deposit
The Windfall Lake gold deposit is located between Val-dOr and Chibougamau in the Abitibi region of Québec, Canada. The current mineral resource 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 (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 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 Ontario.  Osisko continues to be well financed with approximately $190 million in cash and investments.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the Windfall Lake gold deposit being one of the highest grade resource-stage gold projects in Canada; the current 400,000 metre drill program at Red Dog; the significance of new results from the ongoing drill program at the Windfall Lake gold project; new analytics from the 19 intercepts in 10 new holes, two wedge drill holes and one extension of an historic drill hole focused on infill and expansion drilling in the main Windfall deposit; the significance of assay results presented in this press release; the type of drilling included in the drill program (definition drilling above Red Dog, expansion drilling above and below Red Dog, expansion drilling to the NE of the main deposit, and exploration drilling on the greater deposit and Urban-Barry project area); potential mineralization, including the multiple high grade intersections in the Lynx discovery corridor; 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 9.01 g/t Au Over 9.4 Metres At Windfall

(Toronto, May 19, 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 Windfall Lake gold project located in Urban Township, Québec.  The current 400,000 metre drill program combines definition drilling above the Red Dog intrusion (“Red Dog”), expansion drilling above and below Red Dog, expansion drilling to the NE of the main deposit, and exploration drilling on the greater deposit and Urban-Barry Project area.  Significant new analytical results from four wedge drill holes focused on infill and expansion drilling in the main Windfall deposit are reported in the table below.

Highlights from the new results include:  9.01 g/t Au over 9.4 metres in DDH OSK-W-17-807-W1; 26.6 g/t Au over 2.0 metres in DDH OSK-17-466-W2; and 14.6 g/t Au over 2.6 metres in DDH OSK-17-789-W1.  Maps showing drill 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-17-789-W1
1004.1
1006.7
2.6
14.6
 
FW3
Underdog
including
1005.2
1006.0
0.8
34.3
 
OSK-W-1c7-807-W1
907.0
916.4
9.4
9.01
 
FW3
Underdog
including
913.3
915.7
2.4
20.7
 
OSK-W-17-466-W1
736.0
738.4
2.4
8.38
 
FW3U
Underdog
including
737.5
738.4
0.9
20.3
 
OSK-W-17-466-W2
721.0
723.0
2.0
26.6
 
FW3U
Underdog
including
721.3
722.3
1.0
51.5
 

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-W-17-466-W1
330
-52
861
452484
5434643
2600
OSK-W-17-466-W2
330
-52
900
452484
5434643
2575
OSK-W-17-789-W1
333
-59
1198.5
452546
5434390
2525
OSK-W-17-807-W1
330
-65
1195.5
452311
5434424
2325

 

OSK-W-17-789-W1 returned 14.6 g/t Au over 2.6 metres including 34.3 g/t Au over 0.8 metres from a strongly silicified large quartz eyes felsic porphyry dikes. The mineralization includes up to 5% pyrite stringers, 1% chalcopyrite and local visible gold.  This intersection infills the FW3 Zone 45 metres south-west of previously reported EAG-12-320 (16.3 g/t Au 2.5 metres).

OSK-W-17-807-W1 is an infill hole on the FW3 Zone which returned 9.01 g/t Au over 9.4 metres including an interval returning 20.7 g/t Au over 2.4 metres.  Mineralization consists of up to 4% pyrite in stringers and disseminations within a fragmental porphyry dike.  This infill hole is an extension 45 metres to the north-east from previously reported hole EAG-11-311 (24.5 g/t Au over 7.4 metres).

OSK-W-17-466-W1 intersected 8.38 g/t Au over 2.4 metres including 20.3 g/t Au over 0.9 metres associated to the FW3 Upper Zone.  The mineralization is composed of up to 3% pyrite stringers and quartz tourmaline veins hosted in a silica altered andesite.  The hole is 25 metres down plunge of OSK-W-17-466-W2 (described below) and 25 metres north-east of previously reported hole EAG-11-269 (7.71 g/t Au over 6.9 metres).

OSK-W-17-466-W2 intersected 26.6 g/t Au over 2.0 metres including 51.5 g/t Au over 1 metre. Mineralization is composed of semi-massive pyrite (up to 40% in stringer texture) hosted in a bleached andesite at the contact of a felsic porphyry dike. This intersection extends the FW3 Upper Zone 30 metres north-east of previously reported hole EAG-11-289 (9.96 g/t Au over 5.8 metres).

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 width determinations are estimated at 65 – 80% true core lengths.  Assay are uncut except where indicated, and calculated intervals are reported over a minimum length of 2 metres using a lower cutoff of 3 g/t Au. All NQ core assays reported were obtained by either 1 kilogram whole rock metallic screen/fire assay or standard 50 gram fire-assaying with AA or gravimetric finish at ALS Laboratories in Val dOr, Québec or Sudbury, Ontario. The 1 kilogram metallic screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. All 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 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 Windfall Lake Gold Deposit
The Windfall Lake gold deposit is located between Val-dOr and Chibougamau in the Abitibi region of Québec, Canada. The current mineral resource 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 (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 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 Ontario.  Osisko continues to be well financed with approximately $190 million in cash and investments.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the Windfall Lake gold deposit being one of the highest grade resource-stage gold projects in Canada; the current 400,000 metre drill program at Red Dog; the significance of new results from the ongoing drill program at the Windfall Lake gold project; new analytics from the four drill holes focused on the Lynx Zone discovery; the significance of assay results presented in this press release; the type of drilling included in the drill program (definition drilling above Red Dog, expansion drilling above and below Red Dog, expansion drilling to the NE of the main deposit, and exploration drilling on the greater deposit and Urban-Barry project area); potential mineralization, including the recently discovered Lynx and Lynx 4 Zone; 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 Announces Shareholder Meeting And Mailing Of Materials

(Toronto, May 15th, 2017)  Osisko Mining Inc. (OSK:TSX, “Osisko” or the “Corporation”) is pleased to announce that it has mailed materials relating to its Annual and Special Meeting of shareholders (the “Meeting”) being held on June 8, 2017 at 10 a.m. (Toronto Time).

Shareholders of Osisko are being asked to vote on the election of Directors, reappoint PricewaterhouseCoopers LLP as auditors and approve the Corporation’s incentive plans. The Board of Directors recommends a vote in favour of all proposed resolutions.

Materials for the Meeting, including Osiskos management proxy circular (the “Proxy Circular”), have been filed under the Corporations profile on SEDAR at www.sedar.com and are also available on the Corporations website at www.osiskomining.com. Shareholders of Osisko are encouraged to read the Proxy Circular in detail and vote well in advance of the proxy cut-off time on June 6, 2017 at 10 a.m. (Toronto Time).

Shareholder Questions

Shareholders who have any questions or require assistance with voting may contact Osiskos Proxy Solicitation Agent:

Laurel Hill Advisory Group
Toll Free: 1-877-452-7184
International: +1 416-304-0211 outside Canada and the US
By Email: assistance@laurelhill.com

Osisko Intersects 11.7 g/t Au Over 7.7 Metres In New Lynx 4 Discovery

Bonanza Grade Intercept of 421 g/t Au over 3.7 Metres in Lynx 2

(Montréal, May 10, 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 Windfall Lake gold project located in Urban Township, Québec.  The current 400,000 metre drill program combines definition drilling above the Red Dog intrusion (“Red Dog”), expansion drilling above and below Red Dog, expansion drilling to the NE of the main deposit, and exploration drilling on the greater deposit and Urban-Barry Project area.  Significant new analytical results from five drill holes focused on infill and expansion drilling in the Lynx Corridor are reported in the table below.

Highlights from the new results include:  421 g/t Au over 3.7 metres, including 3.74 kilograms/t Au over 0.4 metres containing spectacular visible gold (27.8 g/t Au over 3.7 metres cut to 100g/t) in DDH OSK-W-17-834; 11.7 g/t Au over 7.7 metres in Lynx 4 discovery DDH OSK-17-816; and 10.4 g/t Au over 4.9 metres in DDH OSK-17-802.  Maps showing drill 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-17-802 293.1 298.0 4.9 10.4   Lynx 2 Lynx
including 297.0 298.0 1.0 37.5  
OSK-W-17-806 214.6 217.5 2.9 3.13   Lynx 2 Lynx
including 214.6 215.5 0.9 8.24  
OSK-W-17-816 797.1 804.8 7.7 11.7   Lynx 4 Lynx
including 799.3 800.0 0.8 68.3  
including 804.5 804.8 0.3 85.9  
OSK-W-17-825 267.9 270.7 2.8 6.71   Lynx 1 Lynx
including 268.9 269.6 0.7 21.6  
OSK-W-17-834 292.0 295.7 3.7 421 27.8 Lynx 2 Lynx
including 293.1 293.5 0.4 3740 100

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-W-17-802 330 -54 400.5 453376 5434896 3475
OSK-W-17-806 331 -60 388.5 453261 5434949 3400
OSK-W-17-816 147 -69 1051.5 453470 5435215 3725
OSK-W-17-825 145 -54 579 453252 5435182 3525
OSK-W-17-834 144 -59 402 453247 5435189 3525

OSK-W-17-802 returned 10.4 g/t Au over 4.9 metres including 37.5 g/t Au over 1.0 metre from crustiform veins cross-cutting the Lynx 2 Zone. Mineralization is composed of up to 5% disseminated pyrite, 3% pyrite stringers and up to 2% sphalerite associated to strong grey silica alteration.  Visible gold is hosted in a quartz tourmaline vein in the felsic volcanic package.  This hole is a 25 metre step-out eastward of drill holes OSK-W-17-825 and OSK-W-17-834 described below.

OSK-W-17-806 intersected Lynx 2 in a strongly sericitized and silicified felsic volcanic.  The intercept averaged 3.13 g/t Au over 3.9 metres (including 8.24 g/t Au over 0.9 metres). Mineralization is composed of 3% pyrite stringers. This intercept is located 60 metres under drill hole OSK-W-16-755, which returned 8.12 g/t Au over 2.0 metres (previously released January 11, 2017).

OSK-W-17-816 intersected a new zone averaging 11.7 g/t Au over 7.7 metres including 85.9 g/t Au over 0.3 metres (the “Lynx 4” Zone).  Lynx 4 is 170 metres south of Lynx 1.  Mineralization consists of up to 15% pyrite, disseminated and stringers, with visible gold grains associated with pyrite clusters.

OSK-W-17-825 intersected 6.71 g/t Au over 2.8 metres (including 21.6 g/t Au over 0.7 metres) in Lynx 1.  Mineralization is composed of 8% pyrite at the contact between a fragmental porphyry dike and a strongly silicified rhyolite. This hole is an infill between OSK-W-16-760 (93.3 g/t Au over 9.0 metres uncut) and OSK-W-17-788 (17.0 g/t Au over 12.3 metres) previously released January 11 and April 5, 2017 respectively.

OSK-W-17-834 returned of 421 g/t Au over 3.7 metres (27.8 g/t Au over 3.7 metres cut), including 3.74 kilograms/t Au over 0.4 metres (uncut) in Lynx 2.  The intercept contains local spectacular visible gold as patches and fracture fillings in smoky quartz-tourmaline veins hosted in a strongly sericitized and grey silicified rhyolite.  This intercept is located 50 metres under OSK-16-760 which returned 95.3 g/t Au over 9.0 metres (previously released January 11, 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 width determinations are estimated at 65 – 80% true core lengths.  Assay are uncut except where indicated, and calculated intervals are reported over a minimum length of 2 metres using a lower cutoff of 3 g/t Au. All NQ core assays reported were obtained by either 1 kilogram whole rock metallic screen/fire assay or standard 50 gram fire-assaying with AA or gravimetric finish at ALS Laboratories in Val dOr, Québec or Sudbury, Ontario. The 1 kilogram metallic screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. All 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 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 Windfall Lake Gold Deposit
The Windfall Lake gold deposit is located between Val-dOr and Chibougamau in the Abitibi region of Québec, Canada. The current mineral resource 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 (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 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 Ontario.  Osisko continues to be well financed with approximately $190 million in cash and investments.

Cautionary Note Regarding Forward-Looking Information
This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the Windfall Lake gold deposit being one of the highest grade resource-stage gold projects in Canada; the current 400,000 metre drill program at Red Dog; the significance of new results from the ongoing drill program at the Windfall Lake gold project; new analytics from the four drill holes focused on the Lynx Zone discovery; the significance of assay results presented in this press release; the type of drilling included in the drill program (definition drilling above Red Dog, expansion drilling above and below Red Dog, expansion drilling to the NE of the main deposit, and exploration drilling on the greater deposit and Urban-Barry project area); potential mineralization, including the recently discovered Lynx and Lynx 4 Zone; 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 936 g/t Au Over 2.5 Metres At Windfall

Hole Number Azimuth
(°)
Dip
(°)
Length
(m)
UTM E UTM N Section
OSK-W-17-807 329.7 -65.2 1171.5 452311 5434424 2325
OSK-W-17-812 330.2 -64.8 379.2 453461 5435034 3625
OSK-W-17-816 147.1 -69.1 1051.5 453469.6 5435215.2 3722
OSK-W-17-817 144.7 -60.4 821.8 453334 5435231.2 3609
OSK-W-17-820 333 -65.2 1105.5 452669 5434484 2667
OSK-W-17-824 330.2 -67.2 220.0 451948 5434608 2099
OSK-W-17-827 144.9 -63.2 957.0 453173 5435126 3418
OSK-W-17-832 145.5 -54.5 573.0 453332 5435229 3609