Osisko Sponsors Search For Avro Arrow Artifacts

Canada 150 Project to Find and Recover Lost Arrow Free Flight Models

(Toronto, July 14, 2017)  Osisko Mining Inc. (OSK:TSX, “Osisko” or the “Corporation”)  is proud to announce that it is a participating sponsor in the search for and recovery of nine Avro Arrow free flight models launched over Lake Ontario in series of tests during 1954 – 1957.  The models are one-eighth scale replicas of the famed flying jet, and were part of the final flight design test work done prior to the production of the CF-105 Arrow.  The goal of the search is to discover the resting place of the nine models, recover and ultimately house them at the Canada Aviation and Space Museum in Ottawa and the National Air Force Museum of Canada in Trenton, Ontario. 

The search and recovery program is a Canada 150 collaborative effort spearheaded by OEX Recovery Group Incorporated, sponsored by Osisko group companies Osisko Mining Inc. and Osisko Gold Royalties Ltd., in collaboration with their financial partners at National Bank, the Bank of Montreal, Canaccord Genuity, Maxit Capital, Eight Capital and Northfield Capital; the Canada Aviation and Space Museum (CASM), Royal Canadian Air Force (RCAF), the Canadian Conservation Institute, and Bennett Jones LLP.  Support for this project is also being provided by Scarlett Janusas Archaeology, Canadian Coast Guard, the Royal Canadian Military Institute and Canada Company.

Later this month Kraken Sonar Inc. of St. John’s (PNG:TSXV) will deploy its ThunderFish® Autonomous Underwater Vehicle and AquaPix® Synthetic Aperture Sonar system in Lake Ontario to search for the scale models of the Avro Arrow.  The highly-advanced Canadian jet fighter and development program was abruptly cancelled in 1959.

The CF-105 Arrow performed well during in-flight tests and many thought it would put Canada at the forefront of military aviation.  When the program was cancelled in 1959, over 30,000 employees and sub-contractors lost their jobs as a direct result of the program’s cancellation.  Many Avro engineers went on to work at Lockheed, Boeing, and NASA, and others to Britain, often cited as an example of Canadian Brain Drain.  All materials related to the Avro Arrow were ordered destroyed, including six completed jet fighters, production tooling, and development-related materials.  The only known artifacts from the program remaining to be found are the free flight test models, which for over sixty years have rested somewhere on the bottom of Lake Ontario.   For Avro Arrow historians, the roughly one-eighth size models are something of a holy grail, since they were the flying replicas of the actual aircraft and the last step from design testing prior to production of the actual flying jets.

The free flight models were launched over Lake Ontario in a series of flights conducted between 1954 and 1957 to test the aerodynamic qualities of the aircraft design prior to a production model and were successively increased in sophistication.

The free flight models were attached to high-powered booster rockets launched out over the lake from a military test site east of Toronto.  After separating from the booster rockets the models flew at supersonic speeds. Their onboard sensors, revolutionary for the 1950s, transmitted flight data back to engineers on the ground.  At the end of each flight the models lost velocity, crashed into the water and sank.

In the past, privately funded missions have attempted to locate and recover the lost models, but all have failed due inadequate funding, water depths, search area size and the amount of metal debris on the bottom – according to military records, more than 600 missiles were launched from the same site, which was also used as an artillery range in the 1930’s.

This summers search for the Avro Arrow free flight models can be likened to the hunt for Sir John Franklin’s lost ships.  The first vessel – the HMS Erebus – was discovered in September 2014 by a Canadian expedition team that included participation by Kraken engineers and its AquaPix® Synthetic Aperture Sonar technology.  However, the Arrow free flight models are far smaller targets.  While the full-size Arrow measured 24 metres long with a 15-metre wingspan, each free flight test model was just 3 metres long with a wingspan of 2 metres.

Like the hunt for Franklin’s lost ships, the search for the Arrow free flight models began with detailed analysis of historical information to narrow the search area as much as possible.  In the Arrow’s case, scientists, engineers and historians from the Osisko group, Kraken and the RCAF used historical research, the collection of archival material at CASM, interviews with former Avro employees and computer-aided ballistic trajectory and flight data modeling to develop the search grids.

John Burzynski, President and CEO of Osisko Mining Inc. stated: “As professional explorers in the mining business, we initiated this program about a year ago with the idea of bringing back a piece of lost Canadian history to the Canadian public.  As individuals, as a company, as a group, and with our partners and our project participants in this search effort, we all have the same goal in mind:  to find and return these beautiful pieces of Canadian technology to the public eye, during this anniversary year of our incredible country.  Like Avro, our own corporate group was built on dreams, and this project is a proud reminder of what we as Canadians have done, what we Canadians do, and what we Canadians can do.”

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 and Quévillon areas(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 Corporation also holds interests and options in a number of additional properties in northern Ontario and Québec.  Osisko continues to be well financed with approximately $190 million in cash and investments.

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

Osisko Intersects 12.5 g/t Au Over 8.5 Metres At Windfall

12.4 g/t Au Over 5.0 Metres at Lynx

(Toronto, June 7, 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 assay results from fifteen intercepts in eleven drill holes focused on infill and expansion drilling in the high-grade Lynx discovery and the main Windfall deposit are reported in the table below.

Highlights from the new results include:  12.5 g/t Au over 8.5 metres in DDH OSK-OBM-16-667 in the Underdog Corridor and 12.4 g/t Au over 5.0 metres in DDH OSK-W-17-805 in Lynx 2 and 15.9 g/t Au over 3.0 metres in DDH OSK-EAG-13-504 in a new extension of the Wolf Zone in the Caribou 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-17-805
225.5
230.5
5.0
12.4
 
Lynx 2
Lynx
including
227.4
230.5
3.1
17.7
 
including
230.0
230.5
0.5
64.6
 
OSK-W-17-816
192.5
194.5
2.0
9.46
 
Lynx 1 HW
Lynx
including
192.5
193.5
1.0
18.7
 
OSK-W-17-827
160.0
162.1
2.1
22.5
 
Lynx 3
Lynx
including
160.0
161.5
1.5
30.0
 
OSK-W-17-837
343.7
346.6
2.9
15.6
 
VNCR
Lynx
OSK-W-17-839
310.0
312.1
2.1
10.5
 
Lynx HW
Lynx
including
310.8
311.7
0.9
17.9
 
OSK-EAG-13-504
746.9
749.9
3.0
15.9
 
Wolf
Caribou
 
753.0
755.1
2.1
4.22
 
OSK-OBM-16-667
660.5
669.0
8.5
12.5
 
FW3
Underdog
including
663.0
665.0
2.0
37.4
 
including
663.0
664.2
1.2
50.1
 
OSK-W-17-789-W2
882.0
884.3
2.3
5.00
 
FW1
Underdog
 
906.5
909.2
2.7
4.79
 
FW1 FW
 
1014.0
1017.0
3.0
8.03
 
Z2
OSK-W-17-807-W2
1070.5
1072.5
2.0
4.29
 
Underdog
Underdog
including
1070.5
1071.5
1.0
8.20
 
OSK-W-17-821
975.1
977.3
2.2
5.25
 
FW0 FW
Underdog
including
976.1
976.7
0.6
15.4
 
OSK-W-17-826
937.0
939.0
2.0
3.79
 
FW0
Underdog
 
1316.6
1319.0
2.4
16.0
 
Z14 FW
including
1317.2
1319.0
1.8
21.3
 

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-16-667
330
-55
852
452410
5434597
2500
OSK-W-17-789-W2
332
-59
1195.5
452546
5434388
2525
OSK-W-17-805
332
-56
322.5
453200
5434910
3350
OSK-W-17-807-W2
320
-58
1156.5
452306
5434421
2325
OSK-W-17-816
147
-69
1051.5
453470
5435215
3725
OSK-W-17-821
334
-66
1258.6
452738
5434475
2700
OSK-W-17-826
330
-67
1335
452799
5434556
2825
OSK-W-17-827
145
-63
957
453173
5435126
3525
OSK-W-17-837
332
-75
465
453483
5435060
3925
OSK-W-17-839
331
-56
449.2
453431
5434888
3525
OSK-EAG-13-504
331
-62
810
452769
5434575
2800

 

Lynx Corridor

OSK-W-17-805 returned 12.4 g/t Au over 5.0 metres (including 17.7 g/t Au over 3.1 metres and 64.6 g/t Au over 0.5 metre).  Mineralization is associated with 5 to 10% quartz-carbonate veins (locally crustiform) and consists of trace to 1% disseminated pyrite, trace to 1% pyrite within pyrite-tourmaline stringers, and trace to 1% pyrite associated with quartz-carbonate veins.  Local visible gold was observed in quartz-carbonates veins with 5 to 20% pyrite (+/- tourmaline).  The host rock is a sericitized and silicified rhyolite.  The intersection represents the Lynx 2 Zone, extending it 130 metres below and 30 metres west of previously released OSK-W-16-761 (71.3 g/t Au over 2.3 metres).

OSK-W-17-816 returned 9.46 g/t Au over 2.0 metres (including 18.7 g/t Au over 1.0 metre).  Mineralization consists of trace to 2% pyrite with disseminated tourmaline and occurs at a moderately sericitized contact between a small quartz porphyritic intrusive with a felsic volcanic unit.  This interval extends the Lynx 1 HW Zone 75 metres northeast of OSK-W-17-837 (43.9 g/t Au over 3.4 metres previously released May 24, 2017).

OSK-W-17-827 returned 22.5 g/t Au over 2.1 metres (including 30.0 g/t Au over 1.5 metres) in the Lynx 3 Zone.  Mineralization consists of trace to 3% pyrite disseminated within a fragmental felsic intrusive with local silica flooding.

OSK-W-17-837 returned 15.6 g/t Au over 2.9 metres.  Mineralization consists of 2 to 5% disseminated to massive pyrite within 50% veins and veinlets (quartz-tourmaline and quartz-carbonate) which crosscut a strongly altered gabbro.  This interval is located within the Lynx Corridor, 50 metres below OSK-W-17-799 (11.0 g/t Au over 6.5 metres previously released April 5, 2017).
OSK-W-17-839 returned 10.5 g/t Au over 2.1 metres (including 17.9 g/t Au over 0.9 metres).  Mineralization consists of 8 to 10 % disseminated pyrite, 5% pyrite stringers and 1 to 2% ptygmatic quartz-tourmaline veins, located within the hanging wall of Lynx 1 Zone, 16 metres below OSK-W-17-825 (5.27 g/t Au over 2.7 metres previously released May 24, 2017).

Underdog Corridor

OSK-OBM-16-667 is an extension of previously drilled hole OBM-16-667, intersecting the FW3U Zone.  The hole returned 12.5 g/t Au over 8.5 metres (including 37.4 g/t Au over 2.0 metres and 50.1 g/t Au over 1.2 metres).  Mineralization consists of 3 to 7% pyrite stringers and 3 to 5% disseminated pyrite associated with rhyolite cut by crustiform veins and patches of silica flooding.  Mineralization remains open in the hanging-wall of FW3U and is interpreted to represent new mineralization in the increasingly large FW3 corridor.  This new intercept is located 120 metres southwest of OSK-W-16-704-W1 (15.5 g/t Au over 2.9 metres previously released October 25, 2016).

OSK-W-17-789-W2 returned two intersections in the FW1 Zone:  5.00 g/t Au over 2.3 metres and 4.79 g/t Au over 2.7 metres, infilling the zone 40 metres to the southeast of OSK-W-17-789 (16.4 g/t Au over 7.9 metres previously released April 11, 2017).  The FW3 intersection returned 8.03 g/t Au over 3.0 metres, located 30 meters east of previously released OSK-W-17-789-W1 (14.6 g/t Au over 2.6 metres).   Mineralization consists of trace to 10% pyrite-tourmaline stringers, 2 to 3% disseminated pyrite and occurs in felsic porphyry with large quartz eyes.

OSK-W-17-807-W2 intersected 4.29 g/t Au over 2.0 metres (including 8.20 g/t Au over 1.0 metre) between Zones FW3 and FW4.  Mineralization consists of up to 10% pyrite-tourmaline stringers with 1% chalcopyrite hosted in an altered felsic intrusive dike.  This intersection is located 40 metres west of OSK-W-16-311-W2 (5.21 g/t Au over 2.7 metres previously released November 8, 2016).

OSK-W-17-821 returned 5.25 g/t Au over 2.2 metres (including 15.4 g/t Au over 0.6 metres).  Mineralization consists of 10 to 15% pyrite-tourmaline stringers or irregular clusters with a low core angle and a strong silicified halo.  The host rock is a moderate to strongly altered fragmental porphyry dike.

OSK-W-17-826 returned two intersections: 3.79 g/t over 2.0 metres and 16.0 g/t Au over 2.4 metres (including 21.3 g/t Au over 1.8 metres).  These mineralized intervals contain up to 5% disseminated pyrite and 5 to 10% pyrite in stringers and are hosted in a strongly bleached and sericitized andesite.  The first intercept extends the FW0 Zone 40 metres to the northeast of OBM-16-614 (11.2 g/t Au over 3.4 metres previously released April 14, 2017).  The second intercept is an extension of FW3 Zone.

Caribou Corridor

OSK-EAG-13-504 intersected the Wolf Zone returning 15.9 g/t over 3.0 metres (and 4.22 g/t Au over 2.1 metres).  Mineralization comprises 10 to 15% pyrite-tourmaline stringers within a small quartz eye porphyritic intrusive.  This intersection is located 25 metres northeast of OBM-15-559 (7.00 g/t Au over 10.0 metres, previously released January 14, 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 and Quévillon areas(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 Corporation also holds interests and options in a number of additional properties in northern Ontario and Québec.  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 Submits Project Description And Preliminary Project Information For Windfall

Receives Authorization to Begin Ramp Dewatering

(Toronto, June 6, 2017).  Osisko Mining Inc. (OSK:TSX, “Osisko” or the “Corporation”) is pleased to announce that it has filed the Project Description with the federal government (Canadian Environmental Assessment Agency or “CEAA”) and the Preliminary Project Information with the Québec government (Ministère du Développement durable, de lEnvironnement et de la Lutte contre les changements climatiques or “MDDELCC”) for the Windfall Lake project.  The Project Description report is available at www.osiskomining.com. Following review of both documents, CEAA and MDDELCC will provide Osisko with guidelines for executing the project impact assessment.

John Burzynski, President and CEO of Osisko commented:  “Submission of the Project Description and the Preliminary Project Information to the federal and provincial governments represents the first step in the Environmental Approval Processes for Windfall.  We look forward to consulting with all stakeholders as the design of the Windfall Lake project evolves.”

Osisko also received approval from the MDDELCC for the mine water treatment system.  This certificate of authorization (CA) allows Osisko to begin dewatering the previously existing ramp in order to conduct advanced exploration, through extending the ramp that was commenced by previous operators. 

Mr. Burzynski continued:  “Receipt of the CA for the ramp dewatering activities is an exciting step in the advancement of the next phase of exploration.  After rehabilitation of the existing ramp, it will allow us to continue to drive forward into the mineralized zones, as well as conduct further exploratory drilling from underground in conjunction with the surface drilling program.”

The Corporation is currently evaluating the Windfall Lake gold project as a potential underground mining operation.  Osisko is well-funded with approximately $190 million in cash and equity investments, and is carrying out an intensive definition drilling and large-scale exploration campaign on Windfall and the surrounding area.  An updated NI 43-101 resource estimate on the Windfall Lake project is planned for release in the second half of 2017.  Osisko has commenced collection of environmental baseline data in the vicinity of Windfall and intends to collect additional data along the potential haul road and around the proposed  site of a mill complex near an existing industrial property (the former Domtar Corporation pulp and paper mill) in Lebel-sur-Quévillo, Québec (the “Site”).

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 and Lebel-sur-Quévillon areas, a 100% interest in the Marban project located in the heart of Québecs prolific Abitibi gold mining district, and properties in Ontario, including the Jonpol and Garrcon deposits on the Garrison property. Osisko continues to be well financed with approximately $190 million in cash and investments.  Osisko Gold Royalties Ltd. (OR:TSX / NYSE) is a significant shareholder of the Corporation with approximately 14% ownership.

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. 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 timing to obtain feedback, and the nature of the feedback to be received, in relation to the Project Description filed with the federal government (Canadian Environmental Assessment Agency) and the Project Notice filed with the provincial government (Ministère du Développement durable, de lEnvironnement et de la Lutte contre les changements climatiques); feasibility of the Site as a potential mill complex to process mineralized material (if any) from the Windfall Lake gold deposit; the timing and ability to evaluate, if at all, the Site location through the environmental assessment process and to prepare, if at all, feasibility studies for the Windfall Lake gold project; the Site being located on Crown land; the advantages, if any, of the Site over construction at Windfall Lake; receipt of the CA for the ramp dewatering activities in relation to the next phase of exploration, including further exploratory drilling from underground in conjunction with the surface drilling program; the timing and ability, if at all, to extend the ramp and conduct advanced exploration;  the timing and ability if at all, to prepare a technical report in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects in respect of a resource estimate on the Windfall Lake gold project; the use of environmental baseline data; the ability of Osisko to complete further exploration activities; 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.  This news release has been translated into French. Any discrepancies between the English and French versions of this news release, including in this “Cautionary Note Regarding Forward-Looking Information”, shall be resolved in favour of the English version.

CONTACT INFORMATION:
John Burzynski
President & Chief Executive Officer
(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

Osisko Completes Acquisition Of Land Package Near Lebel-Sur-Quévillon, Québec

(Montréal, April 27, 2017). Osisko Mining Inc. (OSK:TSX, “Osisko” or the “Corporation”) is pleased to announce, further to its announcement on March 15, 2017, that it has acquired an additional land package in the area of Lebel-sur-Quévillon, Québec (the “Additional Quévillon Claims”) from Deloitte Restructuring Inc., acting as trustee in bankruptcy for the assets, undertakings and properties of  Maudore Minerals Ltd. With the acquisition of the Additional Quévillon Claims, Osisko now holds a total of 4,150 claims covering a 216,000 hectare (2,160 square kilometres) land package (the “Quévillon Project”).

The Quévillon Project includes approximately 30 known gold showings as well as the historical Osbell gold deposit, which is located 17 kilometres northwest of the town of Lebel-sur-Quévillon and 112 kilometres west of the Windfall Lake gold deposit. The Osbell deposit has been the object of significant historical drilling over the past fifteen years, and will be the focus of new drilling and resource re-evaluation by Osisko.

Osisko acquired the Additional Quévillon Claims in exchange for $1 million in cash and 100,000 common shares of the Corporation payable to FBC Holdings SARL, the secured creditor over the Additional Quévillon Claims. The listing of the common shares of the Corporation to FBC Holdings SARL remains subject to the final approval of the Toronto Stock Exchange, and such shares will be subject to a hold period expiring four months and one day from the date hereof.

Qualified Person
The scientific and technical content of this press release has been reviewed by Mr. Robert Wares, P.Geo. Executive Vice President Exploration for Osisko Mining Inc., a “qualified person” as defined by National Instruments 43-101 – Standards of Disclosure for Mineral Projects.

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 $195 million in cash and investments (after giving effect to the closing of the offering announced earlier today by the Corporation).

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. 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 timing and ability, if at all, to transfer the Additional Quévillon Claims to Osisko; the timing and ability, if at all, to obtain final listing approval of the Toronto Stock Exchange for the issuance of 100,000 common shares of the Corporation to FBC Holdings SARL; the potential, if any, of the Additional Quévillon Claims; the prospectivity and potential of the regional land package in the area of Lebel-sur-Quévillon, Québec; the Additional Quévillon Claims being a high-potential gold target in the immediate area of the historical Osbell deposit; the ability of Osisko to complete further exploration activities, including drilling; property interests in Québec; 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.

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

Osisko Mining Completes $5 Million Financing Of Flow-Through Shares For Ontario Exploration Properties

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

(Toronto, April 27, 2017) Osisko Mining Inc. (TSX:OSK) (“Osisko” or the “Corporation”) is pleased to announce, further to its announcements on April 18, 2017, that the Corporation has completed a private placement financing of 700,000 flow-through common shares of the Corporation (the “Flow-Through Shares”) at a price of $7.15 per Flow-Through Share, for aggregate gross proceeds of $5,005,000 (the “Offering”). The Offering was underwritten by Canaccord Genuity Corp. and Eight Capital, as co-lead underwriters.

The Corporation intends to use the gross proceeds of the Offering to fund “Canadian exploration expenses” (within the meaning of the Income Tax Act (Canada)) related to Osiskos projects in the Province of Ontario, specifically the Jonpol and Garrcon deposits on the Garrison property located in the Larder Lake Mining Division in northeast Ontario.

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.

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 $195 million in cash and investments (after giving effect to the Offering).

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 and projections as at the date of this news release. The information in this news release about the Offering; the timing and ability of the Corporation to complete the formal documentation and obtain the final listing approval of the Toronto Stock Exchange, if at all; the use of the gross proceeds from the Offering; that the gross proceeds of the Offering will be used for “Canadian exploration expenses” (as defined in subsection 66.1(6) of the Income Tax Act (Canada)) related to Osiskos project in the Province of Ontario, specifically the Jonpol and Garrcon deposits on the Garrison property located in the Larder Lake Mining Division in northeast Ontario; that all such “Canadian exploration expenses” will be renounced with an effective date no later than December 31, 2017; 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, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as “expects”, or “does not expect”, “is expected”, “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 Osisko, 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 Offering; volatility in the trading price of common shares of the Corporation; risks relating to the ability of the Corporation to obtain required approvals, including the final approval of Toronto Stock Exchange; ability of Osisko to complete further exploration activities, including drilling; property interests; 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 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
Osisko Mining Inc.
Telephone: (416) 363-8653

Osisko Intersects 35.2 g/t Au Over 2.8 Metres At Windfall

New High Grade Intercepts in Lynx Discovery

(Montréal, April 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 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 analytical results from eight drill holes focused on infill and expansion drilling in the Lynx discovery as well as the Caribou, Underdog and the 27 zones are reported in the table below.

Highlights from the new results include:  35.2 g/t Au over 2.8 metres in hole OSK-W-17-800; 10.5 g/t Au over 8.6 metres in hole OSK-W-17-790; 18.6 g/t Au over 4.1 metres in hole OSK-W-17-812 and 11.0 g/t Au over 3.5 metres in hole OSK-W-17-89-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) Au (g/t)  cut to 100 g/t Zone Corridor
OSK-W-17-790 293.0 295.0 2.0 8.61   Lynx 2 Lynx
  303.8 308.8 5.0 6.00   Lynx 2 Lynx
  316.9 325.5 8.6 10.5 10.3 Lynx 2 Lynx
including 324.8 325.5 0.7 102 100    
  392.5 394.7 2.2 10.9   VNCR Lynx 
OSK-W-17-800 193.6 196.0 2.4 16.5   Lynx 1 Lynx
including 194.1 195.0 0.9 40.4    
  306.0 308.8 2.8 35.2 25.4 VNCR Lynx
including 306.5 307.2 0.7 139  100  
OSK-W-17-811 152.5 156.0 3.5 3.01   Lynx 1 Lynx
OSK-W-17-812 304.8 308.9 4.1 18.6 12.5 Lynx 2 Lynx
including 304.8 305.1 0.3 59.7    
including 307.3 307.6 0.3 184  100  
OSK-W-17-804 83.9 86.6 2.7 3.65   27 Zone 27
including 86.3 86.6 0.3 27.4    
OSK-W-17-810 93.1 98.0 4.9 7.25   HW Zone 27
including 93.8 95.7 1.9 16.4    
  108.7 111.0 2.3 6.54   27 Zone 27
including 109.2 110.2 1.0 14.9    
OSK-W-17-789 964.0 966.3 2.3 8.20   FW3 Underdog
including 965.0 965.3 0.3 61.7    
OSK-W-17-789-W1 799.5 804.4 4.9 5.63   FW0 Underdog
including 801.9 802.5 0.6 20.4    
  877.1 880.6 3.5 11.0     Underdog 

Notes:

  1. True Widths for Caribou and Underdog Corridors are estimated at 65 – 80% of the reported core length interval.  True widths in the Lynx Zone are yet to be determined.  See “Quality Control” below.
  2. Definitions:  HW = hanging wall; VNCR = crustiform vein. 
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-W-17-789 331 -58 1279.5 452546 5434390 2500
OSK-W-17-789-W1 331 -58 1198.5 452546 5434390 2500
OSK-W-17-790 332 -64 451.5 453456 5434998 3600
OSK-W-17-800 330 -58 415.5 453366 5434943 3500
OSK-W-17-804 343 -43 201.0 451941 5434625 2100
OSK-W-17-810 335 -59 225.0 451949 5434615 2100
OSK-W-17-811 150 -75 433.5 453469 5435216 3725
OSK-W-17-812 330 -65 379.2 453461 5435034 3625

Lynx Corridor

OSK-W-17-790 intersected Lynx 2 in three intervals approximately 40 metres above and 40 metres to the SW of previously reported OSK-W-17-799 (63.8 g/t Au over 4.4 metres). The first two intervals returned 4.62 g/t Au over 4.3 metres and 6.00 g/t Au over 5.0 metres respectively. Mineralization consists of silicified pyrite-rich bands hosted in a sericitized rhyolite. The third interval returned 10.52 g/t Au over 8.6 metres, including 102 g/t Au over 0.7 metres.  Mineralization consists of 3-5% pyrite stringers.  An interval containing crustiform veins was also intersected which returned 10.9 g/t Au over 2.2 metres in stringers containing up to 3% pyrite.

OSK-W-17-800 returned 16.5 g/t Au over 2.4 metres including 40.4 g/t Au over 0.9 metres from Lynx 1.  Gold mineralization is associated with 5-7% pyrite stringers and strong silica flooding with local visible gold.  This interval is located between two previously reported intersections, OSK-W-17-803 (19.1 g/t Au over 2.9 metres) 51 metres SW up plunge, and 60 metres down plunge NE of OSK-W-16-760 (95.3 g/t Au over 9.0 metres).  A second intercept returned 35.2 g/t Au over 2.8 metres (25.4 g/t Au over 2.8 metres cut to 100 g/t) from a smoky quartz vein containing local visible gold.  The vein is hosted in a tourmaline breccia containing 2-3% of pyrite stringers.  This interval is located 48 metres to the NE of previously reported OSK-W-17-779 (21.6 g/t Au over 7.9 metres).

OSK-W-17-811 intersected shallow mineralization returning 3.01 g/t Au over 3.5 metres hosted in a brecciated rhyolite containing 4% of pyrite stringers.  The interval is located in the extension of Lynx1, 125 metres above and 120 metres NE from OSK-W-17-790 (reported above).

OSK-W-17-812 intersected 18.6 g/t Au over 4.1 metres including 59.7 g/t Au over 0.3 metres and 184 g/t Au over 0.3 metres.  The hole intersected moderately silicified porphyry containing 3-4% disseminated pyrite, with local visible gold observed in smoky quartz veins.

Zone 27 Corridor

OSK-W-17-804 returned 3.65 g/t Au over 2.7 metres including 27.4 g/t Au over 0.3 metres.  Mineralization is associated with a sulfide vein containing 80% pyrite and local visible gold.
OSK-W-17-810 intersected two mineralized intercepts, one in the hanging wall of Zone 27 which returned 7.25 g/t Au over 4.9 metres, with 3% pyrite stringers;  the second intercept returned 6.54 g/t Au over 2.3 metres including 14.9 g/t Au over 1 metre.

Underdog Corridor

OSK-W-17-789 intersected two zones, the first returning 3.01 g/t Au over 3.1 metres in FW0 with mineralization consisting of 2% of pyrite stringers associated with moderate silica and sericite alteration; the second intersection returning 8.20 g/t Au over 2.3 metres in FW3 from a quartz vein containing local visible gold hosted in a moderate to strongly bleached porphyry dike.

OSK-W-17-789-W1 intersected two zones of mineralization, the first returning 5.63 g/t Au over 4.9 metres and extending FW0 45 metres SW from previous intersection EAG-12-320 (7.3 g/t Au over 3.1 meters), with 2% pyrite stringers and 4% disseminated pyrite hosted in a moderately bleached fragmental dike; the second intersection returned 5.69 g/t Au over 8.20 metres from FW1 containing 5 – 25% pyrite stringers hosted in a silicified porphyry dike.

Qualified Person
The scientific and technical content of this news release has been reviewed, prepared and approved by Mr. Louis Grenier, P.Geo. (OGQ 800), Project Manager of Osisko at 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 in the Caribou and Underdog zones are estimated at 65 – 80% true core lengths.  True width determinations in the Lynx Zone have yet to be determined.  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 eight drill holes focused on infill and expansion drilling in the Lynx Zone discovery as well as the Caribou, Underdog and the 27 zones reported in this news release; the significance of assay results presented in this news 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; 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