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