Osisko Intersects 479 g/t Au Over 2.0 Metres At Lynx

(Toronto, November 28, 2017)  Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.  The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall).  Significant new analytical results from 27 intercepts in 18 drill holes focused on infill and expansion drilling in the Lynx deposit are presented below.

Highlights from the new results include: 479 g/t Au over 2.0 metres in OSK-W-17-1169, and 27.4 g/t Au over 2.2 metres in OSK-W-17-1128.  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-17-1030 144.4 146.7 2.3 9.25   Lynx 1 Lynx
including 145.1 145.7 0.6 34.4  
OSK-W-17-1047 84.0 86.6 2.6 3.95   VNCR Lynx
OSK-W-17-1064 234.0 237.0 3.0 4.42   Lynx HW Lynx
including 235.5 237.0 1.5 8.41  
OSK-W-17-1072-W1 693.0 695.0 2.0 4.50   Lynx HW Lynx
including 694.0 695.0 1.0 8.76  
  818.0 820.0 2.0 3.79   Lynx 4 Lynx
including 819.0 819.3 0.3 23.0  
  825.0 827.0 2.0 9.52   Lynx 4 Lynx
including 825.0 826.0 1.0 19.0  
  911.0 914.0 3.0 6.09   Lynx 4 Lynx
including 911.0 912.0 1.0 17.5  
OSK-W-17-1096 58.8 61.1 2.3 3.48   Vein Lynx
OSK-W-17-1098 326.2 328.8 2.6 8.51   Lynx 2 Lynx
including 327.9 328.8 0.9 18.1  
OSK-W-17-1102 174.0 176.0 2.0 3.58   Lynx 1 Lynx
including 175.7 176.0 0.3 16.2  
OSK-W-17-1104 883.0 885.0 2.0 3.61   Lynx 4 Lynx
including 884.3 884.7 0.4 17.0  
OSK-W-17-1108 60.0 62.0 2.0 4.55   Lynx 1 Lynx
OSK-W-17-1111 204.0 206.0 2.0 11.0   Lynx 1 + Lynx 2 Lynx
including 204.0 205.0 1.0 21.7  
  259.0 261.0 2.0 4.18   Vein Lynx
OSK-W-17-1112 503.0 505.0 2.0 4.09   Lynx 1 Lynx
OSK-W-17-1113 389.6 395.0 5.4 4.66   Lynx 2 Lynx
including 389.6 389.9 0.3 20.1  
  418.4 420.7 2.3 3.11   Lynx 1 Lynx
including 419.5 419.8 0.3 22.9  
OSK-W-17-1120 210.0 212.0 2.0 4.93   Lynx 2 Lynx
including 210.0 211.0 1.0 9.12  
  329.0 331.2 2.2 3.24   Lynx HW Lynx
  334.0 336.7 2.7 5.68   Lynx HW Lynx
OSK-W-17-1128 916.4 918.6 2.2 27.4   Lynx 4 Lynx
  1181.0 1183.0 2.0 9.71   Lynx 6 Lynx
OSK-W-17-1132 501.0 503.0 2.0 8.28   VNCR Lynx
OSK-W-17-1149 346.8 349.0 2.2 11.0   Lynx HW Lynx
OSK-W-17-1153 149.0 151.1 2.1 10.4   Lynx 1 Lynx
including 150.3 151.1 0.8 25.6  
OSK-W-17-1169 761.0 763.0 2.0 479 30.3 Lynx Corridor Lynx
including 761.9 762.5 0.6 1595 100
  874.0 876.0 2.0 5.13   QTV Lynx
including 874.4 875.0 0.6 17.0  

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: HW = Hanging Wall, QTV = Quartz-Tourmaline Vein, VNCR = Crustiform Vein
Hole Number Azimuth (°) Dip (°) Length
(m)
UTM E UTM N Section
OSK-W-17-1030 332 -56 300 453346 5434982 3500
OSK-W-17-1047 333 -62 186 452937 5434890 3100
OSK-W-17-1064 330 -74 441 453460 5435020 3625
OSK-W-17-1072-W1 144 -57 948 453612 5435535 4000
OSK-W-17-1096 320 -46 120 453206 5434962 3375
OSK-W-17-1098 129 -48 425 453253 5435282 3575
OSK-W-17-1102 330 -50 345 453275 5434899 3400
OSK-W-17-1104 142 -50 1059 453383 5435455 3775
OSK-W-17-1108 330 -46 102 453133 5434954 3300
OSK-W-17-1111 335 -50 307 453275 5434899 3400
OSK-W-17-1112 136 -54 636 453437 5435481 3825
OSK-W-17-1113 138 -50 480 453280 5435347 3625
OSK-W-17-1120 154 -54 453 453457 5435338 3775
OSK-W-17-1128 129 -53 1419 453272 5435392 3625
OSK-W-17-1132 129 -49 600 453202 5435434 3600
OSK-W-17-1149 140 -47 489 453485 5435424 3825
OSK-W-17-1153 341 -45 615 453375 5434985 3525
OSK-W-17-1169 129 -55 1437 453330 5435468 3725

 

OSK-W-17-1030 intersected 9.25 g/t Au over 2.3 metres in Lynx 1. Mineralization consists of trace pyrite with local 5% pyrite in association with pervasive silica flooding hosted in a sericitized rhyolite.

OSK-W-17-1047 intersected 3.95 g/t Au over 2.6 metres related to Lynx 1 Corridor. Mineralization is composed of 7% disseminated to locally semi-massive pyrite and 2% stringers in a pseudo-crustiform vein hosted in gabbro.

OSK-W-17-1064 intersected Lynx HW returning 4.42 g/t Au over 3.0 metres. Mineralization is composed of trace disseminated pyrite in a chloritized, fuchsitized and slightly sericitized gabbro.

OSK-W-17-1072-W1 returned four intervals in Lynx Corridor: 4.50 g/t Au over 2.0 metres related to Lynx HW, 3.79 g/t Au over 2.0 metres, 9.52 g/t Au over 2.0 metres and 6.09 g/t Au over 3.0 metres all related to Lynx 4. The first interval is composed 10% pyrite with 5% ptygmatic tourmaline veinlets hosted in a silicified and sericitized gabbro. Mineralization from the Lynx 4 intervals is composed up to 5% pyrite in patches and stringers hosted in sericitized rhyolite with pervasive silica flooding.

OSK-W-17-1096 intersected 3.48 g/t Au over 2.3 metres. Mineralization is composed of 30% quartz veins with 2% pyrite hosted in a silicified and chloritized rhyolite.

OSK-W-17-1098 intersected 8.51 g/t Au over 2.6 meters related to Lynx 2. Mineralization includes up to 2% pyrite stringers and trace pyrite fragments in a sericitized and silicified fragmental felsic intrusive.

OSK-W-17-1102 intersected 3.58 g/t Au over 2.0 metres related to Lynx 1. Mineralization is composed of 5% pyrite stringer within a smoky quartz vein hosted in a sericitized and silicified rhyolite.

OSK-W-17-1104 intersected 3.61 g/t Au over 2.0 metres in Lynx 4. Mineralization is composed of 10% disseminated pyrite and 3% pyrite stringers hosted in a sericitized and silicified rhyolite with local breccia with carbonate matrix.

OSK-W-17-1108 intersected 4.55 g/t Au over 2.0 metres. The interval is related to Lynx 1 and consists of 5% pyrite-tourmaline stringers and 5% pyrite with pervasive silica flooding hosted in a fragmental felsic intrusive.

OSK-W-17-1111 intersected two intervals: 11.0 g/t Au over 2.0 metres and 4.18 g/t Au over 2.0 metres. The first interval is related to Lynx 1 and 2 and consists of trace pyrite in a strongly sericitized rhyolite. The second interval is composed of 10% centimetre-scale quartz veins with trace pyrite hosted in a sericitized rhyolite.

OSK-W-17-1112 intersected Lynx 1 returning 4.09 g/t Au over 2.0 metres. Mineralization is composed of 2% cluster and fragment pyrite and trace pyrite stringer in a sericitized fragmental felsic dike.

OSK-W-17-1113 intersected 4.66 g/t Au over 5.4 metres related to Lynx 2 and 3.11 g/t Au over 2.3 metres related to Lynx. The first interval is composed of 5% pyrite clusters and stringers within a pervasive silica flooding zone and trace pyrite-tourmaline vein at the contact between rhyolite and gabbro. The second interval from Lynx 1 corresponds with quartz veining and tourmaline veins creating a breccia texture with trace pyrite and chalcopyrite in a silicified gabbro.

OSK-W-17-1120 intersected Lynx 2 returning 4.93 g/t Au over 2.0 metres and Lynx HW with 3.24 g/t Au over 2.2 metres and 5.68 g/t Au over 2.7 metres. The first interval is composed of pyrite clusters and stringers and a quartz veining hosted in a slightly sericitized and silicified rhyolite. Mineralization in Lynx HW is up to 5% disseminated or clustered pyrite with pervasive silica flooding in a rhyolite.

OSK-W-17-1128 intersected 27.4 g/t Au over 2.2 metres related to Lynx 4 and 9.71 g/t Au over 2.0 metres related to Lynx 6. The mineralization from the first interval is composed of 5% pyrite stringers, 2% pyrite in tourmaline ptygmatic veins and a quartz-carbonate-chlorite vein hosted in a partially bleached andesite. The second interval consist of 1% pyrite stringers in a silicified and sericitized andesite.

OSK-W-17-1132 intersected 8.28 g/t Au over 2.0 metres within Lynx 3 Corridor. Mineralization consists of 3% pyrite both disseminated and as stringers within a low core angle crustiform veins hosted in a strongly fuschitized gabbro.

OSK-W-17-1149 intersected Lynx HW returning 11.0 g/t Au over 2.2 metres. Mineralization is composed of 15% pyrite-tourmaline stringers and quartz-carbonate veins and clusters in a strongly fuchsitized and silicified gabbro.

OSK-W-17-1153 intersected 10.4 g/t Au over 2.1 metres related to Lynx 1. Mineralization is composed of 5% disseminated pyrite and pyrite stringers in a pervasive silica flooding zone with sericite and fuchsite at contact between rhyolite and gabbro.

OSK-W-17-1169 intersected 479 g/t Au over 2.0 metres and 5.13 g/t Au over 2.0 metres related to the Lynx Corridor. The first interval is composed of local visible gold in centimeter scale smoky quartz with ptygmatic tourmaline veinlets and 7% pyrite stringers hosted in a bleached and fuchsitized gabbro at contact with felsic porphyry intrusive. The second interval consists in 2% pyrite within quartz tourmaline veins and disseminated pyrite in a chloritized and slightly sericitized gabbro.

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

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

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

About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-dOr and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100% interest in the Marban project located in the heart of Québecs prolific Abitibi gold mining district, and properties in the Larder Lake Mining Division in northeast Ontario, including the Jonpol and Garrcon deposits on the Garrison property, the Buffonta past producing mine and the Gold Pike mine property. The Corporation also holds interests and options in a number of additional properties in northern Quebec and Ontario.  Osisko continues to be well financed with approximately $220 million in cash and investments.

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

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

Osisko Caribou Extension Increases To 1.2 Kilometres At Windfall

Wolf Zone Extended 200 Metres to NE

High-Grade Infill and Expansion Intercepts Continue

(Toronto, November 16, 2017)  Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in Urban Township, Abitibi, Québec.  The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall).  Significant new analytical results from 59 intercepts in 35 drill holes focused on infill and expansion drilling in the Underdog, Caribou, Zone 27 and Mallard corridors of the Windfall deposit are presented below.

Highlights from the new results include: 204 g/t Au over 2.0 metres in OSK-W-17-936-W1; and 11.0 g/t Au over 11.2 metres in OSK-W-17-1105 in the Caribou Corridor; 87.0 g/t Au over 2.4 metres in OSK-W-17-866-W2 and 43.9 g/t Au over 3.0 metres in OSK-W-17-833-W2 in the Underdog Corridor; and 36.1 g/t over 4.0 metres in OSK-W-17-903 in Zone 27. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Hole Number From
(m)
To
(m)
Interval
(m)
Au (g/t)
uncut
Au (g/t)
cut to
100 g/t
Zone Corridor
OSK-OBM-16-660 573.9 576.8 2.9 15.0   FW3U Underdog
including 573.9 575.0 1.1 17.9  
including 576.0 576.8 0.8 22.8  
OSK-W-17-833-W1 1089.0 1091.9 2.9 8.24   FW3 Underdog
including 1091.6 1091.9 0.3 76.2  
OSK-W-17-833-W2 1014.0 1017.0 3.0 43.9 41.6 FW2 Underdog
including 1014.7 1016.4 1.7 72.8 68.7
including 1014.7 1015.0 0.3 123 100
OSK-W-17-847-W2 1075.1 1077.2 2.1 10.7   QTV Underdog
including 1075.1 1075.5 0.4 51.1  
OSK-W-17-866-W2 943.5 946.5 3.0 11.6   FW0 Underdog
including 946.1 946.5 0.4 44  
  964.0 966.4 2.4 13.0   FW0 FW Underdog
including 965.1 965.6 0.5 31.1  
  1056.0 1062.0 6.0 4.21   FW1 Underdog
including 1060.5 1062.0 1.5 12.6  
  1095.5 1097.7 2.2 5.4   FW1 Underdog
including 1096.3 1096.7 0.4 29  
  1126.1 1128.5 2.4 87.0 37.4 FW3 Underdog
including 1126.1 1126.9 0.8 249 100
OSK-W-17-885 472.0 474.0 2.0 21.4 19.8 Vein Caribou
including 472.9 473.2 0.3 111 100
  1051.0 1053.0 2.0 7.81   FW0 Underdog
including 1051.0 1052.0 1.0 15.5  
OSK-W-17-885-W1 1056.4 1061.0 4.6 5.24   FW0 HW Underdog
including 1060.0 1061.0 1.0 14.3  
  1237.0 1239.0 2.0 5.95   FW1 HW Underdog
including 1237.7 1238.5 0.8 11.2  
  1340.0 1345.8 5.8 5.19   FW1 Underdog
including 1340.0 1341.0 1.0 15.6  
including 1345.4 1345.8 0.4 17.8  
OSK-W-17-903 539.0 543.0 4.0 36.1 34.2 Z27 Z27
including 539.0 540.0 1.0 108 100
OSK-W-17-903-W2 688.4 690.9 2.5 3.22   FW3U Underdog
including 689.8 690.4 0.6 9.47  
OSK-W-17-936-W1 617.3 619.3 2.0 12.6   Wolf HW Caribou
including 617.3 618.3 1.0 21.3  
  640.8 643.0 2.2 14.2   Wolf Caribou
including 642.4 643.0 0.6 49.2  
  668.5 670.6 2.1 3.55   Wolf Caribou
including 668.9 669.3 0.4 16.9  
  697.0 699.0 2.0 204 50.5 Wolf FW Caribou
including 697.0 698.0 1.0 407 100
  704.0 706.0 2.0 14.8   Wolf FW Caribou
including 705.0 706.0 1.0 29.0  
OSK-W-17-936-W2 574.5 577.9 3.4 3.36   Wolf 2 Caribou
  693.9 695.9 2.0 27.7   VNCR Caribou
including 694.9 695.9 1.0 55.4  
  701.6 703.6 2.0 5.8   Wolf Caribou
  735.0 738.3 3.3 6.41   Wolf FW Caribou
including 735.0 735.9 0.9 14.6  
including 738.0 738.3 0.3 16.3  
OSK-W-17-937-W1 583.0 585.6 2.6 14.6   CS1 HW Caribou
including 583.8 584.9 1.1 34.1  
OSK-W-17-975 424.0 426.5 2.5 4.05   Caribou Ext. Caribou
including 424.6 425.0 0.4 23.2  
OSK-W-17-977 386.2 389.0 2.8 3.39   New Zone Underdog
including 386.2 387.0 0.8 9.92  
OSK-W-17-1009 127.9 130.0 2.1 3.16   Z27 Z27
OSK-W-17-1051 1096.7 1099.0 2.3 5.22   FW1 Underdog
including 1097.5 1098.0 0.5 17.5  
  1103.0 1105.4 2.4 7.09   FW1 Underdog
including 1104.0 1104.4 0.4 34.6  
  1111.0 1114.5 3.5 6.82   FW1 Underdog
including 1113.9 1114.5 0.6 29.7  
OSK-W-17-1051-W2 1081.5 1085.5 4.0 11.8   FW1 Underdog
including 1081.5 1082.0 0.5 52.4  
  1119.1 1121.3 2.2 7.19   FW1 FW Underdog
OSK-W-17-1081 61.3 63.7 2.4 10.4   Z27 Z27
including 62.0 62.6 0.6 35.2  
OSK-W-17-1087 243.0 245.0 2.0 3.28   Drake Mallard
OSK-W-17-1088 80.2 82.4 2.2 7.73   Z27 Z27
including 80.2 81.0 0.8 19.5  
OSK-W-17-1105 526.0 528.0 2.0 8.85   Caribou Ext. Caribou
including 527.5 528.0 0.5 17.3  
  534.3 539.0 4.7 4.94   Caribou Ext. Caribou
including 534.3 535.0 0.7 14.5  
  556.2 558.5 2.3 4.21   Caribou Ext. Caribou
  684.9 696.1 11.2 11.0 7.95 Wolf FW Caribou
including 684.9 689.8 4.9 21.4 14.5
OSK-W-17-1110 460.6 465.3 4.7 4.39   CS1 Caribou
including 460.6 461.2 0.6 12.4  
OSK-W-17-1115 333.6 336.4 2.8 13.7   New Zone  
OSK-W-17-1116 63.0 66.0 3.0 9.13   Z27 Z27
including 63.0 64.0 1.0 21.1  
OSK-W-17-1125-W3 583.0 585.0 2.0 11.5   Wolf FW Caribou
including 583.8 584.2 0.4 49.6  
OSK-W-17-1137 56.5 58.5 2.0 3.01   Z27 Z27
OSK-W-17-1138 142.0 158.0 16.0 6.3   VNCR Caribou
OSK-W-17-1145 90.9 93.3 2.4 12.5   Z27 Z27
  95.6 100.4 4.8 9.93   Z27 Z27
  120.0 125.9 5.9 7.25   Z27 Z27
OSK-W-17-1177 1353.1 1356.5 3.4 7.86   Caribou Ext. Caribou
including 1354.1 1355.1 1.0 17.1  
OSK-W-17-1224 371.0 373.4 2.4 3.12   Mallard Mallard
OSK-W-17-1226 717.0 721.6 4.6 8.29   New Zone Caribou
OSK-W-17-1232 206.0 208.0 2.0 27.2   Z27 Z27
OSK-W-17-1241 22.0 25.5 3.5 8.11   Caribou Ext. Caribou
including 24.6 25.5 0.9 17.9  
OSK-W-17-1252 168.0 170.0 2.0 8.38   New Zone  
including 168.0 169.0 1.0 16.7  
OSK-W-17-1257 155.5 157.6 2.1 7.69   Z27 Z27
including 156.2 156.5 0.3 44.9  
  161.0 163.3 2.3 3.15   Z27 Z27
including 163.0 163.3 0.3 17.2  
  172.0 174.0 2.0 15.4   Z27 Z27
including 172.0 173.0 1.0 30.1  

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, QTV = Quartz-Tourmaline Vein, VNCR = Crustiform Vein, Ext. = Extension
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-OBM-16-660 329 -52 651 452376 5434668 2500
OSK-W-17-833-W1 331 -57 1173 452597 5434393 2550
OSK-W-17-833-W2 331 -57 1244 452597 5434393 2550
OSK-W-17-847-W2 334 -69 1275 452645 5434429 2625
OSK-W-17-866-W2 332 -57 1332 452633 5434280 2525
OSK-W-17-885 335 -67 1458 452861 5434494 2850
OSK-W-17-885-W1 335 -67 1383 452861 5434494 2850
OSK-W-17-903 329 -56 801 452539 5434692 2650
OSK-W-17-903-W2 329 -56 795 452539 5434692 2650
OSK-W-17-936-W1 332 -56 808 452773 5434547 2775
OSK-W-17-936-W2 332 -56 819 452773 5434547 2775
OSK-W-17-937-W1 333 -57 945 452897 5434430 2850
OSK-W-17-975 334 -64 804 452862 5434814 3000
OSK-W-17-977 331 -51 540 452207 5434816 2425
OSK-W-17-1009 147 -49 183 452107 5434809 2325
OSK-W-17-1051 138 -68 1248 452313 5435323 2775
OSK-W-17-1051-W2 138 -68 1206 452313 5435323 2775
OSK-W-17-1081 145 -65 117 451987 5434710 2175
OSK-W-17-1087 328 -61 381 452255 5434830 2475
OSK-W-17-1088 148 -55 129 451972 5434737 2175
OSK-W-17-1105 328 -71 834 452920 5434843 3050
OSK-W-17-1110 333 -60 570 452488 5434436 2475
OSK-W-17-1115 153 -48 816 452796 5435118 3075
OSK-W-17-1116 150 -47 123 452039 5434729 2225
OSK-W-17-1125-W3 331 -58 1086 452563 5434568 2625
OSK-W-17-1137 132 -61 81 452136 5434749 2325
OSK-W-17-1138 327 -51 402 452888 5434989 3100
OSK-W-17-1145 146 -49 157 452041 5434769 2250
OSK-W-17-1177 340 -67 1422 454113 5435090 4225
OSK-W-17-1224 333 -70 402 452304 5434914 2550
OSK-W-17-1226 331 -51 934 453371 5434726 3400
OSK-W-17-1232 154 -47 351 452025 5434834 2275
OSK-W-17-1241 130 -45 282 452947 5435107 3225
OSK-W-17-1252 324 -46 231 452132 5434944 2425
OSK-W-17-1257 322 -71 250 452081 5434634 2225

 

OSK-OBM-16-660 intersected 14.1 g/t Au over 2.9 metres in FW3U. Mineralization is composed of up to 5% pyrite stringers and disseminated pyrite hosted in sericitized andesite.

OSK-W-17-833-W1 intersected 8.24 g/t Au over 2.9 metres in FW3. Mineralization is composed of up to 10% pyrite stringers hosted in a strongly sericitized fragmental felsic dike.

OSK-W-17-833-W2 intersected 43.9 g/t Au over 3.0 metres in FW2. Mineralization is composed of up to 15% pyrite stringers, 5% disseminated pyrite and local visible gold. The host rock is a fragmental felsic dike cross-cut by a large quartz eyes porphyritic felsic dike, is strongly silicified and moderately sericitized. The interval extends FW2 25 metres east of OSK-W-16-706-W1 (7.10 g/t Au over 5.0 metres previously reported September 19, 2016).

OSK-W-17-847-W2 intersected 10.7 g/t Au over 2.1 metres within the Underdog Corridor. Mineralization corresponds with decimetres scale quartz-tourmaline veins hosted in a sericitized felsic dike with 3% pyrite, disseminated or in stringers.

OSK-W-17-866-W2 intersected five intervals in the Underdog Corridor: 11.6 g/t Au over 3.0 metres in FW0, 13.0 g/t Au over 2.4 metres in FW0 FW, 4.21 g/t Au over 6.0 metres in FW1; 5.4 g/t Au over 2.2 metres related to FW1 and 87.0 g/t Au over 2.4 metres related to FW3. Mineralization in the first interval is at a sericitized and silicified contact between two felsic intrusions, and is composed of 5% pyrite stringers and 1 % disseminated pyrite. The second and third intervals are composed of 1% disseminated pyrite and pyrite stringers in a sericitized and slightly silicified porphyritic felsic intrusion. The fourth and fifth intervals are composed of 3% disseminated pyrite and 2% pyrite stringers associated with intense pervasive silica flooding hosted within a porphyritic felsic intrusion. Local visible gold is observed in the FW3 zone.

OSK-W-17-885 intersected two intervals: 21.4 g/t Au over 2.0 metres and 7.81 g/t Au over 2.0 metres in FW0. The first interval is 100 m south-east of the Caribou Corridor and composed of local visible gold associated with pyrite-chalcopyrite-tourmaline stringers hosted in the rhyolite. The FW0 interval is composed of 2% disseminated pyrite associated with quartz-pyrite-carbonate veinlets.

OSK-W-17-885-W1 intersected three intervals in the Underdog Corridor: 5.24 g/t Au over 4.6 metres in FW0 HW, 5.95 g/t Au over 2.0 metres in FW1 HW and 5.19 g/t Au over 5.8 metres in FW1. Mineralization is composed of up 3% pyrite stringers and 1% disseminated pyrite in a sericitized and silicified felsic porphyritic dike. The third interval contains trace pyrite stringers with intense silica and sericite alteration. This hole extends FW1 HW to the north-east, 135 metres down plunge of OSK-W-17-821-W1 (4.63 g/t Au over 5.0 metres previously reported August 24, 2017).

OSK-W-17-903 returned 36.1 g/t Au over 4.0 metres in Zone 27. Mineralization is composed of up to 10% pyrite stringers and 5% disseminated pyrite in a moderately sericitized andesite.

OSK-W-17-903-W2 intersected 3.22 /t Au over 2.5 metres in FW3U. Mineralization is composed of 3% pyrite stringers with centimetre scale crustiform veins and quartz-tourmaline veins hosted in a sericitized andesite.

OSK-W-17-936-W1 intersected multiple mineralized zones in the Caribou Corridor: 12.6 g/t Au over 2.0 metres in Wolf HW, 14.2 g/t Au over 2.2 metres and 3.55 g/t Au over 2.1 metres in Wolf, and 204 g/t Au over 2.0 metres and 14.8 g/t over 2.0 metres in Wolf FW. The first two intervals are hosted in a sericitized andesite and composed of up to 10% pyrite stringers and 2% disseminated pyrite. The third interval includes 20% quartz-tourmaline veins associated with a hydrothermal breccia. The fourth and fifth intervals are composed of up to 1% pyrite stringers and 1% disseminated pyrite within a strongly silicified large quartz eyes porphyritic felsic intrusion.

OSK-W-17-936-W2 intersected four intervals in the Caribou Corridor: 3.36 g/t Au over 3.4 metres in Wolf 2, 27.7 g/t Au over 2.0 metres in a crustiform vein, 5.8 g/t Au over 2.0 metres in Wolf, and 6.41 g/t Au over 3.3 metres in Wolf FW. Wolf 2 mineralization and the crustiform vein are hosted in a strongly sericitized andesite and contain up to 8% pyrite stringers in stockwork texture. The Wolf interval contains local visible gold and 1% disseminated pyrite within a large quartz eyes porphyritic felsic intrusion. The last interval, the Wolf FW, is composed of 1% disseminated pyrite and 1% pyrite clusters in a silicified felsic dike.

OSK-W-17-937-W1 returned 14.6 g/t Au over 2.6 metres in CS1 HW. The mineralization is composed of 2% quartz-tourmaline veins and traces of disseminated pyrite. The interval is hosted in a strongly sericitized rhyolite.

OSK-W-17-975 returned 4.05 g/t Au over 2.5 metres in the extension of the Caribou Corridor. The mineralization is composed of trace disseminated pyrite and pyrite stringers in a chloritized andesite near the porphyritic felsic intrusion contact.

OSK-W-17-977 intersected 3.39 g/t Au over 2.8 metres in the Underdog Corridor. Mineralization is composed of trace disseminated and stringer pyrite associated with weak sericite and silica alteration within porphyritic felsic intrusion. This new zone is located just under the Red Dog intrusion, 60 metres north of the Mallard zone. The exact geometry and relationship with the Mallard zone is yet to be determined.

OSK-W-17-1009 returned 3.16 g/t Au over 2.1 metres in Zone 27. Traces of disseminated pyrite and pyrite stringers are associated with sericitized rhyolite.

OSK-W-17-1051 intersected three intervals all in the FW1 zone in the Underdog Corridor. The intervals returned 5.22 g/t Au over 2.3 metres, 7.09 g/t Au over 2.4 metres and 6.82 g/t Au over 3.5 metres in a strongly silicified and moderately sericitized large quartz eyes porphyritic felsic intrusion. The mineralization is composed of up to 25% pyrite stringers and 2% pyrite in silica flooding and up to 2% chalcopyrite. The second interval contains local visible gold.

OSK-W-17-1051-W2 intersected two intervals in the Underdog Corridor: 11.8 g/t Au over 4.0 metres in FW1 and 7.19 g/t Au over 2.2 metres in FW1 FW. The first interval is composed of 10% pyrite stringers and 1% disseminated pyrite associated with a strong silica alteration and hosted in fragmental felsic dike. The second interval is composed of up to 20% pyrite stringers and local visible electrum.

OSK-W-17-1081 returned 10.4 g/t Au over 2.4 metres in Zone 27. Mineralization is hosted in a strongly silicified and weakly sericitized porphyritic felsic dike and composed of up to 5% disseminated pyrite and quartz-tourmaline veins.

OSK-W-17-1087 returned 3.28 g/t Au over 2.0 metres in Drake. Mineralization is composed of 5% pyrite stringers within a sericitized porphyritic felsic dike.

OSK-W-17-1088 returned 7.73 g/t Au over 2.2 metres in Zone 27. Mineralization is composed of up to 10% pyrite within pervasive silica flooding hosted in a porphyritic felsic dike.

OSK-W-17-1105 intersected four intervals in the Caribou Corridor: 8.85 g/t Au over 2.0 metres, 4.94 g/t Au over 4.7 metres and 4.21 g/t Au over 2.3 metres in the extension of Caribou and 11.0 g/t Au over 11.2 metres, in the Wolf FW. The first two intervals are associated with large quartz eyes porphyritic felsic dikes and the mineralization is composed of up to 2% pyrite stringers and clusters. The sulphides content increases up to 15% pyrite stringers in the third interval with the mineralization hosted in a sericitized andesite. The last interval contains 15% pyrite stringers, 5% pyrite clusters and local visible gold associated with a strong sericitized andesite. This interval extends the Wolf FW zone 200m north-east and down plunge of OSK-W-17-913 (13.6 g/t Au over 2.0 metres previously reported September 20, 2017).

OSK-W-17-1110 intersected 4.39 g/t Au over 4.7 metres in the Caribou Corridor. Mineralization is composed of up to 10% pyrite clusters and up to 5% ptygmatic tourmaline veins in pervasive silica flooding. The mineralization is at the contact between an andesite and a porphyritic felsic intrusion.

OSK-W-17-1115 intersected a new zone returning 13.7 g/t Au over 2.8 metres. Mineralization is within a sericitized rhyolite and includes 4% disseminated pyrite, 2% pyrite clusters and disseminated tourmaline. This intersection is near a felsic intrusion and highlights a potential area between the main Caribou and the Lynx down plunge trends.

OSK-W-17-1116 returned 9.13 g/t Au over 3.0 metres in Zone 27. The mineralization is associated to a large quartz eyes porphyritic dike and composed of up to 10% pyrite and tourmaline veins.

OSK-W-17-1125-W3 returned 11.5 g/t Au 2.0 metres in the Wolf FW. Mineralization includes up to 30% pyrite stringers in a strongly sericitized fragmental felsic intrusion.

OSK-W-17-1137 intersected 3.01 g/t Au over 2.0 metres in Zone 27. Mineralization is composed of up to 8% pyrite stringers and up to 10% pyrite clusters within a strongly silicified rhyolite.

OSK-W-17-1138 returned 6.3 g/t Au over 16.0 metres in the Caribou Corridor. The mineralization is composed of 3% pyrite clusters, up to 10% pyrite stringers and disseminated chalcopyrite hosted in fragmental felsic dike and crustiform veins. Strong silica and fuchsite alteration are observed.

OSK-W-17-1145 intersected three intervals in Zone 27: 12.5 g/t Au over 2.4 metres, 9.93 g/t Au over 4.8 metres and 7.25 g/t Au over 5.9 metres. The mineralization is similar in the three intervals including up to 20% pyrite stringers in a strong silica flooding. The mineralization is hosted at the contact between a porphyritic felsic dike and the rhyolite.

OSK-W-17-1177 intersected 7.86 g/t Au over 3.4 metres in the extension of the Caribou Corridor. The mineralization is composed of 5% pyrite stringers associated with strong silica alteration zone within the andesite. This interval extends the Caribou Corridor 975 metres down plunge to the north-east from OSK-W-17-787 (7.21 g/t Au over 6.5 metres previously reported March 22, 2017).  With this new hole, the Caribou Extension has now been traced to section 4075E, 1.2 kilometres north-east from the previous operator’s 2015 resource envelope.

OSK-W-17-1224 returned 3.12 g/t Au over 2.4 metres in Mallard. Mineralization is in strongly sericitized and silicified andesite and composed of 30% quartz-carbonate veins with crustiform textures. The sulphides contain up to 2% disseminated pyrite and up to 7% pyrite stringers.

OSK-W-17-1226 intersected a new zone in the Caribou Corridor. The zone is located under a gabbro intrusion, which has the same orientation as the Red Dog, but above the main Caribou down plunge trend. The interval returned 8.29 g/t Au over 4.6 metres in a sericitized and silicified rhyolite cross-cut by felsic intrusions. The mineralization is composed of 10% pyrite stringers and locally semi-massive pyrite (10 cm wide). This new zone is located 150 metres down plunge of OSK-W-17-838 (731 g/t Au over 2.0 metres and 4.55 g/t Au over 3.0 metres previously reported August 24).

OSK-W-17-1232 returned 27.2 g/t Au over 2.0 metres in Zone 27. The mineralization is composed of 2% disseminated pyrite, 3% pyrite stringers and tourmaline veins in a strongly sericitized rhyolite.

OSK-W-17-1241 intersected 8.11 g/t Au over 3.5 metres in the upper part of the Caribou extension. Mineralization is composed of 5% pyrite stringers within a strongly sericitized fragmental intrusion. The geometry of this interval is yet to be determined.

OSK-W-17-1252 intersected 8.38 g/t Au over 2.0 metres in a new zone located 100 metres north-west of the Mallard Corridor. The mineralization is composed of 3% pyrite stringers and locally 20 centimetres scale pyrite veins within a moderately sericitized andesite.

OSK-W-17-1257 intersected three intervals in Zone 27: 7.69 g/t Au over 2.1 metres, 3.15 g/t Au over 2.3 metres and 15.4 g/t Au over 2.0 metres. The mineralization is at the contact between two porphyritic felsic dikes and is composed of up to 1% pyrite stringers, trace of pyrite clusters and one massive pyrite vein of 20 centimetres.

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

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

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

About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-dOr and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100% interest in the Marban project located in the heart of Québecs prolific Abitibi gold mining district, and properties in the Larder Lake Mining Division in northeast Ontario, including the Jonpol and Garrcon deposits on the Garrison property, the Buffonta past producing mine and the Gold Pike mine property. The Corporation also holds interests and options in a number of additional properties in northern Quebec and Ontario.  Osisko continues to be well financed with approximately $220 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

Osisko Intersects 301 g/t Au Over 6.2 Metres At Lynx

Lynx Corridor Confirmed 120 Metres to NE
Lynx 4 Zone Extended 300 Metres – Lynx 5 Zone Extended 120 Metres

(Toronto, November 14, 2017)  Osisko Mining Inc. (OSK:TSX “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in Urban Township, Abitibi, Québec.  The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall).  Significant new analytical results from 44 intercepts in 30 drill holes focused on infill and expansion drilling in the Lynx deposit are presented below.

Highlights from the new results include: 301 g/t Au over 6.2 metres, in OSK-W-17-909; 79.4 g/t Au over 2.6 metres in OSK-W-17-928; and 19.0 g/t Au over 6.8 metres in OSK-W-17-1111. 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-17-895 179.1 181.3 2.2 24.3   Lynx 1 Lynx
Including 179.1 180.0 0.9 54.0  
  209.0 211.0 2.0 17.5   Lynx 2 Lynx
Including 209.0 210.0 1.0 34.4  
OSK-W-17-902 233.5 236.0 2.5 3.95   Lynx HW Lynx
  281.1 283.1 2.0 4.56   Lynx 1 Lynx
Including 281.1 282.1 1.0 9.07  
OSK-W-17-909 912.0 918.2 6.2 301 53.7 Lynx 1 Lynx
Including 913.6 914.9 1.3 1230 100
  922.0 928.0 6.0 10.7   Lynx 1 Lynx
  933.0 935.0 2.0 4.97   Lynx 1 Lynx
OSK-W-17-928 341.7 344.3 2.6 79.4 14.2 Lynx 1 Lynx
Including 341.7 342.0 0.3 665 100
OSK-W-17-941 188.3 190.5 2.2 13.4   Lynx HW Lynx
Including 189.3 189.6 0.3 85.1  
  197.7 200.0 2.3 5.77   Lynx 1 Lynx
Including 198.7 199.0 0.3 39.1  
OSK-W-17-948 475.0 477.0 2.0 4.39   Lynx 1 Lynx
Including 475.0 475.5 0.5 17.3  
  593.6 596.0 2.4 4.62   Lynx HW Lynx
OSK-W-17-949 403.5 406.5 3.0 3.97   Vein Lynx
OSK-W-17-950 1131.0 1133.0 2.0 4.49   VNCR Lynx
Including 1132.0 1132.4 0.4 21.7  
  1211.3 1215.5 4.2 6.52   Lynx 4 Lynx
OSK-W-17-958 1076.0 1078.0 2.0 9.51   Lynx 4 Lynx
Including 1077.0 1078.0 1.0 18.9  
OSK-W-17-967 259.0 261.0 2.0 10.9   VNCR Lynx
Including 259.0 260.0 1.0 21.4  
OSK-W-17-970 524.0 526.0 2.0 7.51   Lynx HW Lynx
Including 524.9 525.5 0.6 15.0  
OSK-W-17-972 224.5 226.5 2.0 5.23   QTV Lynx
Including 224.5 225.0 0.5 20.5  
OSK-W-17-981 828.9 831.0 2.1 6.21   Lynx HW Lynx
Including 830.0 831.0 1.0 12.5  
  890.0 892.0 2.0 5.23   Lynx 4 Lynx
Including 890.5 890.9 0.4 24.5  
OSK-W-17-986 263.0 265.0 2.0 6.74   Lynx 2 Lynx
Including 263.0 264.0 1.0 13.1  
OSK-W-17-987 132.7 135.0 2.3 4.97   Lynx HW Lynx
Including 134.0 135.0 1.0 11.4  
OSK-W-17-991 1149.0 1151.0 2.0 5.11   Lynx 1 Lynx
OSK-W-17-1007 238.6 240.6 2.0 6.54   Lynx 1 Lynx
Including 238.6 240.0 1.4 9.31  
  340.0 342.2 2.2 10.5   VNCR Lynx
OSK-W-17-1058 190.0 193.1 3.1 8.50   Lynx 2 Lynx
Including 190.0 190.3 0.3 15.4  
Including 192.8 193.1 0.3 64.5  
OSK-W-17-1064 326.0 328.0 2.0 8.92   Lynx 1 Lynx
OSK-W-17-1072 884.0 886.3 2.3 3.73   Lynx 4 Lynx
OSK-W-17-1072-W3 1095.0 1097.0 2.0 11.3   Lynx 4 Lynx
Including 1095.0 1096.0 1.0 20.6  
OSK-W-17-1073 409.0 411.0 2.0 8.65   Lynx 4 Lynx
  470.5 473.0 2.5 3.61   Vein Lynx
Including 470.5 471.2 0.7 12.7  
OSK-W-17-1085 254.8 257.0 2.2 4.83   Lynx 1 Lynx
  272.0 276.0 4.0 4.45   Lynx 2 Lynx
OSK-W-17-1098 249.9 252.3 2.4 13.7   Lynx 3 Lynx
Including 250.6 251.4 0.8 34.7  
OSK-W-17-1104 578.2 581.0 2.8 6.79   Lynx HW Lynx
Including 578.2 578.6 0.4 46.4  
  978.0 980.0 2.0 10.3   Lynx 5 Lynx
Including 978.6 979.3 0.7 29.3  
OSK-W-17-1111 278.7 285.5 6.8 19.0   Lynx 2 Lynx
Including 281.0 284.5 3.5 32.6  
OSK-W-17-1128 486.9 489.0 2.1 36.1 28.6 Lynx 2 Lynx
Including 487.6 488.0 0.4 139 100
OSK-W-17-1136 56.0 58.0 2.0 5.40   Lynx 2 Lynx
Including 56.6 57.0 0.4 26.2  
OSK-W-17-1143 67.5 69.6 2.1 27.9   Lynx 2 Lynx
Including 67.5 68.2 0.7 83.3  
  73.0 75.0 2.0 10.6   Lynx 2 Lynx
OSK-W-17-1190 762.3 764.4 2.1 6.03   Lynx 5 Lynx
  798.0 804.0 6.0 4.09   Lynx 5 Lynx

Notes:

  1. True widths are estimated at 65 – 80% of the reported core length interval.  See “Quality Control” below.
  2. Definitions: HW = Hanging Wall; VNCR = crustiform vein; QTV = Quartz-Tourmaline vein.
Hole Number Azimuth (°) Dip (°) Length
(m)
UTM E UTM N Section
OSK-W-17-895 332 -50 444 453349 5434937 3475
OSK-W-17-902 331 -50 468 453390 5434852 3475
OSK-W-17-909 131 -55 1119 453683 5435677 4125
OSK-W-17-928 333 -64 465 453433 5434905 3550
OSK-W-17-941 330 -49 444 453434 5434969 3575
OSK-W-17-948 144 -52 633 453406 5435465 3800
OSK-W-17-949 333 -55 423 453434 5434969 3575
OSK-W-17-950 131 -59 1269 453676 5435684 4125
OSK-W-17-958 143 -55 1212 453359 5435439 3725
OSK-W-17-967 337 -62 333 453176 5434908 3300
OSK-W-17-970 143 -51 714 453406 5435465 3800
OSK-W-17-972 333 -60 291 453176 5434910 3325
OSK-W-17-981 133 -62 1110 453606 5435603 4025
OSK-W-17-986 328 -66 360 453447 5435019 3600
OSK-W-17-987 339 -60 327 453224 5434909 3350
OSK-W-17-991 128 -58 1378 453980 5435994 4550
OSK-W-17-1007 334 -68 378 453477 5435045 3650
OSK-W-17-1058 332 -50 318 453201 5434911 3350
OSK-W-17-1064 330 -74 441 453460 5435020 3625
OSK-W-17-1072 144 -57 1086 453612 5435535 4000
OSK-W-17-1072-W3 144 -57 1110 453612 5435535 4000
OSK-W-17-1073 144 -51 603 452755 5434982 3000
OSK-W-17-1085 339 -68 447 453460 5435020 3625
OSK-W-17-1098 129 -48 425 453253 5435282 3575
OSK-W-17-1104 142 -50 1059 453383 5435455 3775
OSK-W-17-1111 335 -50 307 453275 5434899 3400
OSK-W-17-1128 129 -53 1419 453272 5435392 3625
OSK-W-17-1136 331 -45 156 453105 5434948 3275
OSK-W-17-1143 331 -46 159 453250 5435004 3425
OSK-W-17-1190 151 -49 1179 452905 5435152 3200

 

OSK-W-17-895 intersected 24.3 g/t Au over 2.2 metres in Lynx 1 and 17.5 g/t Au over 2.0 metres in Lynx 2. Mineralization consists of up to 15% disseminated pyrite, pyrite stringers and local visible gold in quartz veins and strongly silica altered felsic intrusions with porphyritic and fragmental textures.

OSK-W-17-902 intersected two intervals: 3.95 g/t Au over 2.5 metres and 4.56 g/t Au over 2.0 metres. Mineralization is composed of up to 5% disseminated pyrite and local pyrite stringers associated with quartz veins in the Lynx hanging wall and Lynx 1.

OSK-W-17-909 returned three proximal intervals in Lynx 1: 301 g/t Au over 6.2 metres, 10.7 g/t Au over 6.0 metres and 4.97 g/t Au over 2.0 metres. Mineralization is composed of up to 15% pyrite stringers, up to 5% pyrite clusters, 1% galena and local visible gold. The intervals are at the contact between a gabbro and rhyolite and characterized by strong silica, sericite and fuchsite alteration, in an area known as the “Northern Lights”.

OSK-W-17-928 returned 79.4 g/t Au over 2.6 meters in Lynx 1. Local visible gold occurs at the contact between a felsic porphyritic dike and a gabbro. Mineralization includes 4% pyrite stringers and 10% quartz-tourmaline veins within moderate silica alteration.

OSK-W-17-941 intersected two intervals: 13.4 g/t Au over 2.2 metres and 5.77 g/t Au over 2.3 metres. The first interval, related to the Lynx hanging wall, consists of sericitized and strongly silicified rhyolite with traces of pyrite stringer and ptygmatic tourmaline veins. The mineralization in the second interval, related to Lynx 1, is similar but at the contact with a gabbro.

OSK-W-17-948 intersected 4.39 g/t Au over 2.0 metres and 4.62 g/t Au over 2.4 metres. The first interval, related to Lynx 1, consists of 1% pyrite stringers, 2% pyrite-quartz veins within a silicified and sericitized fragmental felsic dike. The second interval is related to Lynx hanging wall. Mineralization is at the silicified, sericitized and chloritized contact between a rhyolite and a gabbro, and includes 3% pyrite stringers and 1% pyrite-tourmaline-quartz veins.

OSK-W-17-949 intersected a quartz-carbonate vein within the Lynx corridor returning 3.97 g/t Au over 3.0 metres. Mineralization is composed of traces of disseminated pyrite.

OSK-W-17-950 intersected 4.49 g/t Au over 2.0 metres and 6.52 g/t Au over 4.2 metres. The first interval is related to a crustiform quartz-tourmaline vein with local visible gold within the gabbro. The second interval, related to Lynx 4, consists of up to 4% pyrite-tourmaline stringers with pervasive silica flooding in a felsic porphyric dike. This intersection extends Lynx 4 by 300 metres to the north-east and down plunge from OSK-W-17-1169 (21.2 g/t Au over 4.3 metres previously reported October 12, 2017).

OSK-W-17-958 returned 9.51 g/t Au over 2.0 metres in Lynx 4. Mineralization is composed of trace disseminated pyrite within a sericitized rhyolite.

OSK-W-17-967 returned 10.9 g/t Au over 2.0 metres within a crustiform vein. The mineralization is composed of trace disseminated pyrite within a chloritized gabbro.

OSK-W-17-970 intersected 7.51 g/t Au over 2.0 metres in the Lynx hanging wall. Mineralization is composed of 3% pyrite with fuchsite in a silicified andesite. The andesite interval is between a fragmental felsic dike and a large quartz eyes porphyritic felsic intrusion.

OSK-W-17-972 intersected 5.23 g/t Au over 2.0 metres. The mineralization consists of 2% pyrite and 30% quartz-tourmaline veins within a gabbro.

OSK-W-17-981 returned 6.21 g/t Au over 2.1 metres in Lynx hanging wall and 5.23 g/t Au over 2.0 metres in Lynx 4. In the Lynx hanging wall the mineralization is composed of 3% disseminated pyrite and traces of pyrite stringers within a strongly sericitized rhyolite. Lynx 4 is composed of up to 5% stringers within the gabbro.

OSK-W-17-986 intersected 6.74 g/t Au over 2.0 metres in Lynx 2. Mineralization is composed of 1% pyrite fragments and traces of disseminated pyrite in a silicified fragmental felsic intrusion.

OSK-W-17-987 intersected 4.97 g/t Au over 2.3 metres in the Lynx hanging wall. Mineralization is composed of traces of disseminated pyrite with local pervasive silica flooding and carbonate veins hosted in a sericitized and strongly chloritized gabbro.

OSK-W-17-991 returned 5.11 g/t Au over 2.0 metres in Lynx 1. Mineralization is composed of 3% pyrite stringers at the contact between a chloritized gabbro and the fragmental felsic intrusion. The interval extends Lynx 1 120 metres north-east of OSK-W-17-929 (18.0 g/t Au over 2.0 metres previously reported October 3, 2017).

OSK-W-17-1007 intersected two intervals: 6.54 g/t Au over 2.0 metres in Lynx 1 and 10.5 g/t Au over 2.2 metres in a crustiform vein. The Lynx 1 mineralization is composed of 10% pyrite stringers in a chloritized and sericitized andesite at the contact with a fragmental felsic intrusion. The crustiform vein is within the Lynx 3 zone and includes 5% disseminated pyrite, 5% pyrite-tourmaline stringers and 1% crustiform quartz veins hosted in chloritized gabbro.

OSK-W-17-1058 intersected 8.50 g/t Au over 3.1 metres in Lynx 2. Mineralization is composed of a decimeter scale crustiform vein with local visible gold, 1% pyrite, disseminated sphalerite and tourmaline veins. The interval is hosted in a strongly silicified rhyolite.

OSK-W-17-1064 intersected Lynx 1 returning 8.92 g/t Au over 2.0 metres. Mineralization is composed of 3% disseminated pyrite and a crustiform vein within a pervasively silica flooded, and fuchsite altered gabbro.

OSK-W-17-1072 intersected 3.73 g/t Au over 2.3 metres in Lynx 4. Local visible gold occurs in a centimetre scale quartz vein. Mineralization also includes up to 4% pyrite-tourmaline stringers in a moderately sericitized rhyolite.

OSK-W-17-1072-W3 intersected 11.3 g/t Au over 2.0 metres in Lynx 4. Mineralization is composed of 8% pyrite stringers associated with interstitial carbonate veinlets hosted in chloritized and slightly sericitized rhyolite.

OSK-W-17-1073 intersected two intervals: 8.65 g/t Au over 2.0 metres and 3.61 g/t Au over 2.5 metres in the south-west extension of Lynx 4 near the main zone. The first interval is hosted in rhyolite and composed of 20% pyrite with silica flooding. The second interval is hosted in the andesite and is composed of 10% disseminated pyrite and quartz-carbonate veins. These intervals are 200 metres south-west of OSK-W-17-1109 (16.9 g/t Au over 4.0 metres previously reported October 12, 2017).

OSK-W-17-1085 intersected Lynx 1 and Lynx 2: 4.83 g/t Au over 2.2 metres and 4.45 g/t Au over 4.0 metres, respectively. Both intersects are hosted in a silica altered fragmental intrusion and composed of up to 3% disseminated pyrite, 2% pyrite clusters and 1% quartz-tourmaline veins.

OSK-W-17-1098 intersected 13.7 g/t Au over 2.4 metres in Lynx 3. Mineralization is composed of up to 3% pyrite stringers with quartz-carbonate veins hosted in a moderately silicified and sericitized fragmental felsic intrusion.

OSK-W-17-1104 intersected two intervals: 6.79 g/t Au over 2.8 metres in Lynx hanging wall and 10.3 g/t Au over 2.0 metres in Lynx 5. The first interval is hosted in a sericitized and fuchsitized gabbro and is composed of 1% disseminated pyrite and 1% pyrite stringers. The second interval is composed of 5% pyrite with silica flooding at the contact between the andesite and the rhyolite. Lynx 5 is extended 120 metres north-east of OSK-W-17-907 (25.9 g/t Au over 2.1 metres previously reported October 30, 2017).

OSK-W-17-1111 intersected 19.0 g/t Au over 6.8 metres in Lynx 2. The interval consists in a sericitized rhyolite with 10% pyrite stringers and pervasive silica flooding.

OSK-W-17-1128 intersected 36.1 g/t Au over 2.1 metres in Lynx 2. Mineralization is composed of up to 2% pyrite stringers within a strongly silicified and sercitized contact between a porphyritic felsic dike and the gabbro.

OSK-W-17-1136 returned 5.40 g/t Au over 2.0 metres in Lynx 2. Mineralization is composed of 15% pyrite with silica flooding within a strongly silicified fragmental felsic intrusion.

OSK-W-17-1143 returned two intervals: 27.9 g/t Au over 2.1 metres and 10.6 g/t Au over 2.0 metres. The first interval is composed of local visible gold and 30% pyrite stringers at the contact between the gabbro and the rhyolite. The second interval is within a sericitized fragmental felsic intrusion and composed of traces of disseminated pyrite. Both intervals are in Lynx 2.

OSK-W-17-1190 intersected with 6.03 g/t Au over 2.1 metres and 4.09 g/t Au over 6.0 metres. The first interval is composed of up to 20% disseminated pyrite with a centimeter scale smoky quartz vein, hosted in andesite. The second interval is a sericitized andesite containing up to 20% disseminated to locally semi-massive pyrite (50%). These intervals are 500 metres south-west of OSK-W-17-907 (30.2 g/t Au over 2.0 metres previously reported September 18, 2017) in the general up-plunge trend of Lynx 5, geometry of the zone remains to be determined.

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

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

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

About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-dOr and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100% interest in the Marban project located in the heart of Québecs prolific Abitibi gold mining district, and properties in the Larder Lake Mining Division in northeast Ontario, including the Jonpol and Garrcon deposits on the Garrison property, the Buffonta past producing mine and the Gold Pike mine property. The Corporation also holds interests and options in a number of additional properties in northern Quebec and Ontario.  Osisko continues to be well financed with approximately $220 million in cash and investments.

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

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

Osisko Intersects 17.8 g/t Au Over 4.7 Metres At Windfall

Caribou Extension Continues to Run to NE

Zone 27 Extended 200 metres to NE

(Toronto, November 1, 2017) Osisko Mining Inc. (OSK:TSX “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in Urban Township, Abitibi, Québec.  The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall).  Significant new analytical results from 47 intercepts in 35 drill holes focused on infill and expansion drilling in the Underdog, Caribou, Zone 27 and Mallard corridors of the Windfall deposit are presented below.

Highlights from the new results include: 17.8 g/t Au over 4.7 metres in OSK-W-17-862-W2; 19.3 g/t Au over 3.5 metres in OSK-W-17-847-W2; 19.2 g/t Au over 2.5 metres in OSK-W-17-899;  and 9.90 g/t Au over 4.6 metres in OSK-W-17-985. 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-17-847-W1 907.0 910.0 3.0 13.1   FW0 Underdog
including 908.0 909.0 1.0 36.0  
OSK-W-17-847-W2 1149.0 1152.5 3.5 19.3   FW1 Underdog
including 1149.0 1150.0 1.0 35.5  
including 1151.8 1152.5 0.7 44.9  
OSK-W-17-855-W1 968.0 971.0 3.0 13.5   FW3 FW Underdog
including 969.0 971.0 2.0 18.2  
  1012.0 1014.0 2.0 8.31   QTV Underdog
including 1013.0 1014.0 1.0 16.5  
OSK-W-17-862-W2 473.0 477.7 4.7 17.8   CS3 Caribou
including 475.0 477.0 2.0 33.3  
  551.8 554.0 2.2 6.12   Wolf HW Caribou
including 552.3 552.8 0.5 26.3  
OSK-W-17-871-W1 610.1 612.4 2.3 8.38   QTV Underdog
including 610.1 610.8 0.7 27.4  
OSK-W-17-880 146.2 149.4 3.2 3.32   Caribou HW Caribou
  415.5 418.0 2.5 7.92   Z27 HW Z27
including 415.5 417.0 1.5 13.2  
OSK-W-17-880-W1 373.0 376.0 3.0 16.5   Z27 HW Z27
including 373.0 374.5 1.5 33.0  
OSK-W-17-880-W2 776.8 779.5 2.7 8.41   FW3U Underdog
including 777.5 778.0 0.5 29.1  
OSK-W-17-885-W1 1188.0 1190.0 2.0 8.12   FW1 HW Underdog
including 1188.3 1189.3 1.0 15.3  
OSK-W-17-889 606.0 608.5 2.5 6.79   Wolf HW Caribou
including 606.0 607.0 1.0 15.9  
  631.5 634.0 2.5 19.2   Wolf HW Caribou
including 631.5 632.2 0.7 65.0  
  662.0 664.0 2.0 9.68   Wolf Caribou
OSK-W-17-903 412.5 420.0 7.5 4.97   CN2 FW Caribou
including 412.5 414.0 1.5 19.4  
OSK-W-17-903-W1 408.9 410.9 2.0 9.30   CN2 FW Caribou
including 408.9 410.0 1.1 16.7  
OSK-W-17-937 757.8 759.8 2.0 11.9   CS3 Caribou
OSK-W-17-975 465.0 472.8 7.8 4.31   Caribou Caribou
including 465.0 467.0 2,0 8.29  
including 472.0 472.8 0.8 13.9  
  675.0 677.2 2.2 7.09   Z27 Z27
including 675.7 676.5 0.8 15.7  
OSK-W-17-985 145.4 150.0 4.6 9.9   Z27 (15m infill) Z27
including 145.4 145.7 0.3 42.9  
OSK-W-17-989-W2 542.0 544.7 2.7 5.28   CS3 Caribou
including 542.0 543.0 1.0 13.0  
OSK-W-17-990 104.8 108.1 3.3 3.25   Z27 (15m infill) Z27
  186.3 189.0 2.7 26.4 15.1 Z27 Z27
including 187.3 187.7 0.4 176 100
OSK-W-17-1014 133.5 135.6 2.1 5.22   Z27 Z27
OSK-W-17-1018 199.7 205.6 5.9 3.55   Mallard Mallard
including 200.5 200.8 0.3 30.9  
OSK-W-17-1028 370.9 374.0 3.1 11.6   Caribou Extension Caribou
including 372.7 374.0 1.3 18.6  
  383.6 385.9 2.3 10.6   Caribou Extension Caribou
including 385.5 385.9 0.4 51.1  
  393.0 396.1 3.1 3.12   Caribou Extension Caribou
OSK-W-17-1035 68.4 71.0 2.6 4.27   Z27 Z27
including 69.1 69.6 0.5 15.2  
OSK-W-17-1042 62.8 75.0 12.2 3.39   Z27 (15m infill) Z27
including 73.0 74.0 1.0 20.2  
OSK-W-17-1052 507.0 509.0 2.0 3.26   Caribou Extension Caribou
OSK-W-17-1056 87.5 90.5 3.0 3.89   Z27 Z27
  96.9 100.6 3.7 7.71   Z27 Z27
OSK-W-17-1062 110.5 116.2 5.7 3.25   Z27 (15m infill) Z27
OSK-W-17-1070 45.0 47.4 2.4 9.58   Z27 Z27
including 46.0 46.9 0.9 22.9  
OSK-W-17-1071 112.7 115.5 2.8 7.12   Z27 Z27
  139.5 141.7 2.2 12.1   Z27 Z27
  150.8 152.8 2.0 5.31  
  156.0 158.8 2.8 9.72  
  161.7 164.0 2.3 12.2  
OSK-W-17-1090 134.2 136.5 2.3 5.24   Z27 Z27
including 134.2 134.6 0.4 26.3  
OSK-W-17-1124 204.6 207.0 2.4 18.3   Mallard Mallard
including 204.6 205.6 1.0 43.4  
OSK-W-17-1185 246.7 249.5 2.8 3.61   TBD Z27
including 248.6 249.5 0.9 10.4  
OSK-W-17-1207 147.7 149.7 2.0 6.17   Mallard Mallard
including 148.0 148.7 0.7 16.0  
OSK-W-17-1210 209.5 211.6 2.1 4.26   Caribou Extension Caribou
OSK-W-17-1218 384.0 386.0 2.0 6.88   Caribou Extension Caribou
including 385.3 385.6 0.3 28.7  
OSK-W-17-1220 179.4 182.0 2.6 12.3   Z27 (15m infill) Z27
including 180.2 181.1 0.9 29.7  

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, QTV = Quartz-Tourmaline Vein
Hole Number Azimuth (°) Dip (°) Length (m) UTM E UTM N Section
OSK-W-17-847-W1 334 -69 1134 452645 5434429 2625
OSK-W-17-847-W2 334 -69 1275 452645 5434429 2625
OSK-W-17-855-W1 334 -64 1197 452309 5434384 2300
OSK-W-17-862-W2 332 -55 759 452683 5434577 2725
OSK-W-17-871-W1 328 -54 840 452402 5434623 2500
OSK-W-17-880 327 -50 813 452425 5434565 2500
OSK-W-17-880-W1 327 -50 801 452425 5434565 2500
OSK-W-17-880-W2 327 -50 846 452425 5434565 2500
OSK-W-17-885-W1 335 -67 1383 452861 5434494 2850
OSK-W-17-889 333 -57 786 452695 5434564 2725
OSK-W-17-903 329 -56 801 452539 5434692 2650
OSK-W-17-903-W1 329 -56 657 452539 5434692 2650
OSK-W-17-937 333 -57 935 452897 5434430 2850
OSK-W-17-975 334 -64 804 452862 5434814 3000
OSK-W-17-985 144 -49 225 452074 5434829 2350
OSK-W-17-989-W2 335 -56 743 452660 5434497 2675
OSK-W-17-990 147 -49 327 452122 5434815 2350
OSK-W-17-1014 141 -47 195 452063 5434811 2300
OSK-W-17-1018 333 -47 300 452247 5434865 2475
OSK-W-17-1028 326 -59 807 452860 5434814 3000
OSK-W-17-1035 133 -45 105 452101 5434747 2300
OSK-W-17-1042 146 -52 156 452119 5434786 2325
OSK-W-17-1052 328 -67 840 452999 5434855 3150
OSK-W-17-1055 148 -49 144 452091 5434739 2300
OSK-W-17-1056 150 -46 120 452003 5434746 2225
OSK-W-17-1062 147 -49 192 452009 5434774 2225
OSK-W-17-1070 141 -49 66 452023 5434702 2200
OSK-W-17-1071 146 -49 204 451983 5434774 2200
OSK-W-17-1090 334 -45 237 452219 5434643 2350
OSK-W-17-1124 331 -51 255 452015 5434776 2250
OSK-W-17-1185 334 -47 342 452904 5435021 3125
OSK-W-17-1207 334 -57 267 452147 5434924 2450
OSK-W-17-1210 334 -51 318 453011 5435050 3250
OSK-W-17-1218 327 -62 405 453004 5435009 3225
OSK-W-17-1220 141 -47 303 452025 5434811 2275

 

OSK-W-17-847-W1 intersected FW0 in the Underdog Corridor returning 13.1 g/t Au over 3.0 metres. Mineralization occurs as 3% pyrite stringers, 1% disseminated pyrite in a silicified and sericitized fragmental felsic intrusion with 2% quartz-tourmaline veinlets.

OSK-W-17-847-W2 intersected FW1 in the Underdog Corridor with 19.3 g/t Au over 3.5 metres.  Mineralization is composed of trace pyrite stringers and 1% disseminated pyrite in a silicified and sericitized felsic dike. High-grade values correspond with local visible gold in tourmaline-quartz veins within a weak silica flooding alteration zone. The interval is 80 metres down plunge of OSK-W-17-743 (3.37 g/t Au over 9.7 metres previously reported January 5, 2017).

OSK-W-17-855-W1 intersected two intervals within the Underdog Corridor: 13.5 g/t Au over 3.0 metres and 8.31 g/t Au over 2.0 metres.  Mineralization occurs as 5% disseminated pyrite and traces of pyrite-stringer within a silicified and sericitized felsic dike related to FW3 FW. The second interval is related to a decimetre scale quartz-tourmaline vein with 50% pyrite in the same silicified and sericitized felsic dike.

OSK-W-17-862-W2 intersected two zones: 17.8 g/t Au over 4.7 metres related to CS3 in the Caribou Corridor and 6.12 g/t Au over 2.2 metres related to Wolf HW.  The first interval corresponds with strongly fuchsitized and silicified andesite containing pyrite-tourmaline stringers and 30% semi massive pyrite. The second interval corresponds to 10% pyrite-tourmaline stringers and 4% pyrite clusters in a strongly sericitized porphyritic felsic dike.

OSK-W-17-871-W1 intersected 8.38 g/t Au over 2.3 metres. Mineralization is related to a quartz-tourmaline vein hosted in a felsic volcanic unit within the Underdog Corridor.

OSK-W-17-880 intersected two zones:  3.32 g/t Au over 3.2 metres related to the Caribou HW and 7.92 g/t Au over 2.5 meters related to Zone 27. The first interval is composed of 5% pyrite stringers and 1% disseminated pyrite within a sericitized rhyolite.  The second interval corresponds with traces of disseminated pyrite within a chloritized felsic intrusion.

OSK-W-17-880-W1 intersected 16.5 g/t Au over 3.0 metres in Zone 27 HW.  Mineralization is composed of 2% disseminated pyrite, traces pyrite-tourmaline stringers in a chloritized andesite.

OSK-W-17-880-W2 intersected 8.41 g/t Au over 2.7 metres in FW3U in the Underdog Corridor. Mineralization is composed of local visible gold, 1% disseminated pyrite, and 4% pyrite stringers in a silicified and sericitized felsic dike in contact with andesite.

OSK-W-17-885-W1 intersected 8.12 g/t Au over 2.0 metres related to the FW1 HW zone in the Underdog Corridor. Mineralization is composed of 2% pyrite stringers in a sericitized and silicified felsic dike with fuchsite. The interval is 135 metres down plunge to the north-east of OSK-W-17-821-W1 (4.63 g/t Au over 5.0 metres previously reported August 24, 2017).

OSK-W-17-889 intersected three intervals from Caribou Corridor:  6.79 g/t au over 2.5 metres and 19.2 g/t au over 2.5 metres related to the Wolf HW and 9.68 g/t Au over 2.0 metres related to Wolf. The mineralization is composed of 3-10% pyrite-tourmaline stringers hosted in silicified and sericitized andesite with trace of fuchsite.

OSK-W-17-903 returned 4.97 g/t Au over 7.5 metres related to CN2 FW zone within the Caribou Corridor. This interval corresponds with sericitized intermediate volcanics with traces of disseminated pyrite.

OSK-W-17-903-W1 returned 9.3 g/t Au over 2.0 metres related to CN2 FW zone within the Caribou Corridor. Mineralization is composed of 5% pyrite stringers hosted in a silicified porphyritic felsic intrusion.

OSK-W-17-937 returned 11.9 g/t Au over 2.0 metres related to CS3 zone within the Caribou Corridor.  Mineralization is composed of 15-20% pyrite stringers in a partially bleached and sericitized rhyolite. The interval is 40 metres east of OSK-W-17-715 (6.84 g/t Au over 3.0 metres previously reported August 31, 2017).

OSK-W-17-975 intersected 4.31 g/t Au over 7.8 metres in the Caribou Extension and 7.09 g/t Au over 2.2 meters in Zone 27 Extension. The mineralization is composed of up to 5% pyrite stringers, 5% disseminated pyrite hosted in a chloritized or sericitized andesite. This intersection in Zone 27 extends the zone 200 metres to the northeast from the previous resource boundary.

OSK-W-17-985 intersected 9.9 g/t Au over 4.6 metres.  Mineralization consists of up to 5% pyrite stringers, 15% disseminated pyrite hosted in a strongly silicified felsic dike with large quartz eyes.

OSK-W-17-989-W2 intersected 5.28 g/t Au over 2.7 metres related to CS3 Zone in the Caribou Corridor. Mineralization is composed of 5% pyrite stringers and 5% disseminated pyrite in a sericitized andesite.

OSK-W-17-990 intersected Zone 27 returning 3.25 g/t Au over 3.3 metres and 26.4 g/t Au over 2.7 metres.  Mineralization is composed of 1% pyrite stringers, 1% pyrite fragments, and local visible gold, chalcopyrite, and sphalerite hosted in a sericitized rhyolite.

OSK-W-17-1014 intersected Zone 27 returning 5.22 g/t Au over 2.1 metres. The mineralization is composed of quartz-tourmaline veins with 10% pyrite stringers at the contact between a porphyritic felsic dike and a sericitized rhyolite.

OSK-W-17-1018 intersected Mallard returning 3.55 g/t Au over 5.9 metres. Mineralization corresponds with 3% quartz-tourmaline veins, 2% tourmaline-pyrite veins, 30% pyrite stringers and local visible gold at the contact between the andesite and a sericitized, strongly silicified felsic dike.

OSK-W-17-1028 intersected three zones related to Caribou Extension: 11.6 g/t Au over 3.1 metres, 10.6 g/t Au over 2.3 metres, and 3.12 g/t Au over 3.1 metres. The first and second intervals correspond with silicified andesite with fuchsite containing 15% pyrite (clusters and stringers). The third interval is composed of 15% pyrite stringers and disseminated pyrite within a silicified rhyolite. Those intervals are 50 metres east of OBM-16-701 (5.14 g/t Au over 6.1 metres previously reported August 23, 2016).

OSK-W-17-1035 intersected 4.27 g/t Au over 2.6 metres related to Zone 27. Mineralization is composed of 7% pyrite stringers and pyrite clusters, associated with ptygmatic tourmaline stringer and strong silica patches, hosted in moderately sericitized and silicified rhyolite and felsic intrusive rock.

OSK-W-17-1042 infilled Zone 27: 3.39 g/t Au over 12.2 metres. Mineralization consists of up to 10-15% pyrite stringers and pyrite clusters, with local semi-massive decimetre scale pyrite bands within silica patches alteration hosted in moderately sericitized, silicified felsic intrusion.

OSK-W-17-1052 intersected 3.26 g/t Au over 2.0 metres in the Caribou Extension. Mineralization consists of trace of disseminated pyrite or in stringers hosted in chloritized and hematized andesite.

OSK-W-17-1056 intersected Zone 27 returning 3.89 g/t Au over 3.0 metres and 7.71 g/t Au over 3.7 metres. Mineralization is composed of 5-30% pyrite stringers, and 1% disseminated pyrite hosted in a sericitized, locally silicified rhyolite.

OSK-W-17-1062 infilled Zone 27: 3.25 g/t Au over 5.7 metres. Mineralization consists of 8% pyrite-chlorite stringers, 2% pyrite clusters, 1% pyrite-tourmaline stringers, and traces of pervasive silica flooding hosted in moderately to strongly silicified felsic intrusion.

OSK-W-17-1070 intersected Zone 27 returning 9.58 g/t Au over 2.4 metres. Mineralization is composed of disseminated pyrite in silica flooding patches hosted in a felsic intrusion.

OSK-W-17-1071 intersected Zone 27 on multiple intervals; 7.12 g/t Au over 2.8 metres; 12.1 g/t Au over 2.2 metres; 5.31 g/t Au over 2.0 metres; 9.72 g/t au over 2.8 metres; and 12.2 g/t Au over 2.3 metres. The first interval is composed of semi-massive pyrite and 1% pyrite stringers hosted in a silicified porphyritic felsic intrusion with large quartz eyes. The second and third intervals are composed of up to 4% disseminated pyrite, up to 1% pyrite stringers and trace of chalcopyrite within a strongly sericitized and silicified rhyolite. The two last intervals are at the upper and lower contact of a felsic dike. Mineralization is composed of disseminated pyrite and pyrite stringers.

OSK-W-17-1090 intersected 5.24 g/t Au over 2.3 metres related to Zone 27. Mineralization is composed of traces of pyrite stringers and 2% tourmaline-pyrite veins hosted in a sericitized felsic intrusion.

OSK-W-17-1124 intersected the Mallard Zone returning 18.3 g/t Au over 2.4 metres. Mineralization is composed of 10% pyrite in pervasive silica flooding within a strongly silicified felsic intrusion.

OSK-W-17-1185 intersected 3.61 g/t Au over 2.8 metres. Mineralization is composed of 2% disseminated pyrite, 1% pyrite-stringers and 2% pyrite-tourmaline stringers in moderately silicified and sericitized felsic porphyritic intrusive. This interval is potentially a new zone in the possible north-east extension of Zone 27.  Geometry is yet to be determined.

OSK-W-17-1207 intersected the Mallard Zone returning 6.17 g/t au over 2.0 metres. Mineralization is composed of 4% pyrite as stringers and clusters in association with quartz-carbonate veining and weakly developed crustiform vein hosted in andesite with moderate patchy sericitization and chloritization.

OSK-W-17-1210 intersected 4.26 g/t Au over 2.1 metres in the Caribou Extension. Mineralization is composed 3% of pyrite-tourmaline stringers, 2% of pyrite clusters and 2% disseminated pyrite in a strongly silicified fragmental andesite with fragments of rhyolite and local fuchsite.

OSK-W-17-1218 intersected 6.88 g/t Au over 2.0 metres. Mineralization is in the Caribou Extension and is composed of 15% of pyrite stringers, 3% disseminated pyrite, 2% pyrite clusters,1% disseminated chalcopyrite and tourmaline dismembered ptygmatic veins, all hosted in a sericitized, silicified rhyolite.

OSK-W-17-1220 intersected Zone 27 returning 12.3 g/t Au over 2.6 metres. Mineralization corresponds with a semi-massive band of pyrite (40%) with disseminated tourmaline hosted in a silicified rhyolite.

Qualified Person

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

Quality Control and Reporting Protocols

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

About the Windfall Lake Gold Deposit

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

About Osisko Mining Inc.

Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-dOr and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100% interest in the Marban project located in the heart of Québecs prolific Abitibi gold mining district, and properties in the Larder Lake Mining Division in northeast Ontario, including the Jonpol and Garrcon deposits on the Garrison property, the Buffonta past producing mine and the Gold Pike mine property. The Corporation also holds interests and options in a number of additional properties in northern Quebec and Ontario.  Osisko continues to be well financed with approximately $240 million in cash and investments.

Cautionary Note Regarding Forward-Looking Information

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

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