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.

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.

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”).

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