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

TORONTO, ONTARIO--(Marketwired - Nov. 14, 2017) - Osisko Mining Inc. (OSK.TO) ("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 d'Or, 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-d'Or 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-d'Or 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 Québec's 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", "management's 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 management's 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.