OSISKO INTERSECTS 115 g/t Au OVER 8.4 METRES AT LYNX

Posted on April 26, 2018November 8, 2023 by Yannick Fradette

Infill Drilling Continues to Encounter High-Grade Gold

(Toronto, April 26, 2018) 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 19 intercepts in 12 drill holes and 5 wedges focused on infill drilling in the Lynx deposit are presented below. Today’s infill drilling results will not be included in the pending mineral resource scheduled for release in May 2018.

Highlights from the new results include: 115 g/t Au over 8.4 metres in OSK-W-17-1363; 58.7 g/t Au over 5.1 metres in OSK-W-17-1343-W1; 118 g/t Au over 2.5 metres and 85.1 g/t Au over 2.0 metres in OSK-W-17-1169-W2; 72.8 g/t Au over 3.1 metres in OSK-W-17-1166; 68.8 g/t Au over 2.0 metres in OSK-W-17-928; 67.0 g/t Au over 2.0 metres in OSK-W-17-1396; 50.3 g/t Au over 2.3 metres in OSK-W-17-986; and 43.0 g/t Au over 2.6 metres in OSK-W-17-1320. 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-W-17-928	247.0	249.0	2.0	68.8	50	Lynx HW	Lynx
including	247.0	248.0	1.0	138	100	Lynx HW	Lynx
OSK-W-17-986	337.7	340.0	2.3	50.3	48.7	VNCR	Lynx
including	338.4	339.5	1.1	104	100	VNCR	Lynx
OSK-W-17-1166	973.0	976.1	3.1	72.8	14.9	Lynx 4	Lynx
including	974.4	974.8	0.4	549	100	Lynx 4	Lynx
OSK-W-17-1320	90.4	93.0	2.6	43.0	15.6	Vein	Lynx
including	91.3	91.7	0.4	278	100	Vein	Lynx
OSK-W-17-1343-W1	596.7	601.8	5.1	58.7	30.3	Lynx HW	Lynx
including	597.7	599.0	1.3	212	100	Lynx HW	Lynx
OSK-W-17-1363	373.6	382.0	8.4	115	24.0	Lynx 2	Lynx
including	377.0	377.7	0.7	1190	100
including	379.0	380.0	1.0	97.7
OSK-W-17-1396	873.0	875.0	2.0	67.0	15.3	Lynx 4	Lynx
including	873.8	874.1	0.3	445	100	Lynx 4	Lynx
OSK-W-18-1169-W1	564.0	566.1	2.1	7.84		Lynx 2	Lynx
OSK-W-18-1169-W2	908.1	910.6	2.5	118	49.7	Lynx 4	Lynx
including	908.4	909.0	0.6	386	100	Lynx 4	Lynx
	925.0	927.0	2.0	4.09		Lynx 4	Lynx
	1082.0	1084.0	2.0	85.1	46.9	Lynx 4	Lynx
including	1082.3	1083.2	0.9	185	100	Lynx 4	Lynx
OSK-W-18-1367-W2	878.0	882.0	4.0	4.55		Lynx	Lynx
OSK-W-18-1424	878.2	880.7	2.5	4.24		Lynx 4	Lynx
including	879.1	879.9	0.8	12.2		Lynx 4	Lynx
OSK-W-18-1432-W1	944.0	946.5	2.5	8.89		Lynx 4	Lynx
OSK-W-18-1443	584.0	586.0	2.0	4.25		Lynx HW	Lynx
including	584.4	585.0	0.6	13.7		Lynx HW	Lynx
OSK-W-18-1450	565.1	567.3	2.2	36.7		Lynx 2	Lynx
OSK-W-18-1454	896.1	898.7	2.6	17.0	16.4	Lynx 4	Lynx
including	896.1	896.5	0.4	104	100	Lynx 4	Lynx
OSK-W-18-1455	441.0	443.0	2.0	4.12		Lynx HW	Lynx
including	441.3	442.0	0.7	10.5		Lynx HW	Lynx
OSK-W-18-1460	332.0	337.4	5.4	4.50		Lynx HW	Lynx
including	332.0	332.5	0.5	20.3
including	337.0	337.4	0.4	28.5

Notes: True widths are estimated at 65 – 80% of the reported core length interval. See “Quality Control” below.
Definitions: HW = Hanging Wall; VNCR = Crustiform Vein.

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Section
OSK-W-17-928	333	-64	465	453433	5434905	3550
OSK-W-17-986	328	-66	360	453447	5435019	3600
OSK-W-17-1166	132	-59	1182	453621	5435639	4050
OSK-W-18-1169-W1	129	-55	1301	453332	5435467	3725
OSK-W-18-1169-W2	129	-55	1155	453332	5435467	3725
OSK-W-17-1320	328	-76	852	452906	5434846	3050
OSK-W-17-1343-W1	137	-56	870	453570	5435490	3950
OSK-W-17-1363	341	-72	513	453458	5435025	3625
OSK-W-18-1367-W2	131	-52	1224	453753	5435875	4300
OSK-W-17-1396	134	-52	956	453439	5435484	3825
OSK-W-18-1424	357	-57	930	453357	5434365	3200
OSK-W-18-1432-W1	132	-55	1149	453809	5435783	4300
OSK-W-18-1443	136	-50	792	453440	5435478	3825
OSK-W-18-1450	135	-53	660	453384	5435519	3800
OSK-W-18-1454	145	-53	1089	453375	5435455	3750
OSK-W-18-1455	140	-49	552	453568	5435492	3950
OSK-W-18-1460	143	-51	432	453468	5435347	3775

OSK-W-17-928 intersected 68.8 g/t Au over 2.0 metres in Lynx HW. Mineralization contains trace disseminated pyrite within a moderate sericite and weak silica altered rhyolite.

OSK-W-17-986 intersected a crustiform vein returning 50.3 g/t Au 2.3 metres. Mineralization contains local visible gold, 2% pyrite stringers, 2% crustiform quartz-carbonate veins and pyrite-silica flooding within a silica, carbonate and fuchsite altered gabbro.

OSK-W-17-1166 intersected 72.8 g/t Au over 3.1 metres in Lynx 4. Mineralization contains local visible gold, 10% pyrite-silica flooding and 3% pyrite-tourmaline stringers within a porphyritic felsic dike.

OSK-W-17-1320 intersected 43.0 g/t Au over 2.6 metres in Lynx. Mineralization contains 1% disseminated pyrite and trace pyrite in quartz veins within in a strong chlorite, moderate silica and weak sericite altered porphyritic felsic dike.

OSK-W-17-1343-W1 intersected 58.7 g/t Au over 5.1 metres in Lynx HW. Mineralization contains 3% pyrite-silica flooding, 1% pyrite-tourmaline stringers and a 10 centimetres quartz vein within a strong silica and moderate sericite altered porphyritic felsic dike.

OSK-W-17-1363 intersected 115 g/t Au over 8.4 metres in Lynx 2. Mineralization contains local visible gold and electrum and up to 25% disseminated pyrite or pyrite-tourmaline stringers within strong pervasive silica flooding. The gabbro host is strongly fuchsite and silica altered.

OSK-W-17-1396 intersected 67.0 g/t Au over 2.0 metres in Lynx 4. Mineralization contains 1% pyrite in quartz-tourmaline veins and 3% disseminated pyrite within a moderate sericite, moderate fuchsite and weak silica altered rhyolite.

OSK-W-18-1169-W1 intersected 7.84 g/t Au over 2.1 metres in Lynx 2. Mineralization contains 2% pyrite disseminated or as stringers and 10% quartz-carbonate and tourmalines veins within a silica and fuchsite altered gabbro.

OSK-W-18-1169-W2 intersected three intervals in Lynx 4: 118 g/t Au over 2.5 metres, 4.09 g/t Au over 2.0 metres and 85.1 g/t Au over 2.0 metres. The first interval contains local visible gold, up to 15% pyrite-tourmaline stringers and 1% disseminated pyrite within strong pervasive silica alteration at the contact between a silicified and sericitized gabbro and a sericitized rhyolite. The second interval contains local visible gold and 10% pyrite in smoky-quartz veins within a sericite altered rhyolite. The third interval contains local visible gold and 5% pyrite-tourmaline stringers within a strong silica, moderate sericite, moderate ankerite and weak fuchsite altered rhyolite.

OSK-W-18-1367-W2 intersected 4.55 g/t Au over 4.0 meters in Lynx Corridor. Mineralization contains 1% pyrite clusters and trace pyrite-silica flooding within a moderate chlorite and weak silica altered rhyolite.

OSK-W-18-1424 intersected 4.24 g/t Au over 2.5 metres in Lynx 4. Mineralization contains up to 2% pyrite-tourmaline and 1% pyrite in quartz-carbonate veins within a sericitized zone at the contact between a porphyritic felsic dike and a rhyolite.

OSK-W-18-1432-W1 intersected 8.89 g/t Au over 2.5 metres in Lynx 4. Mineralization contains up to 15% pyrite stringers at low core angles, 2% disseminated pyrite and traces of pyrite in ptygmatic tourmaline veins at the contact between a sericitized porphyritic felsic dike and a strongly bleached gabbro.

OSK-W-18-1443 intersected 4.25 g/t Au over 2.0 metres in Lynx HW. Mineralization contains 10% disseminated pyrite and trace pyrite clusters within a bleached, chloritized and silicified gabbro.

OSK-W-18-1450 intersected 36.7 g/t Au over 2.2 metres in Lynx 2. Mineralization contains up to 8% pyrite-silica flooding within a strong silica and weak sericite altered gabbro.

OSK-W-18-1454 intersected 17.0 g/t Au over 2.6 metres in Lynx 4. Mineralization is composed of 2% disseminated pyrite and quartz-tourmaline veins, and 1% pyrite-tourmaline stringers within a strong sericite altered rhyolite.

OSK-W-18-1455 intersected 4.12 g/t Au over 2.0 metres in Lynx HW. Mineralization contains up to 4% disseminated pyrite, up to 2% pyrite stringers and trace pyrite clusters at the contact between a fuchsite altered gabbro and a felsic porphyritic dike.

OSK-W-18-1460 intersected 4.50 g/t Au over 5.4 metres in Lynx HW. Mineralization contains 2% pyrite-silica flooding and 1% disseminated pyrite at the contact between a strong silica altered rhyolite and a felsic intrusion.

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 $190 million in cash and investments as of December 31, 2017.

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, expansion and exploration drilling in and around the main Windfall Lake gold deposit and the 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.

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

OSISKO INTERSECTS 41.2 g/t Au OVER 3.5 METRES AT WINDFALL

Posted on April 19, 2018November 8, 2023 by Yannick Fradette

Additional High-Grade Infill Holes in Caribou, Underdog and Bobcat

(Toronto, April 19, 2018) 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 46 intercepts in 23 drill holes and 5 wedges focused on infill drilling in the Main Windfall lake deposit are presented below. Today’s infill drilling results will not be included in the pending mineral resource scheduled for release in May 2018.

Highlights from the new results include: 82.5 g/t Au over 2.0 metres in OSK-W-17-1391; 41.2 g/t Au over 3.5 metres in OSK-W-18-1402-W3; 34.3 g/t Au over 2.6 metres in OSK-W-18-1435; 31.4 g/t Au over 2.7 metres in OSK-W-18-1440; 5.53 g/t Au over 11.9 metres in OSK-W-17-801; and 24.0 g/t Au over 2.4 metres in OSK-W-17-1409. 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-EAG-12-333	787.0	789.0	2.0	5.38		FW3	Underdog
including	787.8	788.1	0.3	34.7		FW3	Underdog
OSK-EAG-12-424	832.6	835.1	2.5	6.72		FW3	Underdog
OSK-W-17-801	688.1	691.0	2.9	7.75		Caribou Ext.	Caribou
	697.0	699.4	2.4	3.70		Caribou Ext.	Caribou
	758.5	770.4	11.9	5.53		Caribou Ext.	Caribou
including	758.5	762.0	3.5	10.6		Caribou Ext.	Caribou
	777.0	781.4	4.4	3.92		Caribou Ext.	Caribou
OSK-W-17-1371	722.1	724.6	2.5	3.96		Vein	Wolf
including	724.0	724.6	0.6	15.6		Vein	Wolf
OSK-W-17-1378	229.9	232.0	2.1	4.41		Caribou	Caribou
	336.9	339.4	2.5	5.36		Caribou	Caribou
OSK-W-17-1379	485.0	487.3	2.3	3.03		Caribou Ext.	Caribou
OSK-W-17-1391	501.0	503.0	2.0	82.5	35.6	Vein	Caribou
including	501.0	501.7	0.7	234	100	Vein	Caribou
OSK-W-17-1394	780.5	782.6	2.1	4.25		Caribou Ext.	Caribou
including	781.0	781.6	0.6	14.7		Caribou Ext.	Caribou
OSK-W-17-1397	639.0	641.0	2.0	3.53		VNCR	Caribou
	711.0	713.2	2.2	3.69		Vein	Caribou
OSK-W-17-1399	658.5	661.0	2.5	4.45		Caribou Ext.	Caribou
OSK-W-17-1406	117.0	119.0	2.0	7.28		Vein	Bobcat
including	117.0	118.0	1.0	13.8		Vein	Bobcat
	129.0	131.0	2.0	6.91		QTV	Bobcat
including	129.4	130.3	0.9	15.2		QTV	Bobcat
OSK-W-17-1409	133.3	135.7	2.4	24.0	13.6	Bobcat	Bobcat
including	135.4	135.7	0.3	184	100	Bobcat	Bobcat
	205.0	207.0	2.0	6.11		Bobcat	Bobcat
including	205.4	206.0	0.6	19.5		Bobcat	Bobcat
	350.0	352.4	2.4	7.17		Caribou Ext.	Caribou
including	351.0	351.5	0.5	34.1		Caribou Ext.	Caribou
OSK-W-18-1066-W1	944.4	946.4	2.0	12.9		FW3	Underdog
including	945.0	945.7	0.7	36.0		FW3	Underdog
	1008.2	1010.4	2.2	21.0		FW3 FW	Underdog
including	1008.8	1009.1	0.3	81.6		FW3 FW	Underdog
OSK-W-18-1402-W1	826.5	833.1	6.6	4.07		FW1	Underdog
OSK-W-18-1402-W3	778.0	780.3	2.3	8.11		FW0	Underdog
including	779.2	779.7	0.5	25.5		FW0	Underdog
	821.1	824.6	3.5	6.21		FW1	Underdog
	880.0	882.0	2.0	4.98		FW1 FW	Underdog
including	881.0	881.7	0.7	12.3		FW1 FW	Underdog
	888.5	892.0	3.5	41.2		FW1 FW	Underdog
including	888.5	890.0	1.5	65.9		FW1 FW	Underdog
	1104.7	1109.4	4.7	9.36		FW3	Underdog
including	1104.7	1105.1	0.4	35.4
including	1109.1	1109.4	0.3	96.1
OSK-W-18-1423	509.8	512.0	2.2	5.63		Caribou Ext.	Caribou
including	509.8	510.5	0.7	17.3		Caribou Ext.	Caribou
OSK-W-18-1430	707.5	709.5	2.0	7.91		FW1	Underdog
including	708.3	708.9	0.6	23.1		FW1	Underdog
OSK-W-18-1430-W1	818.0	821.0	3.0	4.95		FW2	Underdog
OSK-W-18-1431	1070.0	1072.0	2.0	5.73		FW4	Underdog
OSK-W-18-1431-W1	758.0	760.3	2.3	3.06		FW1	Underdog
	967.8	969.9	2.1	13.5		FW3 FW	Underdog
including	969.2	969.9	0.7	28.0		FW3 FW	Underdog
OSK-W-18-1434	859.5	864.2	4.7	11.6		FW3	Underdog
including	859.5	860.0	0.5	63.4
including	863.8	864.2	0.4	45.5
	960.0	962.4	2.4	16.0		FW3U	Underdog
including	962.0	962.4	0.4	68.7		FW3U	Underdog
OSK-W-18-1435	532.0	534.6	2.6	34.3	24.7	Caribou Ext.	Caribou
including	533.3	533.9	0.6	142	100	Caribou Ext.	Caribou
	539.0	541.0	2.0	4.38		Caribou Ext.	Caribou
including	540.2	540.5	0.3	29.0		Caribou Ext.	Caribou
OSK-W-18-1440	729.3	732.0	2.7	31.4	26.7	FW1	Underdog
including	730.3	731.0	0.7	118	100	FW1	Underdog
OSK-W-18-1441	181.0	187.6	6.6	8.06		Bobcat	Bobcat
OSK-W-18-1445	531.9	535.4	3.5	5.75		Caribou Ext.	Caribou
OSK-W-18-1446	679.0	682.2	3.2	10.8		FW1	Underdog
including	680.2	680.8	0.6	32.6		FW1	Underdog
	761.0	763.0	2.0	4.27		FW2	Underdog
including	761.7	762.4	0.7	12.1		FW2	Underdog
	794.6	796.8	2.2	4.05		FW3	Underdog
including	795.2	796.0	0.8	11.0		FW3	Underdog
OSK-W-18-1448	263.0	265.0	2.0	6.02		Caribou	Caribou
OSK-W-18-1459	180.0	182.0	2.0	8.26		VNCR	Bobcat

Notes:

True widths are estimated at 65 – 80% of the reported core length interval. See “Quality Control”
Definitions: Ext = extension, FW = Footwall, QTV = Quartz-Tourmaline Vein, U = Upper, VNCR = Crustiform Vein

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Section
OSK-EAG-12-333	333	-58	983	452459	5434565	2525
OSK-EAG-12-424	330	-55	1003	452598	5434580	2650
OSK-W-17-801	333	-69	840	453192	5434907	3325
OSK-W-17-1371	334	-69	981	453100	5434875	3225
OSK-W-17-1378	331	-56	741	452688	5434638	2750
OSK-W-17-1379	332	-66	540	452781	5434772	2900
OSK-W-17-1391	327	-62	663	452981	5434900	3150
OSK-W-17-1394	335	-49	1165	453146	5434512	3100
OSK-W-17-1397	333	-61	732	453300	5434964	3450
OSK-W-17-1399	332	-61	1053	453411	5434870	3500
OSK-W-17-1406	334	-60	579	452911	5434879	3075
OSK-W-17-1409	331	-53	402	452747	5434881	2925
OSK-W-18-1066-W1	332	-56	1137	452488	5434436	2475
OSK-W-18-1402-W1	330	-59	1224	452616	5434449	2600
OSK-W-18-1402-W3	330	-59	1182	452616	5434449	2600
OSK-W-18-1423	327	-61	792	453025	5434853	3150
OSK-W-18-1430	339	-60	984	452318	5434380	2300
OSK-W-18-1430-W1	339	-60	1125	452318	5434380	2300
OSK-W-18-1431	337	-62	1128	452287	5434336	2250
OSK-W-18-1431-W1	337	-62	1092	452287	5434336	2250
OSK-W-18-1434	335	-55	1026	452452	5434496	2475
OSK-W-18-1435	331	-65	801	453028	5434848	3150
OSK-W-18-1440	329	-57	870	452418	5434448	2425
OSK-W-18-1441	328	-60	441	452886	5434912	3075
OSK-W-18-1445	337	-66	660	452892	5434867	3050
OSK-W-18-1446	335	-48	987	452257	5434332	2225
OSK-W-18-1448	333	-52	483	452688	5434808	2850
OSK-W-18-1459	132	-50	621	452860	5435186	3175

OSK-EAG-12-333 intersected 5.38 g/t Au over 2.0 metres in FW3. Mineralization is composed of 7% pyrite-silica flooding and up to 1% pyrite stringers within a strong silica, weak sericite altered felsic porphyritic dike.

OSK-EAG-12-424 intersected 6.72 g/t Au over 2.5 metres in FW3. Mineralization is composed of up to 5% pyrite stringers, 1% pyrite clusters and quartz veins within a moderate sericitized felsic porphyritic dike.

OSK-W-17-801 intersected four intervals in Caribou Extension: 7.75 g/t Au over 2.9 metres, 3.70 g/t Au over 2.4 metres, 5.53 g/t Au over 11.9 metres and 3.92 g/t Au over 4.4 metres. The first and second intervals are composed of up to 5% pyrite stringers and semi-massive pyrite within a strong sericite altered andesite. In the third and fourth intervals, mineralization is composed of up to 3% pyrite stringers, 3% pyrite clusters and 1% disseminated pyrite at the contact between a strong chlorite altered andesite and a strong sericite altered felsic porphyritic dike. These two intervals are 100 metres down plunge of OSK-W-17-1351 (3.65 g/t Au over 2.2 metres and 3.64 g/t Au over 2.3 metres previously reported January 18, 2018).

OSK-W-17-1371 intersected 3.96 g/t Au over 2.5 metres in Wolf. Mineralization is hosted in a quartz vein and composed of up to 2% disseminated pyrite within a strong chlorite altered andesite.

OSK-W-17-1378 intersected two intervals in Caribou: 4.41 g/t Au over 2.1 metres and 5.36 g/t Au over 2.5 metres. The first interval is composed of 1% pyrite stringers within strong chlorite, and weak fuchsite altered felsic porphyritic dike. The second interval is composed of trace disseminated or stringer pyrite and quartz-tourmaline veins within a strong chlorite altered andesite.

OSK-W-17-1379 intersected 3.03 g/t Au over 2.3 metres in Caribou Extension. Mineralization is composed of trace pyrite stringer and chalcopyrite within a felsic porphyritic dike.

OSK-W-17-1391 intersected 82.5 g/t Au over 2.0 metres in Caribou. Mineralization is composed of 1% pyrite stringers and quartz vein within a chloritized andesite.

OSK-W-17-1394 intersected 4.25 g/t Au over 2.1 metres in Caribou Extension. Mineralization is composed of 2% pyrite stringers, 1% disseminated pyrite within a strong sericite altered rhyolite.

OSK-W-17-1397 intersected two veins in Caribou returning 3.53 g/t Au over 2.0 metre and 3.69 g/t Au over 2.2 metres. Both intersects are composed of up to 15% disseminated pyrite hosted in quartz veins within a strong silica, strong sericite and moderate chlorite altered rhyolite.

OSK-W-17-1399 intersected 4.45 g/t Au over 2.5 metres in Caribou Extension. Mineralization is composed of 2% pyrite clusters and quartz veins within a weak sericite altered rhyolite layered with gabbro.

OSK-W-17-1406 intersected two intervals in Bobcat: 7.28 g/t Au over 2.0 metres and 6.91 g/t Au over 2.0 metres. Both intersects are composed of up to 4% disseminated pyrite and quartz-tourmaline crustiform veins within a weak sericite altered gabbro.

OSK-W-17-1409 intersected three intervals: 24.0 g/t Au over 2.4 metres and 6.11 g/t Au over 2.0 metres in Bobcat and 7.17 g/t Au over 2.4 metres in Caribou Extension. The first two intervals are composed of trace disseminated and stringer pyrite and quartz-tourmaline veins within a strong sericite and silica altered rhyolite. The last interval is composed of trace disseminated pyrite and quartz-tourmaline veins within a strong chlorite and weak sericite altered rhyolite.

OSK-W-18-1066-W1 intersected two intervals: 12.9 g/t Au over 2.0 metres in FW3 and 21.0 g/t Au over 2.2 metres in FW3 Footwall. The first interval is composed of 35% semi-massive pyrite within a strong sericite altered felsic porphyritic dike. The second interval is composed of 10% pyrite stringers and pyrite-silica flooding within a moderate sericite altered felsic porphyritic dike.

OSK-W-18-1402-W1 intersected 4.07 g/t Au over 6.6 metres in FW1. Mineralization is composed of up to 2% pyrite in stockwork and stringers within a strong sericite altered felsic porphyritic dike.

OSK-W-18-1402-W3 intersected five intervals: 8.11 g/t Au over 2.3 metres in FW0, 6.21 g/t Au over 3.5 metres in FW1, 4.98 g/t Au over 2.0 metres and 41.2 g/t Au over 3.5 metres in FW1 FW, and 9.36 g/t Au over 4.7 metres in FW3. The first interval is composed of up to 15% pyrite in pyrite-silica flooding, stringers and disseminated within a strong sericite altered felsic porphyritic dike. The second interval is composed of up to 3% pyrite-silica flooding, 1% chalcopyrite and quartz veins within a strong silica and sericite altered felsic porphyritic dike. The third and fourth intervals are composed of up to 20% pyrite-silica flooding, up to 2% chalcopyrite, 1% quartz-tourmaline veins and local visible gold within strong silica and strong sericite altered felsic porphyritic dikes. The last interval is composed of 10% pyrite stringers, 2% disseminated pyrite and local visible gold within a strong sericite and strong silica altered felsic porphyritic dike.

OSK-W-18-1423 intersected 5.63 g/t Au over 2.2 metres in Caribou Extension. Mineralization is composed of 1% stringer and disseminated pyrite within a strong sericite altered andesite.

OSK-W-18-1430 intersected 7.91 g/t Au over 2.0 metres in FW1. Mineralization is composed of up to 30% semi-massive pyrite in stringers or pyrite-silica flooding and 5% disseminated pyrite within a moderate sericite altered felsic porphyritic dike.

OSK-W-18-1430-W1 intersected 4.95 g/t Au over 3.0 metres in FW2. Mineralization is composed of low core angle quartz-tourmaline veins with 2 % disseminated pyrite within a felsic porphyritic dike.

OSK-W-18-1431 intersected 5.73 g/t Au over 2.0 metres in FW4. Mineralization is composed of 2% pyrite stringers, 1% pyrite clusters within a strong sericite altered felsic porphyritic dike.

OSK-W-18-1431-W1 intersected two intervals: 3.06 g/t Au over 2.3 metres in FW1 and 13.5 g/t Au over 2.1 metres in FW3 FW. Both intersects are composed of up to 3% pyrite stringers, 2% disseminated pyrite and 1% pyrite clusters within strong sericite altered felsic porphyritic dikes.

OSK-W-18-1434 intersected two intervals: 11.6 g/t Au over 4.7 metres in FW3 and 16.0 g/t Au over 2.4 metres in FW3U. The first interval is composed of up to 15% pyrite stringers, pyrite-silica flooding, and local visible gold within a strong sericite and strong silica altered felsic porphyritic dike. The second interval is composed of 15% semi-massive pyrite, pyrite-tourmaline veins within a strong sericite altered felsic porphyritic dike.

OSK-W-18-1435 intersected two intervals in Caribou Extension: 34.3 g/t Au over 2.6 metres and 4.38 g/t Au over 2.0 metres. The first interval is composed of 80% massive pyrite veins and quartz-tourmaline veins within a strong chlorite, weak sericite and weak carbonate altered andesite. The second interval is composed of 15% pyrite stringers within a strong carbonate altered andesite.

OSK-W-18-1440 intersected 31.4 g/t Au over 2.7 metres in FW1. Mineralization is composed of up to 25% semi-massive pyrite, 5% pyrite-tourmaline veins, and local visible gold within a strong sericite and strong silica altered felsic porphyritic dike.

OSK-W-18-1441 intersected 8.06 g/t Au over 6.6 metres in Bobcat. Mineralization is composed of 7% disseminated pyrite and 3% pyrite-tourmaline stringers within a strong fuchsite and silica altered gabbro.

OSK-W-18-1445 intersected 5.75 g/t Au over 3.5 metres in Caribou Extension. Mineralization is composed of local visible gold and up to 35% pyrite in stringers, pyrite-tourmaline veins and clusters within a strong sericite and silica altered felsic porphyritic dike.

OSK-W-18-1446 intersected three intervals: 10.8 g/t Au over 3.2 metres in FW1, 4.27 g/t Au over 2.0 metres in FW2 and 4.05 g/t Au over 2.2 metres in FW3. The first interval is composed of up to 5% disseminated pyrite and pyrite-tourmaline veins and local visible gold within a strong silica and sericite altered felsic porphyritic dike. The second interval is composed of 3% disseminated pyrite in quartz-tourmaline veins within a moderate sericite altered felsic porphyritic dike. The last interval is composed of local visible gold, up to 5% pyrite stringers and pyrite-silica flooding within a strong silica altered felsic porphyritic dike.

OSK-W-18-1448 intersected 6.02 g/t Au over 2.0 metres in Caribou. Mineralization is composed of 9% pyrite stringers within a moderate silica and sericite altered felsic porphyritic dike.

OSK-W-18-1459 intersected 8.26 g/t Au over 2.0 metres in Bobcat. Mineralization is in a crustiform vein and composed of up to 3% disseminated pyrite within a strong silica and moderate fuchsite altered 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 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 $190 million in cash and investments as of December 31, 2017.

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.

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

OSISKO INTERSECTS 68.5 g/t Au OVER 2.9 METRES AT LYNX

Posted on April 17, 2018November 8, 2023 by Yannick Fradette

Infill Drilling Continues to Encounter High-Grade Gold

(Toronto, April 17, 2018) 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 17 intercepts in 5 drill holes and 6 wedges focused on infill drilling in the Lynx deposit are presented below. Today’s infill drilling results will not be included in the pending mineral resource scheduled for release in May 2018.

Highlights from the new results include: 68.9 g/t Au over 2.9 metres in OSK-W-18-1443; 33.8 g/t Au over 5.0 metres and 48.0 g/t Au over 2.0 metres in OSK-W-18-1436; 80.0 g/t Au over 2.1 metres in OSK-W-18-1367-W2 and 28.0 g/t Au over 3.0 metres in OSK-W-17-1397. 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-W-17-1166-W4	672.0	674.0	2.0	11.1		Lynx 2	Lynx
OSK-W-17-1343-W2	937.0	939.0	2.0	3.59		Lynx 4	Lynx
	1134.0	1137.0	3.0	6.31		Lynx 6	Lynx
OSK-W-17-1396	707.0	709.5	2.5	5.80		Lynx 4	Lynx
OSK-W-17-1397	113.6	116.0	2.4	3.35		Lynx HW	Lynx
including	114.7	115.1	0.4	16.8		Lynx HW	Lynx
	128.6	131.6	3.0	28.0	21.2	Lynx 1	Lynx
including	128.6	128.9	0.3	98.7
including	130.9	131.2	0.3	168	100
	173.0	175.0	2.0	5.38		Lynx 2	Lynx
including	173.0	174.0	1.0	10.7		Lynx 2	Lynx
OSK-W-18-923-W2	895.0	897.2	2.2	5.32		Lynx 4	Lynx
including	895.8	896.1	0.3	38.5		Lynx 4	Lynx
	911.1	917.0	5.9	10.1		Lynx 4	Lynx
including	916.2	917.0	0.8	60.8		Lynx 4	Lynx
OSK-W-18-1169-W1	888.0	890.0	2.0	7.69		Lynx 4	Lynx
including	889.2	889.6	0.4	31.6		Lynx 4	Lynx
OSK-W-18-1367-W2	1169.6	1171.7	2.1	80.0	22.8	Lynx 4	Lynx
including	1171.4	1171.7	0.3	501	100	Lynx 4	Lynx
OSK-W-18-1414-W2	1039.0	1041.0	2.0	5.38		Lynx 4	Lynx
including	1039.0	1039.9	0.9	11.6		Lynx 4	Lynx
OSK-W-18-1429	688.4	690.5	2.1	16.9		Lynx HW	Lynx
including	690.1	690.5	0.4	41.7		Lynx HW	Lynx
OSK-W-18-1436	902.5	904.5	2.0	8.40		Lynx 4	Lynx
including	903.3	903.6	0.3	49.8		Lynx 4	Lynx
	1062.3	1064.3	2.0	48.0	25.2	Lynx 4	Lynx
including	1063.8	1064.3	0.5	191		Lynx 4	Lynx
	1069.2	1074.2	5.0	33.8		Lynx 4	Lynx
including	1069.2	1069.8	0.6	97.6		Lynx 4	Lynx
OSK-W-18-1443	668.0	670.9	2.9	68.5	45.1	Lynx 4	Lynx
including	668.9	669.9	1.0	168	100	Lynx 4	Lynx

Notes: True widths are estimated at 65 – 80% of the reported core length interval. See “Quality Control” below.
Definitions: HW = Hanging Wall.

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Section
OSK-W-17-1166-W4	132	-59	1236	453621	5435639	4050
OSK-W-17-1343-W2	137	-56	1323	453570	5435490	3950
OSK-W-17-1396	134	-52	956	453439	5435484	3825
OSK-W-17-1397	333	-61	732	453300	5434964	3450
OSK-W-18-923-W2	137	-56	1164	453607	5435603	4025
OSK-W-18-1169-W1	129	-55	1301	453332	5435467	3725
OSK-W-18-1367-W2	131	-52	1224	453753	5435875	4300
OSK-W-18-1414-W2	133	-58	1095	453654	5435648	4100
OSK-W-18-1429	138	-49	820	453533	5435606	3975
OSK-W-18-1436	139	-52	1128	453372	5435509	3775
OSK-W-18-1443	136	-50	792	453440	5435478	3825

OSK-W-17-1166-W4 intersected 11.1 g/t Au over 2.0 metres in Lynx 2. Mineralization is composed of up to 5% interstitial and stringer pyrite within a moderately sericitized felsic fragmental intrusion.

OSK-W-17-1343-W2 intersected two intervals: 3.59 g/t Au over 2.0 metres in Lynx 4 and 6.31 g/t Au over 3.0 metres in Lynx 6. The first interval is composed of 1% pyrite stringers within a sericitized rhyolite. The second interval is composed of up to 1% disseminated and stringer pyrite and quartz-carbonate veins within a strong chlorite, weak sericite altered rhyolite.

OSK-W-17-1396 intersected 5.80 g/t Au over 2.5 metres in the Lynx 4. Mineralization is composed of up to 1% pyrite in quartz veins at a chlorite and fuchsite altered contact between a gabbro and rhyolite.

OSK-W-17-1397 intersected three intervals: 3.35 g/t Au over 2.4 metres in Lynx HW, 28.0 g/t Au over 3.0 metres in Lynx 1 and 5.38 g/t Au over 2.0 metres in Lynx 2. The first interval is composed of stringer and disseminated pyrite and quartz veins within a strong sericite altered rhyolite. The second interval is composed of up to 3% disseminated pyrite and pyrite-silica flooding within a strong silica altered rhyolite. The last interval is composed of up to 2% pyrite in fragments or disseminated within a strong sericite, strong carbonate altered felsic fragmental dike.

OSK-W-18-923-W2 intersected two intervals in Lynx 4: 5.32 g/t Au over 2.2 metres and 10.1 g/t Au over 5.9 metres. In the first interval, mineralization is composed of 20% pyrite in quartz-tourmaline veins and disseminated within a fuchsite altered gabbro. The second interval is composed of 5% disseminated pyrite and 5% pyrite-silica flooding within a strongly sericitized rhyolite.

OSK-W-18-1169-W1 intersected 7.69 g/t Au over 2.0 metres in Lynx 4. Mineralization is composed of up to 5% pyrite stringers and 1% quartz-tourmaline veins within a strong silica, moderate sericite altered rhyolite.

OSK-W-18-1367-W2 intersected 80.0 g/t Au over 2.1 metres in Lynx 4. Mineralization is composed of 5% pyrite stringers and 1% quartz-tourmaline veins within a moderate sericite and chlorite altered felsic porphyritic dike.

OSK-W-18-1414-W2 intersected 5.38 g/t Au over 2.0 metres in Lynx 4. Mineralization is composed of 10% disseminated pyrite and 1% ptygmatic tourmaline veins at the contact of moderate silica and fuchsite altered gabbro.

OSK-W-18-1429 intersected 16.9 g/t Au over 2.1 metres in Lynx HW. Mineralization is composed of 5% pyrite stringers and 5% disseminated pyrite and local visible gold within strong silica, strong sericite and weak fuchsite altered gabbro.

OSK-W-18-1436 intersected three intervals in Lynx 4: 8.40 g/t Au over 2.0 metres, 48.0 g/t Au over 2.0 metres and 33.8 g/t Au over 5.0 metres. The first interval is composed of up to 5% pyrite-silica flooding with local visible gold within a strong silica altered rhyolite. The second interval is composed of up to 10% pyrite stringers, 5% pyrite-silica flooding and local visible gold within a strong silica altered rhyolite. The last interval is composed of 10% pyrite-silica flooding and local visible gold within a strong silica altered rhyolite.

OSK-W-18-1443 intersected 68.5 g/t Au over 2.9 metres in Lynx 4. The mineralization is composed of 15% pyrite-silica flooding and 15% disseminated pyrite within a moderate silica, sericite, carbonate and fuchsite altered gabbro.

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

OSISKO INTERSECTS 40.8 g/t Au OVER 4.1 METRES AT WINDFALL

Posted on April 10, 2018November 8, 2023 by Yannick Fradette

Underdog FW4 Zone Continues to Expand

(Toronto April 10, 2018) 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 31 intercepts in 14 drill holes and 6 wedges focused on infill and expansion drilling in the Main Windfall lake deposit are presented below.

Highlights from the new results include: 40.8 g/t Au over 4.1 metres in OSK-W-18-823-W2; 53.9 g/t Au over 2.9 metres in OSK-W-18-1402-W2; 36.1 g/t Au over 3.2 metres in OSK-W-18-1431 and 32.8 g/t Au over 2.3 metres in OSK-W-18-1435. 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-EAG-12-424	802.9	805.3	2.4	7.85		FW3	Underdog
including	804.7	805.3	0.6	28.5		FW3	Underdog
	815.5	818.0	2.5	10.0		FW3	Underdog
including	816.0	817.0	1.0	20.9		FW3	Underdog
OSK-W-16-706-W3	1027.0	1029.2	2.2	7.88		FW2	Underdog
including	1028.0	1028.7	0.7	20.3		FW2	Underdog
OSK-W-17-943	610.8	616.0	5.2	3.25		Wolf HW	Wolf
OSK-W-17-967	603.0	605.0	2.0	23.2	15.3	Caribou Ext.	Caribou
including	603.5	603.8	0.3	153	100	Caribou Ext.	Caribou
	655.8	660.3	4.5	10.2		Caribou Ext.	Caribou
including	658.1	658.5	0.4	45.8		Caribou Ext.	Caribou
OSK-W-17-1139	953.8	956.0	2.2	4.44		FW3	Underdog
OSK-W-17-1308-W1	997.0	999.0	2.0	7.27		Wolf	Wolf
OSK-W-17-1336-W1	1153.5	1161.0	7.5	6.12		FW3	Underdog
including	1157.0	1158.0	1.0	17.0		FW3	Underdog
OSK-W-17-1352	646.0	648.0	2.0	9.39		Caribou Ext.	Caribou
including	646.8	647.5	0.7	26.4		Caribou Ext.	Caribou
OSK-W-17-1368	236.0	238.0	2.0	3.77		Caribou Ext.	Caribou
	270.9	273.0	2.1	8.05		Caribou Ext.	Caribou
including	270.9	271.2	0.3	54.0		Caribou Ext.	Caribou
OSK-W-17-1369	212.0	218.3	6.3	5.67		Caribou	Caribou
OSK-W-17-1371	565.0	567.0	2.0	3.19		Caribou Ext.	Caribou
including	565.3	565.7	0.4	14.8		Caribou Ext.	Caribou
OSK-W-17-1378	695.0	697.0	2.0	4.03		Vein	Zone 27
including	696.0	696.4	0.4	16.8		Vein	Zone 27
	720.2	722.5	2.3	9.26		Vein
including	721.3	721.7	0.4	52.8		Vein
OSK-W-17-1402	1054.2	1059.2	5.0	5.38		FW3	Underdog
	1085.0	1087.0	2.0	4.09		FW3	Underdog
	1099.0	1101.0	2.0	4.99		FW3	Underdog
OSK-W-18-762-W1	1220.0	1222.0	2.0	11.1		FW4	Underdog
including	1221.0	1221.5	0.5	41.5		FW4	Underdog
OSK-W-18-823-W2	843.7	846.0	2.3	11.7		FW1	Underdog
including	845.0	845.3	0.3	80.5		FW1	Underdog
	858.4	862.5	4.1	40.8	29.3	FW1	Underdog
including	860.8	861.7	0.9	152	100	FW1	Underdog
OSK-W-18-1402-W1	853.0	855.0	2.0	3.52		FW1	Underdog
	859.1	862.0	2.9	53.9		FW1	Underdog
	1088.9	1091.5	2.6	6.63		FW3	Underdog
including	1090.3	1090.8	0.5	26.9		FW3	Underdog
	1150.6	1153.0	2.4	4.47		FW4	Underdog
including	1150.6	1151.1	0.5	12.8		FW4	Underdog
OSK-W-18-1421	872.6	875.8	3.2	36.1		FW4	Underdog
including	874.5	875.5	1.0	81.8		FW4	Underdog
OSK-W-18-1431	894.0	896.0	2.0	3.57		FW2	Underdog
including	894.8	895.2	0.4	17.6		FW2	Underdog
	922.3	925.1	2.8	13.5		FW3	Underdog
including	923.2	924.3	1.1	32.1		FW3	Underdog
OSK-W-18-1435	301.5	303.8	2.3	32.8	31.1	Bobcat	Bobcat
including	302.1	302.8	0.7	106	100	Bobcat	Bobcat
OSK-W-18-1441	304.0	306.8	2.8	3.41		Bobcat	Bobcat

Notes: True widths are estimated at 65 – 80% of the reported core length interval. See “Quality Control” below.
Definitions: HW = Hanging Wall, Ext = extension.

President and CEO John Burzynski commented: “Good results again from our drilling at Windfall as we look forward to our initial mineral resource estimate on schedule for delivery in May. Although today’s results are outside the cut-off date and won’t be included in the mineral resource calculation in mid-March, they will add to the upside potential of Windfall as we head towards the feasibility study in early 2019. Particularly encouraging is that we are still seeing expansion potential in all of the main zones at Windfall-Lynx underscored in today’s results with the extension of the Underdog FW4 Zone by 70 metres up plunge from the previous mineralized intercept.”

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Section
OSK-EAG-12-424	330	-55	1003	452598	5434580	2650
OSK-W-16-706-W3	327	-57	1061	452611	5434418	2575
OSK-W-17-943	331	-55	744	452660	5434495	2675
OSK-W-17-967	337	-62	720	453176	5434908	3300
OSK-W-17-1139	333	-56	1092	452473	5434470	2500
OSK-W-17-1308-W1	332	-53	1032	453209	5434467	3125
OSK-W-17-1336-W1	335	-61	1335	452616	5434449	2600
OSK-W-17-1352	327	-50	909	453379	5434741	3400
OSK-W-17-1368	330	-64	762	452953	5434874	3100
OSK-W-17-1369	330	-49	786	452435	5434680	2550
OSK-W-17-1371	334	-69	981	453100	5434875	3225
OSK-W-17-1378	331	-56	741	452688	5434638	2750
OSK-W-17-1402	330	-59	1122	452616	5434449	2600
OSK-W-18-762-W1	332	-56	1299	452730	5434409	2675
OSK-W-18-823-W2	330	-56	918	452565	5434414	2550
OSK-W-18-1402-W1	330	-59	1224	452616	5434449	2600
OSK-W-18-1421	340	-47	918	452216	5434360	2200
OSK-W-18-1431	337	-62	1128	452287	5434336	2250
OSK-W-18-1435	331	-65	801	453028	5434848	3150
OSK-W-18-1441	328	-60	441	452886	5434912	3075

OSK-EAG-12-424 intersected two intervals in FW3: 7.85 g/t Au over 2.4 metres and 10.0 g/t Au over 2.5 metres. The first interval is composed of up to 2% disseminated pyrite and 1% pyrite stringers at the contact between a chloritized andesite and a sericitized porphyritic dike. The second interval contains up to 2% pyrite and pyrite-tourmaline stringers within a strongly sericitized andesite with moderate fuchsite alteration.

OSK-W-16-706-W3 intersected FW2 returning 7.88 g/t Au over 2.2 metres in the Underdog Corridor. Mineralization is composed of 8% pyrite stringers within a moderately silicified and sericitized felsic porphyritic dike with weak fuchsite alteration.

OSK-W-17-943 new assay results extend the previously reported result of 4.51 g/t Au over 2.0 metres (March 2, 2018) to 3.25 g/t Au over 5.2 metres in Wolf HW. Mineralization is composed of 5% pyrite stringers, 2% disseminate pyrite within a sericitized and strongly silicified felsic porphyritic dike.

OSK-W-17-967 intersected two intervals in Caribou Extension: 23.2 g/t Au over 2.0 metres and 10.2 g/t Au over 4.5 metres. The first interval is composed of 2% pyrite stringers and disseminated pyrite within a strong sericite, weak silica altered rhyolite. The second interval is composed of 2% pyrite stringers, disseminated pyrite and quartz-tourmaline veins within a sericitized felsic porphyritic dike.

OSK-W-17-1139 intersected 4.44 g/t Au over 2.2 metres in FW3. Mineralization is composed of up to 2% pyrite stringers hosted in a sericitized felsic porphyritic dike.

OSK-W-17-1308-W1 intersected 7.27g/t Au over 2.0 metres in Wolf. Mineralization is composed of trace pyrite stringers and disseminated in moderately chloritized and sericitized felsic porphyritic dike.

OSK-W-17-1336-W1 intersected 6.12 g/t Au over 7.5 metres in FW3. Mineralization is composed of up to 5% pyrite clusters, 1% pyrite stringers and a 20 centimetres zone with 15% ptygmatic tourmaline veins hosted in a sericitized and silicified felsic porphyritic dike.

OSK-W-17-1352 intersected 9.39 g/t Au over 2.0 metres in Caribou Extension. Mineralization is composed of up to 8% tourmaline-pyrite stringers at the contact between a gabbro and a felsic intrusive unit with weak fuchsite alteration.

OSK-W-17-1368 intersected 3.77 g/t Au over 2.0 metres and 8.05 g/t Au over 2.1 metres in Caribou Extension. The first interval is composed of trace pyrite in stringers and disseminated within a weak sericite and silica altered felsic porphyritic dike. The second interval is composed of 2% pyrite stringers, 5% pyrite-tourmaline stringers, 3% ptygmatic tourmaline veins within a sericitized and silicified rhyolite.

OSK-W-17-1369 intersected 5.67 g/t Au over 6.3 metres in Caribou. Mineralization is composed of up to 7% pyrite stringers and 10% disseminated pyrite in an alternation of mafic and felsic volcanic units.

OSK-W-17-1371 intersected 3.19 g/t Au over 2.0 metres in Caribou Extension. Mineralization is composed of disseminated pyrite and pyrite in quartz-tourmaline veins within a sericitized rhyolite.

OSK-W-17-1378 intersected 4.03 g/t Au over 2.0 metres in Zone 27 and 9.26 g/t Au over 2.3 metres in a vein. The first interval is composed of 5% pyrite within a felsic porphyritic dike. The second interval is composed of quartz-carbonate vein with local visible gold hosted in the Red Dog intrusion.

OSK-W-17-1402 intersected 5.38 g/t Au over 5.0 metres, 4.09 g/t Au over 2.0 metres and 4.99 g/t Au over 2.0 metres in FW3. All three mineralized intervals are composed of up to 1% pyrite-silica flooding and trace pyrite stringers within a sericitized felsic porphyritic dike.

OSK-W-18-762-W1 intersected 11.1 g /t Au over 2.0 metres in FW4. Mineralization is composed of 2% pyrite stringers, 1% pyrite-tourmaline stringers and 30 centimetres of strong pyrite silica flooding within a sericitized and silicified felsic porphyritic dike.

OSK-W-18-823-W2 intersected two intervals in FW1: 11.7 g/t Au over 2.3 metre and 40.8 g/t Au over 4.1 metres. The first interval is composed of a pyrite-tourmaline stringer with 20% pyrite and local visible gold. Mineralization is in strong pervasive silica flooding and calcite alteration within a sericitized felsic porphyritic dike. The second interval is composed of up 2% pyrite stringers, trace pyrite-tourmaline stringer, disseminated pyrite, chalcopyrite and local visible gold within a moderate sericite altered, fragmental, felsic porphyritic dike.

OSK-W-18-1402-W1 intersected four intervals: 3.52 g/t Au over 2.0 metres and 53.9 g/t Au over 2.9 metres in FW1, 6.63 g/t Au over 2.6 metres in FW3 and 4.47 g/t Au over 2.4 metres in FW4. In the first and second intervals, mineralization is composed of local visible gold, up to 15% pyrite and tourmaline ptygmatic veins within a strongly sericitized and silicified felsic porphyritic dike. The third interval is composed local visible gold, 2% pyrite stringers, 1% pyrite stockwork and 2% pyrite-silica flooding. FW3 mineralisation is hosted in sericitized and silicified felsic porphyritic dike. The last interval is composed of 5% disseminated pyrite and 3% pyrite in smoky quartz veins within a porphyritic felsic dike with weak sericite alteration and moderate silica alteration.

OSK-W-18-1421 intersected 36.1 g/t Au over 3.2 metres in FW4. Mineralization is composed of local visible gold and up to 20% pyrite stringers with pervasive silica flooding in a felsic fragmental intrusion. The interval extends FW4 70 metres up plunge of OSK-W-16-735 (33.6 g/t Au over 4.2 metres, previously reported November 8, 2016).

OSK-W-18-1431 intersected two intervals: 3.57 g/t Au over 2.0 metres in FW2 and 13.5 g/t Au over 2.8 metres FW3. The first interval is composed of up to 8% semi-massive pyrite and 1% pyrite clusters within in a moderately silicified felsic porphyritic dike. The second interval is composed of up to 30% semi-massive pyrite within a sericite and silica altered felsic porphyritic dike.

OSK-W-18-1435 intersected 32.8 g/t Au over 2.3 metres in Bobcat. Mineralization is composed of 15% disseminated pyrite, ptygmatic tourmaline veins and pervasive silica flooding within a silicified and sericitized felsic porphyritic dike.

OSK-W-17-1441 intersected 3.41 g/t Au over 2.8 metres in Bobcat. Mineralization is composed of up to 10% semi-massive pyrite, 3% pyrite-tourmaline stingers within a strongly sericitized rhyolite.

Qualified Person

Quality Control and Reporting Protocols

About the Windfall Lake Gold Deposit

About Osisko Mining Inc.

Cautionary Note Regarding Forward-Looking Information

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

OSISKO INTERSECTS 403 g/t Au OVER 2.7 METRES AT LYNX

Posted on April 5, 2018November 8, 2023 by Yannick Fradette

(Toronto, April 5, 2018) 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 16 intercepts in 5 drill holes and 5 wedges focused on infill and expansion drilling in the Lynx deposit are presented below. Osisko continues to extend the known Lynx zones of mineralization through the application of the Windfall geological model and as the density of drilling increases.

Highlights from the new results include: 403 g/t Au over 2.7 metres in OSK-W-18-1412-W1; 151 g/t Au over 2.2 metres in OSK-W-18-1414-W2, 40.1 g/t Au over 2.0 metres in OSK-W-17-1363, and 36.3 g/t Au over 2.0 metres in OSK-W-18-1436. 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-W-17-1166-W3	661.0	664.8	3.8	6.38		Lynx	Lynx
including	663.5	664.8	1.3	14.3		Lynx	Lynx
	1341.0	1343.0	2.0	4.06		Lynx 6	Lynx
	1385.0	1387.0	2.0	6.26		Lynx 6	Lynx
including	1386.0	1386.3	0.3	41.3		Lynx 6	Lynx
OSK-W-17-1193	1659.8	1662.0	2.2	5.66		Vein	Lynx
including	1659.8	1660.6	0.8	15.5		Vein	Lynx
	1682.0	1684.0	2.0	11.0		Vein	Lynx
including	1682.5	1683.1	0.6	33.6		Vein	Lynx
OSK-W-17-1343-W1	560.8	563.9	3.1	3.32		Lynx HW	Lynx
OSK-W-17-1363	222.0	224.0	2.0	3.28		Lynx HW	Lynx
	470.5	472.5	2.0	40.1		VNCR	Lynx
including	470.5	471.5	1.0	79.9		VNCR	Lynx
OSK-W-17-1379	136.4	138.5	2.1	5.62		Lynx 1	Lynx
including	136.4	137.0	0.6	18.9		Lynx 1	Lynx
OSK-W-17-1413	534.6	537.0	2.4	5.77		Lynx 4	Lynx
	742.0	744.0	2.0	3.83		Lynx 4	Lynx
OSK-W-18-923-W1	876.2	878.2	2.0	3.39		Lynx 4	Lynx
OSK-W-18-1412-W1	720.0	722.7	2.7	403	50.9	Lynx 1	Lynx
including	721.7	722.7	1.0	1050	100	Lynx 1	Lynx
	731.0	733.0	2.0	10.4		Lynx 1	Lynx
including	731.9	733.0	1.1	17.9		Lynx 1	Lynx
OSK-W-18-1414-W2	934.5	936.7	2.2	151	83.5	Lynx 4	Lynx
including	934.5	935.0	0.5	369	100
including	935.8	936.7	0.9	117	100
OSK-W-18-1436	546.0	548.0	2.0	36.3		Lynx 2	Lynx
including	547.0	547.6	0.6	91.0		Lynx 2	Lynx

Notes: True widths are estimated at 65 – 80% of the reported core length interval. See “Quality Control” below.
Definitions: HW = Hanging Wall; VNCR = Crustiform Vein.

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Section
OSK-W-17-1166-W3	132	-59	1551	453621	5435639	4050
OSK-W-17-1193	141	-59	1803	453806	5435726	4275
OSK-W-17-1343-W1	137	-56	870	453570	5435490	3950
OSK-W-17-1363	341	-72	513	453458	5435025	3625
OSK-W-17-1379	332	-66	540	452781	5434772	2900
OSK-W-17-1413	137	-53	996	453153	5435214	3450
OSK-W-18-923-W1	137	-56	962	453607	5435603	4025
OSK-W-18-1412-W1	133	-51	825	453684	5435676	4125
OSK-W-18-1414-W2	133	-58	1095	453654	5435648	4100
OSK-W-18-1436	139	-52	1128	453372	5435509	3775

President and CEO John Burzynski commented: “We continue to see good results from our drilling at Lynx and are looking forward to our initial mineral resource estimate which is on schedule for delivery in May. The Lynx Corridor was discovered by the Osisko team just a year ago and has been traced out over a length of almost two kilometres and remains open along strike. As we closed the database for the mineral resource calculation in mid-March, today’s results will not be included but will add to the upside potential of the Lynx deposit as we head towards the feasibility study in early 2019.”

OSK-W-17-1166-W3 intersected three intervals: 6.38 g/t Au over 3.8 metres in Lynx Corridor, 4.06 g/t Au over 2.0 metres and 6.26 g/t Au over 2.0 metres in Lynx 6. The first interval is composed of 2% pyrite clusters and 1% pyrite stringers in a strongly sericitized felsic fragmental intrusion. The second interval is composed of 3% pyrite clusters and one pyrite stringers within a strongly sericitized rhyolite. The last interval is composed of pyrite stringers and pyrite-silica flooding within a weak sericite altered felsic porphyritic dike.

OSK-W-17-1193 intersected two intervals in a shear zone, 200 metres south of Lynx 6 returned 5.66 g/t Au over 2.2 metres and 11.0 g/t Au over 2.0 metres. In the first interval, mineralization is composed of 3% disseminated pyrrhotite and the second interval is composed of 2% pyrite clusters and pyrrhotite traces. Small quartz veins are with the mineralization and hosted in a sheared, strongly sericitized andesite.

OSK-W-17-1343-W1 intersected 3.32 g/t Au over 3.1 metres in Lynx HW. Mineralization is composed of trace pyrite within moderate sericite altered gabbro.

OSK-W-17-1363 intersected two intervals: 3.28 g/t Au over 2.0 metres in the Lynx HW and 40.1 g/t Au over 2.0 metres in a crustiform vein. In the first interval, mineralization is composed of disseminated pyrite and pyrite stringers within a chloritized rhyolite. The second interval is composed of 7% pyrite stringers and pyrite-silica flooding within a strong chlorite, strong fuchsite and weak silica altered gabbro. The interval is 85 metres down plunge of OSK-W-17-1121 (8.62 g/t over 2.7 metres previously reported Octobre 12, 2017).

OSK-W-17-1379 intersected 5.62 g/t Au over 2.1 metres in Lynx 1. Mineralization is composed of up to 5% pyrite stringers within a strong sericite, chlorite and fuchsite altered felsic porphyritic dike.

OSK-W-17-1413 intersected two intervals in Lynx 4: 5.77 g/t Au over 2.4 metres and 3.83 g/t Au over 2.0 metres. In the first interval, mineralization is composed of 1% disseminated pyrite and 1% pyrite-silica flooding within a strongly silicified, large quartz eyes, felsic porphyritic intrusion. The interval is 100 metres south-west of OSK-W-17-827 (3.63 g/t over 3.0 metres previously reported July 12, 2017). The second interval is composed of disseminated pyrite within a strong chlorite and weak fuchsite altered andesite.

OSK-W-18-923-W1 intersected 3.39 g/t Au over 2.0 metres in Lynx 4. Mineralization is composed of 2% pyrite clusters, 1% pyrite stringers and 1% disseminated pyrite in quartz vein fracture filling. Mineralization is at a sericite and fuchsite altered contact between a gabbro and a rhyolite.

OSK-W-18-1412-W1 intersected two intervals: 403 g/t Au over 2.7metres and 10.4 g/t Au over 2.0 metres in Lynx 1. The first interval is composed of up to 5% pyrite as stringers, clusters, and disseminated, 2% disseminated chalcopyrite and local visible gold within a moderate sericite, silica and fuchsite altered gabbro. The second interval is composed of up to 10% disseminated pyrite, up to 10% pyrite-tourmaline veins and 5% disseminated pyrite within a moderate silica, moderate sericite and weak fuchsite altered gabbro.

OSK-W-18-1414-W2 intersected 151 g/t Au over 2.2 metres in Lynx 4. Mineralization is composed of 1% pyrite-tourmaline veins, 1% pyrite clusters, up to 8% disseminated pyrite and local visible gold within a strong silica, sericite and fuchsite altered gabbro.

OSK-W-18-1436 intersected 36.3 g/t Au over 2.0 metres in Lynx 2. Mineralization is composed of up to 2% pyrite stringers and 2% ptygmatic quartz-tourmaline veins within strong silica and sericite altered 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

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.

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 describing the analytical results from 31 intercepts in 22 holes and 3 wedges focused on infill and expansion drilling in the Lynx deposit; the high-grade core developing at Lynx 4; the type of drilling included in the drill program (definition, expansion and exploration drilling in and around the main Windfall Lake gold deposit and the 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.

For further information please contact:

John Burzynski. President and Chief Executive Officer
Telephone: (416) 363-8653

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Month: April 2018