OSISKO WINDFALL INFILL DRILLING CONFIRMING SHALLOW MINERALIZED ZONES

Posted on August 8, 2018November 8, 2023 by IrinaShamis

34.8 g/t Au Over 4.3 Metres in Zone 27

(Toronto, August 8, 2018) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new infill drilling results from the ongoing drill definition and expansion 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 commenced in late 2015. The program is now focussed on infill drilling within the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall), and exploration and expansion drilling on main mineralized zones with several deep holes in progress to investigate the down-plunge areas in and around the Underdog and Lynx zones.

Today’s results, presented in the table below, include significant new analytical results from 59 intercepts in 37 drill holes and extensions focused on shallow infill drilling in the Windfall deposit all above 400 metres vertical depth.

Highlights from the new results include: 34.8 g/t Au over 4.3 metres in OSK-W-18-1614; 12.6 g/t Au over 10.7 metres and 27.0 g/t Au over 4.2 metres in OSK-W-18-1547; 37.9 g/t Au over 3.2 metres in OSK-W-18-1586; and 34.6 g/t Au over 2.0 metres in OSK-W-18-1510. 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	Type	Mineralized Area
OSK-OBM-16-662	395.0	400.0	5.0	4.25		infill	Zone 27
OSK-W-18-1466	177.0	179.0	2.0	3.81		infill	Zone 27
including	178.1	178.5	0.4	17.8		infill	Zone 27
OSK-W-18-1481	89.0	91.0	2.0	12.7		infill	Bobcat
including	89.4	90.5	1.1	22.9		infill	Bobcat
OSK-W-18-1487	44.5	50.0	5.5	3.62		infill	Caribou
OSK-W-18-1497	72.2	74.4	2.2	5.45		infill	Caribou
including	72.2	72.8	0.6	14.1		infill	Caribou
	91.3	94.0	2.7	3.84		infill	Caribou
OSK-W-18-1505	46.0	49.0	3.0	9.78		infill	Caribou
	196.0	198.0	2.0	3.07		infill	Zone 27
OSK-W-18-1506	353.0	355.3	2.3	6.66		infill	Zone 27
OSK-W-18-1509	14.8	17.0	2.2	6.23		extension	Bobcat
including	15.5	15.8	0.3	38.7		extension	Bobcat
OSK-W-18-1510	304.7	306.7	2.0	34.6		infill	Zone 27
including	306.0	306.7	0.7	75.1		infill	Zone 27
OSK-W-18-1517	81.7	88.0	6.3	4.24		infill	Caribou
OSK-W-18-1518	71.6	74.0	2.4	5.39		infill	Caribou
OSK-W-18-1534	338.5	340.5	2.0	4.38		infill	Zone 27
including	338.8	339.2	0.4	18.5		infill	Zone 27
OSK-W-18-1538	279.0	281.0	2.0	5.69		infill	Zone 27
including	280.0	280.4	0.4	24.9		infill	Zone 27
	302.1	304.1	2.0	6.60		infill	Zone 27
including	303.0	304.1	1.1	11.4		infill	Zone 27
OSK-W-18-1543	207.0	209.3	2.3	8.15		infill	Zone 27
including	208.5	209.3	0.8	19.0		infill	Zone 27
OSK-W-18-1545	189.6	196.3	6.7	3.31		infill	Caribou
	240.0	242.5	2.5	5.33		infill	Caribou
OSK-W-18-1547	108.6	113.2	4.6	4.86		infill	Caribou
	286.4	288.8	2.4	3.67		infill	Caribou
	294.6	296.8	2.2	3.60		infill	Caribou
	338.0	348.7	10.7	12.6		infill	Zone 27
including	342.0	343.0	1.0	93.7		infill	Zone 27
	371.0	375.2	4.2	27.0		infill	Zone 27
	379.5	382.0	2.5	22.5		infill	Zone 27
OSK-W-18-1552	101.2	103.5	2.3	5.98		infill	Caribou
including	101.6	102.4	0.8	15.1		infill	Caribou
OSK-W-18-1558	156.0	158.0	2.0	11.4		infill	Caribou
	273.8	276.2	2.4	3.30		infill	Caribou
	365.7	372.8	7.1	6.98		infill	Zone 27
OSK-W-18-1559	256.0	258.0	2.0	3.43		infill	Zone 27
OSK-W-18-1563	64.0	66.8	2.8	4.72		infill	Caribou
	158.0	160.0	2.0	4.52		infill	Caribou
	283.0	285.9	2.9	5.20		infill	Zone 27
	302.0	304.0	2.0	4.67		infill	Zone 27
OSK-W-18-1567	172.0	174.0	2.0	3.34		infill	Zone 27
	187.2	191.0	3.8	8.56		infill	Zone 27
including	190.5	191.0	0.5	40.5		infill	Zone 27
OSK-W-18-1572	206.6	208.6	2.0	3.44		infill	Caribou
	532.0	534.0	2.0	6.61		infill	Zone 27
including	532.0	532.6	0.6	21.4		infill	Zone 27
OSK-W-18-1577	88.8	91.2	2.4	8.83		infill	Zone 27
including	89.5	90.2	0.7	30.1		infill	Zone 27
OSK-W-18-1580	15.0	17.0	2.0	6.47		infill	Zone 27
including	15.0	15.7	0.7	18.1		infill	Zone 27
OSK-W-18-1586	52.4	55.6	3.2	37.9		infill	Zone 27
including	53.2	54.0	0.8	83.7		infill	Zone 27
OSK-W-18-1594	166.9	169.3	2.4	3.53		infill	Zone 27
OSK-W-18-1596	245.0	247.1	2.1	5.52		infill	Zone 27
including	245.6	246.1	0.5	13.4		infill	Zone 27
OSK-W-18-1597	127.9	130.0	2.1	9.08		infill	Caribou
including	127.9	129.0	1.1	17.3		infill	Caribou
	205.0	207.5	2.5	5.08		infill	Zone 27
OSK-W-18-1601	33.0	35.0	2.0	4.38		infill	Caribou
OSK-W-18-1602	83.5	85.5	2.0	18.4		infill	Caribou
including	83.5	84.5	1.0	36.4		infill	Caribou
	140.7	143.1	2.4	7.94		infill	Caribou
including	141.8	142.4	0.6	22.4		infill	Caribou
	170.5	172.5	2.0	4.13		infill	Caribou
OSK-W-18-1605	248.0	250.0	2.0	3.05		infill	Zone 27
OSK-W-18-1607	202.0	204.0	2.0	3.89		infill	Zone 27
OSK-W-18-1609	58.5	61.0	2.5	5.54		infill	Caribou
including	58.5	59.7	1.2	11.4		infill	Caribou
	257.8	260.5	2.7	4.69		infill	Zone 27
including	258.8	259.3	0.5	22.2		infill	Zone 27
OSK-W-18-1611	82.0	84.1	2.1	5.19		infill	Caribou
including	83.3	84.1	0.8	12.6		infill	Caribou
	215.9	218.0	2.1	5.41		infill	Zone 27
OSK-W-18-1614	71.0	73.1	2.1	6.47		infill	Zone 27
	81.0	85.3	4.3	34.8	28.2	infill	Zone 27
including	84.0	85.3	1.3	100	78.5	infill	Zone 27
OSK-W-18-1617	151.7	154.3	2.6	3.49		infill	Caribou
including	153.9	154.3	0.4	15.7		infill	Caribou
OSK-W-18-1631	265.0	267.0	2.0	17.1		infill	Zone 27
including	266.0	267.0	1.0	34.0		infill	Zone 27

Note: True widths are estimated at 65 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below.

Hole No.	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Section
OSK-OBM-16-662	330	-53	435	452423	5434665	2550
OSK-W-18-1466	344	-47	300	451979	5434531	2075
OSK-W-18-1481	322	-46	108	452706	5434972	2925
OSK-W-18-1487	332	-46	57	452341	5434658	2475
OSK-W-18-1497	331	-52	363	452350	5434664	2475
OSK-W-18-1505	328	-45	342	452350	5434661	2475
OSK-W-18-1506	329	-53	417	452366	5434643	2475
OSK-W-18-1509	329	-51	228	452907	5434997	3125
OSK-W-18-1510	325	-58	405	452279	5434572	2375
OSK-W-18-1517	330	-49	348	452385	5434672	2500
OSK-W-18-1518	330	-54	393	452266	5434569	2350
OSK-W-18-1534	332	-45	396	452462	5434676	2575
OSK-W-18-1538	330	-55	351	452253	5434616	2375
OSK-W-18-1543	327	-52	294	452251	5434639	2375
OSK-W-18-1545	332	-49	522	452452	5434662	2575
OSK-W-18-1547	330	-62	441	452299	5434640	2425
OSK-W-18-1552	332	-52	366	452308	5434640	2425
OSK-W-18-1558	316	-47	459	452462	5434664	2575
OSK-W-18-1559	331	-53	330	452299	5434661	2425
OSK-W-18-1563	334	-46	330	452297	5434656	2425
OSK-W-18-1567	328	-48	213	452238	5434684	2375
OSK-W-18-1572	333	-50	558	452469	5434627	2550
OSK-W-18-1577	325	-45	153	452235	5434845	2475
OSK-W-18-1580	327	-46	60	452264	5434853	2500
OSK-W-18-1586	146	-52	117	452270	5434955	2550
OSK-W-18-1594	140	-50	270	452212	5434966	2500
OSK-W-18-1596	333	-45	339	452328	5434668	2450
OSK-W-18-1597	325	-47	254	452276	5434661	2400
OSK-W-18-1601	330	-49	273	452266	5434629	2375
OSK-W-18-1602	330	-47	261	452276	5434661	2400
OSK-W-18-1605	329	-45	345	452328	5434668	2450
OSK-W-18-1607	332	-47	261	452244	5434627	2375
OSK-W-18-1609	334	-45	315	452312	5434665	2450
OSK-W-18-1611	328	-46	270	452278	5434651	2400
OSK-W-18-1614	146	-47	279	452157	5434953	2450
OSK-W-18-1617	329	-47	245	452273	5434674	2425
OSK-W-18-1631	330	-45	315	452356	5434670	2475

OSK-OBM-16-662 intersected 4.25 g/t Au over 5.0 metres in Zone 27. Mineralization consists of up to 1% disseminated pyrite within a strong sericite altered andesite in contact with a felsic dike.

OSK-W-18-1466 intersected 3.81 g/t Au over 2.0 metres in Zone 27. Mineralization consists of 2% disseminated pyrite and stringers within a strong sericite and chlorite altered andesite in contact with a felsic porphyritic dike.

OSK-W-18-1481 intersected 12.7 g/t Au over 2.0 metres in Bobcat. Mineralization consists of up to 3% pyrite stringers and quartz-tourmaline veins within a strong silica and moderate sericite altered felsic porphyritic dike.

OSK-W-18-1487 intersected 3.62 g/t Au over 5.5 metres in Caribou. Mineralization consists of 2% pyrite stringers and trace sphalerite within a strong sericite and silica altered felsic porphyritic dike.

OSK-W-18-1497 intersected 5.45 g/t Au over 2.2 metres and 3.84 g/t Au over 2.7 metres in Caribou. Both intervals contain up to 10% pyrite stringers at the contact between a strong silica altered rhyolite and a felsic porphyritic intrusion.

OSK-W-18-1505 intersected 9.78 g/t Au over 3.0 metres in Caribou and 3.07 g/t Au over 2.0 metres in Zone 27. The first interval contains 10% pyrite stringers within a strong sericite altered felsic porphyritic dike. The last interval contains up to 5% pyrite stringers within a strong sericite altered rhyolite.

OSK-W-18-1506 intersected 6.66 g/t Au over 2.3 metres in Zone 27. Mineralization consists of up to 10% disseminated pyrite and 3% pyrite-tourmaline veins within a strong sericite and weak silica altered felsic porphyritic intrusion.

OSK-W-18-1509 intersected 6.23 g/t Au over 2.2 metres in Bobcat. Mineralization consists of 3% disseminated pyrite included in silica flooding hosted in a moderate silica and weak sericite altered felsic fragmental dike. The interval extends the Bobcat zone 25 metres north-east from OSK-W-17-1251 (8.89 g/t Au over 3.0 metres, reported January 25, 2018).

OSK-W-18-1510 intersected 34.6 g/t Au over 2.0 metres in Zone 27. Mineralization consists of up to 10% pyrite stringers, locally semi-massive, hosted in a weak sericite and fuchsite altered andesite.

OSK-W-18-1517 intersected 4.24 g/t Au over 6.3 metres in Caribou. Mineralization consists of 10% pyrite clusters at a faulted contact between a moderate sericite altered gabbro and a rhyolite.

OSK-W-18-1518 intersected a vein returning 5.39 g/t Au over 2.4 metres. Mineralization consists of disseminated pyrite within the monzonitic “Red Dog” dike.

OSK-W-18-1534 intersected 4.38 g/t Au over 2.0 metres in Zone 27. Mineralization consists of up to 7% quartz-tourmaline stringers, 1% pyrite clusters and ptygmatic tourmaline veins within a strong sericite altered felsic porphyritic dike.

OSK-W-18-1538 intersected 5.69 g/t Au over 2.0 metres and 6.60 g/t Au over 2.0 metres in Zone 27. The first interval contains 2% disseminated and stringer pyrite within a moderate sericite altered felsic porphyritic intrusion. The second interval contains up to 3% pyrite stringers and 1% disseminated pyrite and quartz-tourmaline veins at the contact between a strong silica and sericite altered felsic porphyritic dike and a chlorite altered andesite.

OSK-W-18-1543 intersected 8.15 g/t Au over 2.3 metres in Zone 27. Mineralization consists of local visible gold, up to 7% pyrite with quartz-tourmaline veins and trace chalcopyrite hosted at a strong sericite altered contact between a felsic porphyritic intrusion and a rhyolite.

OSK-W-18-1545 intersected 3.31 g/t Au over 6.7 metres and 5.33 g/t Au over 2.5 metres in Caribou. Both intervals contain up to 10% pyrite, disseminated or in clusters, and trace pyrite-tourmaline stringers hosted in a moderate sericite altered rhyolite.

OSK-W-18-1547 intersected six intervals: 4.86 g/t Au over 4.6 metres, 3.67 g/t Au over 2.4 metres and 3.60 g/t Au over 2.2 metres in Caribou and, 12.6 g/t Au over 10.7 metres, 27.0 g/t Au over 4.2 metres and 22.5 g/t Au over 2.5 metres in Zone 27. The first interval contains 15% pyrite stockwork within a moderate sericite altered rhyolite. The second and third intervals contain up to 7% pyrite stringers, locally semi-massive, and trace tourmaline stringers within a strong sericite altered felsic porphyritic dike. The three Zone 27 intervals contain up to 15% pyrite stringers, locally semi-massive, pyrite-silica flooding, local visible gold, trace sphalerite and chalcopyrite hosted in strong silica altered felsic dike.

OSK-W-18-1552 intersected 5.98 g/t Au over 2.3 metres in Caribou. Mineralization consists of up to 7% pyrite stringers at the contact between moderate sericite altered rhyolite and a felsic porphyritic dike.

OSK-W-18-1558 intersected three intervals: 11.4 g/t Au over 2.0 metres and 3.30 g/t Au over 2.4 metres in Caribou and 6.98 g/t Au over 7.1 metres in Zone 27. The first interval contains trace pyrite, disseminated and clustered, within a moderate sericite altered felsic dike. The second interval contains up to 15% stringer and disseminated pyrite within a strong silica altered and moderate sericite altered rhyolite. The last interval contains up to 10% pyrite stringers, 1% disseminated pyrite within a moderate silica and sericite altered felsic porphyritic dike.

OSK-W-18-1559 intersected 3.43 g/t Au over 2.0 metres in Zone 27. Mineralization consists of 1% pyrite stringers within a moderate sericite altered contact between an andesite and a felsic intrusion.

OSK-W-18-1563 intersected four intervals: 4.72 g/t Au over 2.8 metres and 4.52 g/t Au over 2.0 metres in Caribou and, 5.20 g/t Au over 2.9 metres and 4.67 g/t Au over 2.0 metres in Zone 27. The first interval contains 30% semi-massive pyrite hosted in a moderate sericite altered rhyolite. The second interval contains trace disseminated pyrite within a moderate chlorite altered rhyolite. The third interval contains 2% disseminated pyrite and 1% pyrite stringers within a moderate silica and carbonate altered felsic porphyritic intrusion. The last interval contains 1% pyrite, disseminated and stringers, within a moderate chlorite altered andesite.

OSK-W-18-1567 intersected 3.34 g/t Au over 2.0 metres and 8.56 g/t Au over 3.8 metres in Zone 27. The first interval contains trace disseminated pyrite and ptygmatic tourmaline veins hosted in a moderate sericite altered rhyolite. The second interval contains 5% pyrite-tourmaline veins and 1% pyrite stringers hosted in quartz-carbonate and moderate sericite altered felsic porphyritic intrusion.

OSK-W-18-1572 intersected 3.44 g/t Au over 2.0 metres in Caribou and 6.61 g/t Au over 2.0 metres in Zone 27. The first interval contains 2% pyrite-silica flooding and 1% pyrite stringers within a moderate sericite, chlorite and carbonate altered rhyolite. The second interval contains up to 2% pyrite, disseminated and stringers, hosted in a moderate chlorite and carbonate altered felsic dike.

OSK-W-18-1577 intersected 8.83 g/t Au over 2.4 metres in Zone 27. Mineralization consists of 40% semi-massive pyrite at a strong sericite altered contact between a gabbro and felsic porphyritic intrusion.

OSK-W-18-1580 intersected 6.47 g/t Au over 2.0 metres in Zone 27. Mineralization consists of 5% quartz-tourmaline veins and 5% semi-massive pyrite hosted in a weak sericite altered rhyolite.

OSK-W-18-1586 intersected 37.9 g/t Au over 3.2 metres in Zone 27. Mineralization contains 25% pyrite-tourmaline stringers and local visible gold within a strong silica and moderate sericite altered rhyolite.

OSK-W-18-1594 intersected 3.53 g/t Au over 2.4 metres in Zone 27. Mineralization consists of up to 15% pyrite stringers hosted in a moderate sericite altered felsic porphyritic dike.

OSK-W-18-1596 intersected 5.52 g/t Au over 2.1 metres in Zone 27. Mineralization consists of up to 3% pyrite, disseminated and stringers, hosted in moderate sericite altered rhyolite.

OSK-W-18-1597 intersected two intervals: 9.08 g/t Au over 2.1 metres in Caribou and 5.08 g/t Au over 2.5 metres in Zone 27. The first interval contains up to 1% pyrite, disseminated and clusters, hosted in moderate sericite and chlorite altered rhyolite. The second interval contains up to 20% pyrite-tourmaline stringers within a moderate sericite altered rhyolite.

OSK-W-18-1601 intersected 4.38 g/t Au over 2.0 metres in Caribou. Mineralization consists of 2% pyrite stringers, 1% sphalerite clusters and quartz veins hosted in a moderate sericite, moderate chlorite and weak fuchsite altered gabbro.

OSK-W-18-1602 intersected three intervals: 18.4 g/t Au over 2.0 metres, 7.94 g/t Au over 2.4 metres and 4.13 g/t Au over 2.0 metres in Caribou. The first interval contains trace disseminated and stringer pyrite within a moderate sericite altered rhyolite. The second interval contains 10% pyrite stringers, ptygmatic tourmaline veins and trace sphalerite and chalcopyrite hosted in a strong silica and moderate sericite altered felsic porphyritic intrusion.

OSK-W-18-1605 intersected 3.05 g/t Au over 2.0 metres in Zone 27. Mineralization contains up to 8% pyrite stringers and 1% disseminated pyrite at the contact between a sericite felsic porphyritic intrusion and a bleached andesite.

OSK-W-18-1607 intersected 3.89 g/t Au over 2.0 metres in Zone 27. Mineralization consists of 1% pyrite stringers within a moderate chlorite altered rhyolite.

OSK-W-18-1609 intersected two intervals: 5.54 g/t Au over 2.5 metres in Caribou and 4.69 g/t Au over 2.7 metres in Zone 27. The first interval contains up to 15% pyrite stockwork and 1% disseminated pyrite hosted in moderate sericite and weak silica altered rhyolite.

OSK-W-18-1611 intersected two intervals: 5.19 g/t Au over 2.1 metres in Caribou and 5.41 g/t Au over 2.1 metres in Zone 27. The first interval contains 80% massive pyrite and pyrite stockwork hosted in a strong sericite and silica altered felsic porphyritic intrusion. The second interval contains 2% pyrite clusters, 1% pyrite stringers and fine disseminated pyrite hosted in a moderate chlorite altered andesite.

OSK-W-18-1614 intersected two intervals: 6.47 g/t Au 2.1 metres and 34.8 g/t Au over 4.3 metres in Zone 27. The first interval contains pyrite stringers within a strong sericite and fuchsite altered contact between a gabbro and a fragmental andesite. The second interval contains 20% pyrite stringers and 2% disseminated pyrite within a strong sericite altered fragmental andesite.

OSK-W-18-1617 intersected 3.49 g/t Au over 2.6 metres in Caribou. Mineralization consists of 20% pyrite stringers, 10% sphalerite, pyrite-silica flooding and 1% pyrite-tourmaline veins hosted in moderate sericite and silica altered rhyolite.

OSK-W-18-1631 intersected 17.1 g/t Au over 2.0 metres in Zone 27. Mineralization consists of trace pyrite stringers and clusters within a strong sericite altered felsic dike.

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 Osisko’s Windfall Lake gold project, who is a “qualified person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”).

Quality Control and Reporting Protocols

True width determination is currently unknown but is estimated at 65-80% of the reported core length interval for the zone. 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 (i) ALS Laboratories in Val d’Or, Québec, Thunder Bay, Ontario, Sudbury, Ontario or Vancouver, British Colombia, or (ii) 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 Osisko, as disclosed in the Windfall Lake Technical Report (as defined below), comprises 2,382,000 tonnes at 7.85 g/t Au (601,000 ounces) in the indicated mineral resource category and 10,605,000 tonnes at 6.70 g/t Au (2,284,000 ounces) in the inferred mineral resource category. For details regarding the key assumptions, parameters and methods used to estimate the mineral resources presented in respect of the Windfall Lake gold project, please see the technical report entitled “Technical Report and Mineral Resource Estimate for the Windfall Lake Project, Windfall Lake and Urban-Barry Properties” and dated June 12, 2018 (effective date of May 14, 2018), which has been prepared by InnovExplo Inc. from Val-d’Or, Québec (the “Windfall Lake Technical Report”). The Windfall Lake Technical Report is available on Osisko’s website at www.osiskomining.com and on SEDAR under Osisko’s issuer profile at www.sedar.com). The Windfall Lake gold deposit is currently one of the highest grade resource-stage gold projects in Canada. Mineralization occurs in four principal zones: Lynx, Zone 27, Caribou and Underdog. All zones comprise sub-vertical lenses following intrusive porphyry contacts plunging to the northeast. The deposit is well defined from surface to a depth of 900 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 1,200 metres in others, with significant potential to extend mineralization 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 Québec and Ontario.

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 Windfall Lake gold deposit being a world-class gold system; the significance of new results from the ongoing deep-hole drill/exploration program at the Windfall Lake gold project; the significance of assay results presented in this news release; potential depth extensions of the Lynx and Underdog mineralized zones; the potential, if any of the Deep Underdog and Deep Lynx zones; the type and extend of drilling on the Deep Underdog and Deep Lynx zones, including planned wedge holes; the success of Osisko’s deep-hole drill/exploration program at the Windfall Lake gold project, if any; the down-plunge projection of the gold mineralized structures; the current 800,000 metre drill program; the type of drilling included in the drill program; 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 such assumptions and estimates were made, and 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 DEEP DRILLING GOLD DISCOVERY AT WINDFALL

Posted on August 7, 2018November 8, 2023 by Yannick Fradette

650 Metres Down Plunge From Triple 8 Discovery Hole
22.4 g/t Au Over 3.4 Metres

(Toronto, August 7, 2018) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new results from the ongoing deep-hole exploration program at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

In May 2018 Osisko commenced two deep exploration drill holes (“Deep Underdog” and “Deep Lynx”) to investigate the potential for depth extensions of the Lynx and Underdog mineralized zones, as well as to further test the intrusion-related geological model for the Windfall deposit at depths of approximately 2500 metres from surface. Drilling on the Deep Lynx hole is still in progress, and wedge holes for both Deep Lynx and Deep Underdog are planned.

Following the discovery of Triple 8 Zone in the “Deep Underdog” hole (as disclosed in Osisko’s news release dated July 11, 2018), the down-plunge projection of the gold mineralized structure was interpreted to lie in the path of the “Deep Lynx” hole, OSK-W-18-1616-W1, at target depth of approximately 1950 meters downhole. Alteration and mineralization related to the new intersection occurs in the Deep Lynx hole between 1985.1 metres and 1991.5 metres downhole (approximately 1900 metres vertical depth from surface), including two intervals containing visible gold. Maps and sections showing the location of the Deep Lynx drill hole and the new mineralized zone are provided on the Corporation’s website.

The new gold bearing zone appears to be sub-vertical and has an estimated true thickness of 2.5 metres. Mineralization occurs as up to 12% pyrite stringers, pyrrhotite, chalcopyrite and local visible gold associated with minor quartz-carbonate veins. The hosting andesite is bleached, with sericite alteration and is crosscut by metre scale felsic porphyritic dike. Exact geometries and relationship to the Triple 8 discovery is currently unknown. Drilling in the Deep Lynx hole is still in progress. Wedge holes are being planned to further investigate the new mineralized zone.

Osisko President and CEO John Burzynski commented: “We are very pleased with the continuing success of our deep hole exploration program at Windfall. Our geological model is predicting where to find new extensions of our deposit, and our extensive drill program is key in defining what we believe is a World Class gold system. We are currently planning wedge holes for the Triple 8 discovery area and this new potential extension to better understand the geometry of the gold mineralization in this exciting discovery.”

Today’s results include only partial significant analytical results from hole OSK-W-18-1616-W1. 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	Mineralized Area
OSK-W-18-1616-W1	1985.1	1988.5	3.4	22.4	18.9	TBD
including	1987.1	1987.7	0.6	120	100

Hole No.

From

(m)

Interval

(m)

Au (g/t)

uncut

Au (g/t)

cut to

100 g/t

Mineralized Area

OSK-W-18-1616-W1

1985.1

1988.5

3.4

22.4

18.9

TBD

including

1987.1

1987.7

0.6

120

100

Note: True widths are estimated at 65 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below.

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Section
OSK-W-18-1616-W1	40	-85	in progress	454135	5435060	4225E

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 FILES PEA TECHNICAL REPORT FOR WINDFALL PROJECT

Posted on August 1, 2018November 8, 2023 by Yannick Fradette

(Toronto, August 1, 2018) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to announce the filing of an independent preliminary economic assessment technical report on its Windfall project, which has been prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects. The technical report, entitled “Preliminary Economic Assessment of the Windfall Lake Project, Lebel-sur-Quévillon, Québec, Canada” and dated August 1, 2018 (effective date of July 12, 2018), has been prepared for Osisko by BBA Inc., InnovExplo Inc., Golder Associates Ltd., WSP Canada Inc. and SNC-Lavalin Stavibel Inc. (the “Windfall PEA“). The Windfall PEA is available on SEDAR (www.sedar.com) under Osisko’s issuer profile.

Osisko’s news release dated July 17, 2018 (entitled “Osisko Delivers Positive PEA for Windfall project”) summarized certain key results, assumptions and estimates contained in the Windfall PEA. The Corporation is pleased to report that there are no material differences between the key results, assumptions and estimates contained in the Windfall PEA and Osisko’s news release dated July 17, 2018.

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 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 Corporation also holds interests and options in a number of additional properties in northern Québec and Ontario.

Cautionary Statement Regarding Technical information

Readers are cautioned that the Windfall PEA is preliminary in nature and includes inferred mineral resources that are too speculative geologically to have economic considerations applied to them that would enable them to be categorize as mineral reserves. There is no certainty that the results, assumptions or estimates in the Windfall PEA will be realized. Mineral resources are not mineral reserves and do not have demonstrated economic viability.

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

OSISKO INFILL DRILLING CONFIRMING HIGH-GRADE MINERALIZATION AT WINDFALL

Posted on July 25, 2018November 8, 2023 by Yannick Fradette

68.5 g/t Au Over 9.8 Metres in Underdog
494 g/t Au Over 2.8 Metres in Lynx

(Toronto, July 25, 2018) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new infill drilling results from the ongoing drill definition and expansion 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 commenced in late 2015. The program is now focussed on infill drilling within the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall), and exploration and expansion drilling on main mineralized zones and with several deep holes in progress to investigate the down-plunge areas in and around the Underdog and Lynx zones.

Today’s results focus on infill drilling and include significant new analytical results from 70 intercepts from 33 drill holes and 5 wedges in the Lynx deposit and Underdog zone and include one wireframe extension intercept (Hole OSK-W-18-1593), one extension intercept in a zone not currently included in wireframes (OSK-W-18-1555), and one new intercept not related to any known mineralized zone (OSK-W-18-1461).

Osisko President & CEO John Burzynski noted: “Today’s infill numbers on Lynx and Underdog show very positive and encouraging results as we continue to add drill holes and move more of our mineral resource from inferred to indicated. This is the positive trend that we expected as we work towards completing the second half of our major drill program. In context with last week’s Preliminary Economic Assessment (see Osisko news release dated July 17, 2018), we are confident that the work that we are doing today will only improve on the strength of the deposit as we move Windfall towards our anticipated feasibility study in 2019.”

Highlights from the new infill drilling results include 13 intervals with assays of >32 g/t Au (>1 oz/t Au) (uncut) including: 494 g/t Au over 2.8 metres in OSK-W-18-1593; 68.5 g/t Au over 9.8 metres in OSK-W-18-1066-W1; 273 g/t Au over 2.2 metres and 109 g/t Au over 2.0 metres in OSK-W-18-1546; 145 g/t Au over 2.2 metres in OSK-W-18-1504; 46.4 g/t Au over 5.2 metres in OSK-W-18-1613; 39.3 g/t Au over 5.6 metres in OSK-W-18-1557. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Hole	From (m)	To (m)	Interval (m)	Au (g/t)	Au (g/t) cut to 100 g/t	Type	Corridor
OSK-W-17-1039	454.2	456.6	2.4	11.4		infill
including	455.2	455.6	0.4	62.8
OSK-W-18-909-W5	887.0	889.1	2.1	7.94		infill	VNCR
including	887.0	887.8	0.8	20.7			VNCR
OSK-W-18-1066-W1	779.5	789.3	9.8	68.5	41.6	infill	Underdog
including	783.6	784.0	0.4	94.3
and	786.0	788.2	2.2	220	100
	854.8	857.0	2.2	39.6	35.3	infill	Underdog
including	855.4	856.1	0.7	114	100		Underdog
OSK-W-18-1336-W2	920.6	923.0	2.4	4.36		infill	Underdog
including	920.6	921.0	0.4	17.8			Underdog
	1182.0	1184.0	2.0	4.55		infill	Underdog
OSK-W-18-1426	640.0	642,0	2.0	12.1		infill	Lynx
including	640.0	640.6	0.6	40.2			Lynx
	644.6	646.9	2.3	5.64		infill	Lynx
including	644.6	645.0	0.4	24.2			Lynx
OSK-W-18-1461	782.0	784.3	2.3	16.9		new	Lynx
including	783.5	784.3	0.8	38.1			Lynx
OSK-W-18-1464	277.0	279.7	2.7	4.52		infill	Lynx
including	278.9	279.3	0.4	22.9			Lynx
	396.1	399.7	3.6	42.3	15.9	infill	VNCR
including	397.5	398.0	0.5	290	100		VNCR
OSK-W-18-1492	311.6	314.7	3.1	18.9		infill	Lynx
OSK-W-18-1496	422.8	425.0	2.2	10.1		infill	Lynx
including	422.8	423.7	0.9	24.6			Lynx
OSK-W-18-1503	445.8	448.4	2.6	62.1	36.2	infill	Lynx
including	446.8	447.8	1.0	160	93.0		Lynx
OSK-W-18-1504	228.8	231.0	2.2	145	19.4	infill	Lynx
including	228.8	229.1	0.3	1019	100		Lynx
OSK-W-18-1516	43.7	46.8	3.1	13.5	10.7	infill	Lynx
including	43.7	44.0	0.3	128	100		Lynx
	62.5	65.4	2.9	13.4		infill	Lynx
OSK-W-18-1522	304.8	308.0	3.2	17.6		infill	Lynx
including	304.8	305.5	0.7	22.2
and	307.5	308.0	0.5	77.9
OSK-W-18-1529	284.3	287.0	2.7	4.27		infill	Lynx
OSK-W-18-1531	398.0	400.3	2.3	10.2		infill	Lynx
including	398.7	399.5	0.8	26.9			Lynx
	430.3	433.0	2.7	27.9		infill	Lynx
including	430.3	430.9	0.6	53.7
and	432.7	433,0	0.3	89.8
	449.0	453.3	4.3	4.34		infill	Lynx
including	452.6	453.3	0.7	12.7			Lynx
OSK-W-18-1536	360.6	362.7	2.1	3.25		infill	Lynx
OSK-W-18-1536-W1	278.8	281.3	2.5	23.7	21.7	infill	Lynx
including	279.8	280.3	0.5	110	100		Lynx
	288.0	290.0	2.0	34.1	32	infill	Lynx
including	289.4	290.0	0.6	107	100		Lynx
	316.7	318.7	2.0	5.96		infill	Lynx
OSK-W-18-1539	463.7	466.2	2.5	12.4		infill	Lynx
including	465.6	466.2	0.6	46.8			Lynx
OSK-W-18-1540	375.5	377.5	2.0	7.0		infill	VNCR
OSK-W-18-1546	232.6	235.3	2.7	4.13		infill	Lynx
	254.1	256.9	2.8	29.9		infill	Lynx
including	254.1	255.0	0.9	45.3			Lynx
	264.4	266.8	2.4	10.4		infill	Lynx
including	266.3	266.8	0.5	44.7			Lynx
	273.1	275.2	2.1	3.79		infill	Lynx
including	273.7	274.5	0.8	9.8			Lynx
	307.5	312.0	4.5	19.0		infill	Lynx
including	309.5	310.2	0.7	96.8			Lynx
	327.1	329.1	2.0	109	50.5	infill	Lynx
including	327.7	328.7	1.0	218	100		Lynx
	347.7	349.9	2.2	273	41.1	infill	Lynx
including	348.0	348.9	0.9	668	100		Lynx
	352.6	355.2	2.6	8.66		infill	Lynx
including	353.3	354.2	0.9	24.9			Lynx
OSK-W-18-1550	510.7	514.3	3.6	36.0	30.2	infill	Lynx
including	510.7	511.9	1.2	104	86.8		Lynx
OSK-W-18-1551	234.4	236.8	2.4	34.0		infill	Lynx
including	236.3	236.8	0.5	98.7			Lynx
OSK-W-18-1555	400.0	402.0	2.0	27.4		extension	VNCR
including	400.6	401.6	1.0	51.0			VNCR
OSK-W-18-1557	279.0	284.6	5.6	39.3	22.3	infill	Lynx
including	283.5	284.6	1.1	187	100		Lynx
OSK-W-18-1560	513.7	516.0	2.3	11.9		infill	Lynx
including	513.7	514.5	0.8	32.8			Lynx
	521.6	524.0	2.4	26.1		infill	Lynx
including	521.6	522.3	0.7	89.1			Lynx
OSK-W-18-1565	220.6	223.2	2.6	16.4		infill	Lynx
including	220.6	221.2	0.6	68.5			Lynx
	285.5	291.7	6.2	6.49		infill	Lynx
including	285.5	286.5	1.0	15.7
and	291.2	291.7	0.5	31.6
	370.0	372.8	2.8	9.63		infill	Lynx
including	370.0	370.8	0.8	32.4			Lynx
OSK-W-18-1569	390.7	393.1	2.4	10.3		infill	Lynx
including	391.3	392.1	0.8	30.5			Lynx
OSK-W-18-1569-W1	428,0	430.4	2.4	20.9	18.8	infill	Lynx
including	429.4	429.8	0.4	113	100		Lynx
OSK-W-18-1570	191.0	193.3	2.3	24.5	20.3	infill	Lynx
including	192.9	193.3	0.4	124	100		Lynx
	305.0	307.0	2.0	10.7		infill	Lynx
including	305.5	306.2	0.7	30.3			Lynx
OSK-W-18-1575	133.0	135.4	2.4	36.1		infill	Lynx
including	133.7	134.5	0.8	64.1
and	135.0	135.4	0.4	62.4
	142.0	144.0	2.0	7.35		infill	Lynx
including	143.0	144.0	1.0	14.7			Lynx
OSK-W-18-1578	259.2	264.3	5.1	5.48		infill	Lynx
including	264.0	264.3	0.3	59.9			Lynx
	279.5	282.1	2.6	3.59		infill	Lynx
	294.4	296.6	2.2	3.39		infill	Lynx
OSK-W-18-1579	115.0	117.0	2.0	4.07		infill	Lynx
	120.2	122.5	2.3	4.09		infill	Lynx
including	122.2	122.5	0.3	20.5			Lynx
OSK-W-18-1587	198.1	200.1	2,0	10,0		infill	Lynx
including	199.1	200.1	1.0	18.8			Lynx
	288.1	290.5	2.4	13.2		infill	Lynx
including	289.1	289.5	0.4	77.7			Lynx
	322.5	328.6	6.1	5.01		infill	VNCR
including	322.5	323.5	1.0	17.3			VNCR
OSK-W-18-1593	194.8	197.1	2.3	3.33		extension	Lynx
including	195.2	195.8	0.6	12.5			Lynx
	228.1	230.9	2.8	494	13.2	infill	Lynx
including	230.6	230.9	0.3	4590	100		Lynx
	354.5	257.0	2.5	6.63		infill	VNCR
	364.9	367.3	2.4	3.19		infill	VNCR
OSK-W-18-1608	510.1	513.4	3.3	17.2		infill	Lynx
including	512.6	513.4	0.8	54.9			Lynx
OSK-W-18-1613	221.4	226.6	5.2	46.4	17.2	infill	Lynx
including	221.4	222.2	0.8	290	100		Lynx
	333.0	335.1	2.1	6.58		infill	Lynx
including	333.5	334.0	0.5	26.9			Lynx
OSK-W-18-1615	479.3	481.4	2.1	18.0		infill	Lynx
including	479.8	480.4	0.6	60.5			Lynx
	494.5	496.6	2.1	12.7		infill	Lynx
including	495.1	495.6	0.5	48.6			Lynx
OSK-W-18-1627	406.6	409.0	2.4	9.25		infill	VNCR
	476.0	478.0	2.0	11.8		infill	Lynx
including	476.9	477.5	0.6	38.1			Lynx

Notes: True widths are estimated at 65 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below.

Definitions: VNCR = Crustiform veins.

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Section
OSK-W-17-1039	147	-49	513	453361	5435436	3725
OSK-W-18-909-W5	131	-55	1057	453683	5435677	4150
OSK-W-18-1066-W1	332	-56	1137	452488	5434436	2475
OSK-W-18-1336-W2	335	-61	1193	452616	5434449	2600
OSK-W-18-1426	136	-47	804	453451	5435564	3875
OSK-W-18-1460	143	-51	432	453468	5435347	3775
OSK-W-18-1461	133	-52	849	453307	5435499	3725
OSK-W-18-1464	334	-72	432	453465	5435044	3625
OSK-W-18-1492	333	-58	420	453437	5434906	3550
OSK-W-18-1496	143	-51	456	453316	5435371	3675
OSK-W-18-1503	132	-46	543	453427	5435420	3775
OSK-W-18-1504	330	-48	257	453412	5434904	3525
OSK-W-18-1516	331	-48	102	453223	5435011	3400
OSK-W-18-1522	331	-58	360	453412	5434904	3525
OSK-W-18-1529	334	-69	444	453458	5435016	3600
OSK-W-18-1531	148	-50	498	453381	5435437	3750
OSK-W-18-1536	337	-65	408	453427	5434976	3575
OSK-W-18-1536-W1	337	-65	417	453427	5434976	3575
OSK-W-18-1539	145	-52	536	453372	5435450	3750
OSK-W-18-1540	334	-57	441	453349	5434894	3450
OSK-W-18-1546	331	-55	411	453422	5434924	3550
OSK-W-18-1550	140	-52	606	453373	5435484	3775
OSK-W-18-1551	335	-53	291	453422	5434925	3550
OSK-W-18-1555	331	-60	423	453316	5434901	3425
OSK-W-18-1557	335	-52	374	453422	5434925	3550
OSK-W-18-1560	145	-53	564	453373	5435484	3775
OSK-W-18-1565	330	-57	426	453386	5434920	3500
OSK-W-18-1569	142	-46	522	453324	5435399	3675
OSK-W-18-1569-W1	142	-46	525	453324	5435399	3675
OSK-W-18-1570	331	-55	402	453365	5434933	3500
OSK-W-18-1575	330	-59	216	453357	5435008	3525
OSK-W-18-1578	331	-60	351	453450	5435010	3600
OSK-W-18-1579	331	-57	171	453312	5435017	3475
OSK-W-18-1587	332	-62	360	453450	5435010	3600
OSK-W-18-1593	329	-68	381	453490	5435062	3675
OSK-W-18-1608	146	-51	558	453328	5435467	3725
OSK-W-18-1613	141	-52	381	453199	5435178	3475
OSK-W-18-1615	149	-48	546	453328	5435467	3725
OSK-W-18-1627	141	-51	513	453228	5435374	3600

OSK-W-17-1039 intersected 11.4 g/t Au over 2.4 metres in Lynx. Mineralization consists of 5% pyrite and a quartz-tourmaline crustiform vein with local visible gold hosted in a moderately sericitized rhyolite.

OSK-W-18-909-W5 intersected 7.94 g/t Au over 2.1 metres in Lynx. Mineralization consists of trace disseminated pyrite with a crustiform vein hosted in a chlorite, silica, carbonate and fuchsite altered and foliated gabbro.

OSK-W-18-1066-W1 intersected 68.5 g/t Au over 9.8 metres and 39.6 g/t Au over 2.2 metres in Underdog. The first interval contains local visible gold, up to 15% pyrite and 1% chalcopyrite in pervasive silica flooding patches in a strongly silicified and sericitized porphyric felsic dike with local fuchsite. The second interval contains local visible gold, 2% pyrite in ptygmatic veins, trace chalcopyrite stringers and cluster with pervasive silica flooding, and trace disseminated pyrite in a sericitized and strongly silicified porphyritic dike.

OSK-W-18-1336-W2 intersected 4.36 g/t Au over 2.4 metres and 4.55 g/t Au over 2.0 metres in Underdog. The first interval contains 5% pyrite-tourmaline stringers, 3% pyrite clusters and 2% coarse grained pyrite in volcanic fragments in a sericitized fragmental felsic dike. The second interval contains trace disseminated pyrite and cluster in a sericite, chlorite, and carbonate altered porphyritic felsic dike.

OSK-W-18-1426 intersected 12.1 g/t Au over 2.0 metres and 5.64 g/t Au over 2.3 metres in Lynx. Mineralization is composed of up to 15% interstitial and disseminated pyrite with moderate silica flooding at the contact between a locally sericitized and fuchsitized gabbro and a porphyritic felsic intrusion.

OSK-W-18-1461 intersected 16.9 g/t Au over 2.3 metres in Lynx. Mineralization consists of local visible gold and up to 15% pyrite in silica flooding, hosted in a silicified and sericitized rhyolite at contact with a gabbro. This intersect is located 50 metres northwest of hole OSK-W-17-958 which returned 5.74 g/t Au over 5.0 metres (previously reported October 3^rd, 2017) and is outside the current Lynx resource wireframes.

OSK-W-18-1464 intersected 4.52 g/t Au over 2.7 metres and 42.3 g/t Au over 3.6 metres in Lynx. The first interval is composed of 3% disseminated pyrite, 3% pyrite stringers and local visible gold in a stockwork of smoky quartz veinlets in a sericitized fragmental felsic dike at the contact with a gabbro. The second interval contains local visible gold and up to 10% disseminated pyrite in a crustiform quartz-ankerite ± tourmaline veinlet in a strongly carbonate and chlorite altered gabbro.

OSK-W-18-1492 intersected 18.9 g/t Au over 3.1 metres in Lynx. Mineralization consists of local visible gold, 2% disseminated pyrite and trace sphalerite in silica flooding and trace pyrite stringers in quartz or carbonate-quartz veins hosted in a moderately sericitized and silicified felsic porphyritic intrusion.

OSK-W-18-1496 intersected 10.1 g/t Au over 2.2 metres in Lynx. Mineralization consists of 4% pyrite as stringers or in patches with quartz-carbonates veins hosted in a moderately sericitized, weak silica and fuchsite altered gabbro.

OSK-W-18-1503 intersected 62.1 g/t Au over 2.6 metres in Lynx. Mineralization consists of local visible gold and 2% disseminated pyrite with pervasive silica flooding in a foliated rhyolite with moderate silica and sericite alteration.

OSK-W-18-1504 intersected 145 g/t Au over 2.2 metres in Lynx. Mineralization consists of local visible gold in fracture filling in pervasive silica flooding hosted in a silicified, sericitized and slightly fuchsitized gabbro.

OSK-W-18-1516 intersected 13.5 g/t Au over 3.1 metres and 13.4 g/t Au over 2.9 metres in Lynx. The first interval contains local visible gold and up to 7% disseminated pyrite in a smoky quartz-carbonate vein hosted at a silicified contact between a rhyolite and a gabbro. The second interval contains up to 9% pyrite stringers and disseminated and local visible gold in pervasive silica flooding. Both intervals are hosted in a strongly silicified fragmental felsic intrusion with intrusive, volcanic, tourmaline and pyrite fragments.

OSK-W-18-1522 intersected 17.6 g/t Au over 3.2 metres in Lynx. Mineralization consists of trace visible gold with up 5% pyrite tourmaline stringers, trace pyrite-sphalerite stringer with pervasive silica flooding in a silicified and sericitized rhyolite.

OSK-W-18-1529 intersected 4.27 g/t Au over 2.7 metres in Lynx. Mineralization consists of 3% pyrite stringers and 2% pyrite in quartz-tourmaline veins hosted in a moderate chlorite, sericite, carbonate altered fragmental felsic dike.

OSK-W-18-1531 intersected 10.2 g/t Au over 2.3 metres, 27.9 g/t Au over 2.7 metres and 4.34 g/t Au over 4.3 metres in Lynx. Mineralization in the first two intervals consists of local visible gold and up to 20% pyrite in pervasive silica flooding hosted in a sericitized and silicified fragmental felsic dike. The last interval contains up to 10% pyrite in crustiform veins in pervasive silica flooding and a quartz-tourmaline vein hosted in a silicified and sericitized gabbro.

OSK-W-18-1536 intersected 3.25 g/t Au over 2.1 metres in Lynx. Mineralization consists of up to 10% disseminated pyrite with quartz veins in a sericite, silica, chlorite altered and bleached gabbro with local fuschite.

OSK-W-18-1536-W1 intersected 23.7 g/t Au over 2.5 metres, 34.1 g/t Au over 2.0 metres in Lynx and 5.86 g/t Au over 2.0 metres in a vein. The first and second intervals contain up to 10% disseminated pyrite and local visible gold in a strongly silicified porphyritic felsic intrusive or rhyolite. The vein contains 1% pyrite clusters, trace pyrite-tourmaline stringers and 20% quartz veining in a strongly chloritized, moderately sericitized and bleached gabbro.

OSK-W-18-1539 intersected 12.4 g/t Au over 2.5 metres in Lynx. Mineralization consists of local visible gold, up to 3% pyrite-tourmaline stringers and 4% disseminated or clustered pyrite at the silicified, sericitized and bleached contact between a porphyritic felsic dike and a rhyolite.

OSK-W-18-1540 intersected 7.07 g/t Au over 2.0 metres in Lynx. Mineralization consists of trace pyrite in a crustiform quartz-carbonate vein in a strongly silicified and sericitized porphyritic felsic dike.

OSK-W-18-1546 intersected multiple zones of mineralization in the Lynx Corridor: 4.13 g/t Au over 2.7 metres, 29.9 g/t Au over 2.8 metres, 10.4 g/t Au over 2.4 metres, 3.79 g/t Au over 2.1 metres, 19.0 g/t Au over 4.5 metres, 109 g/t Au over 2.0 metres, 273 g/t Au over 2.2 metres and 8.66 g/t Au over 2.6 metres. The first interval contains 2% disseminated pyrite in a silicified rhyolite at contact with a sheared and faulted gabbro. The second interval contains local visible gold and up to 10% disseminated pyrite at the contact between a silicified porphyritic dike and a rhyolite. The third and fourth intervals contain 3% disseminated pyrite in a strongly sericitized rhyolite. The fifth interval contains local visible gold, 3% disseminated pyrite and 2% pyrite-tourmaline stringers at a silicified contact between a rhyolite and a gabbro. The sixth interval contains 7% disseminated and stringer pyrite in a silicified gabbro with a crustiform vein. The seventh interval contains local visible gold, up to 5% disseminated pyrite and 3% pyrite stringers with crustiform veins hosted in a silicified gabbro. The eighth interval contains local visible gold and 2% disseminated pyrite in a chlorite, fuchsite and bleached altered gabbro with pervasive silica flooding.

OSK-W-18-1550 intersected 36.0 g/t Au over 3.6 metres in Lynx. The interval contains local visible gold, 10% pyrite and trace sphalerite in pervasive silica flooding and ptygmatic tourmaline veins within a sericite and fuchsite altered rhyolite.

OSK-W-18-1551 intersected 34.0 g/t Au over 2.4 metres in Lynx. Mineralization contains up to 1% pyrite stringers with quartz clusters in a silicified rhyolite.

OSK-W-18-1555 intersected 27.4 g/t Au over 2.0 metres in Lynx. Mineralization contains up to 15% disseminated and stringer pyrite in a crustiform quartz-carbonate vein hosted in a silicified and fuchsite altered gabbro. This hole extends a crustiform vein corridor 25 metres toward south-west from OSK-W-17-803, which returned 6.38 g/t Au over 2.3 metres (previously reported May, 24^th, 2017).

OSK-W-18-1557 intersected 39.3 g/t Au over 5.6 metres in Lynx. Mineralization is composed of up to 8% fine pyrite stringers and clusters and quartz-tourmaline veins at the silicified contact between a rhyolite and a fragmental felsic dike.

OSK-W-18-1560 intersected 11.9 g/t Au over 2.3 metres and 26.1 g/t Au over 2.4 metres. Mineralization is composed of local visible gold, up to 3% pyrite stringers, and 2% pyrite-tourmaline veinlets with strong pervasive silica alteration hosted in moderate bleached gabbro.

OSK-W-18-1565 intersected 16.4 g/t Au over 2.6 metres, 6.49 g/t Au over 6.2 metres and 9.63 g/t Au over 2.8 metres in Lynx. The first interval contains local visible gold and 3% disseminated pyrite at the strongly silicified contact between rhyolite and felsic dike. The second interval contains local visible gold and 3% disseminated pyrite in a strongly silicified rhyolite. The third interval contains up 5% disseminated pyrite with quartz-carbonate veins in a silicified gabbro.

OSK-W-18-1569 intersected 10.3 g/t Au over 2.4 metres in Lynx. Mineralization is composed of up to 5% pyrite stringers with pervasive silica flooding and moderate fuchsite alteration in a fragmental felsic unit.

OSK-W-18-1569-W1 intersected 20.9 g/t Au over 2.4 metres in Lynx. Mineralization is composed of local visible gold and 1% pyrite with dismembered quartz-carbonate veins, 2% pyrite stringers, 2% pyrite in pervasive silica flooding and ptygmatic tourmaline veins and 2% pyrite cluster in a sericitized and silicified rhyolite.

OSK-W-18-1570 intersected 24.5 g/t Au over 2.3 metres and 10.7 g/t Au over 2.0 metres in Lynx. The first interval contains local visible gold and 3% pyrite with pervasive silica flooding hosted in a sericitized and silicified porphyritic felsic dike. The second interval contains local visible gold with ptygmatic tourmaline veins and quartz clusters and 5% pyrite with pervasive silica flooding in a strongly silicified rhyolite.

OSK-W-18-1575 intersected 36.1 g/t Au over 2.4 metres and 7.35 g/t Au over 2.0 metres in Lynx. The first interval contains up to 2% disseminated pyrite and 1% chalcopyrite in breccia textured quartz veins hosted in a sericitized rhyolite. The second interval contains 2% pyrite stringers, 1% disseminated pyrite in a chloritized and moderately bleached gabbro.

OSK-W-18-1578 intersected 5.48 g/t Au over 5.1 metres, 3.59 g/t Au over 2.6 metres and 3.39 g/t Au over 2.2 metres in Lynx. Mineralization consists of up to 5% disseminated pyrite with pervasive silica alteration and moderate sericite alteration hosted in a fragmental felsic intrusive unit, porphyritic felsic dike or rhyolite.

OSK-W-18-1579 intersected 4.07 g/t Au over 2.0 metres and 4.09 g/t Au over 2.3 metres in Lynx. Mineralization consists of local visible gold, up to 1% disseminated pyrite in pervasive silica flooding and traces of pyrite fragments within in a sericitized fragmental dike.

OSK-W-18-1587 intersected 10.0 g/t Au over 2.0 metres, 13.2 g/t Au over 2.4 metre and 5.01 g/t Au over 6.0 metres in Lynx. The first interval contains 5% pyrite in pervasive silica flooding and quartz-tourmaline veins in a strongly sericitized and silicified gabbro. The second interval contains local visible gold and 10% disseminated pyrite is strongly silicified rhyolite.

OSK-W-18-1593 intersected multiple intercepts in Lynx: 3.33 g/t Au over 2.3 metres, 494 g/t Au over 2.8 metres, 6.63 g/t Au over 2.5 metres and 3.19 g/t Au over 2.4 metres. The first interval contains 1% pyrite cluster in pervasive chlorite-fuchsite altered gabbro injected by quartz veinlets. The second interval contains a 3 cm wide gold stringer within a silica altered band and pyrite stringers at the contact with a gabbro xenolith and fragmental felsic unit. This high-grade interval extends Lynx resource wireframe 305 approximately 10 meters vertically and is 30 metres vertically above OSK-W-17-1098 (42.8 g/t Au over 2.3 metres, previously reported June, 7^th, 2018). The third and fourth intervals are composed of 5% to locally 20% quartz-tourmaline veins, trace disseminated or stringer pyrite in a strongly silicified and moderately chloritized gabbro.

OSK-W-18-1608 intersected 7.2 g/t Au over 3.3 metres in Lynx. Mineralization consists of up to 3% disseminated pyrite and 10% disseminated pyrite in two quartz-tourmaline-ankerite veins in a gabbro with strong pervasive silica alteration and moderate sericite-fuchsite alteration.

OSK-W-18-1613 intersected 46.4 g/t Au over 5.2 metres and 6.58 g/t Au over 2.1 metres in Lynx. Mineralization consists of up to 7% pyrite and 2% sphalerite with pervasive silica flooding in a strongly silicified fragmental felsic dike with local fuchsite.

OSK-W-18-1615 intersected 18.0 g/t Au over 2.1 metres and 12.7 g/t Au over 2.1 metres in Lynx. The first interval contains local visible gold with 10% disseminated and stringer pyrite with pervasive silica flooding in a sericitized gabbro. The second interval contains 3% disseminated pyrite at the strongly sericitized and moderately silicified contact between a gabbro and porphyritic felsic dike.

OSK-W-18-1627 intersected 9.25 g/t Au over 2.4 metres and 11.8 g/t Au over 2.0 metres in Lynx. Mineralization consists of 3% disseminated or stringer pyrite in association with quartz-carbonate crustiform veins and up 1% ptygmatic tourmaline veinlets in slightly fuchsite-altered gabbro.

Qualified Person

The scientific and technical content of this news release has been reviewed 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 (i) ALS Laboratories in Val d’Or, Québec, Thunder Bay, Ontario, Sudbury, Ontario or Vancouver, British Colombia, or (ii) 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 Osisko, as disclosed in the Windfall Lake Technical Report (as defined below), comprises 2,382,000 tonnes at 7.85 g/t Au (601,000 ounces) in the indicated mineral resource category and 10,605,000 tonnes at 6.70 g/t Au (2,284,000 ounces) in the inferred mineral resource category. For details regarding the key assumptions, parameters and methods used to estimate the mineral resources presented in respect of the Windfall Lake gold project, please see the technical report entitled “Technical Report and Mineral Resource Estimate for the Windfall Lake Project, Windfall Lake and Urban-Barry Properties” and dated June 12, 2018 (effective date of May 14, 2018), which has been prepared by InnovExplo Inc. from Val-d’Or, Québec (the “Windfall Lake Technical Report”). The Windfall Lake Technical Report is available on Osisko’s website at www.osiskomining.com and on SEDAR under Osisko’s issuer profile at www.sedar.com). The Windfall Lake gold deposit is currently one of the highest grade resource-stage gold projects in Canada. Mineralization occurs in four principal zones: Lynx, Zone 27, Caribou, and Underdog. All zones comprise sub-vertical lenses following intrusive porphyry contacts plunging to the northeast. The deposit is well defined from surface to a depth of 900 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 1,200 metres in others, with significant potential to extend mineralization 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 focus of the current 800,000 metre drill program; the significance of the Windfall Lake Technical Report; the significance and assumptions in the preliminary economic assessment prepared in respect of the Windfall and Osborne-Bell deposits as disclosed news release of Osisko dated July 17, 2018; the expectation that the mineral resource grade will be higher than the inferred resource grade; the expectation that the indicated mineral resource grade will be higher than the inferred mineral resource grade; the significance of new results from the ongoing drill program at the Windfall Lake gold project and the adjacent Lynx deposit, including the new infill drill results from the ongoing drill definition and expansion program at Windfall Lake; the significance of assay results presented in this news 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, with several deep holes in progress to investigate the down-plunge areas in and around the Underdog and Lynx zones); 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 DELIVERS POSITIVE PEA FOR WINDFALL PROJECT

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

After-Tax IRR of 33%, NPV C$413M, Capex C$397M
Year 1 Gold Production of 248,000 Ounces

(Toronto, July 17, 2018) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to announce positive results from the independent Preliminary Economic Assessment (“PEA”) prepared in accordance with National Instrument 43-101 at its 100% owned Windfall Deposit located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec, 115 kilometres from the town of Lebel-sur-Quevillon and its 100% owned Osborne-Bell Deposit, located 17 kilometres northwest of the town of Lebel-sur-Quévillon, Québec. The PEA provides a base case assessment of developing both the Windfall and Osborne-Bell deposits as underground ramp-access mines with a central gold processing mill in Lebel-sur-Quévillon, Québec.

John Burzynski, President and CEO commented: “Today’s PEA results are excellent with a robust after-tax Internal Rate of Return (“IRR”) of 33% and after-tax Net Present Value (“NPV”) of C$413 M, based only on our initial mineral resource estimate at Windfall with its conservative grade estimate. This is a very strong start to a project that is growing as inferred resources are being converted to higher-grade indicated resources by the ongoing drill program, with optimized mining methods and with the ongoing exploration success at Windfall. The PEA envisions commencing the project with a 3200 tonne per day (“tpd”) long hole mining approach, focused on extracting large panels with minimum widths of 3.5 metres to 4.0 metres and minimum height of 20 metres. While this study focuses only on the larger zones of mineralization, further detailed modelling using adaptive mining methods will be applied to subsequent studies to capture the bulk of the May 14, 2018 resource, including narrow high-grade zones in the Lynx Zone which were not included in this study. The down plunge extensions of Underdog, Lynx, Zone 27, the recently discovered Bobcat Zone, and the recently announced Triple 8 discovery were not included in this study, as mineral resource definition drilling in these areas is still in progress. These areas are expected to be included in the feasibility work in 2019. Osisko’s PEA outlines the strong potential base-case for significant and profitable new gold production in Quebec, and we anticipate that these great initial numbers will only get better as we progress with our large definition and exploration drilling program at Windfall.”

PEA Highlights*

Base Case Gold price US$1,300/oz, Silver price US$17.00/oz, Exchange rate C$1.00 = US$0.78, 5% discount rate
IRR after taxes and mining duties	32.7%
NPV after taxes and mining duties	C$413.2 million
*Pre-Production Construction costs (including C$51.8 M contingency)*	C$397.3 million
Peak-year payable production	248,000 oz (year 1)
Average LOM payable production	218,000 oz
Net gold payable recovery	92.4%
Average diluted gold grade	6.7 g/t Au
Life of mine (LOM)	8.1 years
Total mineralized material mined	8,914,000 tonnes
Contained gold in mined resource	1,915,000 oz
Payable gold LOM	1,769,000 oz
Payable silver LOM	557,000 oz
All-in Sustaining Costs net of by-product credits and royalties over LOM	US$704.00/oz
Estimated All-in cost (CAPEX plus OPEX)	US$879.00/oz
Total unit operating cost	C$126.47/ tonne milled
Gross revenue	C$2.96 billion
Operating cash flow	C$1.12 billion
Mine start-up/Full production	Q2 2022/Q3 2022
NPV before taxes and mining duties	C$625.4 million
IRR before taxes and mining duties	39.7%

*Cautionary Statement: The reader is advised that the PEA summarized in this press release is intended to provide only an initial, high-level review of the project potential and design options. The PEA mine plan and economic model include numerous assumptions and the use of Inferred resources. Inferred resources are considered to be too speculative to be used in an economic analysis except as allowed for by Canadian Securities Administrators’ National Instrument 43-101 in PEA studies. There is no guarantee that Inferred resources can be converted to Indicated or Measured resources, and as such, there is no guarantee the project economics described herein will be achieved.

The study was prepared by BBA Inc. under the supervision of Mr. Mathieu Savard, P. Geo., Vice President Exploration of Osisko, and Project Manager for Osisko Mining Ms. Kim-Quyên Nguyên, P. Eng., MBA and the Osisko Group technical team and included contributions from the geological and engineering teams at InnvoExplo Inc, Golder Asssociates Ltd, BBA Inc., WSP Canada Inc. and SNC-Lavalin Stavibel Inc.

The realized Project would have a significant impact in the James Bay region, with the potential of generating over C$2.96 billion of gross revenue and contributing approximately 350 permanent, well remunerated jobs during the production phase and an average of 480 construction personnel during construction period.

Table 1: PEA Summary

Total Material Mined (Tonnes)	8,914,000
Average Diluted Gold Grade (g/t Au)	6.7
Total Gold Contained (oz)	1,915,000
Total Gold Produced (oz)	1,770,000
Total Gold Payable (oz)	1,769,000
Gold Payable Recovery(%)	92.4
Average Annual Gold Produced (gold oz per year)	218,000
Total Initial Capital Cost (C$M)	397.3
Sustaining Capital (C$M)	371.1
Site Restoration Cost net of salvage Value (C$M)	40.6
Unit Operating Cost (per tonne milled):
Mining (C$)	63.82
Mineralized Material Transportation (C$)	14.26
Processing (C$)	26.89
Tailing & Water Management (C$)	3.59
General & Administration (C$)	17.93
Total Unit Operating Costs (per tonne milled) (C$)	126.47

Opportunities to Enhance Value

Windfall has a high potential for mineral resource expansion as the Main Zone, Lynx, and Underdog deposits are open down plunge and down-dip, and new zones are still being discovered. Future mine modelling using adaptive mining methods to capture additional mineable resources in narrower mineralized zones, and metallurgical test work is planned to optimize the gold and silver recoveries. Trade-off studies will also be performed to determine the best overall economic processing and dewatering methods. Mining sequence/development scheduling and trade-off studies on mine infrastructures will be further optimized leading to increasingly attractive economics. These opportunities will be captured in a Feasibility study.

Table 2: Summary Economics (US$1,300/oz gold)

After-Tax NPV (C$M)	413.2
After-Tax IRR	32.7%
After-Tax Payback (Years)	3.9
LOM NSR Revenue (C$M)	2,948.2
Total LOM Operating Cash Flow (C$M)	1,119.9
Total LOM Pre-Tax Cash Flow (C$M)	954.2
Average Annual Pre-Tax Cash Flow (C$M)	116.3
LOM Income Taxes (C$M)	340.8
Total LOM After-Tax Free Cash Flow (C$M)	613.4
Average Annual After-Tax Free Cash Flow (C$M)	74.8
Discount Rate (%)	5.0
Pre-Tax NPV (C$M)	625.4
Pre-Tax IRR	39.7%
Pre-Tax Payback (Years)	3.7

Table 3: All-In Sustaining Cost

Mining Cost (C$M)	565.1
Processing Cost (C$M)	238.1
Tailing & Water Management (C$M)	31.8
General & Administrative (C$M)	126.2
Mineralized Material Transportation (C$M)	158.7
Refining & Smelting (C$M)	11.7
Royalties (C$M)	65.1
By-Product Silver Credit ($M)	(12.1)
Adjusted Operating Costs	1,184.6
Sustaining (C$M)	371.1
Closure cost net of salvage value (C$M)	40.6
Total	1,596.2
All-in Sustaining Cost (C$/oz)**	902.5
All-in Sustaining Cost (US$/oz)**	704.0

** All-in Sustaining Costs are presented as defined by the World Gold Council (“WGC”) less Corporate G&A

Table 4: Sensitivities (base case in bold)

Gold Price US$/oz	$1,100	$1,200	$1,250	$1,300	$1,400	$1,500	$1,600
Pre-Tax NPV 5% (C$M)	304.0	464.7	545.0	625.4	786.1	946.8	1,107.6
After-Tax NPV 5% (C$M)	75.8	244.5	328.9	413.2	581.9	750.6	919.3
Pre-Tax IRR	23.4%	31.7%	35.8%	39.7%	47.3%	54.7%	62.0%
After-Tax IRR	11.1%	22.6%	27.8%	32.7%	42.0%	50.9%	59.4%
Pre-Tax Payback (Years)	4.9	4.2	3.9	3.7	3.4	3.2	3.0
After-Tax Payback (Years)	5.9	4.7	4.2	3.9	3.5	3.1	2.9

Table 4: Sensitivities (base case in bold)

FX: US$:C$1.00	0.90	0.85	0.80	0.78	0.70	0.65	0.60
Pre-Tax NPV 5% (C$M)	346.7	453.3	573.2	625.4	864.3	1,043.4	1,252.4
After-Tax NPV 5% (C$M)	120.7	232.5	358.4	413.2	663.9	852.0	1,071.4
Pre-Tax IRR	25.6%	31.2%	37.1%	39.7%	51.0%	59.2%	68.6%
After-Tax IRR	14.4%	21.9%	29.6%	32.7%	46.4%	56.1%	66.9%
Pre-Tax Payback (Years)	4.7	4.2	3.9	3.7	3.3	3.0	2.8
After-Tax Payback (Years)	5.5	4.7	4.1	3.9	3.3	3.0	2.8

PEA Details

The independent PEA was prepared through the collaboration of the following firms: BBA Inc. (Montréal, QC), InnovExplo Inc. (Val D’Or, QC), Golder Associates Ltd (Montréal, QC), WSP Canada Inc. (Val d’Or, QC) and SNC-Lavalin Stavibel Inc. (Val D’Or, QC). These firms provided mineral resource estimates, design parameter and cost estimates for mine operations, process facilities, major equipment selection, waste and tailings storage, reclamation, permitting, and operating and capital expenditures. Table 5 summarizes the contributors and their area of responsibility:

Table 5: Consulting Firm and Area of Responsibility

Consulting Firm	Area of Responsibility
BBA Inc	– Metallurgical test work development and analysis, – Mass balance, – Process plant design; – Process plant capital costs and operating costs; – Electrical and IT infrastructure design and costs (supply and on-site); – Material transport and General and administration operating costs; – Financial Analysis and overall NI 43-101 integration.
InnovExplo Inc	– Historical data review; – Current and historical geology, exploration, drilling; – Sample preparation and QA/QC, and data verification; – Geological modelling and mineral resource estimate; – Underground mine design, underground infrastructure, ventilation, production scheduling, underground capital costs and operating costs.
Golder Associates Ltd	– Waste rock, tailings, and ore a geochemical characterization; – Water treatment plant design, capital and operating costs; – Surface tailings, ore and waste rock management facility designs and costs, excluding reclamation; – Surface water management infrastructure design and costs, excluding reclamation; – Site wide water balance; – Rock mass characterization and rock mechanics input to underground mine design and ground control; – Hydrogeology and groundwater quality input to environmental studies; – Hydrogeology input to underground mine design; – Geotechnical input for the surface infrastructure design
WSP Canada Inc.	– Environmental studies, permitting and closure costs; – Regulatory context, social considerations, and anticipated environmental issues; – Ore handling system from underground mine to mine site surface, design and costs; – Design and costs of surface infrastructure for Windfall Lake and Osborne-Bell sites including on-site roads; – Electrical and IT infrastructure design and costs for Windfall Lake and Osborne Bell sites; – Off-site access road to Osborne-Bell and Windfall Lake sites evaluation and costs.
SNC-Lavalin	– Plant site surface infrastructures design and costs; – Site utilities design and costs; – Access road from Plant pad to tailings pond road design and costs.

Resource Estimate

The PEA is based on an Indicated and Inferred mineral resource estimates completed by independent Qualified Persons Judith St-Laurent (P.Geo., B.Sc.) of InnovExplo Inc for the WindfallDeposit (Table 6) and Pierre-Luc Richard (P.Geo., M.Sc ) of BBA Inc. (InnovExplo at the time of the mineral resource estimate) for the Osborne-Bell Deposit (Table 7). This mineral estimate consists of an Indicated Resource and an Inferred Resource using a base cut-off of 3 g/t Au.

Table 6: Windfall Deposit Mineral Resource Estimate ⁽¹⁾

Zone	Indicated			Inferred
Zone	Tonnes	Grade (g/t)	Au Ounces	Tonnes	Grade (g/t)	Au Ounces
Lynx	1,254,000	7.51	303,000	2,257,000	7.48	543,000
Zone 27	628,000	8.69	175,000	852,000	7.28	199,000
Caribou	318,000	7.12	73,000	2,767,000	5.80	516,000
Underdog	147,000	9.00	43,000	4,380,000	6.77	953,000
Other	34,000	6.58	7,000	348,000	6.37	71,000
Total	2,382,000	7.85	601,000	10,605,000	6.70	2,284,000

Table 7: Osborne-Bell Deposit Inferred Mineral Resource Estimate ⁽²⁾

Cut-off grade	Tonnes	Grade (g/t)	Au Ounces
> 6.00 g/t Au	883,000	9.77	277,000
> 5.00 g/t Au	1,273,000	8.44	346,000
> 4.00 g/t Au	1,816,000	7.26	424,000
> 3.50 g/t Au	2,156,000	6.70	465,000
> 3.00 g/t Au	2,587,000	6.13	510,000
> 2.50 g/t Au	3,166,000	5.51	560,000

Resources estimate notes and resource modeling notes, are shown in a further section. Silver has not been assayed and estimated for both deposits.

Capital and Operating Cost Summary

Table 8: Capital Cost Summary*

Capital Costs (C$M)	Pre-production	Sustaining	Total
Mining	72.7	309.0	381.6
Mineral Processing Plant	107.6		107.6
Mine Surface Facilities	23.5	24.5	47.9
Plant Site Infrastructure	19.2	2.1	21.3
Tailings and Water Management	48.9	35.5	84.4
Indirects	73.7		73.7
Site Restoration (net of salvage value)		40.6	40.6
Subtotal	345.5	411.7	757.2
Contingency	51.8		51.8
Total Capital Costs	397.3	411.7	809.0
Production Revenue NSR**	19.9	2,928.3	2,948.2

CAPEX per Oz (US$/oz)	356.8
OPEX per Oz (US$/oz)	522.4
All-In Cost per Oz (US$/oz)	879.2

*Totals may differ due to rounding. **The Company anticipates having pre-production revenues during development.

Table 9: Operating Cost Summary

Operating Costs	C$/t Milled
Mining	63.82
Mineralized Material Transportation	14.26
Processing	26.89
Tailing & Water Management	3.59
General & Administration	17.93
Total Operating Costs	126.47

Mining

The Windfall Project will consist of the simultaneous exploitation of two separate deposits: Windfall and Osborne-Bell. The overall strategy is to have production from Osborne-Bell complement the production from Windfall to achieve a total production rate of 3,200 tonnes per day (“tpd”).

The Windfall Project is located 115 km east of Lebel-sur-Quévillon in the James Bay region of Québec. The mineral resources used in the mine plan are contained in three different zones (Lynx, Main and Underdog) over a length of 2,300 metres and span from surface down to a depth of approximately 1,200 metres. Each zone is characterized by multiple tabular panels which mainly trend ENE and dip vertically to sub-vertically. The mining method selected is long-hole with longitudinal retreat on panels with minimum dimensions of 20 (length) x 20 (height) metres and minimum thicknesses of 3.5 to 4.0 metres. Mineralized material will be extracted using a fleet of 14 tonne load-haul-dumps (“LHDs”) and 50 tonne haul trucks using a ramp at a rate of 2600 tpd.

The Osborne-Bell deposit is located 17 km northwest of Lebel-sur-Quévillon in the James Bay region of Québec. The mineral resources used in the mine plan are contained in three zones (East, Centre and West) over a length of 1,300 metres and span from surface down to a depth of approximately 520 metres. Each zone is characterized by multiple lenses which mainly trend northwest-southeast and plunge vertically to sub-vertically to the north. The main mining method selected is long-hole with longitudinal retreat. Mineralized material will be extracted using a fleet of 7 tonne LHDs and 45 tonne haul trucks using a ramp at a rate of 600 tpd.

Mineralized material from Windfall and Osborne-Bell mine sites will be transported to the process plant. Transport will be performed by a contractor.

Processing

A total of 3,200 tpd ROM will be processed at the Lebel-sur-Quévillon Plant site. The processing plant consists of a jaw crusher, mineralized material reclaim system and storage (2,100 t live capacity), a primary SAG mill (22’ x 11’) and a secondary Ball Mill (15’ x 27’) in close circuit with cyclones producing a product of P₈₀= 45 microns. A portion of the cyclone underflow will be fed to the gravity circuit with intensive leach. Cyclone overflow will be fed to an eight (8) tanks carbon-in–leach (“CIL”) circuit (40 hr retention time), followed by cyanide destruction and tailings disposal. A six (6) t carbon per day processing adsorption-desorption-recovery (“ADR”) circuit and gold room recover the gold and produce doré. The plant also includes a reagent preparation area and two process water circuits (cyanide bearing and cyanide-free) to service the entire plant.

Gold and silver metal would be recovered. The process plant would produce doré bars, and the payable gold recovery is estimated to average 92.4% and 68.9% for silver over the LOM.

The process plant would also include a wet laboratory, mill offices, a mill dry, a first aid office and a maintenance shop.

Surface infrastructure and indirects

The Windfall Project comprises two different mining sites and one plant site. Windfall mine site will be 115 km east of the Plant site and Osborne-Bell mine site will be 23 km northwest from the Plant site. As previously stated all sites are located in the James Bay region of Québec.

The Windfall Project envisions construction or upgrade of the following key surface infrastructure items: Windfall and Osborne-Bell Mine sites access, Lebel-sur-Quévillon Process Plant, on-site control gate and parking area, overhead transmission line from Lebel-sur-Quévillon to the Plant site, 120 kV Plant site substation fed from the Hydro-Québec grid, Osborne-Bell main electrical substation (25 kV), Process Plant maintenance shop, administration building, service building, pumping station for fresh water, drinking water and fire protection at Plant site, wastewater treatment at Plant site, surface tailings management facility at Plant site, Windfall Mining complex comprising the mine dry, offices, cafeteria, fitness room and dormitory, Osborne-Bell site dry, office, warehouse and truck shop, water treatment plants and overburden stockpiles on all sites, and waste rock stockpiles on Windfall and Osborne-Bell Mine sites. Several key infrastructures such as power plant, waste water treatment and 13.8 kV overhead transmission lines are already in place at the Windfall Mine site.

Indirect costs such as owner’s costs, engineering, procurement and construction management, temporary facilities for construction and other related items are estimated at $73.7 million. An additional $51.8 million has been budgeted as contingency for specific direct and indirect costs.

Environment and Restauration

The Project is subject to both the provincial and federal Environmental Assessment (“EA”) processes. The Windfall Mine site is located on territory governed by the James Bay and Northern Québec Agreement (“JBNQA”), subject to the Environmental and Social Impact Assessment (“ESIA”) and review process. All mining projects located in the JBNQA territory are subject to the Environment Quality Act (“EQA”) and the JBNQA. Since the processing rate of the Plant exceeds 2,000 tpd, the processing plant will be subject to the Quebec provincial southern permitting regime requiring that consultation on the project is done by the Bureau des audiences publiques sur l’environnement (“BAPE”). The Project is subject to a federal EA, triggered by construction and operation of a new gold mine, other than a placer mine, with an ore production capacity of 600 tpd or more.

Environmental baseline data collection has been initiated for the two mine site areas and the plant site. All the collected baseline data will inform the ESIA, which is currently underway. The environmental baseline studies will also support the on-going permitting process and the future permit applications, once the EA approvals have been received.

In addition to provincial and federal EA approvals, the Project will require several approvals, permits and authorizations prior to start-up and throughout all stages of the Project. Requests for these approvals will be initiated following the receipt of the EA approvals. The Project must also comply with any other terms and conditions associated with the authorization issued by the provincial and federal regulations.

A closure and rehabilitation plan for the sites has been developed in accordance with the Mining Act of Québec. Sites restoration costs were estimated at $58.8 million, less $18.3 million of equipment salvage value, resulting in a restoration cost (net of salvage value) of $40.6M. The sites restoration cost estimate for the Windfall Project is based on returning the site to a satisfactory state that mainly includes eliminating all unacceptable risks to the health and the safety of persons, dismantling of the buildings and infrastructure erected for the operations of the mines and processing plant, the restoration of the tailings management facilities and waste rock stockpiles. This cost estimate includes the cost of sites restoration as well as post-closure monitoring. In accordance with the regulations, the Corporation intends to post a bond as a guarantee for the sites restorations cost.

Stakeholder engagement

Osisko has taken a proactive approach toward stakeholder consultation, holding more than 70 meetings since 2015. Three First Nation communities have a potential interest in the Windfall Lake and Osborne Bell: the Cree First Nation of Waswanipi, the Lac-Simon Anishinabeg First Nation and the Atikamekw First Nation of Obedjiwan. The communities of Lebel-sur-Quévillon, Senneterre and Chibougamau are also in close proximity to the project. Consultation on the project with Aboriginal and non-Aboriginal communities was initiated in 2015 and has continued with frequent notifications on project activities, meetings, open house presentations and employment and contracting opportunities.

Concerns raised by communities include land disturbance, water quality, impacts to wildlife and the cumulative effects of all projects in the area. Osisko is committed to continuing the dialogue with potentially affected communities through the environmental assessment process.

Both the Aboriginal and non-Aboriginal communities have expressed strong support for the project. Their main interest in the project is to maximize the economic benefits for local communities – specifically with a focus on employment and entrepreneurial opportunities throughout the phases of the project. In 2017 approximately 80 First Nations’ community members worked at the Windfall site and Osisko spent over $20 Million dollars in the purchase of goods and services from First Nations and local suppliers and contractors.

Royalties

A 2.5% NSR on all metals produced from the Windfall Project has been applied. There is no royalty on the Osborne-Bell deposit.

Notes

(1) Mineral Resource Estimates notes for Windfall Lake Deposit

The independent qualified person for the 2018 MRE, as defined by NI 43 101, is Judith St-Laurent, P. Geo, of InnovExplo Inc. The effective date of the estimate is May 5, 2018.
The Windfall mineral resource estimate is compliant with CIM standards and guidelines for reporting mineral resources and reserves.
Resources are presented undiluted and in situ and are considered to have reasonable prospects for economic extraction.
The mineral resource estimate encompasses a total of 124 tabular, subvertical gold-bearing domains each defined by individual wireframes with a minimum true thickness of 2.0 m.
Samples were composited within the mineralization domains into 2.0 m length composites. A value of zero grade was applied in cases of core not assayed.
High grade capping was done on composite data, and established using a statistical analysis on a per-zone basis for gold. Capping varied from 15 g/t Au to 75 g/t Au and was applied using a four-step capping strategy where capping values decreased as interpolation distances increased.
Density values were applied on the following lithological basis (t/m³): mafic volcanic host rocks varied from 2.78 to 2.86; felsic volcanic host rocks varied from 2.76 to 2.77; porphyries varied from 2.70 to 2.83.
OK based interpolation was used for the estimation of all zones of the Windfall gold deposit except for the Underdog zone where an ID² interpolation was preferred due to the larger drill spacing and smaller density of drill holes informing the mineralization wireframes. All estimates are based on a block dimension of 5 m NE, 2 m NW and 5 m height and estimation parameters determined by variography.
Estimates use metric units (metre, tonne and g/t). Metal contents are presented in troy ounce (metric tonne x grade / 31.10348).
InnovExplo is not aware of any known environmental, permitting, legal, title-related, taxation, socio-political or marketing issues, or any other relevant issue not reported in the technical report, that could materially affect the mineral resource estimate.
These mineral resources are not mineral reserves as they do not have demonstrated economic viability. The quantity and grade of reported Inferred resources in this MRE are uncertain in nature and there has been insufficient exploration to define these Inferred resources as Indicated or Measured, and it is uncertain if further exploration will result in upgrading them to these categories.
The number of metric tons and ounces was rounded to the nearest unit. Any discrepancies in the totals are due to rounding effects; rounding followed the recommendations in Form 43 101F1.

(2) Mineral Resource Estimates notes for Osborne-Bell Deposit

The independent and qualified person for the mineral resource estimate, as defined by NI 43‑101, is Pierre-Luc Richard, P.Geo. (BBA), and the effective date of the estimate is March 2, 2018.
These mineral resources are not mineral reserves as they do not have demonstrated economic viability. The quantity and grade of reported Inferred resources in this MRE are uncertain in nature and there has been insufficient exploration to define these Inferred resources as Indicated or Measured, and it is uncertain if further exploration will result in upgrading them to these categories.
Resources are presented undiluted and in situ for an underground scenario and are considered to have reasonable prospects for economic extraction.
The estimate encompasses nine gold-bearing zones each defined by individual wireframes with a minimum true thickness of 2 m.
High-grade capping was done on composite data and established on a per zone basis for gold. It varies from 25 g/t to 55 g/t.
Density values were applied on the following lithological basis (g/cm³): volcanic rocks = 2.80; late barren dikes and Beehler stock = 2.78; Zebra felsic unit = 2.72.
Grade model resource estimation was evaluated from drill hole data using an Ordinary Kriging interpolation method on a block model using a block size of 2.5 m x 2.5 m x 2.5 m.
The estimate is reported at 3.00 g/t Au cut-off. The cut-off grade was calculated using the following parameters: mining cost = CAD80; processing cost = CAD40; G&A = CAD10; gold price = USD1,300/oz; CAD:USD exchange rate = 1.29 (1-year trailing average). The cut-off grade should be re-evaluated in light of future prevailing market conditions (metal prices, exchange rate, mining cost, etc.).
The mineral resource estimate presented herein is categorized as inferred mineral resource. The inferred mineral resource category is only defined within the areas where drill spacing is less than 100 m and shows reasonable geological and grade continuity.
The mineral resource estimate was prepared using GEOVIA GEMS 6.8. The estimate is based on 931 surface DDH. A minimum true thickness of 2.0 m was applied, using the grade of the adjacent material when assayed, or a value of zero when not assayed.
Calculations used metric units (metre, tonne, gram per tonne). Metal contents are presented in troy ounces (tonne x grade / 31.10348).
The number of metric tons was rounded to the nearest thousand. Any discrepancies in the totals are due to rounding errors.
CIM definitions and guidelines for mineral resources have been followed.
The author is not aware of any known environmental, permitting, legal, title-related, taxation, socio-political or marketing issues, or any other relevant issue not reported in this Technical Report, that could materially affect the mineral resource estimate.

Independent Qualified Persons

This PEA was prepared for Osisko by BBA Inc and other industry consultants, all Qualitied Persons (QP) under National Instrument 43-101. The QPs have reviewed and approved the content of this press release. Independent QPs include:

Colin Hardie, P.Eng., Jorge Torrealba, P.Eng., Pierre-Luc Richard, P. Geo. (BBA)
Patrick Frenette, P.Eng., Judith St-Laurent, P. Geo. (InnovExplo)
Anne-Marie Dagenais, P. Eng., Michael BrattyP. Eng., Paul Palmer, P. Eng. (Golder)
Eric Poirier, P. Eng., Simon Latulippe, P.Eng. (WSP)
Luc Gaulin, P. Eng. (SNC-Lavalin Stavibel)

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 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 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 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 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 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 DEEP DRILLING GOLD DISCOVERY AT WINDFALL NEW WIDE HIGH-GRADE TRIPLE 8 ZONE 20.4 g/t Au over 28.3 Metres Including 44.5 g/t over 10.0 Metres, 81.1 g/t over 4.0 Metres

Posted on July 11, 2018November 8, 2023 by Yannick Fradette

(Toronto, July 11, 2018) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to announce the discovery of a new wide zone of high-grade gold mineralization at depth, at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

In May 2018 Osisko commenced two deep exploration drill holes (“Deep Underdog” and “Deep Lynx”) to investigate the potential for depth extensions of the Lynx and Underdog mineralized zones, as well as to further test the intrusion-related geological model for the Windfall deposit. Both holes are still in progress and are advancing towards their primary targets in the outer shell of the porphyry intrusion, at depths of approximately 2500 metres from surface.

The new “Triple 8 Zone”, open in all directions, was discovered in the Deep Underdog hole, DDH OSK-W-18-1603. Triple 8 is an unanticipated zone of mineralization intersected at approximately 1500 metres downhole, in the planned 2500 metre deep hole. Triple 8 does not correlate with any known zone and is approximately 660 metres east from the closest known mineralized intercept in the Underdog Zone. Maps and sections showing the location of the drill hole and the new mineralized zone are provided on the Corporation’s website. The new discovery zone falls well outside the area of the recently announced mineral resource estimate for the Windfall gold deposit (see Osisko news release dated May 14^th, 2018: “Osisko Releases Its First Mineral Resource for the Windfall Gold Deposit”).

Osisko President and CEO John Burzynski commented: “This spectacular new discovery is further proof of concept that the Windfall mineralized system has the potential for world-class grade and scale. This deep hole confirms management’s view that there is significant high-grade gold mineralization at depth, and it underscores what our geological model has been indicating from the beginning: there is a lot of room for Windfall to grow. We are beginning to see increasing intensity in the key alteration and sulfide mineralization as we progress deeper towards what we believe may be the main mineralized centre of the intrusive system. The Triple 8 Zone is over 600 metres distant from any previously known intersection of gold mineralization at Windfall. The original target for this hole is the down-plunge depth extension of the Underdog Zone, which we continue to drill towards a further 750 metres downhole. We believe we have a tiger by the tail.”

The Triple 8 Zone appears to be sub-vertical and was encountered between 1491.3 meters to 1519.6 metres downhole, at a vertical depth of 1025 metres. True thickness is estimated at 20 metres. Mineralization consists of up to 30% disseminated pyrite and pyrite stringers with local visible gold. The mineralization is hosted in altered andesite, with locally pervasive grey silicification and sericitization. Triple 8 is followed by 9 metres (downhole) of chlorite-biotite and garnet alteration, a higher-temperature alteration assemblage than what has been encountered in mineralized zones at Windfall to date. This appears to be a new style of mineralization at Windfall, as mineralizing fluids followed flow contacts inside the andesite host rather than felsic intrusive contacts (no intrusion is directly associated with this Triple 8 intersection). The zone also contains minor, chalcopyrite, pyrrhotite, arsenopyrite and anomalous molybdenum and zinc values. A number of mineralized sub-zones were also encountered in the hanging wall and the footwall of the new mineralized zone, with assays pending.

Today’s results include the currently available significant analytical results from the new discovery zone only, as the drill hole is still in progress. Maps showing the drill hole location and 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	Mineralized Area
OSK-W-18-1603	1491.3	1519.6	28.3	20.4	17.7	Triple 8
including	1501.0	1511.0	*10.0*	*44.5*	*36.9*
including	1501.0	1505.0	*4.0*	*81.1*	*62.0*

individual interval	1491.3	1492.0	0.7	4.29		Triple 8
	1492.0	1492.6	0.6	63.1
	1492.6	1493.6	1.0	1.69
	1493.6	1494.2	0.6	9.08
	1494.2	1495.0	0.8	2.25
	1495.0	1496.0	1.0	4.33
	1496.0	1497.0	1.0	11.7
	1497.0	1498.0	1.0	1.90
	1498.0	1499.0	1.0	3.06
	1499.0	1500.0	1.0	2.54
	1500.0	1501.0	1.0	4.28
	1501.0	1501.5	0.5	43.5
	1501.5	1502.0	0.5	15.5
	1502.0	1502.9	0.9	83.4
	1502.9	1503.5	0.6	227	100
	1503.5	1504.5	1.0	42.5
	1504.5	1505.0	0.5	82.1
	1505.0	1505.8	0.8	16.2
	1505.8	1506.3	0.5	52.9
	1506.3	1507.2	0.9	4.13
	1507.2	1507.9	0.7	19.4
	1507.9	1508.5	0.6	19.2
	1508.5	1509.4	0.9	7.16
	1509.4	1510.1	0.7	8.90
	1510.1	1510.4	0.3	100	100
	1510.4	1511.0	0.6	15.9
	1511.0	1511.8	0.8	5.87
	1511.8	1512.6	0.8	5.50
	1512.6	1513.6	1.0	9.11
	1513.6	1514.3	0.7	9.03
	1514.3	1514.8	0.5	3.21
	1514.8	1515.1	0.3	9.08
	1515.1	1515.8	0.7	6.29
	1515.8	1516.4	0.6	6.30
	1516.4	1516.9	0.5	5.11
	1516.9	1518.2	1.3	6.88
	1518.2	1518.6	0.4	5.08
	1518.6	1519.6	1.0	4.75

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

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Section
OSK-W-18-1603	35	-80	In Progress	453340	5434543	3275

OSK-W-18-1603 Mineralization is hosted in a pervasive altered andesite and is subdivided into two distinct intervals. The first interval from 1491.3 metres to 1501.0 metres contains up to 10% disseminated pyrite and stringers, 1% pyrrhotite in nodules, trace chalcopyrite replacing pyrite and local trace arsenopyrite. In the second interval mineralization is hosted in strong pervasive silica alteration and moderate sericite alteration, containing up to 30% pyrite stringers, up to 8% disseminated pyrite, pyrrhotite patches, trace chalcopyrite and local visible gold occurs within the silica alteration and as fracture filling.

Qualified Person

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

Quality Control and Reporting Protocols

True width determination for the Triple 8 Zone is currently undetermined but is estimated at 65-80% of the reported core length interval. Assays are uncut except where indicated. Intercepts occur within geological confines of a major zone but have not been correlated to individual vein domain at this time. 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 (i) ALS Laboratories in Val d’Or, Québec, Thunder Bay, Ontario, Sudbury, Ontario or Vancouver, British Colombia, or (ii) 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 are performed by a “qualified person” 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 Osisko comprises 2,382,000 tonnes at 7.85 g/t Au (601,000 ounces) in the indicated category and 10,605,000 tonnes at 6.70 g/t Au (2,284,000 ounces) in the inferred category. See the technical report, entitled “Technical Report and Mineral Resource Estimate for the Windfall Lake Project, Windfall Lake and Urban-Barry Properties” and dated June 12, 2018 (effective date of May 14, 2018), which has been prepared by InnovExplo Inc. from Vald’Or, Québec, and is available on SEDAR (www.sedar.com) under Osisko’s issuer profile. The Windfall Lake gold deposit is currently one of the highest grade resource-stage gold projects in Canada. Mineralization occurs in four principal zones: Lynx, Zone 27, Caribou, and Underdog. All zones comprise sub-vertical lenses following intrusive porphyry contacts plunging to the northeast. The deposit is well defined from surface to a depth of 900 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 1,200 metres in others, with significant potential to extend mineralization 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 discovery, grade, mineralization and potential of the Triple 8 Zone, if any; the significance of the deep exploration drill holes, if any; the progress of the two deep drill holes; the openness of the Triple 8 Zone; the correlation with the Triple 8 Zone with any known zone; the significance of management’s geological modelling and interpretation of interim drill results; the significance of new results from the ongoing drill program at the Windfall Lake gold project; the significance of assay results presented in this news 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. While this forward-looking information is based on reasonable assumptions and estimates of management as of the date hereof, such forward-looking information inherently 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 MINING ANNOUNCES RESULTS OF ANNUAL AND SPECIAL MEETING OF SHAREHOLDERS

Posted on July 3, 2018November 8, 2023 by Yannick Fradette

Toronto, Ontario (June 29, 2018) – Osisko Mining Inc. (TSX:OSK) (the “Corporation“) is pleased to announce the results of its annual and special meeting of shareholders (the “Meeting“) held earlier today.

A total of 153,895,912 common shares of the Corporation were represented at the Meeting, representing approximately 74.02% of the total number of common shares of the Corporation issued and outstanding.

All matters presented for approval at the Meeting were duly authorized and approved, as follows:

election of all seven management nominees to the board of directors of the Corporation;
appointment of PricewaterhouseCoopers LLP as auditors of the Corporation for the ensuing year and authorization of the directors to fix their remuneration;
approval of new general By-Law No. 1 of the Corporation concerning, among other things, certain governance and advance notice provisions, and repeal the former By-law No. 1 of the Corporation; and
approval of the Stock Option Plan of the Corporation and the unallocated rights, options and other entitlements thereunder.

Detailed voting results regarding the election of directors are as follows:

Name	Voted For (#)	Voted For (%)	Voted Withhold (#)	Voted Withhold (%)
John Burzynski	122,333,644	82.45%	26,044,997	17.55%
Jose Vizquerra	122,260,450	82.40%	26,118,191	17.60%
Sean Roosen	123,540,551	82.26%	26,643,390	17.74%
Patrick F.N. Anderson	129,469,156	86.20%	20,719,297	13.80%
Keith McKay	131,140,228	87.32%	19,048,225	12.68%
Amy Satov	113,304,851	85.44%	19,301,492	14.56%
Bernardo Alvarez Calderon	131,083,885	87.28%	19,104,568	12.72%

Further details on the above matters, including the report of voting results thereon, are set out in the Corporation meeting materials, which are available on SEDAR under the issuer profile of the Corporation at www.sedar.com.

About Osisko Mining Inc.

For further information on the Corporation please contact:

John Burzynski
President & Chief Executive Officer
Tel: (416) 848-9504

ANNUAL AND SPECIAL MEETING OF SHAREHOLDERS of OSISKO MINING INC. (the “Corporation”)

Posted on July 3, 2018November 8, 2023 by Yannick Fradette

June 29, 2017
REPORT OF VOTING RESULTS
National Instrument 51-102 – Continuous Disclosure Obligations(Section 11.3)

MATTERS VOTED UPON
		*Vote By Show of Hands:*
	Outcome of Vote	Votes For	Votes Withheld
The appointment of PricewaterhouseCoopers LLP, as auditor of the Corporation for the ensuing year and authorizing the directors to fix their remuneration	Carried	153,668,890 (99.87%)	201,440 (0.13%)
		*Votes By Ballot:*
	Outcome of Vote	Votes For	Votes Withheld
The election of the following nominees as directors of the Corporation for the ensuing year or until their successors are duly elected or appointed:
John Burzynski	Elected	122,333,644 (82.45%)	26,044,997 (17.55%)
Jose Vizquerra	Elected	122,260,450 (82.40%)	26,118,191 (17.60%)
Sean Roosen	Elected	123,540,551 (82.26%)	26,643,390 (17.74%)
Patrick F.N. Anderson	Elected	129,469,156 (86.20%)	20,719,297 (13.80%)
Keith McKay	Elected	131,140,228 (87.32%)	19,048,225 (12.68%)
Amy Satov	Elected	113,304,851 (85.44%)	19,301,492 (14.56%)
Bernardo Alvarez Calderon	Elected	131,083,885 (87.28%)	19,104,568 (12.72%)
		*Vote By Show of Hands:*
	Outcome of Vote	Votes For	Votes Against
The approval of new general By-Law No. 1 of the Corporation concerning, among other things, certain governance and advance notice provisions, and repeal the former By-Law No. 1 of the Corporation	Carried	148,874,517 (99.14%)	1,288,354 (0.86%)
		*Vote* *By Ballot:*
	Outcome of Vote	Votes For	Votes Against
The approval of the stock option plan of the Corporation and the unallocated rights, options and other entitlements thereunder	Carried	104,515,061 (69.59%)	45,673,392 (30.41%)

Osisko Mining Announces Additional Corporate Governance Changes in Advance of Upcoming Shareholders’ Meeting

Posted on June 25, 2018November 8, 2023 by Yannick Fradette

TORONTO, June 24, 2018 (GLOBE NEWSWIRE) — Osisko Mining Inc (TSX:OSK) (“Osisko” or the “Corporation”) today announces

certain additional corporate governance changes on account of recommendations made by Institutional Shareholder Services and Glass, Lewis & Co. in the course of their review of the matters to be voted on at the upcoming annual and special meeting of shareholders of Osisko to be held on June 29, 2018 (the “Meeting”).

Election of Directors

The policies of Institutional Shareholder Services require the board of directors of Osisko to be comprised of a majority of non-independent directors, applying their criteria of non-independence. As such, the following three directors, who are considered by Institutional Shareholder Services to be non-independent, will not be standing for re-election at the Meeting: Mr. Robert Wares, Mr. Murray John and Mr. David Christie. These three individuals will form part of a scientific, technical and financial advisory committee to provide ongoing services to the board of directors of Osisko. Mr. Robert Wares will continue in his role with the Corporation as Executive Vice-President of Exploration and Resource Development.

At the Meeting, shareholders of Osisko will be asked to vote FOR the following seven directors, the majority of which are considered to be independent by Institutional Shareholder Services and Glass, Lewis & Co.: Mr. John Burzynski, Mr. José Vizquerra, Mr. Sean Roosen, Mr. Patrick F.N. Anderson, Mr. Keith McKay, Ms. Amy Satov and Mr. Bernardo Alvarez Calderon.

The lead independent director after the Meeting is anticipated to be Mr. Patrick F.N. Anderson.

Shareholders are encouraged to vote well in advance of the proxy voting deadline at 10:00 a.m. (Toronto Time) on June 27, 2018.

CONTACT INFORMATION:
John Burzynski
President & Chief Executive Officer
(416) 363-8653

Shareholders who have questions or have not received their proxy or voting instruction form may contact the Corporation’s Proxy
Solicitation Agent:

Laurel Hill Advisory Group
Toll free: 1-877-452-7184 or 416-304-0211 (Collect outside North America)
Email: assistance@laurelhill.com

Osisko Mining Announces Corporate Governance Changes in Advance of Upcoming Shareholders’ Meeting

Posted on June 22, 2018November 8, 2023 by Yannick Fradette

TORONTO, June 22, 2018 (GLOBE NEWSWIRE) — Osisko Mining Inc. (TSX:OSK) (“Osisko” or the “Corporation”) today announces certain corporate governance changes on account of recommendations made by Institutional Shareholder Services in the course of their review of the matters to be voted on at the upcoming annual and special meeting of shareholders of Osisko to be held on June 29, 2018 (the “Meeting”).

In particular, the stock option plan of the Corporation (the “Stock Option Plan”) and certain other equity incentive amendments are being made or clarified as follows:

All awards under the Stock Option Plan (and all other forms of equity compensation) are subject to Osisko’s “Policy on Recoupment of Incentive Compensation” adopted on April 27, 2017 (the “Clawback Policy”). The Clawback Policy has no restrictions relating to when awards were granted. The full text of the Clawback Policy is available for review by shareholders on Corporation’s website at https://www.osiskomining.com/.
Consistent with evolving corporate governance best practices in Canada, the 500,000 options awarded to Mr. John Burzynski, Chief Executive Officer of Osisko, on January 11, 2018, with an exercise price of $3.46, have been amended to vest in equal tranches over a five-year period. These 500,000 options were scheduled to vest (or, in part, have vested) in three equal tranches on January 11, 2018, 2019 and 2020, and have been amended to vest in five equal tranches on January 11, 2019, 2020, 2021, 2022 and 2023.
Consistent with seeking greater alignment between stock performance and Chief Executive Officer total compensation, Mr. Burzynski, Chief Executive Officer of Osisko, is being awarded 25,000 restricted share units in consideration of the option amendments described above. These 25,000 restricted share units cliff vest after three years, and are subject to the achievement of performance-based criteria relating to asset development, financial performance, shareholder returns and sustainability.

Cautionary Note Regarding Forward-Looking Information

This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. Any statement that involves 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. 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.

CONTACT INFORMATION:
John Burzynski
President & Chief Executive Officer
(416) 363-8653

Shareholders who have questions or have not received their proxy or voting instruction form may contact the Corporation’s Proxy Solicitation Agent:

Laurel Hill Advisory Group
Toll free: 1-877-452-7184 or 416-304-0211 (Collect outside North America)
Email: assistance@laurelhill.com

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