232 g/t Au Over 2.0 Metres

195 g/t Au over 2.3 Metres

(Toronto, June 29, 2021) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new analytical results from the ongoing drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

Significant new analytical results presented below include 60 intercepts in 16 drill holes (8 from surface, 8 from underground) and 13 wedges. The infill intercepts are located inside defined February 2021 mineral resource estimate (“MRE”) blocks (see Osisko news release dated February 17, 2021). The expansion intercepts are located outside the February 2021 MRE blocks and either expand resource wireframes or are in a defined zone or corridor but do not yet correlate to a specific wireframe.

Osisko Chief Executive Officer John Burzynski commented: “Drilling at Windfall continues to progress well in both infill and expansion holes. Today’s result include four intervals greater than 180 g/t gold over two metres in three different zones in Lynx and Caribou. Also of note is hole WST-21-0706, which extends a Lynx Southwest wireframe 30 metres towards furface. Results continue to add confidence in the continuity of the deposit and our modelling.”

Selected high-grade intercepts include: 232 g/t Au over 2.0 metres in OSK-W-21-2522; 195 g/t Au over 2.3 metres in OSK-W-21-2470-W3; 180 g/t Au over 2.3 metres in OSK-W-21-777-W1; 186 g/t Au over 2.2 metres in WST-21-0725; 148 g/t Au over 2.2 metres in OSK-W-21-2478-W3; 16.0 g/t Au over 8.2 metres in WST-21-0734A; 24.2 g/t Au over 5.0 metres in OSK-W-21-2526; 52.3 g/t Au over 2.2 metres in OSK-W-21-2520. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Infill Drilling

Hole No.	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t)         cut to 100 g/t	Zone	Corridor
OSK-W-17-777	821.0	823.4	2.4	3.91		UDD_4116	Underdog
	1075.0	1077.0	2.0	11.1		UDD_4915	Underdog
including	1075.9	1076.2	0.3	67.3
OSK-W-17-838	674.0	676.0	2.0	8.27		Caribou_2558	Caribou
including	674.9	675.3	0.4	40.7
OSK-W-20-2280-W8	996.0	998.3	2.3	31.4	30.2	TLX_3163	Triple Lynx
including	997.2	997.7	0.5	106	100
OSK-W-21-1827-W3	796.0	798.0	2.0	6.31		UDD_4121	Underdog
including	796.9	797.3	0.4	27.0
OSK-W-21-1882-W3	809.7	812.0	2.3	3.63		UDD_4100	Underdog
including	810.7	811.0	0.3	26.8
OSK-W-21-2067-W8	1029.0	1031.2	2.2	9.66		TLX_3183	Triple Lynx
	1053.0	1055.0	2.0	20.8		TLX_3163	Triple Lynx
	1087.0	1089.0	2.0	12.8		TLX_3162	Triple Lynx
	1103.0	1105.0	2.0	7.17		TLX_3170	Triple Lynx
including	1104.0	1104.3	0.3	37.4
	1126.0	1128.0	2.0	4.11		TLX_3172	Triple Lynx
OSK-W-21-2275-W6	812.0	814.1	2.1	17.0	15.5	TLX_3184	Triple Lynx
including	813.5	813.8	0.3	111	100
OSK-W-21-2470-W4	967.0	969.0	2.0	15.5		TLX_3163	Triple Lynx
OSK-W-21-2478-W3	862.5	864.7	2.2	148	76.9	TLX_3171	Triple Lynx
including	863.4	864.3	0.9	252	100
	875.1	877.2	2.1	14.4		TLX_3184	Triple Lynx
including	875.1	875.4	0.3	91.2
OSK-W-21-2479-W3	891.0	893.4	2.4	8.36		UDD_4501	Underdog
including	892.0	892.7	0.7	23.6
OSK-W-21-2479-W4	662.9	665.0	2.1	9.62		UDD_4102	Underdog
including	664.0	664.6	0.6	24.1
	678.0	680.0	2.0	19.5		UDD_4102	Underdog
including	679.0	679.6	0.6	46.6
	755.0	757.0	2.0	6.31		UDD_4107	Underdog
OSK-W-21-2512	759.6	761.7	2.1	20.9		UDD_4106	Underdog
including	759.6	760.5	0.9	47.3
	781.0	783.0	2.0	22.2		UDD_4106	Underdog
including	781.8	782.4	0.6	72.1
	862.0	864.3	2.3	6.75		UDD_4905	Underdog
including	864.0	864.3	0.3	23.8
OSK-W-21-2512-W1	667.0	671.7	4.7	12.1		UDD_4116	Underdog
including	668.2	668.5	0.3	64.3
	673.0	675.0	2.0	4.19		UDD_4116	Underdog
including	674.6	675.0	0.4	18.0
	697.0	699.0	2.0	3.85		UDD_4100	Underdog
OSK-W-21-2520	535.8	538.0	2.2	52.3	24.8	Caribou_2232	Caribou
including	537.5	538.0	0.5	221	100
	541.0	543.0	2.0	5.92		Caribou_2232	Caribou
including	542.5	543.0	0.5	19.0
	611.0	613.0	2.0	12.9		Caribou_2233	Caribou
including	611.6	612.2	0.6	39.3
	653.0	655.0	2.0	25.0		Caribou_2206	Caribou
including	654.0	655.0	1.0	49.9
OSK-W-21-2522	654.0	656.0	2.0	3.88		LXM_3304	Lynx
	746.3	748.3	2.0	232	37.2	LXM_3345	Lynx
including	747.6	748.0	0.4	1075	100
OSK-W-21-2523	992.0	994.0	2.0	11.7		UDD_4501	Underdog
including	993.0	994.0	1.0	23.3
OSK-W-21-2526	248.3	253.3	5.0	24.2		F51_6008	F-51
including	248.3	249.2	0.9	63.5
OSK-W-21-2534	538.3	540.4	2.1	17.5		Caribou_2211	Caribou
including	538.3	538.7	0.4	53.0
	543.0	545.4	2.4	25.9	21.6	Caribou_2211	Caribou
including	543.0	543.5	0.5	121	100
WST-21-0682B	116.0	118.0	2.0	6.21		LXM_3311	Lynx
WST-21-0725	238.6	240.8	2.2	186	56.9	TLX_3161	Triple Lynx
including	239.0	239.8	0.8	400	100
	292.0	294.2	2.2	8.13		TLX_3163	Triple Lynx
including	293.6	294.2	0.6	26.8
WST-21-0727A	328.0	330.1	2.1	18.6	17.5	TLX_3163	Triple Lynx
including	328.4	328.7	0.3	108	100
WST-21-0775	429.5	431.5	2.0	4.21		TLX_3165	Triple Lynx
WST-21-0790	283.0	285.1	2.1	12.9		LXSW_3500	Lynx SW
including	283.4	283.7	0.3	87.9
WST-21-0824	304.9	307.5	2.6	11.4		TLX_3185	Triple Lynx
	314.4	318.0	3.6	4.79		TLX_3163	Triple Lynx

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below. UDD = Underdog, LXM = Lynx Main, TLX = Triple Lynx, and LXSW = Lynx Southwest.

Expansion Drilling

Hole No.	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t)         cut to 100 g/t	Zone	Corridor
OSK-W-21-777-W1	377.6	381.6	4.0	8.48		Caribou	Caribou
including	377.6	377.9	0.3	46.2
	442.4	444.7	2.3	180	33.5	Caribou	Caribou
including	444.3	444.7	0.4	942	100
OSK-W-21-2067-W8	1080.0	1082.0	2.0	4.39		Triple Lynx	Triple Lynx
OSK-W-21-2470-W3	1151.0	1153.3	2.3	195	15.9	Triple Lynx	Triple Lynx
including	1152.4	1152.7	0.3	1470	100
OSK-W-21-2478-W3	1055.0	1057.0	2.0	16.4		Triple Lynx	Triple Lynx
including	1056.5	1057.0	0.5	64.1
OSK-W-21-2479-W3	624.7	627.0	2.3	11.6		UDD_4100	Underdog
including	625.1	625.5	0.4	61.4
OSK-W-21-2487-W5	691.5	693.5	2.0	14.8		Lynx 4	Lynx
OSK-W-21-2522	944.3	946.7	2.4	3.90		Lynx 4	Lynx
including	946.2	946.7	0.5	11.1
OSK-W-21-2523	958.0	960.0	2.0	3.80		Underdog	Underdog
	1057.0	1059.0	2.0	7.28		Underdog	Underdog
	1069.0	1071.0	2.0	6.76		Underdog	Underdog
including	1069.8	1070.5	0.7	19.2
WST-21-0706	215.0	217.5	2.5	7.45		Lynx SW	Lynx SW
including	215.9	216.5	0.6	24.6
WST-21-0725	313.5	315.5	2.0	24.1		Triple Lynx	Triple Lynx
including	313.5	314.5	1.0	47.8
	326.0	328.0	2.0	11.6		Triple Lynx	Triple Lynx
including	327.0	328.0	1.0	22.8
WST-21-0734A	259.1	267.3	8.2	16.0	12.3	Lynx SW	Lynx SW
including	266.0	266.5	0.5	161	100
WST-21-0775	211.0	213.0	2.0	14.1		Triple Lynx	Triple Lynx
WST-21-0790	327.0	329.3	2.3	7.41		Lynx SW	Lynx SW
including	327.9	328.2	0.3	54.3

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below. UDD = Underdog, SW = Southwest.

 

Drill hole location

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Elevation	Section
OSK-W-17-777	330	-59	1221	452678	5434500	403	2675
OSK-W-17-838	329	-65	726	453144	5434900	398	3275
OSK-W-20-2280-W8	127	-58	1134	453304	5435639	415	3775
OSK-W-21-777-W1	330	-59	969	452678	5434500	403	2675
OSK-W-21-1827-W3	331	-58	996	452506	5434390	403	2475
OSK-W-21-1882-W3	328	-58	1004	452469	5434406	400	2450
OSK-W-21-2067-W8	123	-53	866	453241	5435696	415	3750
OSK-W-21-2275-W6	127	-49	864	452888	5435583	409	3400
OSK-W-21-2470-W3	132	-59	1209	453304	5435639	415	3775
OSK-W-21-2470-W4	132	-59	1155	453304	5435639	415	3775
OSK-W-21-2478-W3	128	-54	1080	452997	5435607	425	3500
OSK-W-21-2479-W3	344	-55	1014	452315	5434419	399	2325
OSK-W-21-2479-W4	344	-55	402	452315	5434419	399	2325
OSK-W-21-2487-W5	359	-73	771	454135	5435058	397	4225
OSK-W-21-2512	331	-54	855	452448	5434465	400	2475
OSK-W-21-2512-W1	331	-54	1089	452448	5434465	400	2475
OSK-W-21-2520	337	-56	351	452596	5434392	401	2550
OSK-W-21-2522	128	-54	450	453451	5435594	411	3900
OSK-W-21-2523	340	-58	1105	452480	5434428	402	2475
OSK-W-21-2526	159	-44	287	453519	5436029	406	4150
OSK-W-21-2534	343	-59	1203	452549	5434363	401	2500
WST-21-0682B	129	-64	472	453106	5435066	231	3325
WST-21-0706	165	-54	417	453104	5435065	231	3325
WST-21-0725	160	-67	391	453507	5435327	-7	3800
WST-21-0727A	146	-69	361	453507	5435327	-7	3800
WST-21-0734A	129	-56	360	452956	5435003	253	3175
WST-21-0775	153	-44	469	453256	5435210	95	3525
WST-21-0790	171	-65	406	453104	5435065	231	3325
WST-21-0824	156	-70	343	453506	5435327	-7	3800

 

Caribou Zone

Mineralization most commonly occurs in gold-bearing pyrite stockworks as well as semi-massive pyrite replacement zones associated with phyllic alteration (sericite-pyrite ± silica) with sulphides, pyrite dominated with minor chalcopyrite and sphalerite ranging from trace to up to 20%, and local visible gold. Mineralization is hosted in rhyolites or mafic-intermediate volcanics frequently at or near faults or the contact with felsic porphyritic intrusions.

F-Zones

Mineralization is hosted in sheared andesites with carbonate replacement or quartz veining and occurs as quartz ± ankerite veinlets or as replacement type in shear zones and is characterised by trace to 10% pyrite with local visible gold. Alteration is dominated by sericite-fuchsite-tourmaline-pyrite.

Underdog

Mineralization most commonly occurs in gold-bearing quartz-pyrite (± tourmaline) veins and as disseminated, stringer, semi-massive to massive pyrite with minor sphalerite, chalcopyrite and molybdenite associated with strong sericite and silica alteration. Mineralization is hosted along the intrusive contacts of a three-phase composite felsic porphyritic unit which cross-cuts felsic and mafic volcanic sequences.

 

Lynx Zone

Mineralization occurs as grey to translucent quartz-carbonate-pyrite-tourmaline veins and pyrite replacement zones and stockworks. Vein-type mineralization is associated with haloes of pervasive sericite-pyrite ± silica alteration and contain sulphides (predominantly pyrite with minor amounts of chalcopyrite, sphalerite, galena, arsenopyrite, and pyrrhotite) and local visible gold. Replacement mineralization is associated with strong pervasive silica-sericite-ankerite ± tourmaline alteration and contains disseminated pyrite from trace to 80% with local visible gold. Pyrite stockworks can form envelopes that reach several tens of metres thick. Fuchsite alteration is common and is spatially constrained to near the gabbros. Mineralization occurs at or near geological contacts between felsic porphyritic or fragmental intrusions and the host rhyolites or gabbros and locally can be hosted along the gabbro-rhyolite contact.

 

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), Director of Exploration for Osisko’s Windfall 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 estimated at 55-80% 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 3.5 g/t Au diluted over core lengths of at least 2.0 metres. NQ core assays 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, Vancouver, British Colombia, Lima, Peru or Vientiane, Laos (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 a Four Acid Digestion-ICP-MS 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 Gold Deposit

The Windfall gold deposit is located between Val-d’Or and Chibougamau in the Abitibi region of Québec, Canada. The Mineral Resource Estimate (“MRE“) defined by Osisko, as disclosed in the news release dated February 17, 2021 is supported by the technical report entitled “Preliminary Economic Assessment Update for the Windfall Project” dated April 26, 2021 (that includes Windfall Mineral Resource Estimate with an effective date  of November 30, 2020), and assuming a cut-off grade of 3.50 g/t Au, comprises 521,000 tonnes at 11.3 g/t Au (189,000 ounces) in the measured mineral resource category, 5,502,000 tonnes at 9.4 g/t Au (1,668,000 ounces) in the indicated mineral resource category and 16,401,000 tonnes at 8.0 g/t Au (4,244,000 ounces) in the inferred mineral resource category. The key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in the February 17, 2021 news release are further described in the full technical report prepared by BBA Inc. in accordance with NI 43-101 and is available on SEDAR (www.sedar.com) under the Corporation’s issuer profile. The Windfall gold deposit is currently one of the highest-grade resource-stage gold projects in Canada and has world-class scale. Mineralization occurs in three principal zones: Lynx, Main Zone, and Underdog. Mineralization is generally comprised of sub-vertical zones following intrusive porphyry contacts plunging to the northeast. The resources are defined from surface to a depth of 1,600 metres as it now includes the Triple 8 (T8) zone. The resources excluding T8 are defined from surface to a depth of 1,200 metres. The deposit remains open along strike and at depth. Mineralization has been identified at surface in some areas and as deep as 2,625 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 gold resource properties in Canada. Osisko holds a 100% interest 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 Quévillon area (over 2,700 square kilometres).

 

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”, “potential”, “feasibility”, “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 news release contains the forward-looking information pertaining to, among other things: the Windfall gold deposit being one of the highest-grade resource-stage gold projects in Canada and having world-class scale; the key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in this news release; the prospects, if any, of the Windfall gold deposit; timing and ability of Osisko to file a technical report for the mineral resource estimate disclosed in this news release; the timing and ability of Osisko, if at all, to publish a feasibility study for the Windfall gold deposit; the amount and type of drilling to be completed and the timing to complete such drilling; the focus of the remaining infill drilling; the trend of grade increase; the Lynx zone remaining open to expansion down plunge; upgrading a inferred mineral resource to a measured mineral resource or indicated mineral resource category; future drilling at the Windfall gold deposit; the significance of historic exploration activities and results. 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 (infill) drilling; property and royalty interests in the Windfall gold deposit; the ability of the Corporation to obtain required approvals; 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.

 

CONTACT INFORMATION:

John Burzynski
Chief Executive Officer
Telephone (416) 363-8653

385 g/t Au Over 2.1 Metres

45.5 g/t Au over 4.1 Metres

(Toronto, June 23, 2021) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new analytical results from the ongoing drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

Significant new analytical results presented below include 94 intercepts in 30 drill holes (15 from surface, 14 from underground) and 25 wedges. The infill intercepts are located inside defined February 2021 mineral resource estimate (“MRE”) blocks (see Osisko news release dated February 17, 2021). The expansion intercepts are located outside the February 2021 MRE blocks and either expand resource wireframes or are in a defined zone or corridor but do not yet correlate to a specific wireframe.

Osisko Chief Executive Officer John Burzynski commented: “This week’s results from both infill and expansion drilling again report high-grade numbers from across the Windfall deposit. Windfall is performing consistently and continuously as we move into the final stretch of resource-oriented drilling.”

Selected high-grade intercepts include: 385 g/t Au over 2.1 metres in OSK-W-21-2492-W2; 45.5 g/t Au over 4.1 metres in OSK-W-21-777-W1; 28.8 g/t Au over 4.3 metres in WST-21-0789B; 45.8 g/t Au over 2.5 metres and 26.0 g/t Au over 3.8 metres in OSK-W-21-2505; 46.6 g/t Au over 2.4 metres in WST-20-0318; and 21.3 g/t Au over 4.8 metres in OSK-W-20-2397-W1. Maps showing hole locations and full analytical results are available at www.osiskomining.com

Infill Drilling

Hole No.	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t)         cut to 100 g/t	Zone	Corridor
OSK-W-19-1827-W1	1004.8	1007.0	2.2	13.8		UDD_4510	Underdog
OSK-W-20-2275-W2	949.0	951.0	2.0	12.5		TLX_3199	Triple Lynx
OSK-W-20-2292-W2	830.0	832.0	2.0	4.89		TLX_3161	Triple Lynx
OSK-W-20-2313-W10	625.7	627.7	2.0	4.44		TLX_3178	Triple Lynx
OSK-W-20-2371-W1	556.2	558.4	2.2	8.73		TLX_3184	Triple Lynx
OSK-W-20-2397-W1	666.5	671.3	4.8	21.3	18.3	LXM_3304	Lynx
including	670.4	671.0	0.6	125	100
OSK-W-20-2423	1084.9	1087.0	2.1	7.25		UDD_4911	Underdog
including	1085.6	1086.0	0.4	27.0
OSK-W-21-777-W1	569.1	573.2	4.1	45.5	30.4	Caribou_2211	Caribou
including	572.8	573.2	0.4	255	100
OSK-W-21-1827-W3	1089.0	1091.0	2.0	5.02		UDD_4513	Underdog
including	1089.0	1089.3	0.3	32.1
OSK-W-21-1882-W1	800.0	802.2	2.2	28.1		UDD_4100	Underdog
including	801.0	802.2	1.2	46.6
OSK-W-21-1882-W2	491.0	493.0	2.0	6.77		Caribou_2231	Caribou
OSK-W-21-1882-W3	486.5	491.1	4.6	5.41		Caribou_2231	Caribou
including	490.6	491.1	0.5	26.2
OSK-W-21-2067-W7	1095.0	1098.4	3.4	16.6	14.0	TLX_3162	Triple Lynx
including	1097.3	1097.6	0.3	130	100
and	1098.1	1098.4	0.3	38.6
OSK-W-21-2275-W6	800.0	802.0	2.0	10.5		TLX_3171	Triple Lynx
including	800.9	801.5	0.6	28.8
	820.0	822.1	2.1	3.78		TLX_3184	Triple Lynx
including	821.6	822.1	0.5	13.6
OSK-W-21-2463-W3	839.6	841.7	2.1	19.0		UDD_4110	Underdog
including	840.2	840.5	0.3	85.0
	961.4	965.2	3.8	4.80		UDD_4102	Underdog
	977.0	979.0	2.0	8.42		UDD_4102	Underdog
	1116.0	1118.0	2.0	7.52		UDD_4911	Underdog
including	1116.4	1117.1	0.7	20.7
	1140.0	1144.3	4.3	13.0		UDD_4513	Underdog
including	1142.3	1143.0	0.7	26.7
	1191.0	1193.0	2.0	4.46		UDD_4514	Underdog
including	1191.7	1192.1	0.4	20.6
OSK-W-21-2478-W3	878.2	880.6	2.4	8.64		TLX_3184	Triple Lynx
including	879.0	879.6	0.6	31.6
OSK-W-21-2479-W1	627.0	629.2	2.2	10.6		UDD_4100	Underdog
including	627.0	627.5	0.5	32.4
	907.9	910.0	2.1	12.8		UDD_4910	Underdog
including	907.9	908.7	0.8	27.4
OSK-W-21-2479-W3	669.7	672.3	2.6	12.4		UDD_4100	Underdog
including	671.3	672.3	1.0	29.4
	683.0	685.1	2.1	17.1		UDD_4102	Underdog
including	684.5	685.1	0.6	54.0
	693.6	698.0	4.4	14.5		UDD_4104	Underdog
including	694.6	695.0	0.4	33.6
	703.0	705.4	2.4	8.44		UDD_4104	Underdog
including	704.9	705.4	0.5	23.8
	921.0	923.0	2.0	9.81		UDD_4513	Underdog
	949.2	951.6	2.4	6.45		UDD_4910	Underdog
	960.0	962.0	2.0	5.30		UDD_4910	Underdog
including	960.5	960.9	0.4	25.7
	967.7	971.6	3.9	8.29		UDD_4514	Underdog
including	971.0	971.6	0.6	34.6
OSK-W-21-2486	814.5	816.8	2.3	9.02		UDD_4121	Underdog
including	815.7	816.0	0.3	20.1
and	816.5	816.8	0.3	39.6
	1030.0	1032.0	2.0	4.19		UDD_4515	Underdog
including	1030.4	1031.0	0.6	10.8
	1106.0	1108.2	2.2	3.96		UDD_4510	Underdog
including	1107.5	1107.9	0.4	15.9
OSK-W-21-2487-W4	672.0	674.4	2.4	20.8		LX4_3414	Lynx 4
including	672.6	673.2	0.6	56.2
OSK-W-21-2487-W5	700.5	702.9	2.4	12.4		LX4_3414	Lynx
including	702.3	702.9	0.6	49.4
OSK-W-21-2492-W2	783.6	785.7	2.1	385	67.9	LX4_3414	Lynx 4
including	784.3	784.7	0.4	1710	100
OSK-W-21-2499	201.9	204.0	2.1	4.65		F51_6008	F-51
OSK-W-21-2503	1069.0	1071.0	2.0	3.65		TLX_3162	Triple Lynx
	1080.0	1082.1	2.1	39.3		TLX_3162	Triple Lynx
including	1080.3	1081.1	0.8	96.5
OSK-W-21-2505	198.2	202.0	3.8	26.0	24.6	F51_6008	F-51
including	201.0	201.5	0.5	111	100
	206.0	208.5	2.5	45.8		F51_6008	F-51
including	208.0	208.5	0.5	97.3
OSK-W-21-2512	994.5	997.6	3.1	13.5		UDD_4514	Underdog
including	994.5	995.0	0.5	63.7
and	997.0	997.6	0.6	16.1
OSK-W-21-2512-W1	430.0	432.0	2.0	7.95		Caribou_2211	Caribou
	731.0	733.0	2.0	5.00		UDD_4102	Underdog
including	731.7	732.2	0.5	19.4
OSK-W-21-2514	548.8	551.0	2.2	22.2		Caribou_2526	Caribou
including	548.8	549.7	0.9	52.3
OSK-W-21-2518	265.0	267.1	2.1	4.33		F51_6008	F-51
including	265.0	265.4	0.4	22.1
OSK-W-21-2520	551.0	553.0	2.0	18.1		Caribou_2211	Caribou
including	551.0	551.5	0.5	40.5
OSK-W-21-2523	880.0	883.0	3.0	15.1		UDD_4107	Underdog
including	882.0	883.0	1.0	33.8
OSK-W-21-2526	254.8	257.2	2.4	7.74		F51_6008	F-51
including	256.8	257.2	0.4	32.5
WST-20-0318	70.6	73.0	2.4	46.6		LXM_3311	Lynx
including	71.6	72.6	1.0	100
WST-20-0472	108.0	110.0	2.0	39.4		LXM_3304	Lynx
including	108.0	108.7	0.7	100
WST-21-0642	140.9	143.2	2.3	5.43		Bobcat_2350	Bobcat
including	142.8	143.2	0.4	16.2
WST-21-0645	92.0	94.0	2.0	3.90		Bobcat_2350	Bobcat
including	92.0	92.6	0.6	12.3
WST-21-0647	271.0	273.0	2.0	5.55		TLX_3131	Triple Lynx
WST-21-0774	175.0	177.3	2.3	25.1		TLX_3161	Triple Lynx
WST-21-0789B	331.0	333.2	2.2	20.9	15.9	TLX_3166	Triple Lynx
including	332.0	332.3	0.3	137	100
WST-21-0797	127.0	129.1	2.1	38.2	32.1	LXM_3334	Lynx
including	127.9	128.4	0.5	126	100
WST-21-0800	277.6	279.6	2.0	41.0		LXSW_3556	Lynx SW
including	277.6	278.5	0.9	88.5
	309.5	311.6	2.1	3.80		LXSW_3556	Lynx SW
including	310.4	310.8	0.4	11.5
WST-21-0812	188.8	190.9	2.1	13.5		LXSW_3507	Lynx SW
including	190.1	190.9	0.8	35.0

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below. UDD = Underdog, LXM = Lynx Main, LX4 = Lynx 4, TLX = Triple Lynx, and LXSW = Lynx Southwest.

Expansion Drilling

Hole No.	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t)         cut to 100 g/t	Zone	Corridor
OSK-W-20-2406	489.3	492.0	2.7	3.89		Caribou	Caribou
including	490.2	491.0	0.8	12.8
OSK-W-21-777-W1	817.0	819.1	2.1	3.64		Underdog	Underdog
OSK-W-21-777-W2	1014.0	1016.0	2.0	8.54		Underdog	Underdog
including	1014.0	1014.7	0.7	23.0
	1032.9	1035.5	2.6	8.71		Underdog	Underdog
including	1035.1	1035.5	0.4	17.7
OSK-W-21-1882-W1	861.7	863.7	2.0	4.21		Underdog	Underdog
including	863.0	863.7	0.7	12.0
OSK-W-21-2275-W6	830.0	832.0	2.0	6.12		Triple Lynx	Triple Lynx
including	830.5	830.8	0.3	38.2
OSK-W-21-2444	140.7	143.3	2.6	12.9		Caribou	Caribou
	183.8	186.4	2.6	18.4	13.9	Caribou	Caribou
including	184.7	185.0	0.3	139	100
OSK-W-21-2463-W2	797.0	799.2	2.2	3.79		Underdog	Underdog
	1046.9	1049.0	2.1	6.01		Underdog	Underdog
OSK-W-21-2463-W3	1012.8	1015.1	2.3	3.60		Underdog	Underdog
including	1013.3	1013.8	0.5	9.75
	1078.0	1080.2	2.2	11.0		Underdog	Underdog
including	1079.6	1080.2	0.6	35.4
OSK-W-21-2479-W1	618.8	621.0	2.2	15.3		Underdog	Underdog
including	618.8	619.2	0.4	67.7
	854.7	856.8	2.1	4.37		Underdog	Underdog
	896.0	898.0	2.0	8.16		Underdog	Underdog
including	896.9	897.6	0.7	22.7
OSK-W-21-2479-W2	624.6	627.1	2.5	8.19		Underdog	Underdog
including	625.3	625.9	0.6	32.4
	950.9	953.0	2.1	4.20		Underdog	Underdog
including	950.9	951.4	0.5	16.6
	974.0	976.0	2.0	16.3		Underdog	Underdog
OSK-W-21-2479-W3	465.0	467.0	2.0	4.74		Z27	Zone 27
	483.1	485.7	2.6	11.3		Z27_1204	Zone 27
including	485.0	485.7	0.7	30.0
OSK-W-21-2479-W4	473.0	475.0	2.0	8.15		Z27	Zone 27
including	473.4	474.0	0.6	24.7
OSK-W-21-2483	382.0	384.0	2.0	6.33		Caribou	Caribou
OSK-W-21-2490	369.0	371.0	2.0	6.04		Caribou	Caribou
OSK-W-21-2512	430.2	432.3	2.1	4.71		Caribou	Caribou
OSK-W-21-2523	733.6	736.1	2.5	4.79		Underdog	Underdog
WST-21-0663	74.7	77.8	3.1	20.5		Bobcat	Bobcat
including	77.3	77.8	0.5	94.9
WST-21-0800	100.2	102.2	2.0	8.71		Bobcat	Bobcat
including	100.2	101.3	1.1	15.8
WST-21-0727A	358.1	360.8	2.7	6.84		Triple Lynx	Triple Lynx
including	358.1	359.0	0.9	16.2
WST-21-0756	352.2	354.7	2.5	6.91		Triple Lynx	Triple Lynx
WST-21-0789B	248.0	250.0	2.0	37.4	35.1	Lynx SW	Lynx SW
including	248.0	248.7	0.7	107	100
	301.1	305.4	4.3	28.8		Lynx SW	Lynx SW
including	301.1	302.1	1.0	78.4
WST-21-0795A	403.9	406.0	2.1	3.98		Lynx 4	Lynx
including	403.9	404.4	0.5	11.5

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below. Z27 = Zone 27, SW = Southwest.

 

Drill hole location

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Elevation	Section
OSK-W-19-1827-W1	331	-58	1257	452506	5434390	403	2475
OSK-W-20-2275-W2	127	-49	1035	452888	5435583	409	3400
OSK-W-20-2292-W2	125	-54	1002	453035	5435561	420	3525
OSK-W-20-2313-W10	134	-52	1059	452965	5435583	420	3450
OSK-W-20-2371-W1	123	-53	1032	452996	5435363	412	3375
OSK-W-20-2397-W1	131	-58	1200	453451	5435594	412	3900
OSK-W-20-2406	333	-56	693	452633	5434281	400	2525
OSK-W-20-2423	332	-60	1326	452616	5434449	403	2600
OSK-W-21-777-W1	330	-59	969	452678	5434500	403	2675
OSK-W-21-777-W2	330	-59	1170	452678	5434500	403	2675
OSK-W-21-1827-W3	331	-58	996	452506	5434390	403	2475
OSK-W-21-1882-W1	328	-57	1197	452469	5434405	400	2450
OSK-W-21-1882-W2	328	-57	726	452469	5434405	400	2450
OSK-W-21-1882-W3	328	-57	1004	452469	5434405	400	2450
OSK-W-21-2067-W7	123	-53	1166	453241	5435697	416	3750
OSK-W-21-2275-W6	127	-49	864	452888	5435583	409	3400
OSK-W-21-2444	337	-59	636	452715	5434606	397	2775
OSK-W-21-2463-W2	339	-65	1325	452616	5434449	403	2600
OSK-W-21-2463-W3	339	-65	1299	452616	5434449	403	2600
OSK-W-21-2478-W3	128	-54	1080	452997	5435607	425	3500
OSK-W-21-2479-W1	344	-55	972	452315	5434419	399	2325
OSK-W-21-2479-W2	344	-55	990	452315	5434419	399	2325
OSK-W-21-2479-W3	344	-55	1014	452315	5434419	399	2325
OSK-W-21-2479-W4	344	-55	402	452315	5434419	399	2325
OSK-W-21-2483	328	-58	756	452731	5434634	397	2800
OSK-W-21-2486	334	-57	1167	452596	5434392	401	2550
OSK-W-21-2487-W4	359	-73	768	454135	5435058	397	4225
OSK-W-21-2487-W5	359	-73	771	454135	5435058	397	4225
OSK-W-21-2490	338	-61	786	452756	5434466	400	2725
OSK-W-21-2492-W2	122	-53	879	453687	5435676	401	4125
OSK-W-21-2499	158	-45	240	453484	5435967	403	4100
OSK-W-21-2503	126	-58	1080	453333	5435641	413	3800
OSK-W-21-2505	172	-42	243	453484	5435967	403	4100
OSK-W-21-2512	331	-54	855	452448	5434465	400	2475
OSK-W-21-2512-W1	331	-54	1089	452448	5434465	400	2475
OSK-W-21-2514	134	-55	618	452768	5435313	406	3150
OSK-W-21-2518	163	-46	282	453519	5436029	405	4150
OSK-W-21-2520	337	-56	351	452596	5434392	401	2550
OSK-W-21-2523	340	-58	114	452480	5434428	402	2475
OSK-W-21-2526	159	-44	287	453519	5436029	406	4150
WST-20-0318	149	-53	502	453227	5435125	135	3475
WST-20-0472	149	-23	223	453493	5435287	117	3775
WST-21-0642	149	-38	172	452955	5435003	253	3175
WST-21-0645	173	5	153	452954	5435002	255	3175
WST-21-0647	150	-59	345	453228	5435126	135	3475
WST-21-0663	164	-40	214	452954	5435003	253	3175
WST-21-0727A	146	-69	361	453507	5435327	-7	3800
WST-21-0756	131	-43	411	453357	5435273	15	3650
WST-21-0774	148	-40	724	453373	5435296	-26	3675
WST-21-0789B	125	-55	381	453106	5435066	231	3325
WST-21-0795A	153	-41	415	453257	5435209	96	3525
WST-21-0797	136	-47	136	453322	5435235	55	3600
WST-21-0800	135	-55	346	452954	5435003	252	3175
WST-21-0812	149	-51	370	452954	5435003	253	3175

 

Caribou Zone

Mineralization most commonly occurs in gold-bearing pyrite stockworks as well as semi-massive pyrite replacement zones associated with phyllic alteration (sericite-pyrite ± silica) with sulphides, pyrite dominated with minor chalcopyrite and sphalerite ranging from trace to up to 20%, and local visible gold. Mineralization is hosted in rhyolites or mafic-intermediate volcanics frequently at or near faults or the contact with felsic porphyritic intrusions.

 

Zone 27

Mineralization most commonly occurs as replacement-type characterized by 5% to 50% disseminated, stringer, semi-massive or stockwork pyrite, ptygmatic tourmaline veins, quartz-tourmaline crustiform veins, local quartz-carbonate veins, and local visible gold. Mineralization is associated with moderate to strong sericite, weak to strong silica, weak chlorite and carbonate and locally weak fuchsite and is hosted in strongly altered andesites, in or at the contact of the rhyolite, or along the contacts with felsic porphyritic intrusions.

F-Zones

Mineralization is hosted in sheared andesites with carbonate replacement or quartz veining and occurs as quartz ± ankerite veinlets or as replacement type in shear zones and is characterised by trace to 10% pyrite with local visible gold. Alteration is dominated by sericite-fuchsite-tourmaline-pyrite.

 

Bobcat

Mineralization most commonly occurs in gold-bearing quartz-pyrite veins controlled by northeast trending faults and shears and to a lesser extent in minor crustiform quartz-tourmaline-ankerite-pyrite veins and pyrite replacement zones and stockwork. Mineralization is hosted in sheared mafic volcanics, rhyolites near faults, or at the contact with felsic porphyritic intrusions.

Underdog

Mineralization most commonly occurs in gold-bearing quartz-pyrite (± tourmaline) veins and as disseminated, stringer, semi-massive to massive pyrite with minor sphalerite, chalcopyrite and molybdenite associated with strong sericite and silica alteration. Mineralization is hosted along the intrusive contacts of a three-phase composite felsic porphyritic unit which cross-cuts felsic and mafic volcanic sequences.

 

Lynx Zone

Mineralization occurs as grey to translucent quartz-carbonate-pyrite-tourmaline veins and pyrite replacement zones and stockworks. Vein-type mineralization is associated with haloes of pervasive sericite-pyrite ± silica alteration and contain sulphides (predominantly pyrite with minor amounts of chalcopyrite, sphalerite, galena, arsenopyrite, and pyrrhotite) and local visible gold. Replacement mineralization is associated with strong pervasive silica-sericite-ankerite ± tourmaline alteration and contains disseminated pyrite from trace to 80% with local visible gold. Pyrite stockworks can form envelopes that reach several tens of metres thick. Fuchsite alteration is common and is spatially constrained to near the gabbros. Mineralization occurs at or near geological contacts between felsic porphyritic or fragmental intrusions and the host rhyolites or gabbros and locally can be hosted along the gabbro-rhyolite contact.

 

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), Director of Exploration for Osisko’s Windfall 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 estimated at 55-80% 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. NQ core assays 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, Vancouver, British Colombia, Lima, Peru or Vientiane, Laos (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 a Four Acid Digestion-ICP-MS 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 Gold Deposit

The Windfall gold deposit is located between Val-d’Or and Chibougamau in the Abitibi region of Québec, Canada. The Mineral Resource Estimate (“MRE“) defined by Osisko, as disclosed in the news release dated February 17, 2021 is supported by the technical report entitled “Preliminary Economic Assessment Update for the Windfall Project” dated April 26, 2021 (that includes Windfall Mineral Resource Estimate with an effective date  of November 30, 2020), and assuming a cut-off grade of 3.50 g/t Au, comprises 521,000 tonnes at 11.3 g/t Au (189,000 ounces) in the measured mineral resource category, 5,502,000 tonnes at 9.4 g/t Au (1,668,000 ounces) in the indicated mineral resource category and 16,401,000 tonnes at 8.0 g/t Au (4,244,000 ounces) in the inferred mineral resource category. The key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in the February 17, 2021 news release are further described in the full technical report prepared by BBA Inc. in accordance with NI 43-101 and is available on SEDAR (www.sedar.com) under the Corporation’s issuer profile. The Windfall gold deposit is currently one of the highest-grade resource-stage gold projects in Canada and has world-class scale. Mineralization occurs in three principal zones: Lynx, Main Zone, and Underdog. Mineralization is generally comprised of sub-vertical zones following intrusive porphyry contacts plunging to the northeast. The resources are defined from surface to a depth of 1,600 metres as it now includes the Triple 8 (T8) zone. The resources excluding T8 are defined from surface to a depth of 1,200 metres. The deposit remains open along strike and at depth. Mineralization has been identified at surface in some areas and as deep as 2,625 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 gold resource properties in Canada. Osisko holds a 100% interest 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 Quévillon area (over 2,700 square kilometres).

 

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”, “potential”, “feasibility”, “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 news release contains the forward-looking information pertaining to, among other things: the Windfall gold deposit being one of the highest-grade resource-stage gold projects in Canada and having world-class scale; the key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in this news release; the prospects, if any, of the Windfall gold deposit; timing and ability of Osisko to file a technical report for the mineral resource estimate disclosed in this news release; the timing and ability of Osisko, if at all, to publish a feasibility study for the Windfall gold deposit; the amount and type of drilling to be completed and the timing to complete such drilling; the focus of the remaining infill drilling; the trend of grade increase; the Lynx zone remaining open to expansion down plunge; upgrading a inferred mineral resource to a measured mineral resource or indicated mineral resource category; future drilling at the Windfall gold deposit; the significance of historic exploration activities and results. 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 (infill) drilling; property and royalty interests in the Windfall gold deposit; the ability of the Corporation to obtain required approvals; 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.

 

CONTACT INFORMATION:

John Burzynski
Chief Executive Officer
Telephone (416) 363-8653

184 g/t Au Over 2.1 Metres

34.1 g/t Au over 7.1 Metres

(Toronto, June 17, 2021) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new analytical results from the ongoing drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

Significant new analytical results presented below include 68 intercepts in 22 drill holes (2 from surface, 20 from underground) and 15 wedges. The infill intercepts are located inside defined February 2021 mineral resource estimate (“MRE”) blocks (see Osisko news release dated February 17, 2021). The expansion intercepts are located outside the February 2021 MRE blocks and either expand resource wireframes or are in a defined zone or corridor but do not yet correlate to a specific wireframe.

Osisko Chief Executive Officer John Burzynski commented: “The continued success of the infill and expansion drill programs at Lynx demonstrate how robust the system is with respect to grade and growth.  Windfall is demonstrating its consistency with more high-grade infill and expansion holes, and we expect to complete our major drill program as scheduled this fall.”

Selected high-grade intercepts include: 184 g/t Au over 2.1 metres in OSK-W-21-2480-W3; 34.1 g/t Au over 7.1 metres in OSK-W-21-2495-W1, 94.1 g/t Au over 2.0 metres in OSK-W-21-2487-W4, 40.3 g/t Au over 4.0 metres and 41.2 g/t Au over 2.9 metres in OSK-W-21-2067-W7; 36.0 g/t Au over 4.0 metres in OSK-W-21-2503; and 41.0 g/t Au over 2.5 metres in OSK-W-21-2465-W2. Maps showing hole locations and full analytical results are available at www.osiskomining.com

Infill Drilling

Hole Number	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t)         cut to 100 g/t	Zone	Corridor
OSK-W-21-2067-W7	1029.0	1033.0	4.0	5.08		TLX_3183	Triple Lynx
	1039.5	1042.4	2.9	41.2	21.7	TLX_3183	Triple Lynx
including	1039.5	1039.8	0.3	180	100
and	1042.1	1042.4	0.3	209	100
	1115.0	1119.0	4.0	40.3	18.6	TLX_3170	Triple Lynx
including	1117.0	1117.5	0.5	274	100
	1132.1	1134.2	2.1	34.2	15.5	TLX_3172	Triple Lynx
including	1133.9	1134.2	0.3	231	100
OSK-W-21-2478-W3	891.1	893.4	2.3	5.78		TLX_3161	Triple Lynx
including	892.7	893.4	0.7	14.2
OSK-W-21-2478-W4	842.8	846.5	3.7	7.00		TLX_3171	Triple Lynx
	863.9	866.0	2.1	4.13		TLX_3184	Triple Lynx
	874.3	876.3	2.0	26.2		TLX_3184	Triple Lynx
including	874.3	874.7	0.4	90.3
	877.7	880.2	2.5	5.65		TLX_3161	Triple Lynx
including	879.7	880.2	0.5	20.0
OSK-W-21-2480-W3	757.4	759.5	2.1	184	78.2	LXM_3304	Lynx
including	758.4	759.2	0.8	350	100
OSK-W-21-2480-W4	734.6	737.2	2.6	8.59		LXM_3304	Lynx
including	734.6	735.2	0.6	23.3
OSK-W-21-2487-W4	686.0	688.0	2.0	94.1	27.2	LX4_3414	Lynx 4
including	686.7	687.0	0.3	546	100
OSK-W-21-2492-W3	803.4	805.5	2.1	8.19		LX4_3414	Lynx 4
including	804.0	804.5	0.5	18.4
	864.0	866.0	2.0	10.1		LX4_3437	Lynx 4
OSK-W-21-2495-W1	1038.0	1045.1	7.1	34.1	33.5	LX4_3430	Lynx 4
including	1040.0	1041.0	1.0	105	100
OSK-W-21-2503	1008.0	1013.0	5.0	6.59		TLX_3163	Triple Lynx
	1087.0	1089.0	2.0	3.53		TLX_3162	Triple Lynx
including	1088.3	1088.6	0.3	12.6
	1113.0	1117.0	4.0	36.0	22.4	TLX_3172	Triple Lynx
including	1115.1	1115.8	0.7	178	100
	1120.0	1122.1	2.1	11.5		TLX_3172	Triple Lynx
including	1120.3	1120.6	0.3	72.8
OSK-W-21-2522	735.0	737.0	2.0	4.54		LXM_3345	Lynx
WST-21-0650	232.5	236.1	3.6	9.91		LXSW_3507	Lynx
including	232.5	233.0	0.5	51.3
WST-21-0684	267.9	269.9	2.0	6.55		LXSW_3556	Lynx
including	268.6	269.0	0.4	32.0
WST-21-0725	262.4	264.5	2.1	7.65		TLX_3185	Triple Lynx
WST-21-0727A	334.1	336.1	2.0	15.0		TLX_3163	Triple Lynx
including	334.1	334.7	0.6	44.7
WST-21-0734A	323.7	325.9	2.2	6.99		LXSW_3556	Lynx
including	325.2	325.9	0.7	21.1
WST-21-0736	202.0	204.0	2.0	14.0		LXSW_3507	Lynx
including	202.0	202.7	0.7	35.1
	297.0	299.6	2.6	13.4		LXSW_3556	Lynx
including	297.0	297.9	0.9	31.6
	354.0	356.2	2.2	12.7		LXSW_3502	Lynx
including	355.3	355.6	0.3	33.9
WST-21-0768	365.0	367.0	2.0	17.0		LXSW_3502	Lynx
including	366.1	366.7	0.6	56.2
WST-21-0769	79.1	81.3	2.2	10.3		LXM_3311	Lynx
including	79.1	79.9	0.8	27.0
WST-21-0774	479.6	482.0	2.4	12.1		LX4_3450	Lynx 4
including	480.3	481.1	0.8	35.5
WST-21-0782	169.3	172.0	2.7	20.6		LXM_3304	Lynx
including	169.3	170.2	0.9	49.1
WST-21-0787	129.4	133.0	3.6	5.66		LXM_3334	Lynx
WST-21-0790	95.0	97.3	2.3	5.00		LXM_3339	Lynx
including	96.0	96.7	0.7	12.3
	105.0	107.0	2.0	10.7		LXM_3339	Lynx
including	105.4	106.0	0.6	24.3

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below. LXM = Lynx Main, LX4 = Lynx 4, TLX = Triple Lynx, and LXSW = Lynx Southwest.

Expansion Drilling

Hole Number	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t)         cut to 100 g/t	Zone	Corridor
OSK-W-21-2275-W5	1053.0	1057.1	4.1	17.2		Triple Lynx	Triple Lynx
including	1053.5	1053.8	0.3	37.2
and	1056.3	1057.1	0.8	72.5
OSK-W-21-2391-W3	1251.0	1253.1	2.1	3.64		Triple Lynx	Triple Lynx
OSK-W-21-2391-W4	1404.5	1406.5	2.0	6.39		Triple Lynx	Triple Lynx
including	1404.5	1404.8	0.3	36.2
	1409.0	1412.2	3.2	6.03		Triple Lynx	Triple Lynx
including	1409.0	1409.9	0.9	18.0
	1417.0	1419.0	2.0	3.90		Triple Lynx	Triple Lynx
including	1417.6	1418.1	0.5	12.5
OSK-W-21-2465-W2	763.7	766.2	2.5	41.0	39.1	Triple Lynx	Triple Lynx
including	765.0	765.3	0.3	111	100
and	765.6	766.2	0.6	99.6	97.1
OSK-W-21-2470-W2	921.0	923.0	2.0	4.27		Triple Lynx	Triple Lynx
	925.4	928.6	3.2	6.01		Triple Lynx	Triple Lynx
including	925.4	925.9	0.5	18.5
	991.7	995.0	3.3	4.20		Triple Lynx	Triple Lynx
including	991.7	992.1	0.4	19.1
	1125.0	1127.0	2.0	7.82		Triple Lynx	Triple Lynx
including	1125.3	1125.6	0.3	29.8
OSK-W-21-2470-W3	975.7	977.7	2.0	8.24		Triple Lynx	Triple Lynx
OSK-W-21-2480-W2	678.8	682.0	3.2	7.66		Lynx	Lynx
OSK-W-21-2495-W1	604.0	606.1	2.1	4.18		Lynx	Lynx
including	605.3	605.7	0.4	15.4
	1157.9	1160.0	2.1	5.79		Lynx 4	Lynx
including	1158.5	1159.3	0.8	12.6
	1190.7	1193.0	2.3	4.83		Lynx 4	Lynx
including	1191.8	1192.2	0.4	26.8
WST-21-0661	171.0	173.0	2.0	5.37		Lynx SW	Lynx SW
including	171.9	172.4	0.5	21.4
WST-21-0663	191.0	193.0	2.0	5.65		Lynx SW	Lynx SW
including	191.0	191.4	0.4	27.4
WST-21-0681	419.0	421.9	2.9	10.4		Triple Lynx	Triple Lynx
	444.0	446.0	2.0	8.90		Triple Lynx	Triple Lynx
including	445.0	446.0	1.0	17.4
WST-21-0734A	192.0	194.0	2.0	4.76		Lynx SW	Lynx SW
WST-21-0736	247.0	249.0	2.0	11.6		Lynx SW	Lynx SW
WST-21-0767	268.0	270.2	2.2	4.67		Lynx SW	Lynx SW
including	268.6	269.3	0.7	12.1
WST-21-0768	263.0	265.2	2.2	18.2	14.3	Lynx SW	Lynx SW
including	264.1	264.4	0.3	129	100
	312.0	314.0	2.0	13.5		Lynx SW	Lynx SW
including	313.0	313.3	0.3	83.5
WST-21-0769	320.0	322.0	2.0	4.38		Lynx SW	Lynx SW
including	320.4	321.2	0.8	10.9
	329.3	331.3	2.0	17.1	15.6	LXSW_3502	Lynx SW
including	329.3	329.6	0.3	110	100
WST-21-0774	332.0	334.0	2.0	3.64		Triple Lynx	Triple Lynx
	677.5	683.0	5.5	16.4	11.0	Lynx 4	Lynx
including	677.5	677.8	0.3	198	100
WST-21-0777	311.0	313.0	2.0	3.59		Lynx SW	Lynx SW
WST-21-0781	227.8	229.8	2.0	23.5		Triple Lynx	Triple Lynx
including	229.2	229.5	0.3	99.6
WST-21-0782	151.0	153.0	2.0	4.26		Lynx	Lynx
including	151.3	151.6	0.3	27.2
WST-21-0783	170.5	172.5	2.0	12.4		Lynx	Lynx
including	170.5	170.8	0.3	68.0
WST-21-0803	157.0	159.4	2.4	23.1		Triple Lynx	Triple Lynx

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below. LXSW = Lynx Southwest, SW = Southwest.

 

 

Drill hole location

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Elevation	Section
OSK-W-21-2067-W7	123	-53	1166	453241	5435697	416	3750
OSK-W-21-2275-W5	127	-49	1242	452888	5435583	409	3400
OSK-W-21-2391-W3	117	-57	1566	453281	5435894	408	3900
OSK-W-21-2391-W4	117	-57	1212	453281	5435894	408	3900
OSK-W-21-2465-W2	123	-61	831	453397	5435557	413	3825
OSK-W-21-2470-W2	132	-59	1197	453304	5435639	415	3775
OSK-W-21-2470-W3	132	-59	1209	453304	5435639	415	3775
OSK-W-21-2478-W3	128	-54	1080	452997	5435607	425	3500
OSK-W-21-2478-W4	127	-53	744	452997	5435607	425	3500
OSK-W-21-2480-W2	121	-55	789	453412	5435633	412	3875
OSK-W-21-2480-W3	121	-55	810	453412	5435633	412	3875
OSK-W-21-2480-W4	121	-55	780	453412	5435633	412	3875
OSK-W-21-2487-W4	359	-73	768	454135	5435058	397	4225
OSK-W-21-2492-W3	122	-53	720	453687	5435676	401	4125
OSK-W-21-2495-W1	123	-54	1301	453426	5435565	410	3850
OSK-W-21-2503	126	-58	1080	453333	5435641	413	3800
OSK-W-21-2522	128	-54	450	453451	5435594	411	3900
WST-21-0650	139	-60	466	452954	5435003	253	3175
WST-21-0661	163	-34	253	452954	5435003	254	3175
WST-21-0663	164	-40	214	452954	5435003	253	3175
WST-21-0681	160	-43	721	453322	5435235	55	3600
WST-21-0684	150	-44	301	452955	5435003	253	3175
WST-21-0725	160	-67	391	453506	5435327	-7	3800
WST-21-0727A	146	-69	361	453507	5435327	-7	3800
WST-21-0734A	129	-56	360	452956	5435003	253	3175
WST-21-0736	146	-53	448	452955	5435003	253	3175
WST-21-0767	175	-55	354	453104	5435065	231	3325
WST-21-0768	169	-53	453	453104	5435065	231	3325
WST-21-0769	171	-49	396	453103	5435064	231	3325
WST-21-0774	148	-40	724	453373	5435296	-26	3675
WST-21-0777	144	-49	352	452954	5435003	253	3175
WST-21-0781	129	-59	283	453508	5435327	-7	3800
WST-21-0782	123	-36	207	453508	5435327	-7	3800
WST-21-0783	119	-28	201	453508	5435327	-6	3800
WST-21-0787	143	-46	517	453320	5435235	54	3600
WST-21-0790	171	-65	64	453104	5435065	231	3325
WST-21-0803	162	-44	364	453356	5435271	16	3650

 

Lynx Zone

Mineralization occurs as grey to translucent quartz-carbonate-pyrite-tourmaline veins and pyrite replacement zones and stockworks. Vein-type mineralization is associated with haloes of pervasive sericite-pyrite ± silica alteration and contain sulphides (predominantly pyrite with minor amounts of chalcopyrite, sphalerite, galena, arsenopyrite, and pyrrhotite) and local visible gold. Replacement mineralization is associated with strong pervasive silica-sericite-ankerite ± tourmaline alteration and contains disseminated pyrite from trace to 80% with local visible gold. Pyrite stockworks can form envelopes that reach several tens of metres thick. Fuchsite alteration is common and is spatially constrained to near the gabbros. Mineralization occurs at or near geological contacts between felsic porphyritic or fragmental intrusions and the host rhyolites or gabbros and locally can be hosted along the gabbro-rhyolite contact.

 

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), Director of Exploration for Osisko’s Windfall 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 estimated at 55-80% 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. NQ core assays 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, Vancouver, British Colombia, Lima, Peru or Vientiane, Laos (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 a Four Acid Digestion-ICP-MS 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 Gold Deposit

The Windfall gold deposit is located between Val-d’Or and Chibougamau in the Abitibi region of Québec, Canada. The Mineral Resource Estimate (“MRE“) defined by Osisko, as disclosed in the news release dated February 17, 2021 is supported by the technical report entitled “Preliminary Economic Assessment Update for the Windfall Project” dated April 26, 2021 (that includes Windfall Mineral Resource Estimate with an effective date  of November 30, 2020), and assuming a cut-off grade of 3.50 g/t Au, comprises 521,000 tonnes at 11.3 g/t Au (189,000 ounces) in the measured mineral resource category, 5,502,000 tonnes at 9.4 g/t Au (1,668,000 ounces) in the indicated mineral resource category and 16,401,000 tonnes at 8.0 g/t Au (4,244,000 ounces) in the inferred mineral resource category. The key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in the February 17, 2021 news release are further described in the full technical report prepared by BBA Inc. in accordance with NI 43-101 and is available on SEDAR (www.sedar.com) under the Corporation’s issuer profile. The Windfall gold deposit is currently one of the highest-grade resource-stage gold projects in Canada and has world-class scale. Mineralization occurs in three principal zones: Lynx, Main Zone, and Underdog. Mineralization is generally comprised of sub-vertical zones following intrusive porphyry contacts plunging to the northeast. The resources are defined from surface to a depth of 1,600 metres as it now includes the Triple 8 (T8) zone. The resources excluding T8 are defined from surface to a depth of 1,200 metres. The deposit remains open along strike and at depth. Mineralization has been identified at surface in some areas and as deep as 2,625 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 gold resource properties in Canada. Osisko holds a 100% interest 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 Quévillon area (over 2,700 square kilometres).

 

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”, “potential”, “feasibility”, “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 news release contains the forward-looking information pertaining to, among other things: the Windfall gold deposit being one of the highest-grade resource-stage gold projects in Canada and having world-class scale; the key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in this news release; the prospects, if any, of the Windfall gold deposit; timing and ability of Osisko to file a technical report for the mineral resource estimate disclosed in this news release; the timing and ability of Osisko, if at all, to publish a feasibility study for the Windfall gold deposit; the amount and type of drilling to be completed and the timing to complete such drilling; the focus of the remaining infill drilling; the trend of grade increase; the Lynx zone remaining open to expansion down plunge; upgrading a inferred mineral resource to a measured mineral resource or indicated mineral resource category; future drilling at the Windfall gold deposit; the significance of historic exploration activities and results. 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 (infill) drilling; property and royalty interests in the Windfall gold deposit; the ability of the Corporation to obtain required approvals; 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.

 

CONTACT INFORMATION:

John Burzynski
Chief Executive Officer
Telephone (416) 363-8653

Recon Drilling Returns High-Grade:  27.4 g/t Au Over 6.7 Metres

(Toronto, June 15, 2021) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to announce that a significant new high-grade gold discovery has been made north of its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

 

Reconnaissance drilling approximately one kilometre north of Windfall identified the discovery area (“Golden Bear”), located along a sub-parallel splay of the Windfall Bank Fault.

 

Osisko Mining Chief Executive Officer John Burzynski commented: “It’s early days, but it looks like we’ve found another new high-grade system near Windfall in an area with little drilling.  We are very excited by the Golden Bear discovery, particularly as this new mineralization is located less than a kilometre from the footprint of where we hope to build the Windfall mine and milling facility.  When Osisko discovered the Lynx deposit in 2016 it was a game-changer for the overall scale and grade of Windfall.  We believe that this new high-grade discovery may similarly have a significant positive effect on our development plans for the Windfall camp.  It certainly underscores the highly prospective nature of Osisko’s strategic land package surrounding Windfall, the vast majority of which has yet to see any drilling.”

 

Golden Bear is situated within a package of andesitic to dacitic rock intruded by felsic porphyries.  Mineralization in the discovery intersection consists of pyrrhotite ± pyrite-sphalerite-chalcopyrite with local visible gold in pervasive silica alteration and quartz-carbonate veins.  Drilling on Golden Bear is now focused on confirming the discovery, its orientation and the extent of the mineralization.  Additional drilling will include tight and wide step outs, and new results will be released as they are received.

Maps showing the drill hole location and full analytical results are available at www.osiskomining.com

Discovery Hole OSK-UB-21-232

Hole No.	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t)         cut to 100 g/t	Zone	Corridor
OSK-UB-21-232	503.0	509.7	6.7	27.4	17.2	New	Golden Bear
including	507.0	509.7	2.7	63.6	38.2

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below.

 

Discovery Hole Location

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Elevation	Section
OSK-UB-21-232	350	-50	552	453190	5436568	408	N.A.

 

Golden Bear Discovery

Mineralization is hosted in an altered andesite and occurs as pyrrhotite replacement in grey to translucent pervasive silica and quartz-carbonate-pyrrhotite veins. Replacement mineralization is associated with strong pervasive silica alteration and contains trace to 15% disseminated and clustered pyrrhotite with local visible gold and trace amounts of sphalerite-chalcopyrite. Vein-type mineralization is associated with a halo of pervasive sericite-chlorite ± ankerite alteration containing sulphides (predominantly pyrrhotite with trace sphalerite, chalcopyrite, pyrite, galena and arsenopyrite) and local visible gold.

 

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), Director of Exploration for Osisko’s Windfall 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 estimated at 55-80% 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. NQ core assays 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, Vancouver, British Colombia, Lima, Peru or Vientiane, Laos (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 a Four Acid Digestion-ICP-MS 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 Gold Deposit

The Windfall gold deposit is located between Val-d’Or and Chibougamau in the Abitibi region of Québec, Canada. The Mineral Resource Estimate (“MRE”) defined by Osisko is supported by the technical report entitled “Preliminary Economic Assessment Update for the Windfall Project” dated April 26, 2021 (that includes Windfall Mineral Resource Estimate with an effective date  of November 30, 2020) (the “2021 Windfall PEA“), and assuming a cut-off grade of 3.50 g/t Au, comprises 521,000 tonnes at 11.3 g/t Au (189,000 ounces) in the measured mineral resource category, 5,502,000 tonnes at 9.4 g/t Au (1,668,000 ounces) in the indicated mineral resource category and 16,401,000 tonnes at 8.0 g/t Au (4,244,000 ounces) in the inferred mineral resource category. The key assumptions, parameters and methods used to estimate the MRE are further described in the 2021 Windfall PEA prepared by BBA Inc. in accordance with NI 43-101, which is available on SEDAR (www.sedar.com) under the Corporation’s issuer profile. The Windfall gold deposit is currently one of the highest-grade resource-stage gold projects in Canada and has world-class scale. Mineralization occurs in three principal zones: Lynx, Main Zone, and Underdog. Mineralization is generally comprised of sub-vertical zones following intrusive porphyry contacts plunging to the northeast. The resources are defined from surface to a depth of 1,600 metres as it now includes the Triple 8 (T8) zone. The resources excluding T8 are defined from surface to a depth of 1,200 metres. The deposit remains open along strike and at depth. Mineralization has been identified at surface in some areas and as deep as 2,625 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 gold resource properties in Canada. Osisko holds a 100% interest 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 Quévillon area (over 2,700 square kilometres).

 

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”, “potential”, “feasibility”, “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 news release contains the forward-looking information pertaining to, among other things: the significance of the new high-grade gold discovery; the prospects, if any, of Golden Bear; the mineralization of Golden Bear; the significance of drill results; the Windfall gold deposit being one of the highest-grade resource-stage gold projects in Canada and having world-class scale; the prospects, if any, of the Windfall gold deposit; the Lynx zone remaining open to expansion down plunge; upgrading a inferred mineral resource to a measured mineral resource or indicated mineral resource category; future drilling at the Windfall gold deposit; the significance of historic exploration activities and results. 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 (infill) drilling; property and royalty interests in the Windfall gold deposit; the ability of the Corporation to obtain required approvals; 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.

 

CONTACT INFORMATION:

John Burzynski
Chief Executive Officer
Telephone (416) 363-8653

 

248 g/t Au Over 2.2 Metres

164 g/t Au over 2.2 Metres

(Toronto, June 8, 2021) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide new analytical results from the ongoing drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

Significant new analytical results presented below include 34 intercepts in 15 underground drill holes and 8 wedges. The infill intercepts are located inside defined February 2021 mineral resource estimate (“MRE”) blocks (see Osisko news release dated February 17, 2021).

Osisko Chief Executive Officer John Burzynski commented: “Infill drilling in Lynx consistently delivers evenly distributed high-grade throughout the Lynx zones. Top results released today are all greater than an ounce per ton over two metres.”

Selected high-grade intercepts include: 248 g/t Au over 2.2 metres in WST-21-0750; 164 g/t Au over 2.2 metres in OSK-W-21-2492-W1, 128 g/t Au over 2.3 metres in OSK-W-21-2067-W6, 56.5 g/t Au over 2.9 metres in WST-21-0655 and 46.8 g/t Au over 2.6 metres in WST-21-0727A. Maps showing hole locations and full analytical results are available at www.osiskomining.com

Infill Drilling

Hole No.	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t)         cut to 100 g/t	Zone	Corridor
OSK-W-21-2067-W6	1078.7	1080.8	2.1	4.77		TLX_3162	Triple Lynx
	1095.7	1098.0	2.3	128	19.0	TLX_3170	Triple Lynx
including	1095.7	1096.1	0.4	725	100
OSK-W-21-2275-W5	909.0	911.0	2.0	24.7		TLX_3129	Triple Lynx
including	910.0	911.0	1.0	47.6
	918.0	920.0	2.0	36.9	21.5	TLX_3129	Triple Lynx
including	918.9	919.3	0.4	177	100
OSK-W-21-2478-W1	583.0	588.0	5.0	4.10		TLX_3178	Triple Lynx
including	587.0	588.0	1.0	13.1
OSK-W-21-2478-W3	901.0	903.0	2.0	9.94		TLX_3161	Triple Lynx
including	902.0	903.0	1.0	19.8
OSK-W-21-2487-W3	674.3	676.3	2.0	19.8		LX4_3414	Lynx 4
OSK-W-21-2492-W1	771.0	773.2	2.2	164	18.4	LX4_3414	Lynx 4
including	771.8	772.2	0.4	902	100
OSK-W-21-2492-W2	759.0	762.0	3.0	4.22		LX4_3424	Lynx 4
including	761.2	762.0	0.8	14.7
	794.0	796.0	2.0	4.40		LX4_3414	Lynx 4
OSK-W-21-2495-W1	668.0	670.0	2.0	28.0		LXM_3304	Lynx
including	669.6	670.0	0.4	60.5
	675.3	678.0	2.7	34.4		LXM_3304	Lynx
including	675.3	676.2	0.9	89.7
WST-21-0653A	362.0	364.2	2.2	12.8		LXSW_3556	Lynx
including	362.4	363.2	0.8	33.3
WST-21-0655	299.0	301.9	2.9	56.5	32.1	Lynx SW	Lynx SW
including	301.0	301.9	0.9	179	100
WST-21-0664	85.2	88.0	2.8	34.7	25.2	LXM_3307	Lynx
including	85.2	85.9	0.7	138	100
	477.8	479.9	2.1	11.0		LX4_3450	Lynx 4
including	479.1	479.9	0.8	24.8
WST-21-0681	290.0	292.0	2.0	4.71		TLX_3131	Triple Lynx
including	291.4	292.0	0.6	15.0
	321.0	323.0	2.0	6.38		TLX_3167	Triple Lynx
including	321.4	321.8	0.4	31.5
	482.0	484.2	2.2	10.8		LX4_3450	Lynx 4
WST-21-0705A	243.3	245.3	2.0	4.56		LXSW_3500	Lynx SW
including	244.6	245.3	0.7	13.0
WST-21-0718	25.9	28.0	2.1	15.0		LXM_3303	Lynx
including	26.7	27.3	0.6	47.4
	88.7	90.7	2.0	26.7		LXM_3304	Lynx
including	88.7	89.4	0.7	69.0
WST-21-0719	88.7	90.7	2.0	17.0		LXM_3304	Lynx
including	89.3	90.0	0.7	48.2
WST-21-0727A	260.1	262.7	2.6	46.8	22.0	TLX_3161	Triple Lynx
including	261.2	261.7	0.5	229	100
WST-21-0750	232.6	234.8	2.2	248	55.6	TLX_3161	Triple Lynx
including	233.8	234.3	0.5	740	100
WST-21-0755	318.0	320.0	2.0	4.92		TLX_3131	Triple Lynx
including	319.2	320.0	0.7	12.0
WST-21-0757	200.5	202.7	2.2	21.9		LXSW_3506	Lynx
including	201.0	201.3	0.3	75.2
	255.0	257.0	2.0	11.3		TLX_3131	Triple Lynx
including	256.3	257.0	0.7	31.8
	272.6	275.0	2.4	4.69		TLX_3166	Triple Lynx
	357.0	359.5	2.5	34.8	19.4	TLX_3165	Triple Lynx
including	358.3	358.7	0.4	197	100
WST-21-0762	98.3	100.4	2.1	4.54		LXM_3311	Lynx
including	98.7	99.4	0.7	11.6
WST-21-0768	281.0	283.0	2.0	12.8		LXSW_3556	Lynx
including	281.3	281.6	0.3	77.7
WST-21-0769	268.0	270.0	2.0	8.16		LXSW_3556	Lynx SW
including	268.7	269.6	0.9	17.9
WST-21-0787	489.0	491.1	2.1	10.3		LX4_3450	Lynx 4
including	490.3	490.7	0.4	53.4

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See “Quality Control and Reporting Protocols” below. LXM = Lynx Main, LX4 = Lynx 4, TLX = Triple Lynx, and LXSW = Lynx Southwest.

.

 

Drill hole location

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Elevation	Section
OSK-W-21-2067-W6	123	-53	1281	453241	5435697	416	3750
OSK-W-21-2275-W5	127	-49	1242	452888	5435583	409	3400
OSK-W-21-2478-W1	128	-54	764	452997	5435607	425	3500
OSK-W-21-2478-W3	128	-54	1080	452997	5435607	425	3500
OSK-W-21-2487-W3	359	-73	762	454135	5435058	397	4225
OSK-W-21-2492-W1	122	-53	843	453687	5435676	401	4125
OSK-W-21-2492-W2	122	-53	879	453687	5435676	401	4125
OSK-W-21-2495-W1	123	-54	1301	453426	5435565	410	3850
WST-21-0653A	155	-65	427	453104	5435065	231	3325
WST-21-0655	162	-63	402	453104	5435065	231	3325
WST-21-0664	140	-51	760	453229	5435127	134	3475
WST-21-0681	160	-43	721	453322	5435235	55	3600
WST-21-0705A	161	-57	351	453104	5435065	231	3325
WST-21-0718	162	0	100	453359	5435195	84	3625
WST-21-0719	163	-4	100	453359	5435194	83	3625
WST-21-0727A	146	-69	361	453507	5435327	-7	3800
WST-21-0750	124	-54	280	453357	5435273	15	3650
WST-21-0755	158	-48	358	453356	5435272	15	3650
WST-21-0757	145	-50	706	453228	5435126	135	3475
WST-21-0762	136	-60	381	453105	5435065	231	3325
WST-21-0768	169	-53	453	453104	5435065	231	3325
WST-21-0769	171	-49	396	453103	5435064	231	3325
WST-21-0787	143	-46	517	453320	5435235	54	3600

 

Lynx Zone

Mineralization occurs as grey to translucent quartz-carbonate-pyrite-tourmaline veins and pyrite replacement zones and stockworks. Vein-type mineralization is associated with haloes of pervasive sericite-pyrite ± silica alteration and contain sulphides (predominantly pyrite with minor amounts of chalcopyrite, sphalerite, galena, arsenopyrite, and pyrrhotite) and local visible gold. Replacement mineralization is associated with strong pervasive silica-sericite-ankerite ± tourmaline alteration and contains disseminated pyrite from trace to 80% with local visible gold. Pyrite stockworks can form envelopes that reach several tens of metres thick. Fuchsite alteration is common and is spatially constrained to near the gabbros. Mineralization occurs at or near geological contacts between felsic porphyritic or fragmental intrusions and the host rhyolites or gabbros and locally can be hosted along the gabbro-rhyolite contact.

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), Director of Exploration for Osisko’s Windfall 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 estimated at 55-80% 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. NQ core assays 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, Vancouver, British Colombia, Lima, Peru or Vientiane, Laos (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 a Four Acid Digestion-ICP-MS 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 Gold Deposit

The Windfall gold deposit is located between Val-d’Or and Chibougamau in the Abitibi region of Québec, Canada. The Mineral Resource Estimate (“MRE“) defined by Osisko, as disclosed in the news release dated February 17, 2021 is supported by the technical report entitled “Preliminary Economic Assessment Update for the Windfall Project” dated April 26, 2021 (that includes Windfall Mineral Resource Estimate with an effective date  of November 30, 2020), and assuming a cut-off grade of 3.50 g/t Au, comprises 521,000 tonnes at 11.3 g/t Au (189,000 ounces) in the measured mineral resource category, 5,502,000 tonnes at 9.4 g/t Au (1,668,000 ounces) in the indicated mineral resource category and 16,401,000 tonnes at 8.0 g/t Au (4,244,000 ounces) in the inferred mineral resource category. The key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in the February 17, 2021 news release are further described in the full technical report prepared by BBA Inc. in accordance with NI 43-101 and is available on SEDAR (www.sedar.com) under the Corporation’s issuer profile. The Windfall gold deposit is currently one of the highest-grade resource-stage gold projects in Canada and has world-class scale. Mineralization occurs in three principal zones: Lynx, Main Zone, and Underdog. Mineralization is generally comprised of sub-vertical zones following intrusive porphyry contacts plunging to the northeast. The resources are defined from surface to a depth of 1,600 metres as it now includes the Triple 8 (T8) zone. The resources excluding T8 are defined from surface to a depth of 1,200 metres. The deposit remains open along strike and at depth. Mineralization has been identified at surface in some areas and as deep as 2,625 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 gold resource properties in Canada. Osisko holds a 100% interest 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 Quévillon area (over 2,700 square kilometres).

 

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”, “potential”, “feasibility”, “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 news release contains the forward-looking information pertaining to, among other things: the Windfall gold deposit being one of the highest-grade resource-stage gold projects in Canada and having world-class scale; the key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in this news release; the prospects, if any, of the Windfall gold deposit; timing and ability of Osisko to file a technical report for the mineral resource estimate disclosed in this news release; the timing and ability of Osisko, if at all, to publish a feasibility study for the Windfall gold deposit; the amount and type of drilling to be completed and the timing to complete such drilling; the focus of the remaining infill drilling; the trend of grade increase; the Lynx zone remaining open to expansion down plunge; upgrading a inferred mineral resource to a measured mineral resource or indicated mineral resource category; future drilling at the Windfall gold deposit; the significance of historic exploration activities and results. 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 (infill) drilling; property and royalty interests in the Windfall gold deposit; the ability of the Corporation to obtain required approvals; 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.

 

CONTACT INFORMATION:

John Burzynski
Chief Executive Officer
Telephone (416) 363-8653