OSISKO DRILLING AT WINDFALL RETURNS HIGH GRADE AT LYNX

Posted on April 27, 2021November 8, 2023 by lboivin

296 g/t Au Over 2.0 Metres in Lynx

(Toronto, April 27, 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 56 intercepts in 23 drill holes (7 from surface, 16 from underground) and 12 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 located in a defined zone or corridor but do not yet correlate to a specific wireframe.

Osisko Chief Executive Officer John Burzynski commented: “We are encouraged by the expansion drilling in the Lynx and Triple Lynx areas. Today’s 37 expansion intercepts in these corridors are a good indication of the continuing potential in these zones.”

Selected high-grade intercepts include: 296 g/t Au over 2.0 metres in OSK-W-21-2436-W3; 177 g/t Au over 2.1 metres in OSK-W-21-2436-W2, 54.2 g/t Au over 4.5 metres in WST-21-0675, 63.7 g/t Au over 2.0 metres in WST-21-0744, and 48.2 g/t Au over 2.0 metres in OSK-W-20-2426. 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-21-2436-W2	714.4	716.5	2.1	177	35.1	LX4_3414	Lynx 4
including	715.0	715.6	0.6	595	100	LX4_3414	Lynx 4
OSK-W-21-2436-W3	760.0	762.0	2.0	296	55.6	LX4_3414	Lynx 4
including	760.4	761.1	0.7	757	100	LX4_3414	Lynx 4
	867.0	869.0	2.0	14.6		LX4_3430	Lynx 4
including	868.0	869.0	1.0	29.1		LX4_3430	Lynx 4
OSK-W-21-2445-W3	601.6	605.1	3.5	3.68		TLX_3171	Triple Lynx
OSK-W-21-2480-W1	748.0	750.2	2.2	24.4		LXM_3304	Lynx
including	748.5	749.2	0.7	76.4		LXM_3304	Lynx
OSK-W-21-2482	636.0	638.6	2.6	3.98		TLX_3171	Triple Lynx
	664.9	667.0	2.1	4.11		TLX_3184	Triple Lynx
including	665.7	666.0	0.3	26.7		TLX_3184	Triple Lynx
WST-20-0617	351.7	358.0	6.3	7.44		TLX_3167	Triple Lynx
including	352.1	352.4	0.3	83.1		TLX_3167	Triple Lynx
WST-21-0683	342.8	344.8	2.0	3.83		TLX_3166	Triple Lynx
	371.0	374.8	3.8	8.72		TLX_3165	Triple Lynx
including	373.9	374.8	0.9	27.1		TLX_3165	Triple Lynx
WST-21-0691	250.0	254.0	4.0	6.29		TLX_3164	Triple Lynx
	257.2	259.6	2.4	13.8		TLX_3164	Triple Lynx
WST-21-0697	379.4	381.7	2.3	4.55		TLX_3166	Triple Lynx
	426.0	428.0	2.0	11.4		TLX_3165	Triple Lynx
including	426.5	427.4	0.9	23.5		TLX_3165	Triple Lynx
WST-21-0706	269.5	273.3	3.8	7.68		LXSW_3556	Lynx
including	269.8	270.3	0.5	23.7		LXSW_3556	Lynx
WST-21-0748	200.0	202.4	2.4	37.4		LXM_3304	Lynx
including	201.6	202.4	0.8	93.5		LXM_3304	Lynx
WST-21-0786	124.3	127.2	2.9	7.21		LXM_3334	Lynx

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 No.	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t) cut to 100 g/t	Zone	Corridor
OSK-W-20-2397-W1	818.9	821.0	2.1	4.32		Lynx	Lynx
OSK-W-20-2426	912.0	914.0	2.0	48.2	25.2	Triple Lynx	Triple Lynx
including	912.7	913.2	0.5	192	100	Triple Lynx	Triple Lynx
OSK-W-21-2369-W3	1215.9	1218.0	2.1	5.17		Lynx 4	Lynx
	1223.7	1226.1	2.4	15.5		Lynx 4	Lynx
OSK-W-21-2394-W4	908.0	910.0	2.0	3.85		Triple Lynx	Triple Lynx
OSK-W-21-2394-W6	580.0	582.0	2.0	3.58		Triple Lynx	Triple Lynx
including	580.0	580.9	0.9	7.90		Triple Lynx	Triple Lynx
OSK-W-21-2416-W1	841.3	844.0	2.7	4.69		Triple Lynx	Triple Lynx
including	841.3	841.9	0.6	10.8		Triple Lynx	Triple Lynx
OSK-W-21-2416-W2	1125.0	1127.0	2.0	9.52		Triple Lynx	Triple Lynx
including	1125.8	1126.6	0.8	21.0		Triple Lynx	Triple Lynx
OSK-W-21-2445	932.0	934.0	2.0	14.9		Triple Lynx	Triple Lynx
including	932.0	933.0	1.0	26.2		Triple Lynx	Triple Lynx
OSK-W-21-2445-W3	612.2	614.2	2.0	9.96		Triple Lynx	Triple Lynx
including	612.6	613.1	0.5	31.0		Triple Lynx	Triple Lynx
	694.8	697.0	2.2	5.72		Triple Lynx	Triple Lynx
OSK-W-21-2445-W4	602.0	604.0	2.0	5.09		Triple Lynx	Triple Lynx
including	602.5	602.9	0.4	23.8		Triple Lynx	Triple Lynx
OSK-W-21-2459	1088.3	1090.4	2.1	5.25		Triple Lynx	Triple Lynx
including	1088.3	1088.6	0.3	36.4		Triple Lynx	Triple Lynx
OSK-W-21-2465	903.0	905.0	2.0	19.9		Lynx 4	Lynx
including	903.9	904.7	0.8	49.0		Lynx 4	Lynx
OSK-W-21-2470-W1	1115.0	1117.0	2.0	5.67		Triple Lynx	Triple Lynx
	1160.0	1162.0	2.0	17.2	16.5	Triple Lynx	Triple Lynx
including	1160.8	1161.1	0.3	105	100	Triple Lynx	Triple Lynx
OSK-W-21-2473	992.4	994.4	2.0	6.94		Triple Lynx	Triple Lynx
including	993.7	994.4	0.7	19.5		Triple Lynx	Triple Lynx
	997.0	999.0	2.0	5.30		Triple Lynx	Triple Lynx
including	998.4	999.0	0.6	17.2		Triple Lynx	Triple Lynx
OSK-W-21-2480-W1	697.3	699.6	2.3	6.24		Lynx	Lynx
including	699.2	699.6	0.4	16.2		Lynx	Lynx
OSK-W-21-2482	642.5	644.6	2.1	3.64		Triple Lynx	Triple Lynx
	825.7	827.7	2.0	25.8		Triple Lynx	Triple Lynx
OSK-W-21-2493	1064.0	1066.1	2.1	17.3		Lynx 4	Lynx
including	1064.8	1065.4	0.6	49.5		Lynx 4	Lynx
WST-21-0657	402.0	404.2	2.2	24.6		Triple Lynx	Triple Lynx
including	402.0	402.5	0.5	94.0		Triple Lynx	Triple Lynx
WST-21-0665	394.0	397.0	3.0	10.5		TLX_3165	Triple Lynx
including	396.4	397.0	0.6	39.7		TLX_3165	Triple Lynx
WST-21-0675	271.5	276.0	4.5	54.2	25.8	Lynx HW	Lynx
including	274.0	275.0	1.0	228	100	Lynx HW	Lynx
WST-21-0676	123.0	125.3	2.3	4.73		Lynx	Lynx
including	124.5	125.3	0.8	10.2		Lynx	Lynx
	217.0	219.0	2.0	5.72		Lynx	Lynx
WST-21-0678	495.8	497.9	2.1	11.8		Triple Lynx	Triple Lynx
including	496.6	497.6	1.0	24.2		Triple Lynx	Triple Lynx
WST-21-0683	355.0	358.0	3.0	7.62		Triple Lynx	Triple Lynx
including	355.0	356.0	1.0	17.2		Triple Lynx	Triple Lynx
	544.0	546.0	2.0	5.55		Lynx 4	Lynx
WST-21-0690	242.5	244.6	2.1	13.0		Triple Lynx	Triple Lynx
including	243.3	243.6	0.3	49.2		Triple Lynx	Triple Lynx
	249.6	251.6	2.0	5.13		Triple Lynx	Triple Lynx
	252.6	254.7	2.1	4.67		Triple Lynx	Triple Lynx
including	254.3	254.7	0.4	10.2		Triple Lynx	Triple Lynx
WST-21-0703	309.5	311.7	2.2	5.38		Lynx SW	Lynx SW
WST-21-0706	250.7	253.0	2.3	5.17		Lynx SW	Lynx SW
WST-21-0744	115.2	117.2	2.0	63.7	20.1	Lynx	Lynx
including	115.8	116.2	0.4	318	100	Lynx	Lynx
	119.1	121.4	2.3	11.2		Lynx	Lynx
WST-21-0749	128.3	130.4	2.1	9.29		LXM_3338	Lynx
including	129.0	129.7	0.7	22.2		LXM_3338	Lynx
	144.9	146.9	2.0	37.1		Lynx	Lynx

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

Drill hole location

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Elevation	Section
OSK-W-20-2397-W1	131	-58	1200	453451	5435594	412	3900
OSK-W-20-2426	134	-56	1035	453008	5435388	413	3400
OSK-W-21-2369-W3	130	-56	1415	453424	5435566	410	3850
OSK-W-21-2394-W4	138	-52	920	452923	5435467	414	3375
OSK-W-21-2394-W6	138	-52	978	452923	5435467	414	3375
OSK-W-21-2416-W1	123	-54	1083	453169	5435624	412	3650
OSK-W-21-2416-W2	123	-54	1266	453169	5435624	412	3650
OSK-W-21-2436-W2	130	-57	789	453709	5435618	400	4125
OSK-W-21-2436-W3	130	-57	879	453709	5435618	400	4125
OSK-W-21-2445	141	-50	945	452906	5435434	415	3325
OSK-W-21-2445-W3	141	-50	753	452906	5435434	415	3325
OSK-W-21-2445-W4	141	-50	944	452906	5435434	415	3325
OSK-W-21-2459	132	-52	1227	452997	5435607	425	3500
OSK-W-21-2465	123	-61	1253	453397	5435557	413	3825
OSK-W-21-2470-W1	132	-59	1227	453304	5435639	415	3775
OSK-W-21-2473	123	-56	1272	453420	5435610	413	3875
OSK-W-21-2480-W1	121	-55	888	453412	5435633	412	3875
OSK-W-21-2482	131	-57	939	453008	5435388	413	3400
OSK-W-21-2493	134	-54	1080	453008	5435388	412	3400
WST-20-0617	134	-41	366	453257	5435210	95	3525
WST-21-0657	141	-56	448	453357	5435272	16	3650
WST-21-0665	141	-52	552	453229	5435127	134	3475
WST-21-0675	133	-40	336	453508	5435327	-7	3800
WST-21-0676	129	-32	318	453508	5435327	-7	3800
WST-21-0678	153	-50	574	453321	5435235	55	3600
WST-21-0683	146	-40	636	453257	5435210	95	3525
WST-21-0690	150	-63	307	453356	5435272	16	3650
WST-21-0691	152	-58	385	453356	5435272	16	3650
WST-21-0697	136	-45	542	453257	5435209	96	3525
WST-21-0703	146	-60	489	453104	5435065	231	3325
WST-21-0706	165	-54	417	453104	5435065	231	3325
WST-21-0744	136	-27	186	453508	5435327	-6	3800
WST-21-0748	125	-54	267	453508	5435327	-7	3800
WST-21-0749	136	-30	196	453357	5435272	16	3650
WST-21-0786	150	-39	140	453322	5435235	55	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 defined by Osisko, as disclosed in the news release dated February 17, 2021 and supported by the technical report entitled “Mineral Resource Estimate Update for the Windfall Project, Eeyou Istchee James Bay, Québec, Canada” dated March 8, 2021 (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

OSISKO FILES PEA UPDATE TECHNICAL REPORT FOR WINDFALL PROJECT

Posted on April 26, 2021November 8, 2023 by lboivin

(Toronto, April 26, 2021) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to announce the filing of an independent Preliminary Economic Assessment technical report which has been prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects, on its 100% owned Windfall gold project, located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

The technical report, entitled “Preliminary Economic Assessment Update for the Windfall Project” (the “Windfall PEA”) and dated April 23, 2021 (effective date of April 6, 2021), has been prepared for Osisko by BBA Inc. with the assistance of a number of specialized consultants, including Andrieux & Associates Geomechanics Consulting LP, Entech Mining Ltd., GCM Consultants, Golder Associates Ltd., and WSP Canada Inc. The Windfall PEA is available on SEDAR (www.sedar.com) under Osisko’s issuer profile.

Osisko’s news release dated April 7, 2021 (entitled “Osisko Mining Delivers Positive PEA Update for Windfall”) 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 April 7, 2021.

About Osisko Mining Inc.

Cautionary Note 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 categorized 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 additional information:

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

OSISKO INFILL DRILLING RETURNS HIGH GRADE AT LYNX

Posted on April 20, 2021November 8, 2023 by lboivin

106 g/t Au Over 2.4 Metres

(Toronto, April 20, 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 41 intercepts in 17 drill holes (4 from surface, 13 from underground) and 6 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 and Triple Lynx continues to nicely intersect the inferred blocks from the February 2021 MRE, as expected, and increase our confidence in converting those blocks into the indicated or measured categories. We are currently drilling over 5,000 metres a week at Windfall, on target to complete the infill program by this fall.”

Selected high-grade intercepts include: 106 g/t Au over 2.4 metres in WST-21-0746; 90.4 g/t Au over 2.1 metres in OSK-W-21-2416-W3; 28.3 g/t Au over 4.9 metres in WST-21-0690, 60.9 g/t Au over 2.2 metres in OSK-W-21-2452, and 63.5 g/t Au over 2.0 metres in OSK-W-21-2416-W1. 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-20-2363-W3	659.2	662.0	2.8	3.76		TLX_3178	Triple Lynx
OSK-W-21-2252-W12	916.0	918.0	2.0	15.4		TLX_3161	Triple Lynx
	921.0	923.4	2.4	7.13		TLX_3161	Triple Lynx
including	921.0	921.4	0.4	27.6		TLX_3161	Triple Lynx
	932.4	937.0	4.6	6.60		TLX_3161	Triple Lynx
including	932.4	932.8	0.4	17.3
and	936.0	937.0	1.0	15.9
	971.0	974.0	3.0	12.2		TLX_3163	Triple Lynx
including	973.3	974.0	0.7	39.0		TLX_3163	Triple Lynx
	998.0	1000.0	2.0	3.91		TLX_3163	Triple Lynx
	1024.9	1027.2	2.3	29.2	13.4	TLX_3164	Triple Lynx
including	1024.9	1025.2	0.3	221	100	TLX_3164	Triple Lynx
OSK-W-21-2394-W4	874.8	877.0	2.2	14.3		TLX_3130	Triple Lynx
including	874.8	875.1	0.3	30.0		TLX_3130	Triple Lynx
OSK-W-21-2416-W1	910.0	912.0	2.0	5.18		TLX_3161	Triple Lynx
	969.1	971.1	2.0	6.02		TLX_3164	Triple Lynx
including	970.7	971.1	0.4	28.9		TLX_3164	Triple Lynx
	974.0	976.0	2.0	63.5	25.5	TLX_3164	Triple Lynx
including	975.5	976.0	0.5	252	100	TLX_3164	Triple Lynx
OSK-W-21-2416-W2	965.4	967.4	2.0	8.32		TLX_3163	Triple Lynx
including	965.4	966.5	1.1	14.7		TLX_3163	Triple Lynx
	976.0	978.0	2.0	6.19		TLX_3163	Triple Lynx
	982.8	985.0	2.2	10.3		TLX_3164	Triple Lynx
	1006.1	1009.2	3.1	10.4		TLX_3164	Triple Lynx
including	1008.7	1009.2	0.5	46.9		TLX_3164	Triple Lynx
	1050.0	1053.0	3.0	9.79		TLX_3170	Triple Lynx
including	1052.0	1053.0	1.0	17.0		TLX_3170	Triple Lynx
OSK-W-21-2416-W3	924.5	926.6	2.1	7.06		TLX_3161	Triple Lynx
	934.5	938.4	3.9	8.78		TLX_3161	Triple Lynx
	1024.0	1029.0	5.0	11.2		TLX_3162	Triple Lynx
including	1024.0	1024.3	0.3	57.9
and	1026.0	1027.0	1.0	28.0
	1047.8	1049.9	2.1	90.4	36.3	TLX_3170	Triple Lynx
including	1047.8	1048.2	0.4	384	100	TLX_3170	Triple Lynx
	1069.0	1071.5	2.5	4.82		TLX_3172	Triple Lynx
including	1070.8	1071.5	0.7	11.2		TLX_3172	Triple Lynx
	1080.0	1082.0	2.0	36.4		TLX_3172	Triple Lynx
OSK-W-21-2452	829.7	831.9	2.2	60.9	30.6	TLX_3195	Triple Lynx
including	831.0	831.6	0.6	211	100	TLX_3195	Triple Lynx
OSK-W-21-2459	883.4	885.6	2.2	5.68		TLX_3184	Triple Lynx
including	883.4	884.1	0.7	13.8		TLX_3184	Triple Lynx
OSK-W-21-2493	559.2	561.5	2.3	19.8		TLX_3184	Triple Lynx
including	560.8	561.1	0.3	72.6		TLX_3184	Triple Lynx
OSK-W-21-2495	633.3	635.8	2.5	3.99		LXM_3304	Lynx
including	633.3	633.8	0.5	18.2		LXM_3304	Lynx
WST-20-0481	111.5	113.5	2.0	12.3		LXM_3304	Lynx
including	113.0	113.5	0.5	45.1		LXM_3304	Lynx
	115.0	117.0	2.0	5.29		LXM_3304	Lynx
including	116.6	117.0	0.4	10.8		LXM_3304	Lynx
WST-20-0605A	265.0	267.3	2.3	28.6		LXSW_3500	Lynx SW
including	266.4	267.0	0.6	86.9		LXSW_3500	Lynx SW
WST-21-0619A	214.0	216.0	2.0	20.0		TLX_3161	Triple Lynx
including	214.0	214.4	0.4	96.4		TLX_3161	Triple Lynx
WST-21-0674	168.7	171.1	2.4	26.9		LXM_3304	Lynx
including	169.1	169.6	0.5	94.1		LXM_3304	Lynx
WST-21-0689A	316.7	318.7	2.0	31.2	29.3	TLX_3169	Triple Lynx
including	317.6	317.9	0.3	89.0
and	318.4	318.7	0.3	113	100
WST-21-0690	231.0	235.9	4.9	28.3		TLX_3161	Triple Lynx
including	231.6	232.2	0.6	86.7
and	234.4	235.0	0.6	72.1
WST-21-0691	218.4	222.0	3.6	20.4		TLX_3161	Triple Lynx
including	219.4	220.0	0.6	65.4		TLX_3161	Triple Lynx
WST-21-0696	448.8	451.0	2.2	5.06		LX4_3450	Lynx 4
WST-21-0701	126.0	128.0	2.0	27.9		LXM_3304	Lynx
including	126.5	127.3	0.8	69.8		LXM_3304	Lynx
	142.5	144.8	2.3	17.3		LXM_3359	Lynx
including	143.5	144.5	1.0	39.5		LXM_3359	Lynx
WST-21-0702	121.9	124.2	2.3	24.7		LXM_3304	Lynx
WST-21-0740	122.0	124.8	2.8	3.58		LXM_3304	Lynx
including	123.0	123.4	0.4	18.7		LXM_3304	Lynx
WST-21-0745	184.5	187.0	2.5	31.1		LXM_3304	Lynx
including	185.7	186.1	0.4	85.6		LXM_3304	Lynx
WST-21-0746	190.5	192.9	2.4	106	66.8	LXM_3304	Lynx
including	190.5	191.0	0.5	109	100
and	191.0	191.5	0.5	152	100
and	191.5	192.1	0.6	207	100

Drill hole location

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Elevation	Section
OSK-W-20-2363-W3	139	-52	1185	452930	5435548	419	3425
OSK-W-21-2252-W12	129	-54	1161	453241	5435694	415	3750
OSK-W-21-2394-W4	138	-52	920	452923	5435467	414	3375
OSK-W-21-2416-W1	123	-54	1083	453169	5435624	412	3650
OSK-W-21-2416-W2	123	-54	1266	453169	5435624	412	3650
OSK-W-21-2416-W3	123	-54	1128	453169	5435624	412	3650
OSK-W-21-2445-W3	141	-50	753	452906	5435434	415	3325
OSK-W-21-2452	137	-56	891	453008	5435388	412	3400
OSK-W-21-2459	132	-52	1227	452997	5435607	425	3500
OSK-W-21-2493	134	-54	1080	453008	5435388	412	3400
OSK-W-21-2495	123	-54	1257	453426	5435565	410	3850
WST-20-0481	154	1	179	453450	5435264	116	3725
WST-20-0605A	148	-61	532	453105	5435065	231	3325
WST-21-0619A	174	-61	249	453507	5435327	-7	3800
WST-21-0672	141	-44	327	453508	5435327	-7	3800
WST-21-0674	134	-46	261	453508	5435327	-7	3800
WST-21-0689A	161	-64	397	453356	5435272	16	3650
WST-21-0690	150	-63	307	453356	5435272	16	3650
WST-21-0691	152	-58	385	453356	5435272	16	3650
WST-21-0696	137	-49	492	453229	5435127	134	3475
WST-21-0701	148	-22	172	453356	5435272	17	3650
WST-21-0702	151	-14	166	453356	5435272	17	3650
WST-21-0740	168	-25	150	453507	5435326	-6	3800
WST-21-0745	130	-51	246	453508	5435327	-7	3800
WST-21-0746	117	-44	240	453508	5435327	7	3800

Lynx Zone

Qualified Person

Quality Control and Reporting Protocols

About the Windfall Gold Deposit

About Osisko Mining Inc.

Cautionary Note Regarding Forward-Looking Information

CONTACT INFORMATION:

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

OSISKO DRILLING AT WINDFALL RETURNS NEAR SURFACE HIGH GRADE

Posted on April 13, 2021November 8, 2023 by lboivin

877 g/t Au Over 2.2 Metres, 85.0 g/t Au Over 2.0 Metres in Bobcat

(Toronto, April 13, 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 43 intercepts in 18 drill holes (13 from surface, 5 from underground) and 6 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 mineral resource estimate (“MRE”) and either expand resource wireframes or are located in a defined zone or corridor but do not yet correlate to a specific wireframe.

Osisko Chief Executive Officer John Burzynski commented: “All zones at Windfall continue to expand and infill nicely with respect to the February 2021 MRE blocks, and continue to highlight the potential to increase the strong base case economics from the Windfall PEA, released last week.”

Selected high-grade intercepts include: 877 g/t Au over 2.2 metres and 85.0 g/t Au over 2.0 metres in WST-21-0668; 72.2 g/t Au over 2.0 metres in OSK-W-21-2442; 53.3 g/t Au over 2.3 metres in WST-21-0600; and 50.5 g/t Au over 2.4 metres in OSK-W-21-2442-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-20-2423	938.0	940.0	2.0	4.71		Underdog_4102	Underdog
including	939.5	940.0	0.5	16.6		Underdog_4102	Underdog
OSK-W-21-2442	627.0	629.0	2.0	17.4		Underdog_4100	Underdog
including	628.0	629.0	1.0	34.5		Underdog_4100	Underdog
	632.0	634.0	2.0	14.3		Underdog_4100	Underdog
including	632.4	633.0	0.6	36.7		Underdog_4100	Underdog
	642.0	644.0	2.0	24.7		Underdog_4100	Underdog
including	643.0	644.0	1.0	48.3		Underdog_4100	Underdog
	659.0	661.0	2.0	5.31		Underdog_4102	Underdog
including	659.0	659.5	0.5	12.9		Underdog_4102	Underdog
	667.0	669.0	2.0	72.2	57.5	Underdog_4102	Underdog
including	667.0	668.0	1.0	130	100	Underdog_4102	Underdog
	686.0	688.0	2.0	17.6		Underdog_4104	Underdog
including	686.0	687.0	1.0	34.3		Underdog_4104	Underdog
	826.0	828.0	2.0	35.9	30.0	Underdog_4905	Underdog
including	826.8	827.4	0.6	120	100	Underdog_4905	Underdog
OSK-W-21-2442-W1	696.0	698.0	2.0	3.48		Underdog_4104	Underdog
including	696.7	697.1	0.4	11.2		Underdog_4104	Underdog
	747.6	750.0	2.4	50.5	41.7	Underdog_4106	Underdog
including	749.0	750.0	1.0	121	100	Underdog_4106	Underdog
	762.6	764.8	2.2	5.02		Underdog_4107	Underdog
including	762.6	762.9	0.3	34.8		Underdog_4107	Underdog
	854.6	857.0	2.4	5.10		Underdog_4905	Underdog
OSK-W-21-2455	697.0	699.0	2.0	20.4		Caribou_2220	Caribou
including	698.0	699.0	1.0	40.5		Caribou_2220	Caribou
OSK-W-21-2463	629.0	631.0	2.0	7.21		Caribou_2206	Caribou
OSK-W-21-2483	521.0	526.5	5.5	3.94		Caribou_2210	Caribou
including	521.0	522.0	1.0	11.2		Caribou_2210	Caribou
	547.0	549.3	2.3	11.2		Caribou_2215	Caribou
including	548.4	549.0	0.6	29.4		Caribou_2215	Caribou
WST-21-0600	160.0	162.3	2.3	53.3		Bobcat_2350	Bobcat
including	160.0	161.0	1.0	86.3		Bobcat_2350	Bobcat
WST-21-0668	36.5	38.7	2.2	877	19.1	Bobcat_2350	Bobcat
including	36.5	36.9	0.4	4820	100	Bobcat_2350	Bobcat
WST-21-0669	74.0	76.0	2.0	11.5		Bobcat_2354	Bobcat

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

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-20-2374	102.3	104.4	2.1	3.16		Bobcat	Bobcat
including	103.9	104.4	0.5	7.98		Bobcat	Bobcat
OSK-W-20-2388	172.6	174.7	2.1	4.32		Caribou	Caribou
OSK-W-20-2399-W2	405.0	407.1	2.1	6.93		Caribou	Caribou
OSK-W-20-2405-W1	489.3	491.5	2.2	3.45		Caribou	Caribou
including	490.9	491.5	0.6	9.86		Caribou	Caribou
OSK-W-20-2410-W2	430.6	433.9	3.3	3.80		Caribou	Caribou
including	433.6	433.9	0.3	14.6		Caribou	Caribou
OSK-W-20-2415	467.0	469.0	2.0	4.57		Caribou	Caribou
OSK-W-20-2425	181.2	184.1	2.9	3.65		Caribou	Caribou
	190.1	192.2	2.1	6.18		Caribou	Caribou
OSK-W-20-2430	70.8	73.0	2.2	5.59		F11	F11
OSK-W-20-2433	116.0	118.2	2.2	5.85		F11	F11
OSK-W-21-2442	916.3	918.4	2.1	3.51		Underdog	Underdog
including	916.6	917.3	0.7	9.39		Underdog	Underdog
	934.0	937.3	3.3	7.33		Underdog_4501	Underdog
including	935.0	935.5	0.5	18.3		Underdog_4501	Underdog
OSK-W-21-2442-W1	661.2	664.0	2.8	3.57		Underdog	Underdog
	666.0	668.0	2.0	3.39		Underdog	Underdog
OSK-W-21-2460-W1	759.0	761.0	2.0	4.39		Z27	Zone 27
OSK-W-21-2462-W1	655.0	657.0	2.0	6.97		Caribou	Caribou
	682.0	684.0	2.0	4.37		Caribou	Caribou
OSK-W-21-2476	572.6	574.8	2.2	10.7		Caribou	Caribou
OSK-W-21-2490	712.0	714.0	2.0	4.35		Caribou	Caribou
	732.0	734.3	2.3	8.52		Caribou	Caribou
including	732.7	733.5	0.8	18.0		Caribou	Caribou
WST-20-0480B	138.1	140.8	2.7	25.3		Z27	Zone 27
including	139.0	140.0	1.0	53.5		Z27	Zone 27
WST-20-0559A	118.0	120.3	2.3	3.68		Bobcat	Bobcat
WST-21-0668	95.0	97.0	2.0	85.0	20.0	Bobcat	Bobcat
including	95.8	96.2	0.4	425	100	Bobcat	Bobcat
WST-21-0669	64.9	66.9	2.0	4.36		Bobcat	Bobcat

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

Drill hole location

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Elevation	Section
OSK-W-20-2374	340	-52	138	452720	5434747	397	2850
OSK-W-20-2388	326	-61	699	452715	5434606	397	2775
OSK-W-20-2399-W2	333	-54	876	452875	5434553	398	2875
OSK-W-20-2405-W1	332	-58	716	452694	5434440	401	2675
OSK-W-20-2410-W2	338	-62	774	452727	5434358	402	2650
OSK-W-20-2415	328	-54	755	452739	5434475	401	2725
OSK-W-20-2423	332	-60	1326	452616	5434449	403	2600
OSK-W-20-2425	336	-60	747	452715	5434606	397	2775
OSK-W-20-2430	150	-45	360	452601	5436048	404	3375
OSK-W-20-2433	148	-47	411	452559	5436072	405	3350
OSK-W-21-2442	347	-53	1053	452315	5434419	399	2325
OSK-W-21-2442-W1	347	-53	1011	452315	5434419	399	2325
OSK-W-21-2455	328	-53	780	452738	5434476	401	2725
OSK-W-21-2460-W1	332	-55	795	452732	5434536	399	2750
OSK-W-21-2462-W1	338	-57	855	452875	5434553	398	2875
OSK-W-21-2463	339	-65	1335	452616	5434449	403	2600
OSK-W-21-2476	337	-58	879	452840	5434569	398	2850
OSK-W-21-2483	328	-58	756	452731	5434634	397	2800
OSK-W-21-2490	338	-61	786	452756	5434465	401	2725
WST-20-0480B	143	-51	382	452281	5434975	262	2575
WST-20-0559A	143	3	145	452955	5435003	254	3175
WST-21-0600	97	-20	172	452819	5434944	274	3025
WST-21-0668	142	-20	148	452817	5434943	274	3025
WST-21-0669	140	-4	142	452817	5434944	274	3025

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-Zone

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.

Qualified Person

Quality Control and Reporting Protocols

About the Windfall Gold Deposit

About Osisko Mining Inc.

Cautionary Note Regarding Forward-Looking Information

CONTACT INFORMATION:

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

OSISKO DRILLING RETURNS HIGH GRADE AT LYNX

Posted on April 8, 2021November 8, 2023 by lboivin

369 g/t Au Over 3.5 Metres in Lynx

155 g/t Au Over 3.0 Metres in Triple Lynx

(Toronto, April 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 78 intercepts in 46 drill holes (12 from surface, 22 from underground) and 12 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 mineral resource estimate (“MRE”) and either expand resource wireframes or are located in a defined zone or corridor but do not yet correlate to a specific wireframe.

Osisko Chief Executive Officer John Burzynski commented: “Once again the drilling in the Lynx area delivers both inside and outside of the February 2021 MRE blocks. Further, expansion drilling in the Triple Lynx corridor continues to provide strong targets for growth as demonstrated by Hole OSK-W-20-2371-W1, one of our top results today. As we noted in our April 7, 2021 PEA update, ongoing drilling is showing great potential to see further increases in the already strong economic base case of the Windfall deposit.”

Selected high-grade intercepts include: 369 g/t Au over 3.5 metres in OSK-W-21-2369-W3; 155 g/t Au over 3.0 metres and 45.7 g/t Au over 2.1 metres in WST-21-0670; 129 g/t Au over 3.2 metres in OSK-W-20-2252-W11, 144 g/t Au over 2.5 metres in WST-21-0657; 123 g/t Au over 2.4 metres in OSK-W-20-2371-W1, 78.4 g/t Au over 3.1 metres in OSK-W-21-2480, 70.0 g/t Au over 2.6 metres in WST-20-0568, 76.4 g/t Au over 2.2 metres in WST-20-0578, and 52.6 g/t Au over 2.3 metres in OSK-W-20-2420. 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-20-2416	1019.1	1021.1	2.0	7.61		TLX_3162	Triple Lynx
including	1019.4	1020.0	0.6	21.6		TLX_3162	Triple Lynx
OSK-W-20-2426	346.0	348.0	2.0	5.84		TLX_3178	Triple Lynx
including	347.0	347.3	0.3	34.2		TLX_3178	Triple Lynx
OSK-W-20-2428	720.0	722.4	2.4	25.0		Lynx_3304	Lynx
including	721.1	721.9	0.8	61.0		Lynx_3304	Lynx
OSK-W-20-2431	759.0	761.0	2.0	3.86		TLX_3129	Triple Lynx
including	760.0	760.7	0.7	10.9		TLX_3129	Triple Lynx
	806.0	808.1	2.1	6.53		TLX_3195	Triple Lynx
including	807.6	808.1	0.5	25.9		TLX_3195	Triple Lynx
OSK-W-21-2363-W4	748.2	750.8	2.6	16.3		TLX_3171	Triple Lynx
including	750.0	750.5	0.5	33.7		TLX_3171	Triple Lynx
OSK-W-21-2369-W3	672.8	676.3	3.5	369	100	LXM_3304	Lynx
Including	672.8	673.5	0.7	127	100
and	673.5	674.2	0.7	545	100
and	674.2	674.6	0.4	192	100
and	674.6	675.0	0.4	155	100
and	675.0	675.6	0.6	557	100
and	675.6	676.3	0.7	500	100
OSK-W-21-2394-W4	668.7	671.0	2.3	40.9		TLX_3184	Triple Lynx
including	669.1	670.0	0.9	99.7		TLX_3184	Triple Lynx
	882.0	884.0	2.0	3.11		TLX_3130	Triple Lynx
OSK-W-21-2394-W5	652.5	655.4	2.9	3.86		TLX_3171	Triple Lynx
including	654.5	655.4	0.9	7.79		TLX_3171	Triple Lynx
OSK-W-21-2416-W2	927.5	929.7	2.2	7.16		TLX_3161	Triple Lynx
including	928.2	928.8	0.6	22.5		TLX_3161	Triple Lynx
	936.9	944.0	7.1	5.15		TLX_3161	Triple Lynx
including	937.5	938.2	0.7	15.8		TLX_3161	Triple Lynx
OSK-W-21-2436-W1	698.2	703.0	4.8	4.28		LX4_3424	Lynx 4
including	698.2	699.0	0.8	11.2		LX4_3424	Lynx 4
OSK-W-21-2443	1062.9	1065.0	2.1	6.51		Triple Lynx	Triple Lynx
including	1064.3	1065.0	0.7	16.6		Triple Lynx	Triple Lynx
OSK-W-21-2452	714.0	716.6	2.6	13.5		TLX_3198	Triple Lynx
	747.0	749.2	2.2	4.46		TLX_3129	Triple Lynx
including	747.0	747.7	0.7	10.2		TLX_3129	Triple Lynx
OSK-W-21-2457	773.7	776.0	2.3	33.4	18.6	Lynx_3437	Lynx
including	774.8	775.2	0.4	185	100	Lynx_3437	Lynx
OSK-W-21-2464	720.8	731.5	10.7	7.23		Lynx_3304	Lynx
including	725.8	726.8	1.0	17.2		Lynx_3304	Lynx
OSK-W-21-2480	741.4	744.5	3.1	78.4	31.5	LXM_3304	Lynx
including	742.8	743.5	0.7	308	100	LXM_3304	Lynx
WST-20-0573	336.1	338.3	2.2	4.76		LXSW_3556	Lynx
including	336.1	336.8	0.7	12.3		LXSW_3556	Lynx
WST-20-0605A	461.0	463.0	2.0	9.11		LXSW_3502	Lynx
including	461.7	462.3	0.6	30.2		LXSW_3502	Lynx
WST-21-0614	308.0	310.0	2.0	3.74		TLX_3169	Triple Lynx
	313.0	315.3	2.3	8.89		TLX_3169	Triple Lynx
including	314.9	315.3	0.4	17.8		TLX_3169	Triple Lynx
WST-21-0620A	274.0	276.0	2.0	4.97		TLX_3164	Triple Lynx
WST-21-0636	114.0	116.0	2.0	4.42		LXM_3334	Lynx
WST-21-0637	323.0	327.0	4.0	7.64		TLX_3167	Triple Lynx
including	326.0	327.0	1.0	15.4		TLX_3167	Triple Lynx
	475.5	478.0	2.5	3.47		Lynx 4	Lynx
	507.0	509.0	2.0	9.77		LX4_3450	Lynx 4
including	507.3	507.6	0.3	60.5		LX4_3450	Lynx 4
WST-21-0647	311.0	313.0	2.0	5.83		TLX_3166	Triple Lynx
including	312.3	313.0	0.7	14.9		TLX_3166	Triple Lynx
WST-21-0648B	59.0	61.4	2.4	4.28		Lynx_3339	Lynx
WST-21-0656	284.0	286.2	2.2	3.16		TLX_3164	Triple Lynx
WST-21-0657	219.5	222.0	2.5	144	55.3	TLX_3161	Triple Lynx
including	220.8	221.3	0.5	543	100	TLX_3161	Triple Lynx
WST-21-0659	360.9	364.0	3.1	6.83		TLX_3131	Triple Lynx
WST-21-0670	364.3	367.3	3.0	155	64.8	TLX_3166	Triple Lynx
including	364.3	365.3	1.0	369	100	TLX_3166	Triple Lynx
	369.3	371.4	2.1	45.7	23.8	TLX_3166	Triple Lynx
including	369.9	370.4	0.5	191	100	TLX_3166	Triple Lynx
	409.5	412.0	2.5	6.63		TLX_3165	Triple Lynx
including	410.0	410.4	0.4	30.6		TLX_3165	Triple Lynx
WST-21-0690	274.5	276.9	2.4	7.31		TLX_3164	Triple Lynx

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-20-2252-W11	944.0	946.0	2.0	4.53		Triple Lynx	Triple Lynx
	961.1	963.5	2.4	19.1	15.2	Triple Lynx	Triple Lynx
including	961.4	961.7	0.3	131	100	Triple Lynx	Triple Lynx
	965.8	969.0	3.2	129	21.2	Triple Lynx	Triple Lynx
including	967.8	968.1	0.3	1250	100	Triple Lynx	Triple Lynx
	975.0	977.0	2.0	4.58		Triple Lynx	Triple Lynx
OSK-W-20-2313-W10	1009.0	1011.0	2.0	3.49		Triple Lynx	Triple Lynx
	1052.0	1054.0	2.0	22.4		Triple Lynx	Triple Lynx
including	1052.0	1053.0	1.0	44.6		Triple Lynx	Triple Lynx
OSK-W-20-2363-W3	957.0	961.7	4.7	6.61		Triple Lynx	Triple Lynx
including	957.0	957.6	0.6	18.4		Triple Lynx	Triple Lynx
OSK-W-20-2371-W1	1007.3	1009.7	2.4	123	27.2	Triple Lynx	Triple Lynx
including	1007.3	1007.9	0.6	483	100	Triple Lynx	Triple Lynx
OSK-W-20-2397-W1	652.0	654.0	2.0	13.4		LXM_3304	Lynx
including	652.3	653.1	0.8	33.1		LXM_3304	Lynx
OSK-W-20-2416	946.0	948.0	2.0	7.01		Triple Lynx	Triple Lynx
	967.0	976.4	9.4	10.0		Triple Lynx	Triple Lynx
including	971.0	972.0	1.0	29.5		Triple Lynx	Triple Lynx
OSK-W-20-2420	744.0	746.3	2.3	52.6	51.3	Lynx	Lynx
including	744.5	745.5	1.0	103	100	Lynx	Lynx
	983.0	985.1	2.1	4.06		Triple Lynx	Triple Lynx
including	983.0	984.0	1.0	8.45		Triple Lynx	Triple Lynx
OSK-W-20-2426	634.0	636.0	2.0	17.6		Triple Lynx	Triple Lynx
including	635.0	636.0	1.0	32.4		Triple Lynx	Triple Lynx
	751.0	753.0	2.0	11.7		Triple Lynx	Triple Lynx
OSK-W-20-2428	665.0	667.3	2.3	19.3		Lynx	Lynx
including	665.0	666.3	1.3	34.1		Lynx	Lynx
	686.5	690.3	3.8	4.58		Lynx	Lynx
including	686.5	687.0	0.5	12.2		Lynx	Lynx
OSK-W-20-2431	759.0	761.0	2.0	3.86		Triple Lynx	Triple Lynx
including	760.0	760.7	0.7	10.9		Triple Lynx	Triple Lynx
	806.0	808.1	2.1	6.53		TLX_3195	Triple Lynx
including	807.6	808.1	0.5	25.9		TLX_3195	Triple Lynx
OSK-W-21-2363-W4	806.6	809.0	2.4	11.5		Triple Lynx	Triple Lynx
including	806.6	806.9	0.3	91.9		Triple Lynx	Triple Lynx
	812.5	816.0	3.5	15.5		Triple Lynx	Triple Lynx
including	812.5	813.4	0.9	33.9		Triple Lynx	Triple Lynx
OSK-W-21-2394-W5	600.0	602.0	2.0	6.49		Triple Lynx	Triple Lynx
OSK-W-21-2443	1062.9	1065.0	2.1	6.51		Triple Lynx	Triple Lynx
including	1064.3	1065.0	0.7	16.6		Triple Lynx	Triple Lynx
OSK-W-21-2445	590.4	593.0	2.6	3.28		Triple Lynx	Triple Lynx
including	590.4	590.8	0.4	19.7		Triple Lynx	Triple Lynx
	852.0	854.1	2.1	3.56		Triple Lynx	Triple Lynx
OSK-W-21-2445-W1	596.2	598.5	2.3	4.04		Triple Lynx	Triple Lynx
	618.0	620.0	2.0	3.69		Triple Lynx	Triple Lynx
including	618.0	619.0	1.0	7.22		Triple Lynx	Triple Lynx
OSK-W-21-2459	705.6	707.9	2.3	4.49		Triple Lynx	Triple Lynx
WST-20-0568	273.6	276.2	2.6	70.0	13.6	Lynx SW	Lynx SW
including	275.9	276.2	0.3	589	100	Lynx SW	Lynx SW
WST-20-0570	290.7	292.9	2.2	3.46		Lynx SW	Lynx SW
including	291.1	291.9	0.8	9.09		Lynx SW	Lynx SW
WST-20-0578	151.5	153.7	2.2	76.4	14.4	Lynx	Lynx
including	152.4	152.7	0.3	555	100	Lynx	Lynx
WST-20-0605A	258.0	260.0	2.0	3.58		Lynx SW	Lynx SW
including	258.0	259.0	1.0	7.12		Lynx SW	Lynx SW
WST-20-0613	376.0	385.0	9.0	7.47		Triple Lynx	Triple Lynx
including	380.4	380.8	0.4	16.5
and	381.1	382.0	0.9	27.6
and	383.4	384.0	0.6	15.5
	396.0	398.0	2.0	5.05		Triple Lynx	Triple Lynx
WST-20-0616	241.8	244.0	2.2	4.37		Lynx SW	Lynx SW
	377.9	380.0	2.1	8.67		Lynx SW	Lynx SW
including	377.9	378.4	0.5	36.2		Lynx SW	Lynx SW
WST-21-0637	172.0	174.0	2.0	5.30		Triple Lynx	Triple Lynx
including	172.0	172.5	0.5	18.1		Triple Lynx	Triple Lynx
WST-21-0662	212.0	214.0	2.0	12.7		Lynx SW	Lynx SW
including	212.5	213.0	0.5	34.1		Lynx SW	Lynx SW
WST-21-0678	48.0	50.0	2.0	4.30		Lynx	Lynx
including	48.0	48.5	0.5	11.7		Lynx	Lynx
WST-21-0689A	389.0	391.2	2.2	8.67		Triple Lynx	Triple Lynx
WST-21-0683	538.6	540.7	2.1	7.03		Lynx 4	Lynx

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

Drill hole location

Hole Number	Azimuth (°)	Dip (°)	Length (m)	UTM E	UTM N	Elevation	Section
OSK-W-20-2252-W11	129	-54	1191	453241	5435694	415	3750
OSK-W-20-2313-W10	134	-52	1059	452965	5435583	420	3450
OSK-W-20-2363-W3	139	-52	1185	452930	5435548	419	3425
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-20-2416	123	-54	1128	453169	5435624	412	3650
OSK-W-20-2420	124	-59	1185	453397	5435557	413	3825
OSK-W-20-2426	134	-56	1035	453008	5435388	413	3400
OSK-W-20-2428	127	-53	1257	453412	5435633	412	3875
OSK-W-20-2431	136	-57	849	453008	5435388	412	3400
OSK-W-21-2363-W4	139	-52	1270	452930	5435548	419	3425
OSK-W-21-2369-W3	130	-56	1415	453424	5435566	410	3850
OSK-W-21-2394-W4	138	-52	920	452923	5435467	414	3375
OSK-W-21-2394-W5	138	-52	915	452923	5435467	414	3375
OSK-W-21-2416-W2	123	-54	1266	453169	5435624	412	3650
OSK-W-21-2436-W1	130	-57	744	453709	5435618	400	4125
OSK-W-21-2443	127	-56	1164	453304	5435639	415	3775
OSK-W-21-2445	141	-50	945	452906	5435434	415	3325
OSK-W-21-2445-W1	141	-50	909	452906	5435434	415	3325
OSK-W-21-2452	137	-56	891	453008	5435388	412	3400
OSK-W-21-2457	15	-77	957	454135	5435058	397	4225
OSK-W-21-2459	132	-52	1227	452997	5435607	425	3500
OSK-W-21-2464	120	-53	1031	453412	5435633	412	3875
OSK-W-21-2480	121	-55	1230	453412	5435633	412	3875
WST-20-0568	157	-58	493	453104	5435065	231	3325
WST-20-0570	159	-51	454	453104	5435065	231	3325
WST-20-0573	148	-59	436	452955	5435003	253	3175
WST-20-0578	154	-47	802	453418	5435305	69	3725
WST-20-0605A	148	-61	532	453105	5435065	231	3325
WST-20-0613	123	-55	442	453358	5435273	16	3650
WST-20-0616	179	-61	459	453228	5435126	135	3475
WST-21-0614	131	-59	427	453357	5435273	16	3650
WST-21-0620A	174	-57	300	453507	5435327	-7	3800
WST-21-0636	133	-36	178	453322	5435235	55	3600
WST-21-0637	151	-47	550	453321	5435235	54	3600
WST-21-0647	150	-59	345	453228	5435126	135	3475
WST-21-0648B	166	-59	345	453228	5435126	135	3475
WST-21-0656	139	-61	322	453357	5435272	16	3650
WST-21-0657	141	-56	448	453357	5435272	16	3650
WST-21-0659	126	-45	397	453357	5435272	16	3650
WST-21-0662	149	-50	220	452955	5435003	253	3175
WST-21-0670	142	-43	471	453257	5435209	96	3525
WST-21-0678	153	-50	574	453321	5435235	55	3600
WST-21-0683	146	-40	636	453257	5435210	95	3525
WST-21-0689A	161	-64	397	453356	5435272	16	3650
WST-21-0690	150	-63	307	453356	5435272	16	3650

Lynx Zone

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

About the Windfall Gold Deposit

About Osisko Mining Inc.

Cautionary Note Regarding Forward-Looking Information

CONTACT INFORMATION:

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

OSISKO MINING DELIVERS POSITIVE PEA UPDATE FOR WINDFALL

Posted on April 7, 2021November 8, 2023 by lboivin

300,000 oz Au Average in First Seven Years of Full Production

39.3% After-Tax IRR and C$1.5 Billion After-Tax NPV at US$1,500/oz Au with 18 Year LOM

C$253 Million Average Annual After-Tax Free Cash Flow in First Seven Years of Full Production

(Toronto, April 7, 2021) Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to provide significant positive results from the independent Preliminary Economic Assessment (“PEA”) prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”) on its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

The PEA provides a robust base case assessment for developing the Windfall gold deposit as an underground dual ramp-access mine with a central processing mill at the site. The study includes drill results available as of November 30, 2020. Osisko is rapidly advancing surface and underground work at Windfall, with over 8.5 kilometres of underground exploration ramp, recently achieving 500 metres vertical depth (see Osisko news release dated March 25, 2021).

Highlights

First 7 years of full production: 300,000 oz Au per year average, 8.1 g/t Au average diluted grade

Peak recovery of 328,000 oz Au in year 6; average production over 18 year life of mine (“LOM”) of 238,000 oz Au per year (based on MRE database as of November 2020)*

50.6% Pre-Tax Internal Rate of Return (“IRR”), 39.3% After-Tax IRR; C$2.6 Billion Pre-Tax Net Present Value (“NPV”), C$1.5 Billion After-Tax NPV; After-Tax Payback Period 2.2 years from start of production

Average annual after-tax free cash flow of C$253 Million in the first seven years of full production (C$1.8 Billion cumulative), cumulative LOM after-tax free cash flow of C$2.6 Billion

AISC of US$610/oz Au

Capital expenditure (“Capex”) of C$544 Million (includes power line construction and C$55 Million as contingency in direct and indirect costs), NPV/Capex ratio of 2.7

PEA assumes 3,100 tonnes per day (“tpd”) milling operation

Average gold recovery of 94.8%; total operating cost of C$122/tonne

Windfall will generate over C$8.2 Billion of gross revenue and C$1.7 Billion in taxes

Creation of approximately 400 direct jobs and 200 indirect jobs during operation, over 500 jobs during construction

*Cautionary Statement – The reader is advised that the PEA summarized in this news 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 mineral resources. Inferred mineral resources are considered to be too speculative to be used in an economic analysis except as allowed for by NI 43-101 in PEA studies. There is no guarantee that inferred mineral resources can be converted to indicated or measured mineral resources, and as such, there is no guarantee the project economics described herein will be achieved.

Osisko Chief Executive Officer John Burzynski commented: “The sum of our work to date outlines the very strong base-case for a significant and highly profitable new gold mine in Québec . This PEA is an important interim update on the progress of our extensive work program at Windfall, with a robust 39% after-tax IRR and C$1.5 Billion after-tax NPV using US$1,500 oz gold. We believe this highly positive PEA is conservative. The eventual inclusion of high-grade infill results received since November 2020, and the results we anticipate as we complete the infill drilling for the Definitive Feasibility Study (“DFS”) by the early fall of 2021, should convert a significant number of additional high-grade mineral resource estimate (“MRE”) inferred ounces to the measured and indicated categories. In the next 12 months we are focused on completing drilling, the DFS, optimizing the capital program and operating plans, and securing project financing, as we advance our goal to move the project to first production in 2024.”

This independent study was prepared by BBA Inc. (Montreal) under the supervision of Mr. Don Njegovan, Chief Operating Officer of Osisko, Ms. Kim-Quyên Nguyên, P. Eng., MBA, Project Director for Osisko, the Osisko Group technical team, and included contributions from the geological and engineering teams at BBA Inc., Entech Mining Ltd. (Toronto), Andrieux & Associates Geomechanics Consulting LP (A2GC, Montreal), GCM Consultants (Montreal), Golder Associates Ltd. (Montreal) and WSP Canada Inc. (Val d’Or). These firms provided mineral resource estimates, design parameters and cost estimates for mine operations, process facilities, major equipment selection, waste and tailings storage, reclamation, permitting, and operating and capital expenditures. Table 5 details the contributors and their area of responsibility.

Table 1: PEA Summary (reported in C$, except where noted)

Total mineralized material mined (t)	19,699,688
Average stope diluted grade (Au g/t)	7.38
Average stockpile development diluted grade (Au g/t)	5.43
Average mill feed diluted grade (Au g/t)	6.95
Total gold contained (oz)	4,400,711
Total gold produced (oz)	4,174,870
Total gold payable (oz)	4,172,782
Gold payable recovery (%)	94.8%
Average annual gold produced (oz)	238,314
Total initial Capex (C$M) (less incurred camp and mill costs)	543.5
Sustaining capital (C$M)	761.5
Unit Operating Cost (per tonne milled)
Mining (C$)	57.29
Processing (C$)	26.85
Tailings & water management (C$)	9.91
General & administration (C$)	27.71
Total unit operating cost per tonne milled (C$)	121.76

Table 2: Summary Economics at US$1,500 gold per oz total

LOM Net Smelter Return Revenue (C$M)	8,150
Total LOM Pre-Tax Cash Flow (C$M)	4,286
Average Annual Pre-Tax Cash Flow (C$M)	245
LOM Income Taxes (C$M)	1,686.6
Total LOM After-Tax Free Cash Flow (C$M)	2,599.7
Average Annual After-Tax Free Cash Flow (C$M)	148
Discount Rate (%)	5.0
Pre-Tax NPV (C$M)	2,571
Pre-Tax IRR	50.6
Pre-Tax Payback after start of production (Years)	2.0
After-Tax NPV (C$M)	1,534
After-Tax IRR	39.3%
After-Tax Payback after start of production (Years)	2.2

Table 3: All-In Sustaining Cost

Mining Cost (C$M)	1,128.6
Processing Cost (C$M)	528.9
Tailing & Water Management (C$M)	195.3
General & Administrative (C$M)	545.8
Refining & Smelting (C$M)	28.1
Royalties (C$M)	163.0
Silver Credit ($M)	(41.5)
Adjusted Operating Costs	2,548.2
Sustaining (C$M)	666.4
Closure cost (C$M)	95.1
Total (C$M)	3,309.7
All-in Sustaining Cost (C$/oz)**	793.2
All-in Sustaining Cost (US$/oz)**	610.1

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

Table 4: Sensitivities (base case in bold)

Gold Price US$/oz	$1300	$1400	$1500	$1600	$1700	$1800	$1900	$2000
Pre-Tax NPV 5% (C$M)	1,906.0	2,238.6	2,571.3	2,903.9	3,236.5	3,569.2	3,901.8	4,234.4
After-Tax NPV 5% (C$M)	869.1	1,201.7	1,534.4	1,867.0	2,199.6	2,532.3	2,864.9	3,197.5
Pre-Tax IRR	41.1%	45.9%	50.6%	55.1%	59.5%	63.8%	68.0%	72.1%
After-Tax IRR	27.3%	33.6%	39.3%	44.8%	49.9%	54.9%	59.7%	64.3%
Pre-Tax Payback at production start (yrs)	2.4	2.2	2.0	1.8	1.7	1.6	1.5	1.4
After-Tax Payback at production start (yrs)	3.0	2.5	2.2	2.0	1.8	1.6	1.5	1.4

FX C$1:US$	0.90	0.85	0.80	0.77	0.70	0.65	0.60	0.55
Pre-Tax NPV 5% (C$M)	1,844.9	2,096.2	2,379.0	2,571.3	3,065.7	3,488.3	3,981.3	4,563.9
After-Tax NPV 5% (C$M)	808.0	1,059.3	1,342.1	1,534.4	2,028.8	2,451.4	2,944.4	3,527.1
Pre-Tax IRR	40.2%	43.9%	47.9%	50.6%	57.2%	62.7%	69.0%	76.1%
After-Tax IRR	26.1%	30.9%	36.0%	39.3%	47.3%	53.7%	60.8%	68.7%
Pre-Tax Payback at production start (yrs)	2.5	2.3	2.1	2.0	1.7	1.6	1.4	1.3
After-Tax Payback at production start (yrs)	3.1	2.7	2.4	2.2	1.9	1.6	1.5	1.3

Table 5: Consulting Firm and Area of Responsibility

Consulting Firm
A2GC	– Rock mass characterization and rock engineering in support of the underground mine design
BBA Inc.	– Historical data review; – Current and historical geology, exploration, drilling; – Sample preparation, QA/QC, and data verification; – Geological modelling and mineral resource estimate; – Metallurgical test work management and analysis, – Crusher and process plant mass and water balance, – Crusher and process plant design, capital costs and operating costs; – Electrical infrastructure design and costs (supply); – IT and communications infrastructure design and costs (supply and on-site); – Integrated Remote Operations Centre (IROC) design and costs; – General and administration operating costs; – Financial Analysis and overall NI 43-101 integration.
Entech Mining Ltd.	– 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; – Surface tailings management facility designs and costs; – Site wide water balance; – Hydrogeology and groundwater quality input to environmental studies; – Hydrogeology input to underground mine design;
WSP Canada Inc.	– Design and costs of surface infrastructure for Windfall site; – Site utilities design and costs; – Off-site access road to Windfall evaluation and costs; – On-site roads and pads design and costs; – Site Infrastructure electrical distribution design and costs; – Surface mineralized material, waste rock, overburden and topsoil management facility design and costs; – Surface water management infrastructure design and costs; – Tailings filtration plant and dry tailings storage / handling design and costs; – Underground paste backfill distribution and infrastructure design and costs; – Environmental studies, permitting and closure costs; – Regulatory context, social considerations, and anticipated environmental issues; – Geotechnical input for the surface infrastructure design.
GCM Consultants	– Water treatment plant design, capital and operating costs

Resource Estimate

The PEA is based on measured, indicated and inferred mineral resource estimates completed by Mr. Pierre-Luc Richard (P.Geo., M.Sc) of BBA Inc. (who is an independent qualified person for purposes of NI 43-101) for the Windfall deposit (Table 6). This mineral estimate uses a base cut-off of 3.5 g/t Au.

Table 6: Windfall Deposit Mineral Resource Estimate ⁽¹⁾

Area

Measured

Indicated

Inferred

Tonnes (t)

Grade Au (g/t)

Grade Ag (g/t)

Ounces Au (000 oz)

Ounces Ag (000 oz)

Tonnes (t)

Grade Au (g/t)

Grade Ag (g/t)

Ounces Au (000 oz)

Ounces Ag (000 oz)

Tonnes (t)

Grade Au (g/t)

Grade Ag (g/t)

Ounces Au (000 oz)

Ounces Ag (000 oz)

Lynx

521

11.3

8.1

189

135

3,075

11.0

6.6

1,088

655

7,418

9.9

3.5

2,355

833

Underdog

–

562

8.0

1.1

145

4,788

6.9

0.9

1,068

139

Main

–

1,865

7.3

5.7

436

339

3,540

5.9

3.3

673

375

Triple 8

–

655

7.1

4.7

149

Total

521

11.3

8.1

189

135

5,502

9.4

5.7

1,668

1,013

16,401

8.0

2.7

4,244

1,446

Resources estimate notes and resource modeling notes are shown below.

Table 7: Capital Cost Summary

Capital Costs (C$M)	Pre-Production	Sustaining	Total
Mining	75.2	575.4	650.5
Mineral Processing Plant	131.9	47.1	179.0
Mine Surface Facilities	12.6	4.0	16.7
Electrical and Communication	49.2	0.8	50.0
Plant Surface Facilities	12.2	2.1	14.3
Tailings and Water Management	61.5	15.1	76.6
Indirect and Owner’s Costs	145.4	9.2	154.6
Site Restoration	–	95.1	95.1
Subtotal	488.1	748.8	1,236.8
Contingency	55.4	12.8	68.2
Total Capital Costs	543.5	761.5	1,305.0
Production Revenue NSR		8,150.2	8,150.2

Notes: Totals may differ due to rounding. The total excludes grinding mills and camp sunk cost total of C$33.1M.

Table 8: Operating Cost Summary

Operating Costs (C$M)	Production
Mining	1,128.6
Processing	528.9
Tailings and Water Management	195.3
General & Administration	545.8
Total Operating Costs	2,398.6

Mining

The mineral resources used in the mine plan are contained in three different zones (Lynx, Main and Underdog) over a strike length of 2,300 metres and span from surface to a depth of approximately 1,500 metres. Each zone is characterized by multiple tabular panels, which mainly trend ENE and dip vertically to sub-vertically.

The underground mine will have a production rate of 3,100 tpd. The selected mining method is long-hole open stoping with longitudinal retreat. Stope dimensions vary from 10 to 30 metres in strike length and 20 to 25 metres in height, with a minimum thickness of 4 metres. Mineralized material will be extracted using a fleet of 15 tonne load-haul-dump trucks and 51 tonne haul trucks using a ramp to surface.

Processing

A total of 3,100 tpd of material will be processed in a plant that consists of primary crushing, followed by a grinding circuit consisting of a semi-autogenous grinding mill (22’ x 12’ in closed circuit with a pebble crusher) and ball mill (17’ x 25’ in closed circuit with cyclones – SABC circuit). A gravity circuit followed by leaching will recover coarse gold from the cyclone underflow, while the cyclone overflow, at a P₈₀= 37 microns, is treated in an eight (8) tank carbon-in–leach circuit, followed by SO2/air cyanide destruction. Gold and silver will be recovered in an adsorption-desorption-recovery circuit and electrowinning cells, with gold room recovery and production of bullion bars.

The process plant is followed by a tailings pond for the first year, and then by a tailings filtration plant with filter press to produce paste backfill to send underground and/or dry material for tailings dry stack storage.

The process plant payable gold recovery is estimated to average 94.8% and 78.3% for silver over the LOM.

The process plant building will include a laboratory, mine and mill offices, a dry, warehouse and a first aid office.

Surface Infrastructure and Indirect Costs

The mining and processing infrastructure will be located at the Windfall site. The mine envisions the upgrade of existing surface infrastructure: site access road; potable water and sewage systems; underground mine portal(s); mine ventilation systems (intake and exhaust); main and remote gatehouses; surface truck shop; waste rock stockpile; overburden stockpile; mineralized material stockpile; and construction of the following infrastructure items: process plant complex, including crushing line, offices, dry and warehouse; 94 kilometre 120 kV overhead transmission line from Lebel-sur-Quévillon; 120 kV main substation; final effluent water treatment plant; surface water management facility, including ditches, pond and pumping stations; service and haulage roads; and tailings management facility. Existing infrastructure includes waste rock stockpile, overburden stockpile and camp complex items such as dormitories and cafeteria.

Indirect costs including owner’s costs, engineering, procurement and construction management, temporary facilities for construction and other related items are estimated at C$146 million. An additional C$55.4 million (pre-production) has been budgeted as contingency for specific direct and indirect costs.

Environment and Closure

The Windfall project is located on territory governed by the James Bay and Northern Québec Agreement (“JBNQA”) and, as such subject to the Environmental and Social Impact Assessment (“ESIA”) and review process outlined in the JBNQA. All mining projects located in the JBNQA territory are also subject to the Environment Quality Act (Québec). If the ESIA report for the Windfall project is submitted prior to August 29, 2022, the project would be grandfathered under the prevailing Canadian Environmental Assessment Act (2012) regime and, as a result, require a federal environmental assessment (“EA”). However, if the report is submitted after August 29, 2022, the project would not require a federal EA under the Impact Assessment Agency of Canada (2019), as the daily tonnage rate is less than 5,000 tpd threshold.

Environmental baseline data collection has been initiated and all collected baseline data will inform the ESIA, which is currently underway.

In addition to provincial EA approval, the project will require permits and authorizations prior to construction and operation of the mine. Requests for these approvals will be submitted following the EA approval.

A closure plan for the Windfall project has been developed in accordance with the Mining Act (Québec), the closure costs are estimated at C$95.1 million. The objective of site closure is to return the site to a fully satisfactory state that includes eliminating all unacceptable health hazards and ensuring public safety, eliminating the production and spread of contaminants that could damage the receiving environment and, in the long term (aiming to cease the necessity of maintenance and monitoring) returning the site to environmentally sound condition. This estimate includes all costs for site restoration as well as post-closure monitoring, 30% of direct costs for engineering and a contingency of 15% as prescribed in the MERN Guidelines. In accordance with the regulations, the Corporation will post a bond as a guarantee for the site closure costs.

Stakeholder Engagement

The Windfall project is located on the traditional lands of the Cree community of Waswanipi. Osisko has been proactive in stakeholder consultation, holding more than 170 communication activities since 2015, primarily with the Cree First Nation of Waswanipi and Lebel-sur-Quévillon communities. Information has also been shared with the communities of Chapais, Chibougamau, Senneterre, the Lac Simon Anishinabeg First Nation and the Atikamekw First Nation of Obedjiwan, as they have expressed an interest in learning about 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, committees 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 addressing concerns and 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 2020 more than 100 First Nations’ community members worked at the Windfall site. Since 2016, Osisko has purchased over C$115 Million dollars in goods and services from First Nations-owned companies or joint ventures.

Royalties

A 2.0% net smelter return (“NSR”) royalty on all metals produced from the Windfall project has been applied in the PEA.

Notes

(1) Mineral Resource Estimates notes for Windfall Deposit

1. The independent qualified person for the 2021 MRE, as defined by NI 43-101 guidelines, is Pierre-Luc Richard, P.Geo.(OGQ#1119), of BBA Inc. The effective date of the estimate is November 30, 2020.
2. The Windfall mineral resource estimate is compliant with the November 29, 2019 CIM Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines.
3. These mineral resources are not mineral reserves as they have not demonstrated economic viability. The quantity and grade of reported inferred mineral resources in this news release are uncertain in nature and there has been insufficient exploration to define these resources as indicated or measured mineral resources; however, it is reasonably expected that the majority of inferred mineral resources could be upgraded to indicated mineral resources with continued exploration.
4. Resources are presented undiluted and in situ and are considered to have reasonable prospects for economic extraction. Isolated and discontinuous blocks above the stated cut-off grade are excluded from the mineral resource estimate. Must-take material, i.e. isolated blocks below cut-off grade located within a potentially mineable volume, was included in the mineral resource estimate.
5. As of November 30, 2020, the drill database comprised a total of 3,612 drill holes for 1,343,593 metres of drilling in the area extent of the mineral resource estimate, of which 2,959 drill holes (1,161,872 metres) were completed and assayed by Osisko. The drill hole grid spacing is approximately 12.5 metre x 12.5 metre for definition drilling, 25 metre x 25 metre for infill drilling and larger for extension drilling.
6. All core assays reported by Osisko were obtained by analytical methods described below under “Quality Control and Reporting Protocols”.
7. Geological interpretation of the deposit is based on lithologies, mineralization style, alteration and structural features. Most mineralization envelopes are subvertical, striking NE-SW and plunging approximately 40 degrees towards the North-East. The 3D wireframing was generated in Leapfrog Geo, a modelling software, from hand selections of mineralization intervals. The mineral resource estimate includes a total of 374 tabular, mostly sub-vertical domains defined by individual wireframes with a minimum true thickness of 2.0 metres.
8. Assays were composited within the mineralization domains into 2.0 metres length composites. A value of 0.00125 g/t Au and 0.0025 g/t Ag (¼ of the detection limit) was applied to unassayed core intervals.
9. High-grade composites were capped. Cappings were determined in each area from statistical studies on groups of zones sharing similar mineralization characteristics. Cappings vary from 10 g/t Au to 200 g/t Au and from 5 g/t Ag to 150 g/t Ag. A multiple capping strategy defined by capping values decreasing as interpolation search distances increase was used in the grade estimations.
10. Block models were produced using Datamine™ Studio RM Software. The models are defined by parent cell sizes of 5 metres NE, 2 meters NW and 5 metres height, and sublocked to minimum subcell sizes of 1.25 meters NE, 0.5 metres NW and 1.25 metres height.
11. Ordinary Kriging (OK) based interpolations were produced for gold estimations in each area of the Windfall deposit, while silver grade estimations were produced using Ordinary Kriging (OK) or Inverse Distance Squared (ID2) interpolations. Gold estimation parameters are based on composite variography analyses. The gold estimation parameters were used for the silver estimation.
12. Density values of 2.8 were applied to the mineralized zones.
13. The Windfall mineral resource estimate categorizes the measured, indicated and inferred mineral resources using the following criteria:
a. The measured mineral resource category is manually defined and enclosed areas where:
i. the drill spacing is less than 12.5 metres,
ii. blocks are informed by a minimum of four drill holes,
iii. geological evidence is sufficient to confirm geological and grade continuity,
iv. zones have been accessed by underground workings.
b. The indicated mineral resource category is manually defined and encloses areas where:
i. the drill spacing is generally less than 12.5 metres,
ii. blocks are informed by a minimum of two drill holes,
iii. geological evidence is sufficient to assume geological and grade continuity.
c. The inferred mineral resource category is manually defined and encloses areas where:
i. drill spacing is less than 100 metres,
ii. blocks are informed by a minimum of two drill holes,
iii. geological evidence is sufficient to imply, but not verify geological and grade continuity.

14. The mineral resource estimate is reported at 3.5 g/t Au cut-off. The cut-off grade is based on the following economic parameters: gold price at 1,485 USD/oz, exchange rate at 1.30 USD/CAD, 94% mill recovery; payability of 99.95%; selling cost at 5 USD/oz, 2% NSR royalties, mining cost at 100 C$/t milled, G&A cost at 30 C$/t milled, processing cost at 40 C$/t, transportation cost at 2 C$/t considering mill at site, and environment cost at 10 C$/t. A cut-off grade of 3.5 g/t Au was selected over the calculated cut-off grade of 3.2 g/t Au to better reflect a realistic mining cut-off.
15. Estimates use metric units (metres, tonnes and g/t). Metal contents are presented in troy ounces (metric tonne x grade / 31.10348).
16. The independent qualified person is not aware of any known environmental, permitting, legal, title-related, taxation, socio-political or marketing issues, or any other relevant issue, that could materially affect the mineral resource estimate.
17. Values in tonnes and ounces are rounded to nearest thousand which may cause apparent discrepancies.

Independent Qualified Persons

This PEA was prepared for Osisko by BBA Inc. and other industry consultants, with each being a “qualified person” under NI 43-101. Each “qualified person” has reviewed and approved the content of this news release, including the following who are independent for the purposes of NI 43-101:

Nicolas St-Onge, P.Eng. (A2GC)
Colin Hardie, P.Eng., Martin Houde, P.Eng., Pierre-Luc Richard, P. Geo., Charlotte Athurion, P. Geo. (BBA)
Patrick Langlais, P.Eng. (Entech Mining)
Yves Boulianne, P. Eng., Michel Mailloux, P. Eng. (Golder)
Eric Poirier, P. Eng., Isabelle Larouche, P.Eng., Simon Latulippe, P.Eng. (WSP)
Marie-Claude Dion St-Pierre, P. Eng. (GCM Consultants)

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 for the Windfall gold deposit is supported by a technical report prepared in accordance with NI 43-101 and entitled “Mineral Resource Estimate Update for the Windfall Project, Eeyou Istchee James Bay, Québec, Canada” dated March 8, 2021 (with an effective date of November 30, 2020), and prepared by BBA Inc. for Osisko (the “Windfall MRE (2021)”). The Windfall MRE (2021) assumes 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 are further described in the Windfall MRE (2021), 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.

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: estimates and assumptions underlying the PEA; projected production; after-tax IRR; pre-tax IRR; after tax NPV; after-tax NPV; pre-tax NPV; life of mine estimates; after-tax free cash flows; AISC and break-even cost estimates; capex estimates; NPV/capex ratios; tpd milling operations at the Windfall mill; processing estimates; average recovery; projected gross revenue and taxes; job creation estimates; the profitability of Windfall; future drilling results; Osisko’s ability to convert additional inferred resource ounces into measured and indicated categories; timing for production (if at all); mining and processing infrastructure; environmental assessment and closure plans matters; stakeholder engagement and relationships; the significance of the results disclosed in this news release; the PEA providing a robust base case analysis; the viability of ramp-access to the underground deposit; the advancement of the ramp; Osisko’s ability to convert additional high-grade mineral resources; the timing and ability to publish a DFS, including in H1 2022 (or at all); the key assumptions, parameters and methods used to estimate the mineral resource estimate in the Windfall MRE (2021) and PEA; 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 timing and ability of Osisko, if at all, to publish the DFS; 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; key assumptions, parameters or methods used to estimate the mineral resource estimate in the Windfall MRE (2021) or PEA becoming untrue or unachievable; the ability of the Corporation to obtain required approvals; the results of exploration activities; title deficiencies; 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

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Month: April 2021

OSISKO DRILLING AT WINDFALL RETURNS HIGH GRADE AT LYNX

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OSISKO FILES PEA UPDATE TECHNICAL REPORT FOR WINDFALL PROJECT

OSISKO INFILL DRILLING RETURNS HIGH GRADE AT LYNX

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OSISKO DRILLING RETURNS HIGH GRADE AT LYNX

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OSISKO MINING DELIVERS POSITIVE PEA UPDATE FOR WINDFALL

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