Osisko Windfall Infill and Expansion Drilling Adds High-Grade

385 g/t Au Over 2.1 Metres

45.5 g/t Au over 4.1 Metres

TORONTO, June 23, 2021 (GLOBE NEWSWIRE) -- 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 [phone]