Osisko Intersects 115 g/t Au Over 5.6 Metres at Windfall

TORONTO, Sept. 01, 2020 (GLOBE NEWSWIRE) -- Osisko Mining Inc. (OSK:TSX. "Osisko" or the "Corporation") is pleased to provide new analytical results from the ongoing definition and expansion drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

Drilling is currently focused on the Lynx deposit, the main mineralized zones, and down plunge exploration in the central areas of the mineralized system. Osisko President and Chief Executive Officer John Burzynski commented: “We continue to be impressed with the strong results from Lynx, and are seeing good possibilities to extend the mineralization in the known zones. While we are focused on completing the infill drilling, the deposit continues to grow in the process.”

Infill results are presented below. Significant new analytical results from 96 intercepts in 38 new drill holes and 26 wedges include: 115 g/t Au over 5.6 metres and 25.6 g/t Au over 5.0 metres in OSK-W-20-2256-W2; 57.9 g/t Au over 3.6 metres in OSK-W-20-2139-W9; 94.4 g/t Au over 2.0 metres in WST-20-0389A; 54.4 g/t Au over 3.3 metres in OSK-W-20-2260-W2; 77.3 g/t Au over 2.3 metres in OSK-W-20-2268-W3; 42.8 g/t Au over 3.1 metres in OSK-W-20-2243-W4; 31.2 g/ Au over 4.1 metres OSK-W-20-2252-W2; 62.2 g/t Au over 2.0 metres in OSK-W-20-2299; and 47.4 g/t Au over 2.5 metres in WST-20-0471. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Hole No.	From (m)	To (m)	Interval (m)	Au (g/t) uncut	Au (g/t) cut to 100 g/t	Zone	Corridor
OSK-W-18-1741-W1	847.0	849.7	2.7	7.02		Lynx 4	Lynx
including	848.2	848.7	0.5	33.1
OSK-W-19-1942	447.0	449.7	2.7	3.25		Lynx_323	Lynx
including	448.3	448.9	0.6	14.0
OSK-W-19-1963-W3	1401.0	1403.5	2.5	3.03		Lynx_345	Lynx
OSK-W-19-2059-W1	735.0	737.0	2.0	3.77		Lynx	Lynx
	985.9	988.0	2.1	9.43		Lynx 4	Lynx
OSK-W-19-2139-W4	545.0	547.1	2.1	5.80		Triple Lynx	Triple Lynx
including	546.5	547.1	0.6	18.4
OSK-W-19-2221	775.0	777.0	2.0	5.48		Lynx 4	Lynx
including	775.7	776.1	0.4	26.4
OSK-W-20-1104-W7	502.0	504.3	2.3	34.6		Lynx	Lynx
including	503.0	504.0	1.0	79.1
OSK-W-20-1731-W5	607.0	609.0	2.0	11.9		Lynx	Lynx
OSK-W-20-2059-W3	992.8	995.0	2.2	7.28		Lynx 4	Lynx
OSK-W-20-2059-W4	1077.0	1079.0	2.0	3.40		Lynx 4	Lynx
including	1077.7	1078.0	0.3	17.4
OSK-W-20-2139-W8	565.0	567.4	2.4	9.28		Triple Lynx	Triple Lynx
including	566.2	566.8	0.6	36.9
OSK-W-20-2139-W9	908.9	912.5	3.6	57.9	15.6	Lynx_361	Triple Lynx
including	912.0	912.5	0.5	405	100
OSK-W-20-2170-W5	980.5	982.5	2.0	3.28		Lynx_363	Triple Lynx
OSK-W-20-2217-W4	768.7	775.0	6.3	9.98		Triple Lynx	Triple Lynx
including	772.8	773.6	0.8	52.3
	781.0	783.0	2.0	4.08		Triple Lynx	Triple Lynx
	793.6	795.8	2.2	4.42		Triple Lynx	Triple Lynx
including	795.2	795.5	0.3	24.4
	917.0	919.0	2.0	10.9		Triple Lynx	Triple Lynx
including	918.0	918.3	0.3	71.9
	972.0	974.0	2.0	22.8		Triple Lynx	Triple Lynx
including	973.0	974.0	1.0	43.9
	981.0	983.0	2.0	29.2	15.6	Triple Lynx	Triple Lynx
including	981.3	981.6	0.3	191	100
OSK-W-20-2243-W3	1016.0	1018.0	2.0	16.7		Lynx_374	Triple Lynx
including	1016.0	1017.0	1.0	33.3
OSK-W-20-2243-W4	773.4	776.5	3.1	42.8	20.9	Lynx_361	Triple Lynx
including	774.8	775.1	0.3	326	100
	829.0	831.0	2.0	4.09		Lynx_364	Triple Lynx
OSK-W-20-2249	374.6	376.6	2.0	3.44		Caribou	Caribou
OSK-W-20-2250-W1	973.0	975.0	2.0	48.6	15.4	Triple Lynx	Triple Lynx
including	973.5	973.8	0.3	321	100
OSK-W-20-2250-W3	748.0	750.0	2.0	3.11		Triple Lynx	Triple Lynx
	756.4	758.5	2.1	11.5		Triple Lynx	Triple Lynx
including	756.8	757.1	0.3	42.9
OSK-W-20-2250-W4	744.0	746.0	2.0	14.7		Lynx_371	Triple Lynx
including	744.0	745.0	1.0	27.3
	764.7	767.0	2.3	10.8		Lynx_361	Triple Lynx
including	765.7	766.4	0.7	33.1
OSK-W-20-2252-W1	832.0	834.6	2.6	27.6	13.2	Lynx_371	Triple Lynx
including	834.3	834.6	0.3	225	100
	861.0	863.0	2.0	4.86		Triple Lynx	Triple Lynx
OSK-W-20-2252-W2	837.0	841.2	4.2	12.9		Triple Lynx	Triple Lynx
including	838.8	839.5	0.7	59.7
	856.0	860.1	4.1	31.2	12.7	Lynx_371	Triple Lynx
including	859.7	860.1	0.4	290	100
	1154.0	1156.8	2.8	5.37		Lynx_374	Triple Lynx
OSK-W-20-2252-W3	940.1	943.0	2.9	4.33		Lynx_363	Triple Lynx
including	940.1	940.4	0.3	21.3
OSK-W-20-2253	554.1	556.4	2.3	5.60		Triple Lynx	Triple Lynx
including	554.1	555.0	0.9	12.2
	596.7	599.0	2.3	3.01		Triple Lynx	Triple Lynx
including	598.7	599.0	0.3	16.4
OSK-W-20-2256	830.7	833.4	2.7	4.61		Triple Lynx	Triple Lynx
OSK-W-20-2256-W2	855.0	859.0	4.0	4.21		Triple Lynx	Triple Lynx
	874.7	880.3	5.6	115	16.0	Lynx_361	Triple Lynx
including	876.5	877.1	0.6	1020	100
	931.9	936.0	4.1	3.78		Lynx_369	Triple Lynx
including	931.9	932.2	0.3	12.0
and	935.0	936.0	1.0	8.94
	940.0	945.0	5.0	25.6		Lynx_369	Triple Lynx
including	940.0	941.0	1.0	53.4
OSK-W-20-2260-W1	939.0	942.0	3.0	6.19		Lynx_369	Triple Lynx
including	939.0	940.0	1.0	14.0
OSK-W-20-2260-W2	838.7	842.0	3.3	54.4		Lynx_361	Triple Lynx
including	838.7	840.5	1.8	88.2
	878.0	880.0	2.0	4.25		Triple Lynx	Triple Lynx
	891.0	893.0	2.0	12.2		Lynx_363	Triple Lynx
including	891.8	892.3	0.5	36.5
	909.9	912.0	2.1	4.77		Lynx_364	Triple Lynx
	941.0	943.0	2.0	10.1		Triple Lynx	Triple Lynx
OSK-W-20-2266-W1	767.5	769.9	2.4	4.08		Lynx_363	Triple Lynx
OSK-W-20-2268-W1	812.5	814.5	2.0	4.64		Triple Lynx	Triple Lynx
including	813.7	814.1	0.4	12.1
OSK-W-20-2268-W3	779.0	781.3	2.3	77.3	18.6	Lynx_364	Triple Lynx
including	780.7	781.0	0.3	550	100
	790.9	796.0	5.1	4.60		Triple Lynx	Triple Lynx
OSK-W-20-2269	510.2	513.0	2.8	8.05		Lynx	Lynx
including	510.2	510.5	0.3	72.3
OSK-W-20-2271	775.0	777.0	2.0	7.99		Lynx	Lynx
	1108.6	1114.2	5.6	13.2		Lynx 4	Lynx
including	1110.8	1111.5	0.7	51.6
OSK-W-20-2275	670.3	672.4	2.1	4.13		Triple Lynx	Triple Lynx
including	670.3	670.7	0.4	10.6
OSK-W-20-2276	83.6	85.9	2.3	3.11		F17_6003	F-17
including	84.7	85.0	0.3	18.6
	94.0	96.3	2.3	7.06		F17_6003	F-17
including	94.6	95.0	0.4	38.0
	98.5	102.0	3.5	4.09		F17_6005	F-17
OSK-W-20-2278	105.5	107.5	2.0	6.36		F17_6002	F-17
including	106.4	106.9	0.5	18.7
OSK-W-20-2281	125.0	129.0	4.0	3.08		F17_6003	F-17
including	125.0	126.0	1.0	7.28
and	128.5	129.0	0.5	7.46
OSK-W-20-2288	169.6	172.0	2.4	6.44		Caribou_2527	Caribou
	193.0	195.0	2.0	13.8		Caribou_2527	Caribou
including	194.0	194.6	0.6	24.5
	204.7	206.8	2.1	3.77		Caribou_2527	Caribou
OSK-W-20-2289	98.6	101.0	2.4	10.7		F17_6003	F-17
including	100.0	101.0	1.0	22.1
OSK-W-20-2291	89.7	92.0	2.3	18.2		F17_6003	F-17
including	89.7	90.5	0.8	24.3
and	90.5	91.3	0.8	26.7
OSK-W-20-2293	114.6	117.3	2.7	5.30		F17_6003	F-17
including	114.6	114.9	0.3	11.0
and	116.8	117.3	0.5	10.1
OSK-W-20-2298	487.0	489.0	2.0	11.2		Lynx_356	Lynx
including	487.7	488.6	0.9	24.6
OSK-W-20-2299	134.7	136.7	2.0	62.2	41.5	F17_6003	F-17
including	135.1	135.9	0.8	152	80.0
WST-19-0225	325.0	327.0	2.0	5.17		Caribou	Caribou
WST-19-0238	89.1	91.1	2.0	4.32		Lynx	Lynx
WST-20-0308	148.5	150.7	2.2	5.98		Lynx	Lynx
including	150.1	150.7	0.6	21.5
WST-20-0318	258.0	260.5	2.5	6.53		Lynx 4	Lynx
including	260.0	260.5	0.5	22.9
WST-20-0335	32.0	34.3	2.3	4.51		Lynx	Lynx
WST-20-0342A	172.6	175.0	2.4	5.15		Lynx_304	Lynx
including	174.6	175.0	0.4	18.0
WST-20-0343	60.9	63.2	2.3	11.0		Lynx_311	Lynx
including	60.9	61.3	0.4	60.0
	86.9	88.9	2.0	3.90		Lynx_304	Lynx
WST-20-0345	1.0	4.1	3.1	11.4		Mallard	Mallard
including	1.0	2.5	1.5	20.9
WST-20-0350	41.6	44.4	2.8	9.18		Lynx_325	Lynx
including	41.6	42.4	0.8	29.3
	113.5	116.0	2.5	17.6		Lynx_304	Lynx
including	114.0	114.9	0.9	45.7
WST-20-0351	96.0	98.0	2.0	4.25		Lynx_304	Lynx
including	96.9	97.6	0.7	10.9
WST-20-0388	284.6	287.5	2.9	38.8	23.2	Lynx 4	Lynx
including	286.9	287.5	0.6	176	100
WST-20-0389A	162.3	164.3	2.0	94.4	50.9	Lynx_304	Lynx
including	163.0	164.0	1.0	187	100
	169.3	171.5	2.2	23.5	14.9	Lynx_304	Lynx
including	169.6	169.9	0.3	163	100
	322.0	324.3	2.3	4.44		Lynx_321	Lynx
including	323.2	323.9	0.7	14.4
WST-20-0396	138.5	141.1	2.6	3.54		Lynx HW	Lynx
including	140.3	140.6	0.3	20.2
WST-20-0397	136.6	138.6	2.0	10.7		Lynx_301	Lynx
including	137.7	138.1	0.4	52.1
WST-20-0417	368.0	370.0	2.0	3.21		Lynx 4	Lynx
WST-20-0438	137.0	139.0	2.0	29.6	15.2	Lynx	Lynx
including	137.6	137.9	0.3	197	100
WST-20-0442	239.0	241.0	2.0	3.09		Lynx 4	Lynx
WST-20-0446	167.9	170.0	2.1	34.2	29.9	Lynx_304	Lynx
including	167.9	168.5	0.6	115	100
	349.0	352.0	3.0	9.32		Lynx HW	Lynx
WST-20-0462	263.8	266.0	2.2	7.77		Lynx	Lynx
WST-20-0468	143.8	146.7	2.9	3.18		Lynx_321	Lynx
including	143.8	144.7	0.9	6.34
WST-20-0471	126.0	128.5	2.5	47.4	32.0	Lynx_321	Lynx
including	127.7	128.5	0.8	148	100
	154.9	157.0	2.1	12.4		Lynx_315	Lynx
including	155.8	156.5	0.7	36.0

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-18-1741-W1	144	-48	1083	453328	5435466	406	3725
OSK-W-19-1942	128	-54	930	453315	5435390	403	3675
OSK-W-19-1963-W3	123	-58	1460	453761	5435816	401	4275
OSK-W-19-2059-W1	131	-52	1041	453446	5435477	400	3825
OSK-W-19-2139-W4	115	-52	1011	452980	5435549	420	3450
OSK-W-19-2221	134	-49	789	453422	5435465	401	3800
OSK-W-20-1104-W7	142	-50	867	453383	5435455	402	3775
OSK-W-20-1731-W5	139	-51	1028	453383	5435518	409	3800
OSK-W-20-2059-W3	131	-52	1029	453446	5435477	400	3825
OSK-W-20-2059-W4	131	-52	1092	453446	5435477	400	3825
OSK-W-20-2139-W8	115	-52	1125	452980	5435549	420	3450
OSK-W-20-2139-W9	115	-52	1152	452980	5435549	420	3450
OSK-W-20-2170-W5	128	-59	1148	453425	5435657	413	3900
OSK-W-20-2217-W4	134	-48	1134	452943	5435566	419	3425
OSK-W-20-2243-W3	122	-54	1062	453087	5435527	418	3550
OSK-W-20-2243-W4	122	-54	1121	453087	5435527	418	3550
OSK-W-20-2249	132	-56	759	452775	5435192	411	3100
OSK-W-20-2250-W1	132	-57	1060	453128	5435505	420	3575
OSK-W-20-2250-W3	132	-57	1170	453128	5435505	420	3575
OSK-W-20-2250-W4	132	-57	1005	453128	5435505	420	3575
OSK-W-20-2252-W1	129	-54	1119	453241	5435694	415	3750
OSK-W-20-2252-W2	129	-54	1194	453241	5435694	415	3750
OSK-W-20-2252-W3	129	-53	1062	453241	5435694	415	3750
OSK-W-20-2253	128	-54	924	452831	5435326	413	3225
OSK-W-20-2256	125	-51	1179	453160	5435686	414	3675
OSK-W-20-2256-W2	125	-51	957	453160	5435686	414	3675
OSK-W-20-2260-W1	127	-48	1140	453199	5435669	413	3700
OSK-W-20-2260-W2	127	-48	1191	453199	5435669	413	3700
OSK-W-20-2266-W1	128	-55	1116	453069	5435476	418	3500
OSK-W-20-2268-W1	127	-55	1073	453148	5435489	418	3575
OSK-W-20-2268-W3	127	-55	975	453148	5435489	418	3575
OSK-W-20-2269	133	-50	933	452972	5435211	416	3275
OSK-W-20-2271	120	-53	1247	453462	5435683	410	3950
OSK-W-20-2275	127	-49	1094	452886	5435584	409	3400
OSK-W-20-2276	149	-47	138	452639	5435493	405	3125
OSK-W-20-2278	158	-53	186	452632	5435522	405	3150
OSK-W-20-2281	149	-47	171	452630	5435550	404	3150
OSK-W-20-2288	146	-51	749	452875	5435181	410	3175
OSK-W-20-2289	149	-47	141	452664	5435521	407	3175
OSK-W-20-2291	158	-48	131	452692	5435522	410	3200
OSK-W-20-2293	145	-44	183	452658	5435549	407	3175
OSK-W-20-2298	137	-50	596	452846	5435060	407	3100
OSK-W-20-2299	150	-49	201	452681	5435584	404	3225
WST-19-0225	132	-9	329	452208	5434899	249	2475
WST-19-0238	173	12	97	453216	5435114	224	3450
WST-20-0308	172	-12	160	453292	5435139	163	3525
WST-20-0318	148	-52	502	453228	5435127	134	3475
WST-20-0335	141	-42	142	453411	5435230	113	3675
WST-20-0342A	116	-47	679	453452	5435266	115	3725
WST-20-0343	158	8	177	453410	5435229	115	3675
WST-20-0345	136	-21	401	452282	5434975	263	2575
WST-20-0350	142	-31	175	453359	5435209	154	3625
WST-20-0351	142	-19	181	453359	5435209	154	3625
WST-20-0388	169	-55	516	453228	5435127	134	3475
WST-20-0389A	115	-46	616	453452	5435266	115	3725
WST-20-0396	158	20	165	453493	5435287	118	3775
WST-20-0397	150	26	162	453494	5435287	118	3775
WST-20-0417	138	-50	759	453228	5435126	134	3475
WST-20-0438	163	-16	145	453449	5435264	115	3725
WST-20-0442	134	-32	265	453494	5435287	116	3775
WST-20-0446	115	-49	613	453452	5435265	114	3725
WST-20-0462	152	-53	680	453227	5435125	134	3475
WST-20-0468	130	2	193	453494	5435287	117	3775
WST-20-0471	156	2	181	453493	5435287	117	3775

Lynx Zone

Mineralization occurs as grey to translucent quartz-carbonate-pyrite-tourmaline veins and pyrite replacement zones and stockworks. The vein-type 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.

Caribou Zone

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

F-Zone

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

Mallard

Mineralization is hosted in sheared mafic volcanics with felsic porphyritic intrusions and occurs as veins associated with sericite-pyrite ± silica ± chlorite alteration and contains pyrite ranging from trace to 30% and local visible gold.

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

Quality Control and Reporting Protocols
True width determination is 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. All NQ core assays reported were obtained by either 1-kilogram screen fire assay or standard 50-gram fire-assaying-AA finish or gravimetric finish at (i) ALS Laboratories in Val d'Or, Québec, Thunder Bay, Ontario, Sudbury, Ontario or Vancouver, British Colombia, or (ii) Bureau Veritas in Timmins, Ontario. The 1-kilogram screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. Selected samples are also analyzed for multi-elements, including silver, using an Aqua Regia-ICP-AES method at ALS Laboratories. Drill program design, Quality Assurance/Quality Control ("QA/QC") and interpretation of results is performed by qualified persons employing a QA/QC program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the Corporation as well as the lab. Approximately 5% of sample pulps are sent to secondary laboratories for check assay.

About the Windfall Gold Deposit
The Windfall gold deposit is located between Val-d'Or and Chibougamau in Eeyou Istchee James Bay, Québec, Canada. The mineral resource defined by Osisko, as disclosed in the news release dated February 19, 2020 and supported by the technical report entitled “An updated mineral resource estimate for the Windfall Lake Project, Located in the Abitibi Greenstone Belt, Urban Township, Eeyou Istchee James Bay, Québec, Canada” and dated April 3, 2020 (with an effective date of January 3, 2020), and assuming a cut-off grade of 3.5 g/t, comprises 4,127,000 tonnes at 9.1 g/t Au (1,206,000 ounces) in the indicated mineral resource category and 14,532,000 tonnes at 8.40 g/t Au (3,938,000 ounces) in the inferred mineral resource category. The key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in the February 19,2020 news release are further described in the full technical report prepared by Micon International Limited ("Micon") and BBA Inc ("BBA"), in accordance with NI 43-101 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 deformed sub-vertical zones plunging to the northeast. Vein-type or pyrite replacement-type styles of mineralization crosscut syn-volcanic host rocks and syn-deformation felsic porphyry intrusions and are spatially associated with the contacts of the intrusions. The deposit is well defined from surface to a depth of 1,200 metres and remains open along strike and at depth. Mineralization has been identified 30 metres from surface in some areas and as deep as 2,000 metres in others, with significant potential to extend mineralization down-plunge and at depth.

About Osisko Mining Inc.
Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% 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; the prospects, if any, of the Windfall gold deposit; the timing and ability of Osisko, if at all, to publish a feasibility study for the Windfall gold deposit; the projected capital expenditures of mining activities at the Windfall gold deposit; upgrading an inferred mineral resource to a measured mineral resource or indicated mineral resource category; future drilling at the Windfall gold deposit; the deposit remaining open along strike to the northeast and at depth; significant high-grade zones (Lynx 4, Triple Lynx) remaining open down plunge; the plunge potential of the Lynx and Underdog zones; 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 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
President & Chief Executive Officer
Telephone (416) 363-8653