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Message: Osisko Intersects 30 g/t Au Over 2.4 Metres at Windfall

 

2017-12-05 08:00:25 AM ET (Marketwired)
   
   

TORONTO, ONTARIO--(Marketwired - Dec. 5, 2017) - Osisko Mining Inc. (TSX:OSK) ("Osisko" or the "Corporation") is pleased to provide new results from the ongoing drill program at its 100% owned Windfall Lake gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec. The 800,000 metre drill program combines definition, expansion and exploration drilling in and around the main Windfall gold deposit and the adjacent Lynx deposit (located immediately NE of Windfall). Significant new analytical results from 52 intercepts in 40 drill holes focused on infill and expansion drilling in the Underdog, Caribou, Zone 27 and Mallard corridors of the Windfall deposit are presented below.

Highlights from the new results include: 30 g/t Au over 2.4 metres, in OSK-W-17-1141; 10.2 g/t Au over 5.4 metres in OSK-W-17-1125, 26.0 g/t Au over 2.2 metres in OSK-W-17-1125-W3 and 5.38 g/t Au over 9.0 metres in OSK-W-17-1186. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Hole No.         From   To     Interval Au          Au     Zone         Corridor
                 (m)    (m)    (m)      (g/t) uncut (g/t)
                                                    cut to
                                                    100
                                                    g/t
OSK-W-17-885-W2  1199.0 1201.0 2.0      10.8          FW0 FW       Underdog
including        1199.0 1200.0 1.0      21.3         
OSK-W-17-935     80.0   82.8   2.8      3.34          Mallard HW   Mallard
including        82.0   82.8   0.8      9.71         
OSK-W-17-1013    9.2    12.0   2.8      4.56          27           Zone 27
including        9.6    10.1   0.5      24.9         
OSK-W-17-1025    94.9   96.9   2.0      4.17          TBD          Caribou
OSK-W-17-1026    83.6   85.9   2.3      4.93          27 infill    Zone 27
including        85.0   85.9   0.9      12.4         
            92.7   95.9   3.2      4.38          27 infill    Zone 27
including        94.8   95.9   1.1      11.2         
OSK-W-17-1028    727.5  729.5  2.0      6.77          Caribou Extn Caribou
OSK-W-17-1042    84.0   86.3   2.3      3.53          27 infill    Zone 27
OSK-W-17-1050    39.7   41.7   2.0      11.2          Z27          Zone 27
OSK-W-17-1065    31.9   34.2   2.3      3.28          Mallard 2    Mallard
OSK-W-17-1066    214.5  216.5  2.0      4.21          Vein         Caribou
OSK-W-17-1095    113.0  116.0  3.0      4.09          27 infill    Zone 27
OSK-W-17-1105    468.0  470.0  2.0      3.42          New          TBD
including        468.0  469.0  1.0      6.71         
            772.0  774.0  2.0      4.49          27           Zone 27
including        772.3  772.9  0.6      14.5         
OSK-W-17-1125    753.6  759.0  5.4      10.2          FW2          Underdog
including        755.9  757.2  1.3      36.3         
OSK-W-17-1125-W3 516.8  519.0  2.2      26.0          Wolf HW      Caribou
including        517.5  518.2  0.7      80.5         
OSK-W-17-1139    520.0  523.4  3.4      4.87          CN1 FW       Caribou
including        521.6  521.9  0.3      19.8         
OSK-W-17-1140    937.3  942.0  4.7      3.56          27           Zone 27
OSK-W-17-1141    59.4   61.8   2.4      30.0          27 infill    Zone 27
including        59.4   61.0   1.6      44.7         
            71.7   74.0   2.3      8.04          27 infill    Zone 27
including        73.4   74.0   0.6      28.0         
OSK-W-17-1142    142.0  144.0  2.0      3.07          27 HW infill Zone 27
OSK-W-17-1147-W1 798.0  800.4  2.4      3.36          TBD          Shear
            909.0  911.0  2.0      3.94          TBD          Caribou
OSK-W-17-1152    367.0  369.0  2.0      5.67          FW1          Underdog
including        368.0  368.6  0.6      16.6         
OSK-W-17-1155    327.0  329.7  2.7      3.64          VNCR         Mallard
including        329.0  329.7  0.7      12.9         
OSK-W-17-1158    596.0  598.4  2.4      4.12          Caribou Extn Caribou
including        597.0  597.8  0.8      10.6         
OSK-W-17-1168    544.0  546.6  2.6      3.99          VNCR         Caribou
including        546.0  546.6  0.6      15.4         
OSK-W-17-1179    742.8  745.5  2.7      4.56          New          Underdog
including        742.8  743.7  0.9      11.6         
OSK-W-17-1186    228.0  237.0  9.0      5.38          Caribou      Caribou
including        229.1  229.6  0.5      28.4         
including        236.0  237.0  1.0      23.6         
            863.0  866.0  3.0      15.7          FW3U         Underdog
including        863.0  864.6  1.6      27.5         
OSK-W-17-1188    147.5  149.9  2.4      3.09          27           Zone 27
including        148.9  149.9  1.0      6.97         
            167.8  169.8  2.0      3.28          27 infill    Zone 27
OSK-W-17-1196    155.5  158.0  2.5      3.26          27 infill    Zone 27
OSK-W-17-1209    236.4  239.2  2.8      4.68          FW4          Underdog
including        236.4  237.1  0.7      17.2         
OSK-W-17-1212    215.0  217.0  2.0      6.87          Mallard      Mallard
including        216.0  217.0  1.0      13.2         
OSK-W-17-1220    197.7  202.0  4.3      4.63          27 infill    Zone 27
OSK-W-17-1221    707.4  709.4  2.0      7.28          Caribou 1    Caribou
including        707.4  708.0  0.6      23.7         
            715.8  719.7  3.9      3.45          Caribou 1    Caribou
OSK-W-17-1224    70.3   73.1   2.8      15.7          Mallard 2    Mallard
including        72.7   73.1   0.4      44.2         
OSK-W-17-1226    743.4  746.2  2.8      3.43          Caribou Extn Caribou
including        743.4  744.0  0.6      8.96         
            765.0  767.0  2.0      3.78          Caribou Extn Caribou
including        765.0  765.6  0.6      11.6         
            852.7  855.0  2.3      3.42          CN2          Caribou
OSK-W-17-1227    419.9  422.0  2.1      4.37          Vein         Caribou
including        420.4  421.1  0.7      12.9         
            619.0  621.0  2.0      3.62          New          TDB
OSK-W-17-1228    50.7   53.0   2.3      7.59          Vein         Underdog
OSK-W-17-1232    149.0  151.5  2.5      5.50          27 infill    Zone 27
            183.0  186.0  3.0      3.99          27 infill    Zone 27
OSK-W-17-1243    99.6   101.6  2.0      5.23          27 infill    Zone 27
including        101.0  101.6  0.6      13.6         
OSK-W-17-1246    34.5   39.9   5.4      5.62          27 HW infill Zone 27
OSK-W-17-1252    18.5   21.0   2.5      3.55          Mallard      Mallard
including        19.3   20.3   1.0      8.74         
OSK-W-17-1253    43.0   47.3   4.3      4.88          27           Z27
            56.0   59.0   3.0      3.68          27           Z27

Notes:

True widths are estimated at 65 - 80% of the reported core length interval. See "Quality Control" below.

Definitions: FW = Foot Wall, HW = Hanging Wall, VNCR = Crustiform vein

Hole Number      Azimuth Dip Length UTM E  UTM N   Section
                 (o)     (o) (m)
OSK-W-17-885-W2  334     -69 1229   452861 5434494 2850
OSK-W-17-935     327     -51 474    452025 5434827 2275
OSK-W-17-1013    333     -48 24     452246 5434866 2475
OSK-W-17-1025    330     -58 990    452486 5434439 2475
OSK-W-17-1026    129     -45 147    452119 5434787 2325
OSK-W-17-1028    326     -59 807    452860 5434814 3000
OSK-W-17-1042    146     -52 156    452119 5434786 2325
OSK-W-17-1050    148     -49 106    452053 5434749 2250
OSK-W-17-1065    334     -56 330    452290 5434903 2550
OSK-W-17-1066    332     -56 639    452488 5434436 2475
OSK-W-17-1095    147     -50 147    451959 5434734 2175
OSK-W-17-1105    328     -71 834    452920 5434843 3050
OSK-W-17-1125    331     -58 975    452563 5434568 2625
OSK-W-17-1125-W3 331     -58 1086   452563 5434568 2625
OSK-W-17-1139    333     -56 1092   452473 5434470 2500
OSK-W-17-1140    336     -55 975    453006 5434522 2975
OSK-W-17-1141    236     -65 252    452143 5434747 2325
OSK-W-17-1142    324     -45 275    452202 5434628 2325
OSK-W-17-1147-W1 335     -52 1212   453241 5434381 3125
OSK-W-17-1152    330     -53 885    451738 5434293 1750
OSK-W-17-1155    332     -71 477    452451 5435008 2725
OSK-W-17-1158    331     -59 696    453046 5434871 3175
OSK-W-17-1168    329     -57 717    453464 5435090 3650
OSK-W-17-1179    332     -57 777    451560 5434376 1650
OSK-W-17-1186    331     -54 984    452419 5434554 2475
OSK-W-17-1188    318     -57 201    452067 5434618 2200
OSK-W-17-1196    310     -59 210    452066 5434618 2200
OSK-W-17-1209    331     -60 429    451456 5434453 1600
OSK-W-17-1212    330     -62 324    452303 5434914 2550
OSK-W-17-1218    327     -62 405    453004 5435009 3225
OSK-W-17-1220    141     -47 303    452025 5434811 2275
OSK-W-17-1221    335     -51 1079   453082 5434544 3050
OSK-W-17-1224    333     -70 402    452304 5434914 2550
OSK-W-17-1226    331     -51 934    453371 5434726 3400
OSK-W-17-1227    329     -50 1164   453290 5434532 3225
OSK-W-17-1228    328     -59 657    451443 5434484 1600
OSK-W-17-1232    154     -47 351    452025 5434834 2275
OSK-W-17-1243    146     -49 189    452060 5434781 2275
OSK-W-17-1246    324     -50 191    452082 5434636 2225
OSK-W-17-1252    324     -46 231    452132 5434944 2400
OSK-W-17-1253    337     -52 186    452081 5434634 2225

OSK-W-17-885-W2 intersected FW0 FW within the Underdog Corridor returning 10.8 g/t Au over 2.0 metres. The interval is composed of trace pyrite stringers and 10% centimetre scale quartz veins hosted in a chloritized felsic intrusive dike.

OSK-W-17-935 intersected 3.34 g/t Au over 2.8 metres related to Mallard HW, within the Mallard Corridor. Mineralization is composed of trace disseminated pyrite and stringers hosted in a silicified and sericitized rhyolite.

OSK-W-17-1013 infilled Zone 27 with 4.56 g/t Au over 2.8 metres. Mineralization is composed of up to 6% pyrite stringers and 16% semi-massive pyrite with tourmaline in pervasive silica flooding zone hosted is a sericitized rhyolite.

OSK-W-17-1025 intersected 4.17 g/t Au over 2.0 metres. The interval is composed of trace pyrite dissemination and clusters in a silicified gabbro. This intersection does not correlate to a known zone.

OSK-W-17-1026 intersected Zone 27 returning 4.93 g/t Au over 2.3 metres and 4.38 g/t Au over 3.2 metres. Mineralization is composed of trace clustered and disseminated pyrite in a silicified and sericitized felsic intrusive.

 OSK-W-17-1028 intersected 6.77 g/t Au over 2.0 metres. Mineralization consists of traces of disseminated pyrite and chalcopyrite in a chloritized andesite with 10% quartz-carbonate veins. This intersection does not correlate to a known zone.

OSK-W-17-1042 intersected 3.53 g/t Au over 2.3 metres in Zone 27. Mineralization is composed of 2% pyrite stringers, 1% disseminated pyrite, and a decimetre scale quartz vein within a sericitized, chloritized and slightly silicified felsic dyke. 

OSK-W-17-1050 infilled Zone 27 with 11.2 g/t Au over 2.0 metres. Mineralization consists of trace disseminated and stringer pyrite in a sericitized rhyolite.

OSK-W-17-1065 intersected 3.28 g/t Au over 2.3 metres related to Mallard 2. The interval occurs in a faulted zone with silica and sericite alteration and traces of pyrite-tourmaline stringer, trace disseminated pyrite and 13% tourmaline-quartz centimetre scale veins.

OSK-W-17-1066 intersected 4.21 g/t Au over 2.0 metres within the Caribou Corridor. Mineralization is composed of 3% disseminated pyrite and 1% quartz vein with pyrite hosted in a chloritized and slightly sericitized andesite.

OSK-W-17-1095 intersected 4.09 g/t Au over 3.0 metres related to Zone 27. Mineralization is composed of 2% - 3% tourmaline-pyrite veins hosted in a partially bleached, slightly sericitized and silicified andesite.

OSK-W-17-1105 intersected two intervals: 3.42 g/t Au over 2.0 metres and 4.49 g/t Au over 2.0 metres. The first interval is a new zone within an area between Caribou and the Lynx zones, geometry is to be determined. Mineralization is composed of 2% pyrite stringers in strongly chloritized and sericitized andesite. The second interval is related to Zone 27. Mineralization is composed of 1% pyrite stringers and 3% pyrite in association with crustiform veins, hosted in a felsic porphyry dike with sericite, silica and carbonate alteration.

OSK-W-17-1125 intersected 10.2 g/t Au over 5.4 metres related to FW2 in the Underdog Corridor. Mineralization is composed of 10% pyrite stringers hosted in a bleached andesite with one centimetre scale tourmaline-pyrite veinlets.

OSK-W-17-1125-W3 intersected 26.0 g/t Au over 2.2 metres related to Wolf HW in the Caribou Corridor. Mineralization is composed of 10% pyrite stringers hosted in a sericitized, chloritized and slightly silicified andesite.

OSK-W-17-1139 intersected 4.87 g/t Au over 3.4 metres related to CN1 FW in the Caribou Corridor. The interval consists of 2% pyrite stringers, 10% centimeter scale quartz veins in an andesite with strong chlorite and carbonate alteration and slight sericitization.

OSK-W-17-1140 intersected 3.56 g/t Au over 4.7 metres related to Zone 27. Mineralization is composed up 10% pyrite stringers in a sericitized felsic porphyric dike.

OSK-W-17-1141 infilled Zone 27 intersecting 30.0 g/t Au over 2.4 metres and 8.04 g/t Au over 2.3 metres. Mineralization includes up to 8% pyrite, 5% tourmaline-pyrite stringers and 3% pyrite clusters hosted in a sericitized rhyolite with intense pervasive silica flooding.

OSK-W-17-1142 intersected 3.07 g/t Au over 2.0 metres related to Zone 27 HW. Mineralization is composed of 14% pyrite stringers over 10 centimetres with pervasive silica flooding hosted in a rhyolite.

OSK-W-17-1147-W1 intersected 3.36 g/t Au over 2.4 metres and 3.94 g/t Au over 2.0 metres. The first interval is composed of 1% disseminated pyrite, trace pyrite clusters in a sericitized and lightly silicified rhyolite. This intersection is not related to any known zone. The second interval is composed of 3% pyrite stringers and semi massive sulfides over 60 cm hosted in a felsic dike with pervasive silica flooding, within the Caribou Corridor.

OSK-W-17-1152 intersected 5.67g/t Au over 2.0 metres related to FW1 in Underdog Corridor. Mineralization is composed of up 20% pyrite stringers, and 2% disseminated sphalerite in a sericitized and strongly silicified andesite.

OSK-W-17-1155 intersected 3.64 g/t au over 2.7 metres related to the Mallard Corridor. Mineralization is composed of traces of pyrite and chalcopyrite in a crustiform vein hosted in an andesite with chlorite, sericite and carbonates alteration.

OSK-W-17-1158 intersected 4.12 g/t Au over 2.4 metres related to Zone 27. The interval is composed of 10% pyrite stringers and traces of tourmaline-pyrite veins and a centime scale quartz-tourmaline vein hosted in a sericitized and bleached andesite.

OSK-W-17-1168 intersected 3.99 g/t Au over 2.6 metres in the Caribou Corridor. Mineralization is related to a crustiform vein with 1% pyrite stringers in a silicified gabbro with fuchsite.

OSK-W-17-1179 intersected 4.56 g/t Au over 2.7 metres related to the Underdog Corridor. Mineralization is composed of 5% pyrite with pervasive silica flooding in a sericitized felsic porphyric dike. It is a new zone located in western part of Underdog Corridor.

OSK-W-17-1186 intersected 5.38 g/t Au over 9.0 metres related to Caribou and 15.7 g/t Au over 3.0 metres related to FW3U in the Underdog Corridor. The first interval is composed of 10% pyrite stringers in an altered felsic porphyry dike with intense pervasive silica flooding. The second interval is composed of 5% pyrite in pervasive silica flooding, 4% pyrite cluster and stringer, and 2% pyrite in carbonates veining hosted in a felsic porphyric dike.

OSK-W-17-1188 intersected 3.09 g/t Au over 2.4 metres and 3.28 g/t Au over 2.0 metres in the Zone 27 Corridor. The first interval is composed of traces of pyrite-tourmaline stringers in a sericitized felsic porphyric dike. The second interval, Zone 27 infill, is composed of up to 5% tourmaline stringers and traces of disseminated pyrite in a pervasive silica flooding zone hosted in a sericitized rhyolite and felsic porphyric dike.

OSK-W-17-1196 infilled Zone 27 intersecting 3.26 g/t Au over 2.5 metres. The interval is at the sericitized contact between gabbro and rhyolite injected by low core angle crustiform veins. Mineralization is composed of 10% pyrite stringers, 4% disseminated pyrite or in clusters, and minor quartz veining.

OSK-W-17-1209 intersected 4.68 g/t Au over 2.8 metres related to FW4 in the Underdog Corridor. Mineralization is composed of massive pyrite (up 80%) over 70 cm in an altered zone with intense pervasive flooding hosted in a sericitized felsic porphyric dike.

OSK-W-17-1212 intersected Mallard returning 6.87 g/t au over 2.0 metres. Mineralization consists of 3% pyrite-tourmaline stringers, 1% pyrite stringers and 1% pyrite clusters in a strongly sericitized andesite.

OSK-W-17-1220 infilled Zone 27 intersecting 4.63 g/t Au over 4.3 metres. Mineralization is composed of 3% disseminated pyrite, 2% pyrite stringers, in a sericitized and bleached felsic porphyric dike.

OSK-W-17-1221 intersected 7.28 g/t Au over 2.0 metres and 3.45 g/t au over 3.9 metres related to Caribou 1. Mineralization is composed of up 10% pyrite stringers (fracture controlled) and clusters in a sericitized, chloritized and slightly silicified andesite.

OSK-W-17-1224 intersected 15.7 g/t Au over 2.8 metres related to Mallard 2. Mineralization is in a sericitized and silicified felsic porphyric dike at contact with andesite, including a ptygmatic tourmaline-quartz vein with 5% pyrite over 0.4 metre and semi-massive pyrite (40%) over 1.8 metres related to a pervasive silica flooding zone.

OSK-W-17-1226 intersected three intervals within Caribou Corridor; 3.43 g/t Au over 2.8 metres, 3.78 g/t Au over 2.0 metres and 3.42 g/t au over 2.3 metres. The first interval is a new zone at a sericitized and silicified contact between rhyolite and felsic intrusive composed of 35% pyrite-tourmaline stringers and 1% sphalerite-pyrite stringers. The second and third intervals correspond with up to 3% disseminated pyrite and pyrite stringers in a sericitized and chloritized andesite.

OSK-W-17-1227 intersected 4.37 g/t Au over 2.1 metres and 3.62 g/t Au over 2.0 metres. The first interval corresponds with 1% pyrite stringers and 4% pyrite-quartz-carbonate veins in a sheared and sericitized andesite. The second interval, can be related to the Main zone north-east extension (or south-west extension of Lynx), geometry remains to be determined. Mineralization is composed of 6% pyrite, traces of chalcopyrite and sphalerite in association with silica flooding and quartz-tourmaline veins hosted in a small quartz porphyry dike.

OSK-W-17-1228 intersected 7.59 g/t Au over 2.3 metres in the Underdog Corridor. Mineralization is composed of 2% pyrite in quartz-carbonates veins, trace pyrite stingers and metre scale quartz-carbonate veins hosted in a sericitized and strongly silicified rhyolite.

OSK-W-17-1232 infilled Zone 27 intersecting 5.50 g/t Au over 2.5 metres and 3.99 g/t Au over 3.0 metres. Mineralization is composed of up to 2% disseminated pyrite, 5% pyrite stringers and 2% tourmaline-pyrite veins in a strongly sericitized and bleached andesite. The second interval corresponds with 7% pyrite stringers in a sericitized felsic porphyric dike.

OSK-W-17-1243 infilled Zone 27 returning 5.23 g/t Au over 2.0 metres. Mineralization is composed of up to 7% pyrite stringers in a strongly sericitized to lightly silicified felsic porphyric dike.

OSK-W-17-1246 intersected Z27 HW with 5.62 g/t Au over 5.4 metres. Mineralization is composed of 3% irregular pyrite stringers, 2% disseminated pyrite in a strongly sericitized and chloritized felsic porphyry dike.

OSK-W-17-1252 intersected 3.55 g/t Au over 2.5 metres related to Mallard. Mineralization is composed of 25% pyrite stringers with locally clustered pyrite in a pervasive silica flooding zone hosted in a sericitized and silicified rhyolite.

OSK-W-17-1253 infilled Zone 27 with 4.88 g/t Au over 4.3 metres and 3.68 g/t au over 3.0 metres. Mineralization consists in up to 4% pyrite stringers and 5% pyrite clusters in a sericitized felsic dike.

Qualified Person

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

Quality Control and Reporting Protocols

True widths determinations are estimated at 65-80% of the reported core length intervals for most of the zones. Assays are uncut except where indicated. Intercepts occur within geological confines of major zones but have not been correlated to individual vein domains at this time. Reported intervals include minimum weighted averages of 3.0 g/t Au diluted over core lengths of at least 2.0 metres. All NQ core assays reported were obtained by either 1-kilogram screen fire assay or standard 50-gram fire-assaying-AA finish or gravimetric finish at ALS Laboratories in Val d'Or, Québec, Thunder Bay and Sudbury, Ontario or Vancouver, British Colombia or Bureau Veritas in Timmins, Ontario. The 1-kilogram screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. Selected samples are also analyzed for multi-elements, including silver, using an Aqua Regia-ICP-AES method at ALS Laboratories. Drill program design, Quality Assurance/Quality Control ("QA/QC") and interpretation of results is performed by qualified persons employing a QA/QC program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the Corporation as well as the lab. Approximately 5% of sample pulps are sent to secondary laboratories for check assay.

About the Windfall Lake Gold Deposit

The Windfall Lake gold deposit is located between Val-d'Or and Chibougamau in the Abitibi region of Québec, Canada. The mineral resource defined by the previous operator comprises 2,762,000 tonnes at 8.42 g/t Au (748.000 ounces) in the indicated category and 3,512,000 tonnes at 7.62 g/t Au (860,000 ounces) in the inferred category (sourced from a technical report dated June 10, 2015 entitled "Preliminary Economic Assessment of the Windfall Lake Gold Property, Québec, Canada" with an effective date of April 28, 2015, prepared in accordance with NI 43-101). The Windfall Lake gold deposit is currently one of the highest grade resource-stage gold projects in Canada. The bulk of the mineralization occurs in the Main Zone, a southwest/northeast trending zone of stacked mineralized lenses, measuring approximately 600 metres wide and at least 1.400 metres long. The deposit is well defined from surface to a depth of 500 metres, and remains open along strike and at depth. Mineralizati on has been identified only 30 metres from surface in some areas and as deep as 870 metres in others, with significant potential to extend mineralization up and down-plunge and at depth.

About Osisko Mining Inc.

Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% in the high-grade Windfall Lake gold deposit located between Val-d'Or and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100% interest in the Marban project located in the heart of Québec's prolific Abitibi gold mining district, and properties in the Larder Lake Mining Division in northeast Ontario, including the Jonpol and Garrcon deposits on the Garrison property, the Buffonta past producing mine and the Gold Pike mine property. The Corporation also holds interests and options in a number of additional properties in northern Quebec and Ontario. Osisko continues to be well financed with approximately $220 million in cash and investments.

Cautionary Note Regarding Forward-Looking Information

This news release contains "forward-looking information" within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. The information in this news release about the Windfall Lake gold deposit being one of the highest grade resource-stage gold projects in Canada; the current 800,000 metre drill program; the significance of new results from the ongoing drill program at the Windfall Lake gold project; the significance of assay results presented in this press release; the type of drilling included in the drill program (definition drilling, expansion drilling to the NE of the main deposit and adjacent Lynx deposit, and exploration drilling on the greater deposit and Urban-Barry project area); potential mineralization; the potential to extend mineralization up and down-plunge and at depth at the Windfall Lake gold deposit; the ability to realize upon any mineralizat ion in a manner that is economic; the ability to complete any proposed exploration activities and the results of such activities, including the continuity or extension of any mineralization; and any other information herein that is not a historical fact may be "forward-looking information". Any statement that involves discussions with respect to predictions, expectations, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as "expects", or "does not expect", "is expected", "interpreted", "management's view", "anticipates" or "does not anticipate", "plans", "budget", "scheduled", "forecasts", "estimates", "believes" or "intends" or variations of such words and phrases or stating that certain actions, events or results "may" or "could", "would", "might" or "will" be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to ident ify forward-looking information. This forward-looking information is based on reasonable assumptions and estimates of management of the Corporation at the time it was made. This involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Osisko to be materially different from any future results, performance or achievements expressed or implied by such forward-looking information. Such factors include, among others, risks relating to the ability of exploration activities (including drill results) to accurately predict mineralization; errors in management's geological modelling; the ability of Osisko to complete further exploration activities, including drilling; property interests in the Windfall Lake gold project; the ability of the Corporation to obtain required approvals and complete transactions on terms announced; the results of exploration activities; risks relating to mining activities; the global economic climate; metal prices; dilution; environmental risks; and community and non-governmental actions. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions. Osisko cannot assure shareholders and prospective purchasers of securities of the Corporation that actual results will be consistent with such forward-looking information, as there m ay 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.

John Burzynski President and Chief Executive Officer (416) 363-8653

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