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Marketwired
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Osisko Mining Intersects 30 g/t Au Over 2.4 Metres at Windfall

TORONTO, ONTARIO -- (Marketwired) -- 12/05/17 -- 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, Quebec. 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.

----------------------------------------------------------------------------
                                                  Au
                                                (g/t)
                                           Au   cut to
                  From     To   Interval  (g/t)   100
Hole No.           (m)     (m)     (m)    uncut   g/t    Zone     Corridor
----------------------------------------------------------------------------
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
----------------------------------------------------------------------------
                                                        Caribou
OSK-W-17-1028     727.5   729.5    2.0    6.77           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
----------------------------------------------------------------------------
                                                         27 HW
OSK-W-17-1142     142.0   144.0    2.0    3.07          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
----------------------------------------------------------------------------
                                                        Caribou
OSK-W-17-1158     596.0   598.4    2.4    4.12           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
----------------------------------------------------------------------------
                                                        Caribou
OSK-W-17-1226     743.4   746.2    2.8    3.43           Extn      Caribou
------------------------------------------------------
including         743.4   744.0    0.6    8.96
----------------------------------------------------------------------------
                                                        Caribou
                  765.0   767.0    2.0    3.78           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
----------------------------------------------------------------------------
                                                         27 HW
OSK-W-17-1246     34.5    39.9     5.4    5.62          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:

1.  True widths are estimated at 65 - 80% of the reported core length
    interval. See "Quality Control" below.
2.  Definitions: FW = Foot Wall, HW = Hanging Wall, VNCR = Crustiform vein

----------------------------------------------------------------------------
                      Azimuth     Dip     Length
Hole Number             (o)       (o)       (m)     UTM E   UTM N   Section
----------------------------------------------------------------------------
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, Quebec, 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 Quebec, 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, Quebec, 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. Mineralization 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 Quebec 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 Quebec'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 mineralization 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 identify 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 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.

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

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