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Osisko Mining Inc
Symbol C : OSK
Shares Issued 259,900,994
Close 2019-03-18 C$ 3.38
Recent Sedar Documents

Osisko Mining drills 4.1 m of 88 g/t Au at Windfall

2019-03-19 08:15 ET - News Release

Mr. John Burzynski reports

OSISKO WINDFALL INFILL DRILLING CONTINUES TO INTERSECT HIGH GRADE

Osisko Mining Inc. has provided new infill drilling results from the continuing definition and expansion program at its 100-per-cent-owned Windfall gold project located in the Abitibi greenstone belt, Urban township, Eeyou Istchee James Bay, Quebec. The program is currently focused on infill drilling within the main Windfall gold deposit and the adjacent Lynx deposit (located immediately northeast of Windfall), exploration and expansion drilling on the main mineralized zones, and deep exploration in the central areas of the intrusive system. Significant new analytical results from 101 intercepts in 39 drill holes and 17 wedges focused on infill drilling from surface and underground are presented below.

Highlights from new infill drilling results include: 88.0 grams per tonne Au over 4.1 metres in OSK-EAG-13-480-W2; 131 g/t Au over 2.1 metres in OSK-W-18-1656; 128 g/t Au over 2.0 metres in OSK-W-19-909-W8; 85.1 over 3.0 metres in OSK-W-18-1066-W3; 54.4 g/t Au over 3.1 metres in OSK-W-18-1386-W5; 59.9 g/t Au over 2.6 metres in WST-19-0060; 45.0 g/t Au over 3.0 metres in OSK-W-19-1426-W1; 9.56 g/t Au over 12.6 metres in OSK-W-19-1823; 52.9 g/t Au over 2.1 metres in OSK-W-18-1813; 34.9 g/t Au over 2.4 metres in OSK-W-19-1819-W1; 38.2 g/t Au over 2.0 metres in OSK-W-18-1759; 34.5 g/t Au over 2.2 metres in OSK-EAG-13-480-W1; 13.2 g/t Au over 4.9 metres in OSK-W-19-1343-W3; 9.37 g/t Au over 6.0 metres in OSK-W-18-1803; and 8.98 g/t Au over 6.4 metres in WST-18-0039. Maps showing hole locations and full analytical results are available at the company's website.

                                                          Au (g/t)   Au (g/t) cut
Hole No.             From (m)   To (m) Interval (m)         uncut      to 100 g/t   Type  Mineralized zone

OSK-EAG-13-480-W1      634.4    640.8          6.4           5.98                 Infill          Underdog
including              636.4    636.7          0.3           56.6
                       644.1    646.3          2.2           34.5                 Infill          Underdog
including              644.7    645.7          1.0           56.2
OSK-EAG-13-480-W2      694.9    697.6          2.7           3.93                 Infill          Underdog
including              694.9    695.6          0.7           11.2
                       656.0    660.1          4.1           88.0            11.5 Infill          Underdog
including              659.8    660.1          0.3           1145             100
OSK-EAG-13-508         611.0    613.4          2.4           11.6                 Infill           zone 27
including              612.5    613.4          0.9           30.4
OSK-W-17-960         1,031.0  1,033.2          2.2           7.06                 Infill              Lynx
including            1,032.9  1,033.2          0.3           50.8
                     1,036.8  1,038.9          2.1           13.7                 Infill              Lynx
including            1,037.6  1,037.9          0.3           57.1
OSK-W-17-993           992.0    994.3          2.3           5.95                 Infill              Lynx
including              992.6    992.9          0.3           43.1
OSK-W-18-747-W2        681.0    683.5          2.5           8.58                 Infill          Underdog
                       712.8    715.3          2.5           7.10                 Infill          Underdog
                       784.0    786.0          2.0           4.86                 Infill          Underdog
OSK-W-18-1025-W1       793.0    795.0          2.0           13.9                 Infill          Underdog
                       800.0    802.0          2.0           14.0                 Infill          Underdog
including              800.0    800.5          0.5           42.0
                       822.4    824.5          2.1           4.67                 Infill          Underdog
including              822.4    822.8          0.4           22.8
OSK-W-18-1066-W2       750.0    752.0          2.0           6.76                 Infill          Underdog
                     1,021.0  1,023.0          2.0           23.3                 Infill          Underdog
including            1,021.0  1,022.4          1.4           33.2
                     1,043.0  1,045.0          2.0           7.55                 Infill          Underdog
including            1,044.5  1,045.0          0.5           28.0
OSK-W-18-1066-W3       771.5    775.7          4.2           5.24                 Infill          Underdog
including              771.5    772.1          0.6           19.7
                       786.9    789.9          3.0           85.1            48.1 Infill          Underdog
including              788.0    789.4          1.4            179             100
OSK-W-18-1139-W1       815.2    817.5          2.3           5.65                                     Vein
including              815.2    815.9          0.7           17.6
OSK-W-18-1139-W3       783.4    786.0          2.6           6.46                 Infill          Underdog
including              783.4    783.7          0.3           33.1
                       843.0    845.2          2.2           5.26                 Infill          Underdog
including              843.6    843.9          0.3           43.4
OSK-W-18-1386-W4       820.4    822.8          2.4           12.1                 Infill              Lynx
                       877.1    881.1          4.0           11.7                 Infill              Lynx
including              878.0    878.5          0.5           30.7
                       904.4    906.9          2.5           10.7                 Infill              Lynx
                       941.0    943.0          2.0           9.43                 Infill              Lynx
                       952.0    954.0          2.0           8.22                 Infill              Lynx
OSK-W-18-1386-W5       831.6    834.7          3.1           54.4            21.4 Infill              Lynx
including              832.2    832.5          0.3            441             100
OSK-W-18-1424-W1       921.0    923.0          2.0           5.60                     Ex              Lynx
including              921.8    923.0          1.2           9.32
OSK-W-18-1656          730.0    736.0          6.0           5.07                 Infill              Lynx
including              730.0    730.5          0.5           36.5
                       783.7    786.0          2.3           8.08                 Infill              Lynx
including              784.7    785.3          0.6           23.0
                       900.7    902.8          2.1            131            33.9     Ex              Lynx
including              900.7    901.4          0.7            391             100
                     1,090.0  1,092.5          2.5           7.29                     Ex              Lynx
including            1,090.9  1,091.8          0.9           17.9
OSK-W-18-1680          332.7    335.2          2.5           9.92                 Infill           zone 27
including              332.7    333.3          0.6           30.6
OSK-W-18-1738          262.0    264.0          2.0           8.22                 Infill              Lynx
including              262.0    263.0          1.0           16.3
OSK-W-18-1747          202.6    205.0          2.4           5.99                 Infill           Caribou
including              203.2    203.7          0.5           26.0
                       273.3    276.0          2.7           3.09                 Infill           Caribou
including              273.3    273.6          0.3           11.0
OSK-W-18-1759          206.4    208.4          2.0           38.2                 Infill              Lynx
including              206.4    207.5          1.1           59.1
OSK-W-18-1779          197.0    199.1          2.1           4.05                 Infill           Caribou
OSK-W-18-1789          327.0    329.0          2.0           3.87                 Infill           Caribou
OSK-W-18-1803          443.0    445.0          2.0           3.74                 Infill           Caribou
including              443.5    444.2          0.7           9.77
                       519.0    525.0          6.0           9.37                 Infill           zone 27
including              523.9    525.0          1.1           30.9
OSK-W-18-1805           93.3     97.5          4.2           3.76                 Infill           Caribou
                       108.7    112.9          4.2           3.48                 Infill           Caribou
                       123.0    125.0          2.0           9.59                 Infill           Caribou
including              123.4    124.4          1.0           17.7
OSK-W-18-1806           55.8     57.8          2.0           3.74                 Infill           Caribou
OSK-W-18-1808          143.4    145.7          2.3           23.8                 Infill           Caribou
including              144.3    145.0          0.7           76.9
                       199.7    201.7          2.0           13.8                 Infill           Caribou
including              200.6    201.7          1.1           24.8
OSK-W-18-1810          113.0    115.0          2.0           3.35                 Infill           Caribou
                       546.0    548.0          2.0           5.86                 Infill           zone 27
including              547.0    548.0          1.0           11.3
OSK-W-18-1813          333.4    335.5          2.1           52.9                                     VNCR
including              333.4    334.5          1.1           98.9
                       515.2    517.3          2.1           15.8                 Infill           Caribou
including              516.2    517.3          1.1           30.1
                       580.9    583.0          2.1           5.54                 Infill           Caribou
                       637.4    639.6          2.2           4.38                 Infill           Caribou
including              638.1    638.8          0.7           11.8
OSK-W-18-1814          166.0    168.0          2.0           4.04                                     Vein
including              166.6    167.5          0.9           8.98
                       298.0    300.0          2.0           13.2                 Infill           Caribou
including              299.0    300.0          1.0           26.4
                       345.5    347.5          2.0           3.56                 Infill           Caribou
                       430.0    432.0          2.0           8.19                 Infill           Caribou
including              431.0    432.0          1.0           16.2
OSK-W-18-1817          341.0    343.0          2.0           3.45                 Infill           Caribou
including              341.0    342.0          1.0           6.61
                       406.0    408.0          2.0           7.60                 Infill           Caribou
including              406.8    407.6          0.8           18.1
                       555.0    557.3          2.3           5.93                 Infill           zone 27
OSK-W-19-909-W6        937.5    939.5          2.0           6.00                 Infill              Lynx
                     1,061.3  1,063.9          2.6           14.5                 Infill              Lynx
including            1,062.3  1,062.9          0.6           59.1
OSK-W-19-909-W8        960.0    962.0          2.0            128            39.6 Infill              Lynx
including              961.4    962.0          0.6            396             100
                       969.0    971.0          2.0           8.39                 Infill              Lynx
OSK-W-19-909-W9        957.0    959.0          2.0           4.86                 Infill              Lynx
OSK-W-19-1343-W3       584.6    589.5          4.9           13.2                 Infill              Lynx
including              584.6    585.6          1.0           50.9
OSK-W-19-1426-W1       594.4    596.5          2.1           4.23                 Infill              Lynx
                       600.1    602.5          2.4           6.48                 Infill              Lynx
including              600.1    600.5          0.4           35.4
                       622.8    625.8          3.0           45.0            33.4 Infill              Lynx
including              624.4    624.8          0.4            187             100
and                    625.4    625.8          0.4           99.8
OSK-W-19-1819-W1       590.3    592.3          2.0           5.63                 Infill              Lynx
including              591.0    591.4          0.4           20.4
                       601.0    603.4          2.4           34.9                 Infill              Lynx
including              602.5    603.4          0.9           71.4
OSK-W-19-1820          438.0    440.0          2.0           4.26                 Infill           Caribou
OSK-W-19-1822          513.0    515.0          2.0           4.39                 Infill           Caribou
including              514.0    515.0          1.0           8.62
OSK-W-19-1823          238.0    240.0          2.0           3.77                 Infill           Caribou
                       257.0    269.6         12.6           9.56                 Infill           Caribou
OSK-W-19-1824          230.0    237.0          7.0           3.29                 Infill           Caribou
including              230.0    231.0          1.0           13.1
OSK-W-19-1828          191.6    194.1          2.5           5.09                 Infill           Caribou
OSK-W-19-1830          181.0    183.6          2.6           8.84                 Infill           Caribou
OSK-W-19-1832          288.8    291.0          2.2           3.63                 Infill              Lynx
including              288.8    289.2          0.4           17.0
                       293.0    295.0          2.0           4.06                 Infill              Lynx
OSK-W-19-1834          154.7    157.5          2.8           12.4                 Infill           Caribou
including              156.6    157.5          0.9           25.9
OSK-W-19-1847          259.1    261.4          2.3           7.18                 Infill              Lynx
including              260.1    260.5          0.4           37.9
WST-18-0027             91.0     93.0          2.0           11.1                 Infill           zone 27
WST-18-0039             98.0    100.0          2.0           3.82                 Infill           zone 27
including               98.9     99.4          0.5           11.0
                       140.0    146.4          6.4           8.98                 Infill           Caribou
WST-18-0048             73.0     75.0          2.0           4.67                 Infill           zone 27
including               73.5     74.0          0.5           17.1
WST-19-0054A            66.0     68.7          2.7           9.37                 Infill           zone 27
including               67.7     68.7          1.0           23.3
WST-19-0055             66.7     68.7          2.0           4.87                 Infill           zone 27
including               68.2     68.7          0.5           17.4
WST-19-0056             65.0     69.8          4.8           3.57                 Infill           zone 27
WST-19-0057             67.3     72.0          4.7           4.99                 Infill           zone 27
                        75.8     78.0          2.2           4.47                 Infill           zone 27
WST-19-0058             61.8     66.5          4.7           3.08                 Infill           zone 27
including               65.5     66.5          1.0           9.55
WST-19-0059             81.0     83.7          2.7           5.16                 Infill           zone 27
                        96.7    100.6          3.9           4.04                 Infill           zone 27
                       103.0    105.2          2.2           14.8                 Infill           zone 27
including              103.5    103.9          0.4           61.9
                       113.8    116.1          2.3           4.08                 Infill           zone 27
WST-19-0060             69.9     73.0          3.1           4.72                 Infill           zone 27
                        80.0     82.6          2.6           59.9            27.6 Infill           zone 27
including               81.9     82.6          0.7            220             100
WST-19-0063             93.0     95.0          2.0           15.0                 Infill           zone 27
including               93.0     94.0          1.0           29.3
WST-19-0065A            86.4     89.9          3.5           12.0                 Infill           zone 27

Notes: Ex: expansion; VNCR: crustiform vein. True widths are estimated at 65 to 80 per cent of the reported 
       core length interval.

See attached quality control and reporting protocols.

Hole No.                 Length (m)

OSK-EAG-13-480-W1              651
OSK-EAG-13-480-W2              770
OSK-EAG-13-508                 627
OSK-W-17-960                 1,077
OSK-W-17-993                 1,053
OSK-W-18-1025-W1               852
OSK-W-18-1066-W2             1,065
OSK-W-18-1066-W3               849
OSK-W-18-1139-W1               874
OSK-W-18-1139-W3               918
OSK-W-18-1386-W4             1,059
OSK-W-18-1386-W5             1,100
OSK-W-18-1424-W1             1,485
OSK-W-18-1656                1,154
OSK-W-18-1680                  372
OSK-W-18-1738                  393
OSK-W-18-1747                  519
OSK-W-18-1759                  252
OSK-W-18-1779                  297
OSK-W-18-1789                  624
OSK-W-18-1803                  585
OSK-W-18-1805                  147
OSK-W-18-1806                  132
OSK-W-18-1808                  351
OSK-W-18-1810                  566
OSK-W-18-1813                  731
OSK-W-18-1814                  438
OSK-W-18-1817                  687
OSK-W-18-747-W2                798
OSK-W-19-1343-W3               637
OSK-W-19-1819-W1               654
OSK-W-19-1832                  345
OSK-W-19-1847                  293
OSK-W-19-909-W6              1,094
OSK-W-19-909-W8              1,053
OSK-W-19-909-W9              1,143
OSK-W-19-1426-W1               687
OSK-W-19-1820                  489
OSK-W-19-1822                  615
OSK-W-19-1823                  330
OSK-W-19-1824                  309
OSK-W-19-1828                  237
OSK-W-19-1830                  231
OSK-W-19-1834                  216
WST-18-0027                    106
WST-18-0039                    148
WST-18-0048                    142
WST-19-0054A                   156
WST-19-0055                    114
WST-19-0056                    144
WST-19-0057                    165
WST-19-0058                    118
WST-19-0059                    152
WST-19-0060                    165
WST-19-0063                    121
WST-19-0065A                   133

Note: WST series drill holes were 
      completed from underground 
      drill stations.

OSK-EAG-13-480-W1 intersected 5.98 g/t Au over 6.4 metres and 34.5 g/t Au over 2.2 metres in Underdog. The first interval is composed of up to 10 per cent disseminated pyrite stringers and clusters with quartz veinlets or pervasive silica flooding, trace chalcopyrite and sphalerite, and local visible gold. Mineralization is hosted in a sericite altered porphyritic felsic dike. The second interval contains local visible gold, 7 per cent pyrite in pervasive silica flooding, and up to 5 per cent pyrite stringers within a sericite altered porphyritic felsic dike.

OSK-EAG-13-480-W2 intersected 3.93 g/t Au over 2.7 metres and 88.0 g/t Au over 4.1 metres in Underdog. The first interval is composed of up to 7 per cent disseminated pyrite and stringers with local pervasive silica flooding, trace disseminated chalcopyrite and sphalerite, and pyrite-tourmaline stringers within a strong biotite and sericite altered fragmental felsic dike. The second interval contains local visible gold and electrum in quartz cluster veins, up to 20 per cent disseminated and stringer pyrite, ptygmatic tourmaline veins, and traces of chalcopyrite. The mineralization is hosted in a moderately to strongly sericitized porphyritic felsic dike.

OSK-EAG-13-508 intersected 11.6 g/t Au over 2.4 metres in zone 27. Mineralization is composed of 3 per cent pyrite stringers and 1 per cent pyrite clusters in a moderately bleached and sericitized andesite.

OSK-W-17-960 intersected two intervals in Lynx: 7.06 g/t Au over 2.2 metres and 13.7 g/t Au over 2.1 metres. The two intervals contain local visible gold, disseminated chalcopyrite and pyrite in a decimetre scale smoky-quartz vein, 3 per cent pyrite-tourmaline stringers, and 1 per cent chalcopyrite and sphalerite clusters in a silicified and sericitized rhyolite.

OSK-W-17-993 intersected 5.95 g/t Au over 2.3 metres in Lynx. Mineralization is composed of local visible gold, 2 per cent pyrite, trace arsenopyrite, chalcopyrite and sphalerite within a smoky quartz vein (three centimetres wide) at the contact with a sheared andesite and a massive rhyolite, all moderately silicified and sericitized.

OSK-W-18-747-W2 intersected three intervals in Underdog: 8.58 g/t Au over 2.5 metres, 7.10 g/t Au over 2.5 metres and 4.86 g/t Au over 2.0 metres. The first interval is composed of 5 per cent pyrite-tourmaline stringers with pervasive silica flooding including a 15-per-cent-pyrite interval 40 cm wide hosted in a moderate sericite and silica altered rhyolite. The second interval is composed of 5 per cent pyrite, trace chalcopyrite in pervasive silica flooding and quartz-tourmaline veins (locally ptygmatic) hosted in a moderate sericite and silica altered felsic porphyritic intrusion in contact with a gabbro. The third interval is composed of 3 per cent pyrite stringers, 3 per cent pyrite stockwork and pervasive silica flooding in a sericitized, silicified and bleached porphyritic felsic dike.

OSK-W-18-1025-W1 intersected three intervals in Underdog: 13.9 g/t Au over 2.0 metres, 14.0 g/t Au over 2.0 metres and 4.67 g/t Au over 2.1 metres. The first interval is composed of 5 per cent pyrite in pervasive silica flooding and 1 per cent disseminated pyrite in a sericitized porphyritic dike with weak fuchsite alteration. The second and third intervals contain local visible gold, 5 per cent pyrite in pervasive silica flooding and ptygmatic tourmaline veins, and up to 1 per cent chalcopyrite in a moderately sericitized and silicified porphyritic felsic intrusion.

OSK-W-18-1066-W2 intersected three intervals in Underdog; 6.76 g/t Au over 2.0 metres, 23.3 g/t Au over 2.0 metres and 7.55 g/t Au over 2.0 metres. The first interval contains up to 5 per cent pyrite with pervasive silica flooding and local ptygmatic tourmaline veins hosted in a moderately sericitized and silicified felsic porphyritic intrusion. The last two intervals contain trace pyrite stringers and pyrite-tourmaline stringers in a weakly sericitized porphyritic felsic dike.

OSK-W-18-1066-W3 intersected 5.24 g/t Au over 4.2 metres and 85.1 g/t Au over 3.0 metres in Underdog. The first interval contains 3 per cent disseminated pyrite and stringers, up to 15 per cent pyrite with pervasive silica alteration, local visible gold and sphalerite, and chalcopyrite within a silicified porphyritic felsic dike. The second interval contains local visible gold in fracture filling and stringers, and up to 20 per cent pyrite, trace sphalerite and chalcopyrite with pervasive silica flooding hosted in a moderately sericitized and bleached felsic porphyritic intrusion.

OSK-W-18-1139-W1 intersected 5.65 g/t Au over 2.3 metres corresponding with a quartz vein with trace pyrite at the contact between two porphyritic felsic dikes with moderate sericite alteration and weak silica and fuchsite alteration.

OSK-W-18-1139-W3 intersected two intervals in Underdog: 6.46 g/t Au over 2.6 metres and 5.26 g/t Au over 2.2 metres. The first interval contains 10 per cent pyrite associated with pervasive silica flooding in a sericitized and silicified felsic porphyritic intrusive. The second interval contains 20 per cent pyrite as clusters inside a pervasive silica flooded interval 20 cm wide hosted in a sericitized and silicified felsic porphyritic intrusive at the contact with a small felsic porphyritic fragmental dike.

OSK-W-18-1386-W4 intersected five intervals in Lynx: 12.1 g/t Au over 2.4 metres, 11.7 g/t Au over 4.0 metres, 10.7 g/t Au over 2.5 metres, 9.43 g/t Au over 2.0 metres and 8.22 g/t Au over 2.0 metres. The first interval contains up to 7 per cent disseminated pyrite, 3 per cent pyrite and trace chalcopyrite in quartz-tourmaline veins, 3 per cent pyrite clusters and trace pyrite stringers in a sericitized and weak silica and fuchsite altered gabbro. The last four intervals contain local visible gold, up to 5 per cent pyrite as clusters and stringers, 1 per cent sphalerite, and trace chalcopyrite in pervasive silica flooding hosted in a silicified, sericitized and fuchsite altered gabbro or sericitized and silicified rhyolite.

OSK-W-18-1386-W5 intersected 54.4 g/t Au over 3.1 metres in Lynx. Mineralization is composed of local visible gold, 4 per cent disseminated, clustered and stringer pyrite, and trace chalcopyrite with quartz-tourmaline veins and pervasive silica flooding hosted in a strongly bleached, silicified and fuchsite altered gabbro.

OSK-W-18-1424-W1 intersected 5.60 g/t Au over 2.0 metres in Lynx. Mineralization is composed of tourmaline-quartz veins with trace pyrite hosted in a sericitized gabbro.

OSK-W-18-1656 intersected 5.07 g/t Au over 6.0 metres, 8.08 g/t Au over 2.3 metres, 131 g/t Au over 2.1 metres and 7.29 g/t Au over 2.5 metres in Lynx. The first and second intervals contain 1 per cent disseminated and stringer pyrite in a moderately sericitized and weakly silicified porphyritic felsic dike. The third interval contains up to 3 per cent pyrite stringers with silica flooding hosted in a strong silica altered rhyolite. The last interval contains 5 per cent pyrite stringers and trace chalcopyrite within a moderate sericite altered gabbro.

OSK-W-18-1680 intersected 9.92 g/t Au over 2.5 metres in zone 27. Mineralization is composed of up to 5 per cent disseminated pyrite, 1 per cent pyrite stringers and quartz carbonate veins hosted in a moderately sericitized felsic porphyritic intrusion with small quartz eyes.

OSK-W-18-1738 intersected 8.22 g/t Au over 2.0 metres in Lynx. Mineralization is composed of traces of disseminated and clustered pyrite in a moderately chlorite, silica and carbonate altered gabbro.

OSK-W-18-1747 intersected two intervals in Caribou: 5.99 g/t Au over 2.4 metres and 3.09 g/t Au over 2.7 metres. The first interval contains up to 7 per cent pyrite stringers in pervasive silica flooding in a moderately sericitized and silicified felsic porphyritic intrusion. The second interval contains 4 per cent disseminated and stringer pyrite in a sericite and fuchsite altered gabbro.

OSK-W-18-1759 intersected 38.2 g/t Au over 2.0 metres in Lynx. Mineralization is composed of local visible gold and up to 20 per cent pyrite in pervasive silica flooded zones in a moderately sericitized and patchy silicified felsic intrusion.

OSK-W-18-1779 intersected 4.05 g/t Au over 2.1 metres in Caribou. Mineralization is composed of up to 40 per cent semi-massive pyrite, 10 per cent disseminated pyrite, 7 per cent pyrite stringers and 1 per cent pyrite clusters in a bleached sericitized and silicified andesite.

OSK-W-18-1789 intersected 3.87 g/t Au over 2.0 metres in Caribou. Mineralization is composed of 1 per cent pyrite stringers and trace chalcopyrite in pervasive silica flooding in a sericitized porphyritic felsic intrusion.

OSK-W-18-1803 intersected 3.74 g/t Au over 2.0 metres in Caribou and 9.37 g/t Au over 6.0 metres in zone 27. The first interval contains 1 per cent pyrite clusters and traces of chalcopyrite in a bleached and foliated andesite. The second interval contains local visible gold, up to 6 per cent pyrite clusters and trace chalcopyrite hosted in moderate to strong sericitized fragmental andesite in contact with a felsic porphyritic intrusion.

OSK-W-18-1805 intersected three intervals in Caribou: 3.76 g/t Au over 4.2 metres, 3.48 g/t Au over 4.2 metres and 9.59 g/t Au over 2.0 metres. Mineralization is composed of semi-massive pyrite bands locally up to 70 per cent pyrite, 5 per cent disseminated pyrite and 4 per cent pyrite stringers hosted in a slightly foliated, sericitized and silicified felsic porphyritic intrusion.

OSK-W-18-1806 intersected 3.74 g/t Au over 2.0 metres in Caribou. Mineralization is composed of 1 per cent disseminated pyrite and trace pyrite stringers in a moderate sericite, chlorite and weak silica altered porphyritic felsic dike.

OSK-W-18-1808 intersected two intervals in Caribou: 23.8 g/t Au over 2.3 metres and 13.8 g/t Au over 2.0 metres. The first interval contains up to 5 per cent pyrite within quartz-tourmaline veins and trace pyrite with tourmaline-ptygmatic veinlets at the contact between a sericitized and weakly foliated rhyolite and a felsic porphyritic intrusion. The second interval contains up to 5 per cent pyrite-tourmaline stringers and 2 per cent disseminated pyrite at the contact between a sericitized and patchy silicified porphyritic felsic dike and a rhyolite.

OSK-W-18-1810 intersected two intervals: 3.35 g/t Au over 2.0 metres in Caribou and 5.86 g/t Au over 2.0 metres in zone 27. The first interval contains clustered quartz and tourmaline-quartz veins in a chlorite, hematite and carbonate altered andesite. The second interval contains up to 5 per cent pyrite stringers with local stockwork texture hosted in weakly to moderately brecciated and bleached andesite in contact with a felsic porphyritic intrusion.

OSK-W-18-1813 intersected four intervals in Caribou: 52.9 g/t Au over 2.1 metres, 15.8 g/t Au over 2.1 metres, 5.54 g/t Au over 2.1 metres and 4.38 g/t Au over 2.2 metres. The first interval contains trace pyrite-tourmaline stringers and 1 per cent pyrite in quartz-tourmaline veins in a chloritized, weakly sericitized and silicified gabbro. The second interval contains 8 per cent disseminated pyrite, in cluster or fracture filling, and trace pyrite and chalcopyrite with quartz-tourmaline veins in a bleached and sericitized andesite. The third interval contains 3 per cent pyrite stringers in a weakly bleached andesite. The fourth interval contains up to 15 per cent pyrite stringers and 5 per cent disseminated pyrite with pervasive silica flooding hosted in a moderately bleached andesite in contact with a moderately sericitized porphyritic felsic dike.

OSK-W-18-1814 intersected four intervals in Caribou: 4.04 g/t Au over 2.0 metres, 13.2 g/t Au over 2.0 metres, 3.56 g/t Au over 2.0 metres and 8.19 g/t Au over 2.0 metres. The first interval contains 3 per cent pyrite stringers, 1 per cent disseminated pyrite and 5 per cent quartz clusters in a chloritized andesite. The second interval contains trace disseminated pyrite, 2 per cent pyrite stringers, trace quartz clusters in a sericitized and weak silica altered rhyolite. The third interval contains quartz-carbonate veins with trace pyrite at the contact between a rhyolite and a gabbro. The fourth interval contains traces of disseminated pyrite and pyrite-tourmaline stringers in pervasive silica flooding, within a sericite altered porphyritic felsic dike.

OSK-W-18-1817 intersected three intervals: 3.45 g/t Au over 2.0 metres and 7.60 g/t Au over 2.0 metres in Caribou and 5.93 g/t Au over 2.3 metres in zone 27. The first interval contains trace pyrite-tourmaline stringers in a moderately sericitized, silicified and bleached porphyritic felsic dike. The second interval contains 8 per cent pyrite as fragments inside a brecciated zone hosted in a strongly sericitized and moderately silicified felsic porphyritic intrusion. The third interval contains 5 per cent pyrite stringers in a moderately bleached and sericitized, weak silica altered porphyritic felsic dike.

OSK-W-19-909-W6 intersected 6.00 g/t Au over 2.0 metres and 14.5 g/t Au over 2.6 metres in Lynx. The first interval contains 5 per cent disseminated pyrite, 1 per cent pyrite stringers with local centimetre scale pyrite clusters in a moderately bleached and sericitized gabbro. The second interval contains local visible gold in quartz-carbonate shear-extension veins, up to 10 per cent pyrite stringers, 3 per cent ptygmatic tourmaline veins and trace chalcopyrite hosted in a moderate sericite altered gabbro.

OSK-W-19-909-W8 intersected 128 g/t Au over 2.0 metres and 8.39 g/t Au over 2.0 metres in Lynx. The first interval contains local visible gold hosted in pervasive silica flooding within a moderately sericitized rhyolite. The second interval contains 5 per cent pyrite stringers and clusters in a moderately sericitized rhyolite.

OSK-W-19-909-W9 intersected 4.86 g/t Au over 2.0 metres in Lynx. Mineralization is composed of 2 per cent pyrite stringers, traces ptygmatic tourmaline veins in a weakly sericitized porphyritic felsic dike.

OSK-W-19-1343-W3 intersected 13.2 g/t Au over 4.9 metres in Lynx. Mineralization is composed of 3 per cent pyrite stringers, 5 per cent disseminated pyrite with smoky quartz veins and quartz-tourmaline veinlets in a strongly silica altered rhyolite.

OSK-W-19-1426-W1 intersected 4.23 g/t Au over 2.1 metres, 6.48 g/t Au over 2.4 metres and 45.0 g/t Au over 3.0 metres in Lynx. The first interval contains 5 per cent pyrite clusters and fragments, 1 per cent pyrite stringers in a strongly silicified and moderately sericitized fragmental felsic dike. The second interval contains traces of disseminated pyrite within a strong carbonate, moderate sericite and chlorite altered andesite. The third interval contains 5 per cent pyrite and trace chalcopyrite with pervasive silica flooding, and trace pyrite stringers at a silicified contact between a gabbro and a porphyritic felsic unit.

OSK-W-19-1819-W1 intersected 5.63 g/t Au over 2.0 metres and 34.9 g/t Au over 2.4 metres in Lynx. The first interval contains 3 per cent pyrite stringers and 2 per cent pyrite clusters within a strong silica and sericite altered andesite. The second interval contains 2 per cent pyrite stringers and trace tourmaline-pyrite veins hosted in a moderate sericite altered rhyolite.

OSK-W-19-1820 intersected 4.26 g/t Au over 2.0 metres in Caribou. Mineralization is composed of 1 per cent pyrite clusters with quartz veins within a weakly sericitized and silicified porphyritic felsic dike.

OSK-W-19-1822 intersected 4.39 g/t Au over 2.0 metres in Caribou. Mineralization is composed of 1 per cent pyrite in clustered quartz veins within a chloritized and weakly sericitized and silicified bleached andesite.

OSK-W-19-1823 intersected 3.77 g/t Au over 2.0 metres and 9.56 g/t Au over 12.6 metres in Caribou. The first interval contains 3 per cent pyrite-tourmaline stringers hosted in a silicified and weakly sericitized rhyolite. The second interval contains up to 25 per cent pyrite stringers, clusters or disseminated, within strong pervasive silica flooding hosted in a silicified and moderately sericitized rhyolite.

OSK-W-19-1824 intersected 3.29 g/t Au over 7.0 metres in Caribou. Mineralization is composed of 2 per cent pyrite-tourmaline stringers within a sericitized and silicified porphyritic felsic dike.

OSK-W-19-1828 intersected 5.09 g/t Au over 2.5 metres in Caribou. Mineralization is composed of up to 7 per cent pyrite with crustiform quartz veins, 3 per cent pyrite stringers, 1 per cent pyrite associated with quartz-tourmaline veins, 2 per cent disseminated pyrite and 1 per cent pyrite clusters within a silicified and sericitized rhyolite.

OSK-W-19-1830 intersected 8.84 g/t Au over 2.6 metres in Caribou. Mineralization is composed of up to 5 per cent disseminated and stringer pyrite, 10 per cent pyrite clusters, and 1 per cent pyrite associated with ptygmatic tourmaline veins and trace sphalerite, and chalcopyrite in quartz-carbonate veins hosted in a sericitized porphyritic felsic dike.

OSK-W-19-1832 intersected 3.63 g/t Au over 2.2 metres and 4.06 g/t Au over 2.0 metres in Lynx. The first interval contains local visible gold, 1 per cent sphalerite and 5 per cent pyrite associated with a 20 cm wide quartz-carbonates-tourmaline vein hosted in weakly sericitized rhyolite. The second interval contains 4 per cent pyrite-tourmaline with silica patches and traces pyrite-tourmaline stringers in weakly sericitized rhyolite.

OSK-W-19-1834 intersected 12.4 g/t Au over 2.8 metres in Caribou. Mineralization is composed of up to 10 per cent disseminated pyrite, 5 per cent pyrite clusters, 2 per cent pyrite stringers, 2 per cent pyrite associated with quartz-carbonate veins, 2 per cent interstitial sphalerite, and trace disseminated chalcopyrite hosted in a sericitized and silicified fragmental felsic dike.

OSK-W-19-1847 intersected 7.18 g/t Au over 2.3 metres in Lynx. Mineralization is composed of up to 5 per cent disseminated, stringer and clustered pyrite with weak to moderate pervasive silica flooding and traces of disseminated pyrite with local quartz-tourmaline veins hosted in a strongly sericitized and moderately chloritized rhyolite.

WST-18-0027 intersected 11.1 g/t Au over 2.0 metres in zone 27. Mineralization includes 1 per cent disseminated pyrite within a moderate silica altered porphyritic felsic dike. WST-18-0027 was drilled from underground drill station AN-140-270-S located 140 metres below surface on Section 2575E.

WST-18-0039 intersected two intervals: 3.82 g/t Au over 2.0 metres in zone 27 and 8.98 g/t Au over 6.4 metres in Caribou. The first interval contains 5 per cent disseminated pyrite with pervasive silica flooding within a moderate silica and sericite altered rhyolite. The second interval contains 5 per cent disseminated pyrite with pervasive silica flooding and quartz-tourmaline veins within a moderate silica and sericite altered rhyolite. WST-18-0039 was drilled from underground drill station AN-160-020-S located 160 metres below surface on Section 2250E.

WST-18-0048 intersected 4.67 g/t Au over 2.0 metres in zone 27. Mineralization includes 2 per cent pyrite stringers within a moderate sericite altered andesite. WST-18-0048 was drilled from underground drill station AN-160-020-S located 160 metres below surface on Section 2250E.

WST-19-0054A intersected 9.37 g/t Au over 2.7 metres in zone 27. Mineralization includes local visible gold, 15 per cent semi-massive pyrite and 1 per cent pyrite-tourmaline stringers hosted in a moderate sericite altered porphyritic felsic intrusion. WST-19-0054A was drilled from underground drill station BM-150-960-S located 150 metres below surface on Section 2175E.

WST-19-0055 intersected 4.87 g/t Au over 2.0 metres. Mineralization includes up to 1 per cent semi-massive pyrite, 5 per cent pyrite stringers and 7 per cent pyrite clusters hosted in a moderately sericite and weakly fuchsite altered gabbro and in a moderately sericitized dacite. WST-19-0055 was drilled from underground drill station BM-150-960-S located 150 metres below surface on Section 2175E.

WST-19-0056 intersected 3.57 g/t Au over 4.8 metres in zone 27. Mineralization includes up to 3 per cent pyrite clusters with quartz-carbonate veinlets and up to 5 per cent pyrite stringers in a moderately sericitized and locally hematized rhyolite in contact with a felsic porphyritic intrusion. WST-19-0056 was drilled from underground drill station BM-150-960-S located 150 metres below surface on Section 2175E.

WST-19-0057 intersected 4.99 g/t Au over 4.7 metres and 4.47 g/t Au over 2.2 metres in zone 27. The first interval contains up to 5 per cent pyrite stringers with patchy silica, 2 per cent disseminated pyrite, up to 15 per cent pyrite as clusters and stringers hosted in a silica altered rhyolite in contact with a felsic porphyritic intrusion. The second interval contains 1 per cent pyrite stringers with quartz veins at the contact between a porphyritic felsic dike unit and a gabbro. WST-19-0057 was drilled from underground drill station BM-150-960-S located 150 metres below surface on Section 2175E.

WST-19-0058 intersected 3.08 g/t Au over 4.7 metres in zone 27. Mineralization includes 2 per cent pyrite-tourmaline stringers, trace pyrite clusters and 1 per cent chalcopyrite clusters hosted in a strong sericite and weak silica altered dacite. WST-19-0058 was drilled from underground drill station BM-150-960-S located 150 metres below surface on Section 2175E.

WST-19-0059 intersected four intervals in zone 27: 5.16 g/t Au over 2.7 metres, 4.04 g/t Au over 3.9 metres, 14.8 g/t Au over 2.2 metres, and 4.08 g/t Au over 2.3 metres. The first interval contains 3 per cent tourmaline ptygmatic veins, 4 per cent pyrite in a semi-massive band, 3 per cent quartz-tourmaline veins in a moderately sericitized, silicified and local fuchsite altered porphyritic felsic dike. The second interval contains up to 10 per cent pyrite with a ptygmatic tourmaline vein, 5 per cent pyrite semi-massive with silica patches, 1 per cent pyrite stringers and 1 per cent disseminated pyrite within a sericite, silica and fuchsite altered porphyritic felsic dike. The third interval contains 2 per cent pyrite stringers and trace disseminated pyrite within a sericitized porphyritic felsic dike. The fourth interval contains 4 per cent disseminated pyrite, 2 per cent arsenopyrite clusters and trace chalcopyrite in a breccia zone hosted in a porphyritic fragmental felsic intrusion. WST-19-0059 was drilled from underground drill station BM-150-960-S located 150 metres below surface on Section 2175E.

WST-19-0060 intersected 4.72 g/t Au over 3.1 metres, and 59.9 g/t Au over 2.6 metres in zone 27. The first interval contains up to 40 per cent pyrite stringers and trace pyrite clusters within a moderate sericite and weak silica altered rhyolite. The second interval contains traces pyrite and pyrite-tourmaline stringers within a moderate sericite and fuchsite altered dacite. WST-19-0060 was drilled from underground drill station BM-150-960-S located 150 metres below surface on Section 2175E.

WST-19-0063 intersected 15.0 g/t Au over 2.0 metres in zone 27. Mineralization includes 2 per cent semi-massive pyrite, up to 7 per cent pyrite with ptygmatic tourmaline veins, 1 per cent pyrite stringers and trace disseminated pyrite hosted in a weakly sericitized and patchy fuchsite altered felsic porphyritic intrusion. WST-19-0063 was drilled from underground drill station BM-150-960-S located 150 metres below surface on Section 2175E.

WST-19-0065A intersected 12.0 g/t Au over 3.5 metres. Mineralization includes up to 3 per cent pyrite stringers, 5 per cent pyrite with quartz tourmaline veins and 3 per cent disseminated pyrite hosted in a weakly to moderately sericitized dacite. WST-19-0065A was drilled from underground drill station BM-150-960-S located 150 metres below surface on Section 2175E.

Qualified person

The scientific and technical content of this news release has been reviewed, prepared and approved by Louis Grenier, MScA, PGeo (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.

Quality control and reporting protocols

True width determination is estimated at 65 per cent o 80 per cent 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 one-kilogram screen fire assay or standard 50-gram fire-assaying-AA finish or gravimetric finish at (i) ALS Laboratories in Val d'Or, Que.; Thunder Bay, Ont.; Sudbury, Ont.; or Vancouver, B.C.; or (ii) Bureau Veritas in Timmins, Ont. The one-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 multielements, 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 are 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 per cent 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 Osisko, as disclosed in the Windfall Lake technical report (as defined below) and Nov. 27, 2018, Lynx resource update, comprises 2,874,000 tonnes at 8.17 g/t Au (754,000 ounces) in the indicated mineral resource category and 10,352,000 tonnes at 7.11 g/t Au (2,366,000 ounces) in the inferred mineral resource category. For details regarding the key assumptions, parameters and methods used to estimate the mineral resources presented in respect of the Windfall Lake gold project, please see the technical report entitled "Technical Report and Mineral Resource Estimate for the Windfall Lake Project, Windfall Lake and Urban-Barry Properties" and dated June 12, 2018 (effective date of May 14, 2018), which has been prepared by InnovExplo Inc. from Val d'Or, Que., and the press release "Osisko releases mineral resource update for Lynx" dated Nov. 27, 2018, which has been prepared by Osisko and reviewed and approved by Micon International Ltd. from Toronto, Ont. The Windfall Lake technical report and press release are available on Osisko's website and on SEDAR under Osisko's issuer profile. The Windfall Lake gold deposit is currently one of the highest grade resource-stage gold projects in Canada. Mineralization occurs in four principal zones: Lynx, zone 27, Caribou and Underdog. All zones comprise subvertical lenses following intrusive porphyry contacts plunging to the northeast. The deposit is well defined from surface to a depth of 900 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-per-cent interest in the high-grade Windfall Lake gold deposit located between Val d'Or and Chibougamau in Quebec and holds a 100-per-cent undivided interest in a large area of claims in the surrounding the Urban Barry area and nearby Quevillon area (over 3,300 square kilometres).

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