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Osisko Intersects 161 g/t Au Over 8.0 Metres at Windfall

TORONTO, Nov. 25, 2019 (GLOBE NEWSWIRE) -- Osisko Mining Inc. (OSK:TSX. "Osisko" or the "Corporation") is pleased to provide new drilling results from the ongoing definition and expansion drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

The program is currently focused on infill drilling and expansion drilling at the Lynx deposit, exploration on the main mineralized zones, and deep exploration in the central areas of the mineralized intrusive system. Twenty-two drills are active at Lynx and Triple Lynx, with another two drills conducting infill and exploration drilling on other areas of the deposit.

Osisko President and Chief Executive Officer John Burzynski commented: “Infill drilling in the Lynx zones is delivering strong results. We are especially pleased with Triple Lynx as it continues to infill very well and is adding significant ounces. We expect continued good results from Lynx as we progress with our expansion and infill drill program.”

Significant new analytical results from 71 intercepts in 17 surface drill holes and 19 wedges focused on Lynx infill and expansion drilling are presented below. Additionally, 11 intercepts from 9 underground infill drill holes, including the Lynx bulk sample area, are included in the table below.

Intercepts from new results include: 491 g/t Au over 3.3 metres in OSK-19-1193-W2; 161 g/t Au over 8.0 metres in OSK-W-19-2068-W2; 267 g/t Au over 2.7 metres in WST-19-0209; 138 g/t Au over 2.0 metres and 37.4 g/t Au over 5.6 metres in OSK-W-19-1949-W3. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Surface Drilling

Hole No. From
(m)
To
(m)
Interval
(m)
Au (g/t)
uncut
Au (g/t)
cut to
100 g/t
Zone Corridor
OSK-W-17-1272 898.7 901.6 2.9 12.4   Triple Lynx Triple Lynx
including 900.7 901.6 0.9 38.8  
OSK-W-18-1560-W2 754.5 765.6 11.1 4.51   Lynx_331 Lynx
OSK-W-18-1582 874.2 877.3 3.1 13.6   Lynx_331 Lynx
OSK-W-18-1687 765.5 767.6 2.1 46.1 40.6 Lynx_331 Lynx
including 766.8 767.6 0.8 115 100
OSK-W-19-923-W4 892.3 894.3 2.0 31.7   Lynx_330 Lynx
including 893.3 894.3 1.0 63.0  
OSK-W-19-1193-W2 996.5 999.8 3.3 491 59.9 Lynx_330 Lynx
including 998.0 998.8 0.8 1625 100
OSK-W-19-1272-W3 768.0 789.3 21.3 6.65   Triple Lynx Triple Lynx
including 780.9 783.7 2.8 11.8  
OSK-W-19-1419-W1 807.9 812.2 4.3 14.0   Lynx_333 Lynx
including 809.0 809.7 0.7 35.4  
OSK-W-19-1711-W3 1136.0 1138.0 2.0 6.14   Lynx_327 Lynx
including 1137.7 1138.0 0.3 35.7  
OSK-W-19-1857-W7 1371.0 1373.4 2.4 23.1   Lynx 4 Lynx
including 1372.4 1372.9 0.5 65.7  
  1421.0 1423.0 2.0 10.0   Lynx 4 Lynx
including 1421.0 1422.0 1.0 19.9  
OSK-W-19-1891-W4 576.7 579.3 2.6 4.16   Lynx_315 Lynx
  587.5 589.7 2.2 6.06   Lynx_315 Lynx
OSK-W-19-1947 502.1 504.6 2.5 12.8   Lynx_321 Lynx
including 502.1 503.1 1.0 28.2  
  517.5 520.9 3.4 14.1   Lynx_301 Lynx
including 517.5 518.0 0.5 34.7  
OSK-W-19-1948 185.0 188.9 3.9 3.67   Lynx_309 Lynx
OSK-W-19-1949-W3 691.2 696.8 5.6 37.4 23.6 Lynx Lynx
including 692.7 693.8 1.1 170 100
  698.1 700.4 2.3 3.27   Lynx Lynx
  1046.0 1048.0 2.0 138 31.3 Lynx_333 Lynx
including 1046.0 1046.6 0.6 456 100
OSK-W-19-1975-W1 1504.2 1506.6 2.4 5.69   Lynx 4 Ext Lynx
OSK-W-19-1986 952.4 960.6 8.2 3.99   Lynx Lynx
including 956.0 956.7 0.7 12.4  
and 959.4 960.0 0.6 13.5  
OSK-W-19-1991 891.2 893.7 2.5 5.10   Lynx 4 Lynx
OSK-W-19-2012 216.0 218.0 2.0 6.44   Lynx_306 Lynx
including 216.0 216.6 0.6 20.9  
OSK-W-19-2017 385.0 387.0 2.0 17.9   Lynx_322 Lynx
including 386.0 386.5 0.5 70.5  
  415.0 417.0 2.0 6.99   Lynx_301 Lynx
including 415.0 416.0 1.0 13.2  
OSK-W-19-2023 206.0 208.0 2.0 11.5   Lynx_302 Lynx
including 207.0 207.4 0.4 57.1  
OSK-W-19-2025 186.0 188.0 2.0 19.9   Lynx_302 Lynx
including 186.3 187.1 0.8 49.0  
OSK-W-19-2026-W2 927.0 929.3 2.3 9.95   Triple Lynx Triple Lynx
including 928.4 928.7 0.3 38.4  
  973.0 975.0 2.0 5.98   Triple Lynx Triple Lynx
  982.6 987.0 4.4 8.71   Triple Lynx Triple Lynx
including 983.0 984.1 1.1 24.7  
  1000.3 1004.2 3.9 13.7   Triple Lynx Triple Lynx
including 1003.7 1004.2 0.5 62.7  
  1034.0 1036.4 2.4 35.7   Triple Lynx Triple Lynx
including 1034.6 1035.4 0.8 99.8  
  1052.6 1054.6 2.0 9.27   Triple Lynx Triple Lynx
including 1054.3 1054.6 0.3 32.4  
  1083.0 1085.0 2.0 6.97   Triple Lynx Triple Lynx
including 1083.0 1083.3 0.3 41.8  
OSK-W-19-2026-W3 936.0 938.1 2.1 5.08   Triple Lynx Triple Lynx
  987.0 989.0 2.0 4.40   Triple Lynx Triple Lynx
  1059.0 1063.0 4.0 12.7   Triple Lynx Triple Lynx
OSK-W-19-2035 554.1 556.5 2.4 3.24   Lynx_301 Lynx
  743.0 745.3 2.3 7.82   Lynx 4 Lynx
including 744.1 744.8 0.7 24.9  
OSK-W-19-2041-W1 1099.0 1106.0 7.0 3.88   Triple Lynx Triple Lynx
  1109.0 1113.8 4.8 14.8 13.2 Triple Lynx Triple Lynx
including 1109.0 1109.5 0.5 116 100
  1131.9 1134.8 2.9 5.88   Triple Lynx Triple Lynx
OSK-W-19-2044 143.2 147.3 4.1 10.9   Lynx corridor Lynx
  192.0 194.0 2.0 33.7   Lynx_344 Lynx
OSK-W-19-2061 155.7 158.0 2.3 3.73   Lynx corridor Lynx
  252.0 254.3 2.3 5.17   Lynx_335 Lynx
OSK-W-19-2067-W1 1102.5 1105.0 2.5 21.8   Triple Lynx Triple Lynx
including 1104.3 1105.0 0.7 51.6  
  1120.3 1122.3 2.0 8.20   Triple Lynx Triple Lynx
including 1121.1 1121.4 0.3 37.7  
  1127.1 1129.1 2.0 8.38   Triple Lynx Triple Lynx
including 1127.1 1127.4 0.3 51.9  
  1140.1 1142.2 2.1 47.9 14.7 Triple Lynx Triple Lynx
including 1141.9 1142.2 0.3 332 100
OSK-W-19-2067-W2 924.3 926.4 2.1 3.38   Triple Lynx Triple Lynx
  933.0 935.0 2.0 4.02   Triple Lynx Triple Lynx
  937.7 940.0 2.3 3.71   Triple Lynx Triple Lynx
  945.0 948.0 3.0 3.74   Triple Lynx Triple Lynx
  957.4 960.6 3.2 17.8   Triple Lynx Triple Lynx
  1029.0 1031.3 2.3 14.6   Triple Lynx Triple Lynx
OSK-W-19-2068-W1 885.5 887.7 2.2 5.63   Lynx_313 Lynx
  942.5 944.5 2.0 3.93   Lynx_327 Lynx
  993.0 995.0 2.0 4.32   Lynx_312 Lynx
OSK-W-19-2068-W2 853.8 861.8 8.0 161 69.7 Lynx_313 Lynx
including 856.5 857.0 0.5 282 100
and 857.6 858.8 1.2 488 100
and 861.2 861.8 0.6 345 100
  934.7 936.8 2.1 6.54   Lynx_312 Lynx
including 934.7 935.3 0.6 18.2  
  967.0 969.0 2.0 3.76   Lynx Lynx
OSK-W-19-2068-W3 893.5 896.0 2.5 22.3   Lynx_313 Lynx
OSK-W-19-2077 808.0 810.0 2.0 15.0   Triple Lynx Triple Lynx
including 808.6 809.0 0.4 69.5  
OSK-W-19-2084-W1 703.4 706.0 2.6 38.4   Lynx Lynx
including 704.3 705.0 0.7 69.7  
and 705.5 706.0 0.5 68.2  
OSK-W-19-2100 980.0 982.1 2.1 3.96   Triple Lynx Triple Lynx
  989.0 991.6 2.6 8.06   Triple Lynx Triple Lynx
including 989.0 990.0 1.0 18.6  
OSK-W-19-2107 581.1 593.7 12.6 3.93   Lynx Lynx
including 584.0 586.0 2.0 7.62  
  690.6 693.5 2.9 3.52   Triple Lynx Triple Lynx
  699.0 701.1 2.1 3.67   Triple Lynx Triple Lynx
including 699.9 700.2 0.3 22.2  

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See "Quality Control and Reporting Protocols" below. Ext = Extension.

Underground Drilling

Hole No. From
(m)
To
(m)
Interval
(m)
Au (g/t)
uncut
Au (g/t)
cut to
100 g/t
Zone Corridor
WST-19-0152 52.3 55.2 2.9 3.89   Lynx_308 Lynx
including 52.3 52.7 0.4 15.1  
WST-19-0166 73.0 75.0 2.0 4.66   Lynx_305 Lynx
including 73.4 73.9 0.5 17.7  
WST-19-0207 75.6 78.0 2.4 10.6   Lynx_309 Lynx
including 76.8 77.1 0.3 76.8  
WST-19-0209 72.4 75.1 2.7 267 65.5 Lynx_307 Lynx
including 74.0 74.5 0.5 966 100
WST-19-0211 77.0 81.0 4.0 5.21   Lynx_307 Lynx
WST-19-0212 86.2 88.3 2.1 23.5 19.4 Lynx_311 Lynx
including 87.4 87.8 0.4 122 100
WST-19-0215 162.2 164.6 2.4 53.9 22.4 Lynx_311 Lynx
including 162.2 162.7 0.5 251 100
WST-19-0229 68.8 70.9 2.1 4.54   Lynx_311 Lynx
including 70.6 70.9 0.3 28.7  
  76.6 78.6 2.0 5.34   Lynx_308 Lynx
including 77.5 78.2 0.7 11.4  
WST-19-0230 129.9 132. 2.1 4.91   Lynx_306 Lynx
including 130.8 131.2 0.4 25.3  
  146.0 148.5 2.5 3.57   Lynx_323 Lynx

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See "Quality Control and Reporting Protocols" below. Ext = Extension.

Drill hole location

Hole Number Azimuth
(°)
Dip
(°)
Length
(m)
UTM E UTM N Elevation Section
OSK-W-17-1272 127 -60 1409 453246 5435535 412 3675
OSK-W-18-1560-W2 145 -53 876 453373 5435483 404 3775
OSK-W-18-1582 143 -50 1248 453279 5435516 410 3700
OSK-W-18-1687 141 -50 1043 453344 5435502 408 3750
OSK-W-19-923-W4 137 -56 1035 453607 5435603 405 4025
OSK-W-19-1193-W2 141 -59 1095 453807 5435721 400 4275
OSK-W-19-1272-W3 127 -60 1164 453246 5435535 412 3675
OSK-W-19-1419-W1 137 -49 906 453453 5435560 408 3875
OSK-W-19-1711-W3 134 -52 1233 453367 5435556 413 3800
OSK-W-19-1857-W7 108 -58 1460 453525 5435704 405 4000
OSK-W-19-1891-W4 135 -52 666 453513 5435472 399 3875
OSK-W-19-1947 137 -46 633 453412 5435463 401 3775
OSK-W-19-1948 121 -45 489 453286 5435277 400 3600
OSK-W-19-1949-W3 105 -57 1326 453440 5435479 401 3825
OSK-W-19-1975-W1 119 -58 1560 453768 5435892 402 4300
OSK-W-19-1986 46 -75 1085 453352 5434424 398 3225
OSK-W-19-1991 358 -46 1266 453561 5434349 398 3375
OSK-W-19-2012 359 -69 321 453482 5435045 396 3650
OSK-W-19-2017 149 -46 471 453466 5435433 399 3825
OSK-W-19-2023 157 -49 243 452825 5434978 406 3050
OSK-W-19-2025 157 -51 276 452977 5435033 408 3200
OSK-W-19-2026-W2 123 -56 1208 453214 5435642 414 3700
OSK-W-19-2026-W3 123 -56 1182 453214 5435642 414 3700
OSK-W-19-2035 134 -51 780 453421 5435432 400 3775
OSK-W-19-2041-W1 118 -49 1350 453231 5435774 408 3775
OSK-W-19-2044 158 -48 441 452820 5435006 406 3050
OSK-W-19-2061 150 -48 468 452783 5435007 407 3025
OSK-W-19-2067-W1 123 -53 1302 453241 5435696 415 3750
OSK-W-19-2067-W2 123 -53 1159 453241 5435696 415 3750
OSK-W-19-2068-W1 116 -53 1049 453316 5435389 403 3675
OSK-W-19-2068-W2 116 -53 1046 453316 5435389 403 3675
OSK-W-19-2068-W3 116 -53 1022 453316 5435389 403 3675
OSK-W-19-2077 127 -57 1123 453147 5435489 418 3575
OSK-W-19-2084-W1 120 -58 1200 453439 5435575 410 3875
OSK-W-19-2100 122 -47 1110 453093 5435726 419 3650
OSK-W-19-2107 23 -70 1095 453423 5434778 396 3475
WST-19-0152 154 -27 121 453290 5435116 204 3525
WST-19-0166 130 -5 121 453290 5435116 205 3525
WST-19-0207 147 -12 139 453178 5435126 174 3425
WST-19-0209 147 -30 130 453178 5435126 173 3425
WST-19-0211 172 14 151 453177 5435125 175 3425
WST-19-0212 131 -13 166 453178 5435126 174 3425
WST-19-0215 144 20 184 453178 5435127 175 3425
WST-19-0229 140 11 112 453215 5435114 222 3450
WST-19-0230 161 20 151 453215 5435114 223 3450

OSK-W-17-1272 intersected 12.4 g/t Au over 2.9 metres in Triple Lynx. Mineralization consists of trace disseminated pyrite in a moderate silica and weak sericite altered rhyolite.

OSK-W-18-1560-W2 intersected 4.51 g/t Au over 11.1 metres in Lynx. Mineralization consists of local visible gold, 5% pyrite stringers and clusters, and trace sphalerite hosted at the contact between a moderate chlorite altered gabbro and a moderate sericite altered rhyolite.

OSK-W-18-1582 intersected 13.6 g/t Au over 3.1 metres in Lynx. Mineralization consists of 5% disseminated pyrite, 2% pyrite stringers, 5% pyrite with ptygmatic quartz-tourmaline veinlets, and irregular quartz veinlets at the contact between a moderated fuchsite altered gabbro and moderate silica-sericite altered rhyolite.

OSK-W-18-1867 intersected 46.1 g/t Au over 2.1 metres in Lynx. Mineralization consists of 7% pyrite stringers and clusters and 1% pyrite with quartz-tourmaline veins hosted in a strongly sericitized and weakly fuchsitized andesite.

OSK-W-19-923-W4 intersected 31.7 g/t Au over 2.0 metres in Lynx. Mineralization consists of local visible gold, 15% disseminated and stringer pyrite, 2% chalcopyrite and trace sphalerite within a moderate sericite and weak fuchsite altered rhyolite.

OSK-W-19-1193-W2 intersected 491 g/t Au over 3.3 metres in Lynx. Mineralization consists of local visible gold and native silver, 2% pyrite-tourmaline veinlets, 10% disseminated pyrite, 1% pyrite clusters, and trace chalcopyrite clusters with quartz-tourmaline veins hosted in a weakly brecciated, moderately silicified and moderately sericitized felsic intrusion.

OSK-W-19-1272-W3 intersected 6.65 g/t Au over 21.3 metres in Triple Lynx. Mineralization consists of 8% disseminated, clustered and stringer pyrite hosted in a moderately sericitized and silicified rhyolite with strongly sericitized gabbro enclaves with local fuchsite.

OSK-W-19-1419-W1 intersected 14.0 g/t Au over 4.3 metres in Lynx. Mineralization consists of quartz crustiform veins with trace disseminate pyrite hosted at a weak sericite and silica altered contact between a rhyolite and a porphyritic felsic dike.

OSK-W-19-1711-W3 intersected 6.14 g/t Au over 2.0 metres in Lynx. Mineralization consists of 1% disseminated pyrite and trace sphalerite within a weak sericite and silica altered rhyolite.

OSK-W-19-1857-W7 intersected 23.1 g/t Au over 2.4 metres in Lynx and 10.0 g/t Au over 2.0 metres in Lynx Extension. The first interval consists of up to 8% disseminated, stringer, and clustered pyrite associated with pervasive silica flooding hosted in a weak sericite altered rhyolite. The second interval consists of trace disseminated and clustered pyrite within a moderate sericite and weak silica altered porphyritic felsic dike.

OSK-W-19-1891-W4 intersected 4.16 g/t Au over 2.6 metres and 6.06 g/t Au over 2.2 metres in Lynx. Both intervals consist of 2% disseminated and clustered pyrite with local smoky silica flooding, ptygmatic tourmaline veinlets and quartz-carbonate veinlets hosted in a sericitized rhyolite in contact with a fuchsitized gabbro.

OSK-W-19-1947 intersected 12.8 g/t Au over 2.5 metres and 14.1 g/t Au over 3.4 metres in Lynx. Both intervals consist of up to 7% disseminated, stringer, and clustered pyrite within a strong fuchsite and sericite altered gabbro.

OSK-W-19-1948 intersected 3.67 g/t Au over 3.9 meters in Lynx. Mineralization consists of 2% pyrite clusters in a moderate silica and weak sericite altered fragmental felsic dike.

OSK-W-19-1949-W3 intersected 37.4 g/t Au over 5.6 metres, 3.27 g/t Au over 2.3 metres and 138 g/t Au over 2.0 metres in Lynx. The first interval consists of local visible gold and 5% pyrite clusters with smoky quartz veins in a moderate sericite altered rhyolite. The second interval consists of 3% clustered, stringer, and disseminated pyrite in a moderate sericite and strong fuchsite altered gabbro. The third interval consist of local visible gold with 3% disseminated, stringer, and clustered pyrite with quartz-tourmaline veins, silica flooding and ptygmatic tourmaline veins in a strong silica and sericite altered rhyolite.

OSK-W-19-1975-W1 intersected 5.69 g/t Au over 2.4 metres in Lynx. Mineralization consists of up to 10% disseminated and clustered pyrite in a weakly to moderately silicified and weakly bleached andesite.

OSK-W-19-1986 intersected 3.99 g/t Au over 8.2 metres in Lynx. Mineralization consists of up to 5% disseminated, clustered, and stringer pyrite and 1% sphalerite hosted in a moderate silica altered porphyritic felsic intrusion.

OSK-W-19-1991 intersected 5.10 g/t Au over 2.5 metres in Lynx. Mineralization consists of 15% pyrite stringers, 10% pyrite clusters, and 5% disseminated pyrite at the contact between a strongly bleached, moderately sericitized, and weakly silicified gabbro and an andesite.

OSK-W-19-2012 intersected 6.44 g/t Au over 2.0 metres in Lynx. Mineralization consists of trace pyrite stringers and clusters with quartz veins in a weakly sericitized and silicified rhyolite with moderate chlorite alteration.

OSK-W-19-2017 intersected 17.9 g/t Au over 2.0 metres and 6.99 g/t Au over 2.0 metres in Lynx. The first interval consists of 3% clustered and stringer pyrite associated with pervasive silica flooding and 3% ptygmatic quartz-tourmaline veins hosted at the contact between a moderate fuchsite altered gabbro and a weak sericite altered porphyritic felsic dike. The second interval consists of trace pyrite stringers associated with pervasive silica flooding hosted in a moderate sericite altered rhyolite.

OSK-W-19-2023 intersected 11.5 g/t Au over 2.0 metres in Lynx. Mineralization consists of local visible gold, 10% pyrite stringers, and 3% pyrite clusters hosted in a moderate silica altered porphyritic felsic intrusion.

OSK-W-19-2025 intersected 19.9 g/t Au over 2.0 metres in Lynx. Mineralization consists of 2% disseminated pyrite associated with quartz-tourmaline veins and up to 5% pyrite clusters hosted in moderate silica altered porphyritic dike.

OSK-W-19-2026-W2 intersected seven intervals in Triple Lynx: 9.95 g/t Au over 2.3 metres, 5.98 g/t Au over 2.0 metres, 8.71 g/t Au over 4.4 metres, 13.7 g/t Au over 3.9 metres, 35.7 g/t Au over 2.4 metres, 9.27 g/t Au over 2.0 metres and 6.97 g/t Au over 2.0 metres. The first interval consists of 1% pyrite stringers associated with ptygmatic tourmaline veins hosted in a weakly sericitized and chloritized rhyolite. The second interval consists of trace disseminated pyrite within a weak sericite altered rhyolite. The third interval consists of 5% pyrite clusters and stringers in a weakly sericitized and bleached gabbro in contact with a rhyolite. The fourth interval consists of 10% disseminated pyrite with a smoky quartz vein in a moderate silica and weak sericite altered rhyolite. The fifth interval consists of up to 7% pyrite stringers within a weak sericite altered rhyolite. The sixth interval consists of up to 25% pyrite and 3% sphalerite associated with smoky quartz veins hosted in a moderate chlorite altered porphyritic felsic intrusion. The last interval consists of local visible gold, up to 15% pyrite stringers and 1% sphalerite within a moderate silica altered and weak chlorite altered rhyolite.

OSK-W-19-2026-W3 intersected 5.08 g/t Au over 2.1 metres, 4.40 g/t Au over 2.0 metres and 12.7 g/t Au over 4.0 metres in Triple Lynx. The first interval consists of 1% disseminated or semi-massive centimetric bands of pyrite in a moderate silica and weak sericite altered porphyritic felsic dike. The second interval consists of 5% disseminated and stringer pyrite in fracture filling in a weak silica and sericite altered rhyolite. The last interval consists of trace disseminated pyrite and 1% pyrite with ptygmatic tourmaline veins in a weakly sericite and silica altered porphyritic felsic dike.

OSK-W-19-2035 intersected 3.24 g/t Au over 2.4 metres and 7.82 g/t Au over 2.3 metres in Lynx. The first interval consists of 10% disseminated pyrite in a moderate fuchsite, silica and weak sericite altered gabbro. The second interval consists of 3% disseminated and clustered pyrite in a weak sericite and moderate silica altered rhyolite.

OSK-W-19-2041-W1 intersected 3.88 g/t Au over 7.0 metres, 14.8 g/t Au over 4.8 metres and 5.88 g/t Au over 2.9 metres in Triple Lynx. The first interval consists of 1% disseminated pyrite and 1% pyrite-tourmaline stringers in a weak silica and moderate sericite altered rhyolite. The second interval consists of local visible gold, 25% disseminated pyrite with tourmaline in a smoky-quartz vein, and 3% disseminated, clustered and stringer pyrite in a sericitized and silica altered rhyolite. The third interval consists of 1% disseminated pyrite and 1% massive pyrite veins in a moderate silica and sericite altered rhyolite.

OSK-W-19-2044 intersected 10.9 g/t Au over 4.1 metres and 33.7 g/t Au over 2.0 metres in Lynx. The first interval consists of 15% disseminated and stringer pyrite and 5% sphalerite associated with quartz-carbonate veins hosted in a moderate silica altered porphyritic felsic intrusion. The second interval consists of up to 10% pyrite stringers and clusters hosted in a weak silica and fuchsite altered gabbro.

OSK-W-19-2061 intersected 3.73 g/t Au over 2.3 metres and 5.17 g/t Au over 2.3 metres in Lynx. The first interval consists of up to 10% pyrite associated with quartz-carbonate veins within a moderate sericite and weak silica altered felsic intrusion. The second interval consists of up to 10% pyrite stringers within a weak silica, sericite and fuchsite altered porphyritic felsic dike.

OSK-W-19-2067-W1 intersected four intervals in Triple Lynx: 21.8 g/t Au over 2.5 metres, 8.20 g/t Au over 2.0 metres, 8.38 g/t Au over 2.0 metres and 47.9 g/t Au over 2.1 metres. The first interval consists of up to 7% pyrite clusters and up to 4% pyrite stringers within a moderately bleached gabbro. The second interval consists of 5% pyrite stringers and 15% crustiform veins hosted in a weak silica and sericite altered rhyolite. The third interval consists of local visible gold and 2% pyrite stringers associated with smoky quartz veins hosted in a weak silica and sericite altered rhyolite. The last interval consists of local visible gold, 2% pyrite stringers and quartz-carbonate veins within a weak silica altered rhyolite.

OSK-W-19-2067-W2 intersected six intervals in Triple Lynx: 3.38 g/t Au over 2.1 metres, 4.02 g/t Au over 2.0 metres, 3.71 g/t Au over 2.3 metres, 3.74 g/t Au over 3.0 metres, 17.8 g/t Au over 3.2 metres and 14.6 g/t Au over 2.3 metres. The first to fourth intervals consist of 1% disseminated or stringer pyrite within a weakly to moderately silicified and moderately sericitized rhyolite. The fifth interval consists of local visible gold in a pervasive silica zone with 20% disseminated or stringer pyrite in a moderate silica and sericite altered rhyolite in contact with moderate chlorite and sericite altered gabbro with 5% disseminated or fracture filling pyrite. The last interval consists of local visible gold and 10% disseminated pyrite with ptygmatic tourmaline veins in a moderate to strongly silicified and sericitized rhyolite.

OSK-W-19-2068-W1 intersected three intervals in Lynx: 5.63 g/t Au over 2.2 metres, 3.93 g/t Au over 2.0 metres and 4.32 g/t Au over 2.0 metres. The first interval consists of up to 5% pyrite stringers associated with ptygmatic tourmaline veins and trace chalcopyrite within a weakly chloritized basalt. The second interval consists of 5% quartz-tourmaline veins and trace chalcopyrite within a weak sericite and silica altered basalt. The last interval consists of trace disseminated and stringer pyrite within a moderate chlorite altered and weak sericite altered basalt.

OSK-W-19-2068-W2 intersected 161 g/t Au over 8.0 metres, 6.54 g/t Au over 2.1 metres and 3.76 g/t Au over 2.0 metres in Lynx. The first interval consists of local visible gold, local native silver, 15% disseminated pyrite, 1% disseminated sphalerite, and 1% disseminated chalcopyrite with silica flooding with local fuchsite hosted in a moderate sericite and strong silica altered rhyolite. The second interval consists of local visible gold, trace sphalerite with silica flooding, 3% pyrite clusters and stringers, and 1% disseminated pyrite in a strong silica and sericite altered rhyolite in contact with a locally fuchsitized gabbro. The last interval is composed of 2% pyrite stringers and clusters within a moderate sericite rhyolite.  

OSK-W-19-2068-W3 intersected 22.3 g/t Au over 2.5 metres in Lynx. Mineralization consists of 2% pyrite clusters and 1% pyrite-tourmaline stringers hosted in a moderately sericitized, silicified and weakly fuchsitized rhyolite.

OSK-W-19-2077 intersected 15.0 g/t Au over 2.0 metres in Triple Lynx. Mineralization consists of local visible gold in quartz-tourmaline veins and 5% disseminated pyrite hosted in a strong silica and weak sericite altered rhyolite.

OSK-W-19-2084-W1 intersected 38.4 g/t Au over 2.6 metres in Lynx. Mineralization consists of local visible gold, 3% pyrite clusters and stringers associated with ptygmatic tourmaline veins hosted in a strong silica, moderate sericite and fuchsite altered gabbro.

OSK-W-19-2100 intersected 3.96 g/t Au over 2.1 metres and 8.06 g/t Au over 2.6 metres in Triple Lynx. Mineralization in both intervals consists of 1% pyrite stringers and trace pyrite with quartz-carbonates veins in weak to moderate sericite rhyolite.  

OSK-W-19-2107 intersected 3.93 g/t Au over 12.6 metres, 3.52 g/t Au over 2.9 metres and 3.67 g/t Au over 2.1 metres in Triple Lynx. The first interval consists of 7% disseminated and clustered pyrite, and trace sphalerite clusters in a weakly sericitized and moderately silicified porphyritic felsic dike. The second and third intervals consists of 1% pyrite stringers and trace disseminated pyrite in a moderately chloritized and weakly sericitized porphyritic felsic dike.

WST-19-0152 intersected 3.89 g/t Au over 2.9 metres in Lynx. Mineralization consists of local visible gold and 15% pyrite with pervasive silica flooding in a moderate silica altered rhyolite. WST-19-0152 was drilled from underground drill station BM-200-285-S located 285 metres below surface from section 3525E.

WST-19-0166 intersected 4.66 g/t Au over 2.0 metres in Lynx. Mineralization consists of 5% pyrite stringers associated with pervasive silica flooding in a fragmental felsic intrusion. WST-19-0166 was drilled from underground drill station BM-200-285-S located 285 metres below surface from section 3525E.

WST-19-0207 intersected 10.6 g/t Au over 2.4 metres in Lynx. Mineralization consists of local visible gold in a smoky quartz vein, 6% disseminated pyrite and 4% pyrite clusters hosted in a weakly sericitized rhyolite. WST-19-0207 was drilled from underground drill station AN-225-190-O located 225 metres below surface from section 3425E.

WST-19-0209 intersected 267 g/t Au over 2.7 metres in Lynx. Mineralization consists of local visible gold, up to 4% disseminated pyrite, and 1% trace sphalerite within a quartz-tourmaline vein hosted in a weak sericite altered rhyolite. WST-19-0209 was drilled from underground drill station AN-225-190-O located 225 metres below surface from section 3425E.

WST-19-0211 intersected 5.21 g/t Au over 4.0 metres in Lynx. Mineralization consists of finely disseminated pyrite and trace sphalerite associated with smoky quartz veins hosted in a sericitized rhyolite. WST-19-0211 was drilled from underground drill station AN-225-190-O located 225 metres below surface from section 3425E.

WST-19-0212 intersected 23.5 g/t Au over 2.1 metres in Lynx. Mineralization consists of local visible gold with quartz crustiform veins, 8% pyrite clusters, and trace sphalerite hosted in a moderate silica altered rhyolite. WST-19-0212 was drilled from underground drill station AN-225-190-O located 225 metres below surface from section 3425E.

WST-19-0215 intersected 53.9 g/t Au over 2.4 metres in Lynx. Mineralization consists of local visible gold in a crustiform quartz-carbonate vein, 6% disseminated pyrite and 3% pyrite clusters hosted at the contact between a weakly sericitized rhyolite and a gabbro. WST-19-0215 was drilled from underground drill station AN-225-190-O located 225 metres below surface from section 3425E.

WST-19-0229 intersected 4.54 g/t Au over 2.1 metres and 5.34 g/t Au over 2.0 metres in Lynx. The first interval consists of 3% disseminated pyrite, 2% sphalerite within quartz-fuchsite veins, and 2% pyrite clusters hosted in a moderately sericitized porphyritic felsic dike. The second interval consists of 3% pyrite clusters and pyrite-tourmaline stringers, and 10% pyrite within a quartz vein hosted in a moderately sericitized-silicified porphyritic felsic dike. WST-19-0229 was drilled from underground drill station RA-180-190-E located 180 metres below surface from section 3450E.

WST-19-0230 intersected 4.91 g/t Au over 2.1 metres and 3.57 g/t Au over 2.5 metres in Lynx. Mineralization consists of 10% pyrite clusters and stringers in a moderate sericite altered rhyolite. WST-19-0230 was drilled from underground drill station RA-180-190-E located 180 metres below surface from section 3450E.

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

Quality Control and Reporting Protocols
True width determination is estimated at 55-80% of the reported core length interval for the zone. Assays are uncut except where indicated. Intercepts occur within geological confines of major zones but have not been correlated to individual vein domains at this time. Reported intervals include minimum weighted averages of 3.0 g/t Au diluted over core lengths of at least 2.0 metres. All NQ core assays reported were obtained by either 1-kilogram screen fire assay or standard 50-gram fire-assaying-AA finish or gravimetric finish at (i) ALS Laboratories in Val d'Or, Québec, Thunder Bay, Ontario, Sudbury, Ontario or Vancouver, British Colombia, or (ii) Bureau Veritas in Timmins, Ontario. The 1-kilogram screen assay method is selected by the geologist when samples contain coarse gold or present a higher percentage of pyrite than surrounding intervals. Selected samples are also analyzed for multi-elements, including silver, using an Aqua Regia-ICP-AES method at ALS Laboratories. Drill program design, Quality Assurance/Quality Control ("QA/QC") and interpretation of results is performed by qualified persons employing a QA/QC program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the Corporation as well as the lab. Approximately 5% of sample pulps are sent to secondary laboratories for check assay.

About the Windfall 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 Osisko, as disclosed in the Windfall Lake Technical Report (as defined below) and November 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, Québec (the "Windfall Lake Technical Report") and the press release “Osisko Releases Mineral Resource Update for Lynx” dated November 27, 2018, which has been prepared by Osisko and reviewed and approved by Micon International, Ltd. from Toronto, Ontario. The Windfall Lake Technical Report and press release are available on Osisko's website at www.osiskomining.com and on SEDAR under Osisko's issuer profile at www.sedar.com. 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 sub-vertical 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% interest 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 the Urban Barry area and nearby Quévillon area (over 2,700 square kilometres).

Cautionary Note Regarding Forward-Looking Information
This news release contains "forward-looking information" within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. 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 significance of results from the new infill drilling and ongoing drill definition and expansion program at the Windfall Lake gold project; the significance of assay results presented in this news release; the deposit remaining open along strike and at depth; potential depth extensions of the mineralized zones down-plunge and at depth; the actual mineralization of local visible gold; the current drill program; the type of drilling included in the drill program; 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 such assumptions and estimates were made, and 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.

For further information please contact:
John Burzynski
President and Chief Executive Officer
Telephone: (416) 363-8653