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Osisko Windfall Drilling Continues to Intercept High-Grade Across the Windfall Deposit

576 g/t Au over 2.7 metres in Triple Lynx

93.1 g/t Au over 3.0 metres in Caribou

22.3 g/t Au over 4.4 metres in Underdog

TORONTO, Dec. 02, 2021 (GLOBE NEWSWIRE) -- Osisko Mining Inc. (OSK:TSX. "Osisko" or the "Corporation") is pleased to provide new analytical results from the ongoing drill program at its 100% owned Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec.

Significant new analytical results presented below include 135 intercepts in 37 drill holes (18 from surface, 19 from underground) and 22 wedges. The infill intercepts are located inside defined February 2021 mineral resource estimate (“MRE”) blocks (see Osisko news release dated February 17, 2021). The expansion intercepts are located outside the February 2021 MRE blocks and either expand resource wireframes or are in a defined zone or corridor but do not yet correlate to a specific wireframe.

Osisko Chief Executive Officer John Burzynski commented: “Though the main infill drill campaign at Windfall has been successfully completed in support of the upcoming mineral resource estimate update, we continue with targeted infill and expansion drilling. Today’s results are part of this continuing program and clearly demonstrate Windfall’s growth upside, especially the expansion results.”

Selected high-grade intercepts include: 576 g/t Au over 2.7 metres, 17.6 g/t Au over 10.6 metres and 15.7 g/t Au over 8.1 metres in OSK-W-21-2587; 221 g/t Au over 2.0 metres in WST-21-0877; 127 g/t Au over 2.6 metres in OSK-W-21-2537-W3; 93.1 g/t Au over 3.0 metres in OSK-W-21-2606; 28.6 g/t Au over 4.9 metres in OSK-W-21-2540-W4; 34.7 g/t Au over 3.8 metres in OSK-W-21-1963-W8; 37.4 g/t Au over 3.0 metres in OSK-W-21-1963-W7, 15.4 g/t Au over 6.8 metres in WST-21-0857A and 22.3 g/t Au over 4.4 metres in OSK-W-21-2532-W3. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Infill 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-21-1949-W11 1047.2 1049.6 2.4 3.57   LX4_3430 Lynx 4
  1053.6 1059.0 5.4 5.31   LX4_3434 Lynx 4
OSK-W-21-1963-W7 1331.6 1334.6 3.0 37.4   LX4_3449
Lynx 4
including 1331.6 1332.3 0.7 99.1  
  1345.0 1347.0 2.0 4.96   LX4_3445
Lynx 4
including 1345.6 1346.2 0.6 13.1  
  1374.0 1376.0 2.0 19.8   LX4_3445
Lynx 4
including 1374.7 1375.4 0.7 38.8  
  1378.8 1382.5 3.7 6.39   LX4_3445 Lynx 4
OSK-W-21-1963-W8 1340.7 1344.5 3.8 34.7 26.1 LX4_3449
Lynx 4
including 1341.6 1342.1 0.5 166 100
OSK-W-21-2287-W7 1138.0 1140.2 2.2 4.78   LX4_3453
Lynx 4
including 1139.6 1140.2 0.6 16.5  
  1219.8 1222.0 2.2 6.56   LX4_3449
Lynx 4
including 1220.3 1221.0 0.7 19.7  
OSK-W-21-2287-W9 1237.2 1239.4 2.2 6.50   LX4_3449 Lynx 4
OSK-W-21-2400-W1 672.0 674.0 2.0 3.63   CA1
Caribou
including 672.4 672.7 0.3 23.1  
  762.0 764.0 2.0 4.43   CA2_2208 Caribou
  820.0 822.3 2.3 4.03   CA2_2218 Caribou
OSK-W-21-2416-W7 939.9 944.0 4.1 9.01   TLX_3161
Triple Lynx
including 940.3 941.0 0.7 24.2  
  966.6 969.0 2.4 9.84   TLX_3163 Triple Lynx
  985.0 987.1 2.1 8.85   TLX_3163
Triple Lynx
including 986.0 986.3 0.3 36.3  
  1006.0 1008.1 2.1 6.21   TLX_3164
Triple Lynx
including 1007.8 1008.1 0.3 35.5  
  1051.5 1053.5 2.0 20.2   TLX_3170 Triple Lynx
  1086.0 1089.0 3.0 4.33   TLX_3172 Triple Lynx
  1096.0 1098.2 2.2 7.08   TLX_3193
Triple Lynx
including 1097.1 1097.6 0.5 21.4  
OSK-W-21-2479-W10 464.0 466.0 2.0 4.52   Z27_1203
Zone 27
including 464.7 465.2 0.5 13.2  
  694.1 696.4 2.3 6.32   UDD_4100 Underdog
OSK-W-21-2479-W11 709.7 712.0 2.3 9.08   UDD_4102
Underdog
including 709.7 710.0 0.3 22.5  
and 710.3 710.7 0.4 33.3  
OSK-W-21-2531-W3 635.0 637.6 2.6 5.99   CA2_2206
Caribou
including 636.7 637.6 0.9 13.9  
OSK-W-21-2531-W4 870.6 872.6 2.0 4.42   UDD_4100 Underdog
  1043.5 1045.7 2.2 3.56   UDD_4915 Underdog
  1075.7 1077.7 2.0 3.50   UDD_4501
Underdog
including 1075.7 1076.0 0.3 16.1  
OSK-W-21-2532-W3 909.0 911.0 2.0 7.17   UDD_4106 Underdog
  1036.0 1038.0 2.0 4.23   UDD_4911 Underdog
  1081.6 1086.0 4.4 22.3 20.6 UDD_4513
Underdog
including 1084.7 1085.4 0.7 111 100
  1139.0 1141.0 2.0 6.04   UDD_4512 Underdog
OSK-W-21-2537-W3 908.0 910.6 2.6 127 61.2 TLX_3161
Triple Lynx
including 909.1 910.0 0.9 276 100
OSK-W-21-2551-W4 834.6 836.8 2.2 15.9   LX4_3424
Lynx 4
including 836.3 836.8 0.5 67.7  
  887.6 889.9 2.3 28.9   LX4_3414
Lynx 4
including 889.4 889.9 0.5 90.1  
  900.0 902.0 2.0 3.75   LX4_3437 Lynx 4
  911.0 913.0 2.0 7.13   LX4_3437 Lynx 4
OSK-W-21-2578 156.0 158.0 2.0 14.6   CA1_2505
Caribou
including 157.0 158.0 1.0 28.8  
  165.9 168.0 2.1 9.77   CA1_2505 Caribou
  178.0 180.0 2.0 6.42   CA1_2505 Caribou
OSK-W-21-2578-W2 606.0 608.0 2.0 3.60   UDD_4100 Underdog
OSK-W-21-2587 1042.5 1046.0 3.5 7.33   TLX_3164 Triple Lynx
  1073.0 1077.0 4.0 21.3   TLX_3162
Triple Lynx
including 1075.8 1077.0 1.2 42.9  
  1098.4 1101.1 2.7 576 20.0 TLX_3170
Triple Lynx
including 1100.7 1101.1 0.4 3850 100
  1104.1 1112.2 8.1 15.7   TLX_3170
Triple Lynx
including 1107.7 1108.1 0.4 63.1  
OSK-W-21-2589-W2 736.2 738.5 2.3 34.9   TLX_3171
Triple Lynx
including 737.1 738.0 0.9 88.1  
OSK-W-21-2600 650.3 652.5 2.2 6.14   UDD_4914
Underdog
including 650.3 650.6 0.3 14.2  
OSK-W-21-2606 699.0 702.0 3.0 93.1 63.0 CA2_2208
Caribou
including 700.0 701.0 1.0 191 100
OSK-W-21-2609 638.0 640.0 2.0 6.33   CA2_2237
Caribou
including 638.9 639.5 0.6 16.0  
OSK-W-21-2612 377.0 383.0 6.0 4.71   Z27_1102 Zone 27
OSK-W-21-2615 193.7 195.7 2.0 4.01   WFN_7009 Windfall North
OSK-W-21-2618 207.0 209.0 2.0 5.86   WFN_7009 Windfall North
OSK-W-21-2620 701.0 703.0 2.0 4.59   CAE_2547 Caribou
OSK-W-21-2622 191.4 193.4 2.0 7.29   WFN_7010
Windfall North
including 192.8 193.4 0.6 24.1  
OSK-W-21-2627 57.0 59.0 2.0 20.6   WFN_7003
Windfall North
including 57.6 58.6 1.0 39.9  
WST-21-0649 541.0 543.0 2.0 21.8 16.7 LX4_3450
Lynx 4
including 541.7 542.0 0.3 134 100
WST-21-0784 265.0 267.1 2.1 3.52   TLX_3161
Triple Lynx
including 266.3 266.8 0.5 14.0  
WST-21-0855B 562.7 566.6 3.9 14.0   LX4_3440
Lynx 4
including 566.3 566.6 0.3 58.7  
WST-21-0859 277.3 280.2 2.9 17.5   LSW_3508
Lynx SW
including 278.3 278.7 0.4 66.7  
  347.0 349.0 2.0 29.6 19.5 TLX_3166
Triple Lynx
including 347.9 348.2 0.3 167 100
WST-21-0868A 196.0 198.1 2.1 44.6   TLX_3161 Triple Lynx
  302.0 305.0 3.0 6.14   TLX_3182 Triple Lynx
  336.0 338.0 2.0 5.50   TLX_3131 Triple Lynx
WST-21-0877 79.6 81.6 2.0 4.51   LXM_3339
Lynx
including 80.9 81.6 0.7 12.6  
WST-21-0879 669.5 671.5 2.0 19.6   LX4_3412
Lynx 4
including 669.5 670.5 1.0 39.1  
WST-21-0899C 213.1 215.3 2.2 5.80   LSW_3507 Lynx SW
  313.1 315.4 2.3 6.04   LSW_3556 Lynx SW
WST-21-0901 313.0 315.0 2.0 7.51   LHW_3215 Lynx HW
WST-21-0906A 357.5 359.7 2.2 4.42   LSW_3556 Lynx SW
WST-21-0910A 396.3 399.0 2.7 11.1   LSW_3556
Lynx SW
including 397.9 398.6 0.7 30.1  

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See "Quality Control and Reporting Protocols" below. CA1 and CA2 = Caribou, LX4 = Lynx 4, LHW = Lynx Hanging Wall, LXM = Lynx Main, LSW = Lynx Southwest, TLX = Triple Lynx, UDD = Underdog, WNF = Windfall North and Z27 = Zone 27.


Expansion 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-21-1871-W1 844.0 846.0 2.0 5.55   UDD Underdog
OSK-W-21-1949-W11 1028.1 1030.2 2.1 17.6   LX4
Lynx 4
including 1029.2 1029.6 0.4 72.0  
  1068.0 1071.4 3.4 3.66   LX4 Lynx 4
  1101.7 1103.8 2.1 4.73   LX4
Lynx 4
including 1102.4 1102.7 0.3 22.9  
OSK-W-21-2287-W9 943.6 945.6 2.0 4.57   LX4

Lynx 4
including 943.6 944.1 0.5 18.2  
OSK-W-21-2416-W6 986.0 988.3 2.3 9.75   TLX Triple Lynx
OSK-W-21-2479-W11 470.7 472.8 2.1 8.28   Z27
Zone 27
including 470.7 471.1 0.4 27.5  
  773.0 775.2 2.2 5.95   UDD Underdog
  879.7 882.0 2.3 6.37   UDD
Underdog
including 879.7 880.4 0.7 20.5  
OSK-W-21-2522-W4 754.0 756.2 2.2 6.14   Lynx Lynx
OSK-W-21-2532-W3 691.9 694.0 2.1 12.6   UDD
Underdog
including 691.9 692.8 0.9 28.7  
  1089.0 1091.0 2.0 15.0   UDD
Underdog
including 1089.4 1090.0 0.6 37.7  
OSK-W-21-2540-W4 978.7 983.6 4.9 28.6   TLX
Triple Lynx
including 983.0 983.6 0.6 74.9  
OSK-W-21-2540-W5 936.0 940.8 4.8 11.0   TLX Triple Lynx
OSK-W-21-2540-W6 931.0 933.2 2.2 9.62   TLX Triple Lynx
OSK-W-21-2548 235.5 238.5 3.0 3.70   BCT Bobcat
  252.3 254.5 2.2 3.64   BCT Bobcat
  358.0 360.1 2.1 4.19   BCT Bobcat
OSK-W-21-2578 376.8 380.3 3.5 10.6   Z27 Zone 27
  691.1 693.2 2.1 10.8   UDD
Underdog
including 692.6 692.9 0.3 67.0  
OSK-W-21-2578-W2 590.0 592.0 2.0 7.84   UDD
Underdog
including 590.0 590.8 0.8 19.0  
  706.0 709.2 3.2 6.00   UDD Underdog
  917.9 920.1 2.2 4.10   UDD
Underdog
including 919.3 919.6 0.3 27.8  
OSK-W-21-2587 978.4 989.0 10.6 17.6 17.6 TLX
Triple Lynx
including 982.3 983.0 0.7 101 100
and 983.0 983.7 0.7 77.2  
  1054.0 1056.0 2.0 5.53   TLX Triple Lynx
  1060.0 1062.0 2.0 9.86   TLX
Triple Lynx
including 1061.0 1062.0 1.0 18.3  
OSK-W-21-2593 696.4 698.5 2.1 7.44   LX4
Lynx 4
including 696.4 697.0 0.6 17.9  
OSK-W-21-2595 343.7 346.3 2.6 12.0   CAE
Caribou
including 345.9 346.3 0.4 52.1  
  456.0 458.0 2.0 5.39   CAE
Caribou
including 457.2 457.6 0.4 26.4  
  527.7 530.1 2.4 8.50   CAE
Caribou
including 528.1 528.7 0.6 24.9  
  559.0 561.0 2.0 5.68   CAE
Caribou
including 559.3 559.9 0.6 16.2  
  568.8 571.3 2.5 7.32   CAE
Caribou
including 570.9 571.3 0.4 17.5  
  646.5 648.5 2.0 9.53   CAE
Caribou
including 646.5 647.0 0.5 36.0  
  651.0 653.2 2.2 24.7   CAE
Caribou
including 652.7 653.2 0.5 98.5  
OSK-W-21-2606 581.0 583.7 2.7 5.99   CAE
Caribou
including 583.1 583.7 0.6 26.8  
OSK-W-21-2609 646.3 648.4 2.1 25.6   CA2
Caribou
including 646.8 647.4 0.6 84.3  
OSK-W-21-2610 534.7 536.7 2.0 4.57   CAE Caribou
OSK-W-21-2612 301.7 303.8 2.1 13.2   Z27 Zone 27
  309.0 311.0 2.0 7.35   Z27 Zone 27
OSK-W-21-2616 208.3 210.3 2.0 4.01   WFN Windfall North
OSK-W-21-2623 170.0 172.0 2.0 5.36   WFN Windfall North
  195.0 197.5 2.5 4.86   WFN
Windfall North
including 196.7 197.5 0.8 13.8  
OSK-W-21-2624 18.0 20.0 2.0 10.8   WFN Windfall North
WST-21-0771C 285.2 287.6 2.4 4.46   LSW Lynx SW
WST-21-0855B 505.5 507.8 2.3 13.0   LX4
Lynx 4
including 505.5 506.2 0.7 30.8  
WST-21-0857A 38.0 40.4 2.4 18.4   LXM
Lynx
including 39.4 40.0 0.6 66.3  
  363.2 370.0 6.8 15.4 14.8 TLX
Triple Lynx
including 363.9 364.6 0.7 106 100
  463.2 465.3 2.1 4.46   TLX
Triple Lynx
including 464.4 465.3 0.9 8.32  
WST-21-0860 245.9 248.1 2.2 5.87   TLX
Triple Lynx
including 246.5 247.0 0.5 24.4  
WST-21-0863 388.0 390.0 2.0 8.66   TLX Triple Lynx
WST-21-0868A 228.0 231.0 3.0 4.31   TLX Triple Lynx
  234.0 236.5 2.5 5.34   TLX Triple Lynx
  241.5 243.5 2.0 5.85   TLX Triple Lynx
  373.6 375.9 2.3 5.88   TLX Triple Lynx
  559.2 561.5 2.3 7.11   LX4 Lynx 4
WST-21-0877 307.7 309.7 2.0 221 15.1 LSW
Lynx SW
including 309.1 309.4 0.3 1475 100
WST-21-0885B 148.5 150.5 2.0 6.49   LSW
Lynx SW
including 149.5 150.5 1.0 13.0  
  296.5 300.5 4.0 12.8   LSW Lynx SW
WST-21-0886 100.6 102.7 2.1 11.8   BCT
Bobcat
including 101.7 102.4 0.7 30.5  
WST-21-0898 391.7 394.7 3.0 28.2   TLX
Triple Lynx
including 392.8 394.0 1.2 61.9  
WST-21-0899B 164.9 167.0 2.1 6.35   LSW Lynx SW
  220.2 225.3 5.1 10.2   LSW
Lynx SW
including 220.2 221.0 0.8 25.8  
WST-21-0899C 372.0 374.0 2.0 8.81   LSW
Lynx SW
including 373.2 373.6 0.4 43.7  
WST-21-0910A 97.2 99.3 2.1 4.04   BCT
Bobcat
including 98.1 98.7 0.6 13.9  
  169.5 171.5 2.0 10.3   LSW
Lynx SW
including 171.0 171.5 0.5 39.0  
  290.0 292.0 2.0 21.2   LSW
Lynx SW
including 290.3 291.0 0.7 55.9  

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See "Quality Control and Reporting Protocols" below. BCT = Bobcat, CAE and CA2 = Caribou, LSW = Lynx Southwest, LXM = Lynx Main, LX4 = Lynx 4, TLX = Triple Lynx, UDD = Underdog, WFN = Windfall North and Z27 = Zone 27.


Drill hole location

Hole Number Azimuth (°) Dip
(°)
Length
(m)
UTM E UTM N Elevation Section
OSK-W-21-1871-W1 331 -56 1119 452496 5434397 402 2475
OSK-W-21-1949-W11 105 -57 1314 453440 5435479 401 3825
OSK-W-21-1963-W7 123 -58 1431 453761 5435816 401 4275
OSK-W-21-1963-W8 123 -58 1452 453761 5435816 401 4275
OSK-W-21-2287-W7 116 -53 1320 453607 5435714 404 4075
OSK-W-21-2287-W9 116 -53 1329 453607 5435714 404 4075
OSK-W-21-2400-W1 336 -53 861 452878 5434419 401 2825
OSK-W-21-2416-W6 123 -54 990 453169 5435624 412 3650
OSK-W-21-2416-W7 123 -54 1104 453169 5435624 412 3650
OSK-W-21-2479-W10 344 -55 807 452315 5434420 399 2325
OSK-W-21-2479-W11 344 -55 1005 452315 5434420 399 2325
OSK-W-21-2522-W4 128 -54 1208 453450 5435592 411 3900
OSK-W-21-2531-W3 344 -62 1329 452566 5434415 403 2550
OSK-W-21-2531-W4 344 -62 1203 452566 5434415 403 2550
OSK-W-21-2532-W3 341 -60 1191 452478 5434430 401 2475
OSK-W-21-2537-W3 114 -54 1024 452981 5435549 420 3450
OSK-W-21-2540-W4 117 -60 1297 453465 5435640 410 3925
OSK-W-21-2540-W5 117 -60 1311 453465 5435640 410 3925
OSK-W-21-2540-W6 117 -60 1541 453465 5435640 410 3925
OSK-W-21-2548 331 -57 774 452832 5434545 398 2850
OSK-W-21-2551-W4 120 -55 1026 453622 5435635 405 4050
OSK-W-21-2578 350 -53 942 452178 5434397 399 2200
OSK-W-21-2578-W2 350 -53 924 452178 5434397 399 2200
OSK-W-21-2587 127 -59 1278 453350 5435673 418 3850
OSK-W-21-2589-W2 130 -49 969 452960 5435539 420 3425
OSK-W-21-2593 18 -76 833 454135 5435058 397 4225
OSK-W-21-2595 150 -60 742 452830 5435324 414 3225
OSK-W-21-2600 329 -50 789 452470 5434626 403 2550
OSK-W-21-2606 325 -61 774 452786 5434526 398 2800
OSK-W-21-2609 338 -62 711 452683 5434351 402 2625
OSK-W-21-2610 153 -62 684 452831 5435324 414 3225
OSK-W-21-2612 333 -51 717 452391 5434638 402 2500
OSK-W-21-2615 338 -60 258 452248 5435150 412 2625
OSK-W-21-2616 341 -56 264 452279 5435163 411 2650
OSK-W-21-2618 330 -56 248 452279 5435162 411 2650
OSK-W-21-2620 145 -59 723 452769 5435312 406 3150
OSK-W-21-2622 328 -63 249 452247 5435150 412 2625
OSK-W-21-2623 336 -50 279 452278 5435162 411 2650
OSK-W-21-2624 351 -47 93 452186 5435122 405 2550
OSK-W-21-2627 155 -45 105 452196 5435179 405 2600
WST-21-0649 136 -47 790 453258 5435211 98 3525
WST-21-0771C 127 -52 357 452954 5435003 252 3175
WST-21-0784 132 -66 361 453507 5435327 -7 3800
WST-21-0855B 118 -45 751 453507 5435333 -48 3800
WST-21-0857A 141 -51 592 453322 5435236 54 3600
WST-21-0859 133 -66 499 453105 5435067 231 3325
WST-21-0860 126 -60 304 453508 5435328 -7 3800
WST-21-0863 135 -64 403 453508 5435327 -7 3800
WST-21-0868A 130 -44 922 453374 5435296 -26 3675
WST-21-0877 158 -60 490 453105 5435065 231 3325
WST-21-0879 139 -44 724 453258 5435209 96 3525
WST-21-0885B 145 -53 377 452954 5435003 253 3175
WST-21-0886 128 -51 375 452954 5435004 253 3175
WST-21-0898 141 -61 402 453508 5435327 -7 3800
WST-21-0899B 134 -60 287 452955 5435004 253 3175
WST-21-0899C 139 -58 434 452955 5435004 252 3175
WST-21-0901 116 -18 340 453462 5435327 32 3775
WST-21-0906A 133 -58 381 453105 5435066 231 3325
WST-21-0910A 143 -63 438 452954 5435004 252 3175

Bobcat
Mineralization most commonly occurs in gold-bearing quartz-pyrite veins controlled by northeast trending faults and shears and to a lesser extent in minor crustiform quartz-tourmaline-ankerite-pyrite veins and pyrite replacement zones and stockwork. Mineralization is hosted in sheared mafic volcanics, rhyolites near faults, or at the contact with felsic porphyritic intrusions.

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

Lynx Zone
Mineralization occurs as grey to translucent quartz-carbonate-pyrite-tourmaline veins and pyrite replacement zones and stockworks. Vein-type mineralization is associated with haloes of pervasive sericite-pyrite ± silica alteration and contain sulphides (predominantly pyrite with minor amounts of chalcopyrite, sphalerite, galena, arsenopyrite, and pyrrhotite) and local visible gold. Replacement mineralization is associated with strong pervasive silica-sericite-ankerite ± tourmaline alteration and contains disseminated pyrite from trace to 80% with local visible gold. Pyrite stockworks can form envelopes that reach several tens of metres thick. Fuchsite alteration is common and is spatially constrained to near the gabbros. Mineralization occurs at or near geological contacts between felsic porphyritic or fragmental intrusions and the host rhyolites or gabbros and locally can be hosted along the gabbro-rhyolite contact.

Underdog
Mineralization most commonly occurs in gold-bearing quartz-pyrite (± tourmaline) veins and as disseminated, stringer, semi-massive to massive pyrite with minor sphalerite, chalcopyrite and molybdenite associated with strong sericite and silica alteration. Mineralization is hosted along the intrusive contacts of a three-phase composite felsic porphyritic unit which cross-cuts felsic and mafic volcanic sequences.

Zone 27
Mineralization most commonly occurs as replacement-type characterized by 5% to 50% disseminated, stringer, semi-massive or stockwork pyrite, ptygmatic tourmaline veins, quartz-tourmaline crustiform veins, local quartz-carbonate veins, and local visible gold. Mineralization is associated with moderate to strong sericite, weak to strong silica, weak chlorite and carbonate and locally weak fuchsite and is hosted in strongly altered andesites, in or at the contact of the rhyolite, or along the contacts with felsic porphyritic intrusions.

Windfall North
Mineralization is hosted in sheared andesites and most commonly occurs in gold-bearing quartz veins with trace to 10% pyrite, traces of sphalerite and chalcopyrite, and local visible gold. Mineralization is hosted in a silica-carbonate-sericite alteration envelope and is constrained within shear zones with pervasive sericite-carbonate ± fuchsite ± silica alteration.

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), Director of Exploration for Osisko's Windfall 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 3.5 g/t Au diluted over core lengths of at least 2.0 metres. NQ core assays 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, Vancouver, British Colombia, Lima, Peru or Vientiane, Laos (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 a Four Acid Digestion-ICP-MS method at ALS Laboratories. Drill program design, Quality Assurance/Quality Control ("QA/QC") and interpretation of results is performed by qualified persons employing a QA/QC program consistent with NI 43-101 and industry best practices. Standards and blanks are included with every 20 samples for QA/QC purposes by the Corporation as well as the lab. Approximately 5% of sample pulps are sent to secondary laboratories for check assay.

About the Windfall Gold Deposit
The Windfall gold deposit is located between Val-d'Or and Chibougamau in the Abitibi region of Québec, Canada. The Mineral Resource Estimate (MRE) defined by Osisko, as disclosed in the news release dated February 17, 2021 is supported by the technical report entitled “Preliminary Economic Assessment Update for the Windfall Project” dated April 26, 2021 (that includes Windfall Mineral Resource Estimate with an effective date  of November 30, 2020), and assuming a cut-off grade of 3.50 g/t Au, comprises 521,000 tonnes at 11.3 g/t Au (189,000 ounces) in the measured mineral resource category, 5,502,000 tonnes at 9.4 g/t Au (1,668,000 ounces) in the indicated mineral resource category and 16,401,000 tonnes at 8.0 g/t Au (4,244,000 ounces) in the inferred mineral resource category. The key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in the February 17, 2021 news release are further described in the full technical report prepared by BBA Inc. in accordance with NI 43-101 and is available on SEDAR (www.sedar.com) under the Corporation's issuer profile. The Windfall gold deposit is currently one of the highest-grade resource-stage gold projects in Canada and has world-class scale. Mineralization occurs in three principal zones: Lynx, Main Zone, and Underdog. Mineralization is generally comprised of sub-vertical zones following intrusive porphyry contacts plunging to the northeast. The resources are defined from surface to a depth of 1,600 metres as it now includes the Triple 8 (T8) zone. The resources excluding T8 are defined from surface to a depth of 1,200 metres. The deposit remains open along strike and at depth. Mineralization has been identified at surface in some areas and as deep as 2,625 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 gold resource properties in Canada. Osisko holds a 100% interest in the high-grade Windfall gold deposit located between Val-d'Or and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quévillon area (over 2,700 square kilometres).

Cautionary Note Regarding Forward-Looking Information
This news release contains "forward-looking information" within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections and interpretations as at the date of this news release. Any statement that involves predictions, expectations, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often, but not always, using phrases such as "expects", or "does not expect", "is expected", "interpreted", "management's view", "anticipates" or "does not anticipate", "plans", "budget", "scheduled", "forecasts", "estimates", "potential", "feasibility", "believes" or "intends" or variations of such words and phrases or stating that certain actions, events or results "may" or "could", "would", "might" or "will" be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to identify forward-looking information. This news release contains the forward-looking information pertaining to, among other things: the Windfall gold deposit being one of the highest-grade resource-stage gold projects in Canada and having world-class scale; the key assumptions, parameters and methods used to estimate the mineral resource estimate disclosed in this news release; the prospects, if any, of the Windfall gold deposit; timing and ability of Osisko to file a technical report for the mineral resource estimate disclosed in this news release; the timing and ability of Osisko, if at all, to publish a feasibility study for the Windfall gold deposit; the amount and type of drilling to be completed and the timing to complete such drilling; the focus of the remaining infill drilling; the trend of grade increase; the Lynx zone remaining open to expansion down plunge; upgrading a inferred mineral resource to a measured mineral resource or indicated mineral resource category; future drilling at the Windfall gold deposit; the significance of historic exploration activities and results. Such factors include, among others, risks relating to the ability of exploration activities (including drill results) to accurately predict mineralization; errors in management's geological modelling; the ability of Osisko to complete further exploration activities, including (infill) drilling; property and royalty interests in the Windfall gold deposit; the ability of the Corporation to obtain required approvals; the results of exploration activities; risks relating to mining activities; the global economic climate; metal prices; dilution; environmental risks; and community and non-governmental actions. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions, Osisko cannot assure shareholders and prospective purchasers of securities of the Corporation that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither Osisko nor any other person assumes responsibility for the accuracy and completeness of any such forward-looking information. Osisko does not undertake, and assumes no obligation, to update or revise any such forward-looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required by law.

CONTACT INFORMATION:
John Burzynski
Chief Executive Officer
Telephone (416) 363-8653




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Nachrichtenquelle: globenewswire
02.12.2021, 22:15  |  96   |   |   

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Osisko Windfall Drilling Continues to Intercept High-Grade Across the Windfall Deposit 576 g/t Au over 2.7 metres in Triple Lynx 93.1 g/t Au over 3.0 metres in Caribou 22.3 g/t Au over 4.4 metres in Underdog TORONTO, Dec. 02, 2021 (GLOBE NEWSWIRE) - Osisko Mining Inc. (OSK:TSX. "Osisko" or the "Corporation") is pleased to provide …

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