163 g/t Au over 8.8 metres in Lynx 4

32.4 g/t Au over 5.7 metres in Triple Lynx

(Toronto, December 8, 2021) 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 97 intercepts in 31 drill holes (12 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: “Today’s results underscore once again how much room there is to grow at Windfall with the headline holes located outside the resource released in February earlier this year. Targeted infill drilling also returned high-grade intercepts highlighting the robust grade of the deposit.”

Selected high-grade intercepts include: 163 g/t Au over 8.8 metres in OSK-W-21-1462-W11; 178 g/t Au over 2.9 metres in OSK-W-21-2551-W5; 135 g/t Au over 2.0 metres in OSK-W-21-1871-W1; 104 g/t Au over 2.4 metres in OSK-W-21-1949-W6; 95.2 g/t Au over 2.1 metres in OSK-W-21-2287-W7; 32.4 g/t Au over 5.7 metres in OSK-W-21-2540-W5, 49.4 g/t Au over 2.0 metres in WST-21-0903, 35.7 g/t Au over 2.4 metres in WST-21-0901, 21.5 g/t Au over 4.0 metres in OSK-W-21-2544-W2 and 42.7 g/t Au over 2.0 metres in WST-21-0879. Maps showing hole locations and full analytical results are available at www.osiskomining.com. Maps: Long Section In EN 20211208, Long Section Ex EN 20211208, PR_EN_20211208_Surface, PR_EN_20211208_UG.

Infill

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 888.6 891.0 2.4 12.5 UDD_4106 UNDERDOG
1008.0 1010.0 2.0 135 50.1 UDD_4501 Underdog
including 1008.0 1009.0 1.0 270 100
OSK-W-21-1871-W3 491.0 493.1 2.1 7.90 CA2_2211 Caribou
including 491.5 491.9 0.4 18.8
549.0 551.0 2.0 5.32 CA2_2233 Caribou
OSK-W-21-1949-W6 747.2 749.6 2.4 104 27.6 LXM_3345 Lynx
including 748.1 748.6 0.5 466 100
OSK-W-21-2287-W7 1213.9 1216.0 2.1 95.2 LX4_3449 Lynx 4
OSK-W-21-2407-W2 802.0 805.0 3.0 8.55 UDD_4106 Underdog
including 802.8 803.5 0.7 21.1
OSK-W-21-2416-W7 1018.0 1020.0 2.0 41.3 15.8 TLX_3162 Triple Lynx
including 1019.3 1019.6 0.3 270 100
1032.0 1034.0 2.0 36.8 23.9 TLX_3162 Triple Lynx
including 1032.9 1033.2 0.3 186 100
OSK-W-21-2512-W2 433.0 435.0 2.0 7.24 CA2_2211 Caribou
687.6 690.0 2.4 28.2 UDD_4100 Underdog
including 688.3 689.3 1.0 65.8
694.0 696.0 2.0 6.01 UDD_4100 Underdog
715.0 720.0 5.0 5.04 UDD_4102 Underdog
724.0 726.0 2.0 4.28 UDD_4102 Underdog
OSK-W-21-2531-W3 810.0 813.0 3.0 11.4 UDD_4110 Underdog
873.0 877.0 4.0 10.3 UDD_4101 Underdog
913.0 916.4 3.4 10.2 UDD_4100 Underdog
OSK-W-21-2531-W4 845.3 847.3 2.0 6.79 UDD_4101 Underdog
including 845.3 845.6 0.3 35.3
OSK-W-21-2532-W3 828.0 833.0 5.0 8.29 UDD_4100 Underdog
including 832.0 833.0 1.0 24.0
837.8 842.0 4.2 19.0 16.1 UDD_4100 Underdog
including 840.0 840.4 0.4 131 100
OSK-W-21-2537-W3 938.0 940.0 2.0 12.6 TLX_3183 Triple Lynx
OSK-W-21-2544-W2 774.9 777.0 2.1 4.22 TLX_3171 Triple Lynx
783.0 787.0 4.0 21.5 TLX_3171 Triple Lynx
including 784.5 785.2 0.7 62.8
793.0 795.0 2.0 19.0 TLX_3184 Triple Lynx
including 794.0 794.4 0.4 93.3
989.0 991.0 2.0 17.5 TLX_3195 Triple Lynx
including 989.4 990.0 0.6 58.1
OSK-W-21-2551-W5 941.3 943.5 2.2 17.3 LX4_3430 Lynx 4
including 942.0 942.4 0.4 78.6
958.4 961.3 2.9 178 36.3 LX4_3430 Lynx 4
including 958.8 959.7 0.9 556 100
OSK-W-21-2578-W3 604.7 606.9 2.2 7.71 UDD_4100 Underdog
including 606.1 606.9 0.8 20.9
OSK-W-21-2587-W1 1030.0 1032.0 2.0 20.5 TLX_3163 Triple Lynx
1038.0 1040.0 2.0 5.36 TLX_3164 Triple Lynx
including 1038.7 1039.0 0.3 27.1
1046.0 1049.0 3.0 3.99 TLX_3164 Triple Lynx
1089.0 1091.0 2.0 5.66 TLX_3162 Triple Lynx
including 1089.0 1089.4 0.4 16.6
1105.6 1109.0 3.4 8.17 TLX_3170 Triple Lynx
OSK-W-21-2600 475.8 478.0 2.2 5.70 Z27_1115 Zone 27
OSK-W-21-2605 1312.0 1314.0 2.0 5.62 LX4_3445 Lynx 4
OSK-W-21-2612-W1 382.6 384.9 2.3 4.02 Z27_1115 Zone 27
including 382.6 383.0 0.4 14.4
OSK-W-21-2613 916.2 922.0 5.8 14.6 TLX_3161 Triple Lynx
including 916.2 916.6 0.4 38.1
and 918.7 919.3 0.6 41.0
967.9 970.0 2.1 19.8 TLX_3163 Triple Lynx
including 967.9 968.3 0.4 60.9
and 968.9 969.3 0.4 42.5
994.0 996.0 2.0 3.77 TLX_3164 Triple Lynx
including 994.4 995.0 0.6 8.21
OSK-W-21-2621 628.0 630.0 2.0 18.6 UDD_4101 Underdog
OSK-W-21-2625 814.9 817.3 2.4 10.9 LX4_3437 Lynx 4
including 814.9 815.2 0.3 55.1
OSK-W-21-2631 133.0 135.0 2.0 26.5 F11_6001 F-11
OSK-W-21-2632 103.0 105.0 2.0 3.66 F11_6000 F-11
139.0 141.5 2.5 19.6 F11_6009 F-11
including 139.6 140.5 0.9 47.7
OSK-W-21-2635 568.0 570.4 2.4 4.21 CA2_2211 Caribou
including 570.1 570.4 0.3 24.2
see & read more on
https://www.osiskomining.com/osisko-windfall-drilling-intercepts-wide-high-grade-in-expansion-holes/