Expansion Drilling Adds New High-Grade for Osisko



141 g/t Au Over 3.5 Metres in Lynx




29.2 g/t Au over 2.1 Metres in Caribou



31.4 g/t Au Over 2.4 Metres in F51

TORONTO, Feb. 23, 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.

Approximately 200,000 metres remain in the drill program, focused on the Lynx portion of the deposit. Osisko expects to complete resource drilling by the fall of 2021.

Osisko Chief Executive Officer John Burzynski commented: “Today’s expansion drill results are a strong confirmation that many of the zones across the deposit remain open to growth. The results presented below fall outside the wireframes in the recently published mineral resource estimate (“MRE”), and OSK-W-20-2391 in particular extends Triple Lynx 150 metres from the closest MRE block.”

Significant new analytical results presented below include 145 intercepts in 56 drill holes (31 from surface, 25 from underground) and 33 wedges.

Selected intercepts include:

141 g/t Au over 3.5 metres

in WST-20-0524;

74.9 g/t Au over 2.3 metres

in WST-20-0547;

57.8 g/t Au over 2.3 metres

in OSK-W-20-2275-W4;

13.3 g/t Au over 6.4 metres

in WST-20-0478;

26.0 g/t Au over 3.2 metres

in OSK-W-20-2354-W1;

31.4 g/t Au over 2.4 metres

in OSK-W-20-2391;

25.9 g/t Au over 2.9 metres

in WST-20-0570;

15.9 g/t Au over 4.7 metres

in WST-20-0346;

16.9 g/t Au over 4.2 metres

in OSK-W-20-2354; and

24.4 g/t Au 2.9 metres

in OSK-W-20-2369. Maps showing hole locations and full analytical results are available at

www.osiskomining.com

.



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-20-852-W2

792.2

794.5

2.3

4.68


Caribou_2219


Caribou


including
793.2 793.5 0.3 32.7

OSK-W-20-852-W3

640.4

646.8

6.4

10.6


Caribou


Caribou


including
640.4 640.7 0.3 43.4

681.0

683.0

2.0

4.20


Caribou_2255

Caribou

OSK-W-20-852-W4

814.0

816.0

2.0

13.9


Caribou


Caribou


including
814.0 815.0 1.0 21.8

OSK-W-20-913-W2

622.0

624.0

2.0

4.60


Caribou


Caribou


including
622.5 622.8 0.3 28.8

672.0

674.5

2.5

4.00


Caribou


Caribou


including
673.0 673.5 0.5 16.8

755.0

757.0

2.0

16.7


Caribou


Caribou


including
755.4 756.0 0.6 53.9

858.0

860.0

2.0

3.48


Caribou

Caribou

OSK-W-20-2170-W7

1102.0

1104.0

2.0

5.61


TLX_3170


Triple Lynx


including
1102.5 1102.9 0.4 23.5

OSK-W-20-2252-W8

1190.0

1192.0

2.0

7.24


Triple Lynx


Triple Lynx


including
1190.0 1190.3 0.3 24.7

OSK-W-20-2252-W10

989.0

991.0

2.0

12.2


TLX_3163

Triple Lynx

993.0

999.6

6.6

9.83


TLX_3163


Triple Lynx


including
998.9 999.3 0.4 71.3

OSK-W-20-2256-W8

987.0

989.0

2.0

4.19


TLX_3164

Triple Lynx

OSK-W-20-2271-W4

792.0

794.0

2.0

29.4


Lynx


Lynx


including
792.0 793.0 1.0 55.0

804.0

807.0

3.0

8.32


Lynx


Lynx


including
804.0 804.6 0.6 21.9

OSK-W-20-2275-W4

920.7

923.0

2.3

57.8

17.6

Triple Lynx


Triple Lynx


including
921.2 921.5 0.3 408 100

OSK-W-20-2280-W6

937.5

939.5

2.0

4.75


Triple Lynx


Triple Lynx


including
937.5 937.8 0.3 16.1

1078.9

1081.0

2.1

11.3


TLX_3170

Triple Lynx

OSK-W-20-2280-W8

960.9

964.0

3.1

5.07


TLX_3163

Triple Lynx

OSK-W-20-2280-W9

1071.0

1075.0

4.0

4.82


TLX_3162


Triple Lynx


including
1074.0 1075.0 1.0 12.7

OSK-W-20-2283-W3

939.0

941.3

2.3

4.50


TLX_3194


Triple Lynx


including
940.2 940.6 0.4 25.0

OSK-W-20-2283-W4

983.0

985.0

2.0

4.46


TLX_3195

Triple Lynx

OSK-W-20-2287

1284.0

1286.0

2.0

8.11


LX4_3445


Lynx


including
1284.3 1284.8 0.5 32.0

OSK-W-20-2295-W2

919.6

921.6

2.0

3.76


Triple Lynx


Triple Lynx


including
919.6 920.0 0.4 18.4

OSK-W-20-2300

9.2

13.0

3.8

7.10


F17

F17

24.0

26.0

2.0

9.95


F17

F17

39.0

44.3

5.3

9.59


F17

F17

OSK-W-20-2313-W4

1119.3

1121.9

2.6

4.08


Triple Lynx


Triple Lynx


including
1120.2 1121.0 0.8 12.5

OSK-W-20-2313-W5

911.9

914.0

2.1

21.2

17.5

Triple Lynx


Triple Lynx


including
911.9 912.2 0.3 126 100

OSK-W-20-2313-W6

929.0

931.0

2.0

5.42


Triple Lynx


Triple Lynx


including
929.8 930.2 0.4 12.5

1003.2

1005.3

2.1

5.89


TLX_3195


Triple Lynx


including
1003.2 1003.7 0.5 18.5

OSK-W-20-2313-W7

868.7

872.6

3.9

6.43


TLX_3161

Triple Lynx

OSK-W-20-2319

290.0

292.5

2.5

5.93


Bobcat

Bobcat

672.0

674.0

2.0

5.13


Lynx SW


Lynx


including
672.0 672.9 0.9 11.4

OSK-W-20-2322-W3

812.0

814.4

2.4

24.4


Lynx


Lynx


including
812.5 813.0 0.5 59.6

857.0

859.0

2.0

6.67


Lynx


Lynx


including
857.7 858.5 0.8 14.5

OSK-W-20-2328

287.0

289.5

2.5

4.92


Caribou


Caribou


including
289.1 289.5 0.4 24.4

351.6

353.6

2.0

3.95


Caribou

Caribou

OSK-W-20-2331

51.0

53.0

2.0

4.86


Mallard_5216

Mallard

OSK-W-20-2338

37.0

39.0

2.0

5.12


F17

F17

OSK-W-20-2340

75.0

77.0

2.0

6.51


F17


F17


including
76.1 76.7 0.6 21.4

OSK-W-20-2346

590.0

592.0

2.0

6.20


LXM_3323

Lynx

809.0

811.0

2.0

3.79


Triple Lynx

Triple Lynx

OSK-W-20-2354

501.0

503.3

2.3

5.33


Caribou_2116


Caribou


including
501.0 502.0 1.0 12.0

620.0

622.0

2.0

24.7


Caribou


Caribou


including
620.0 620.4 0.4 76.5

695.5

697.5

2.0

7.53


Caribou_2217


Caribou


including
696.7 697.1 0.4 29.2

728.7

730.7

2.0

19.5


Caribou_2218


Caribou


including
729.4 729.8 0.4 77.0

735.3

739.5

4.2

16.9

15.1

Caribou_2218


Caribou


including
739.2 739.5 0.3 125 100

OSK-W-20-2354-W1

702.0

704.0

2.0

4.80


Caribou


Caribou


including
703.0 704.0 1.0 9.26

722.2

725.4

3.2

26.0


Caribou


Caribou


including
723.4 724.0 0.6 55.3

757.2

759.9

2.7

13.5


Caribou


Caribou


including
757.2 757.5 0.3 74.8

OSK-W-20-2354-W2

545.0

547.5

2.5

7.42


Caribou


Caribou


including
546.2 546.5 0.3 47.3

OSK-W-20-2354-W3

541.3

544.0

2.7

3.99


Caribou

Caribou

OSK-W-20-2354-W4

730.4

733.0

2.6

4.65


Caribou

Caribou

OSK-W-20-2362

58.0

60.0

2.0

31.7

25.6

Bobcat_2355


Bobcat


including
58.5 59.0 0.5 125 100

OSK-W-20-2363

970.6

972.6

2.0

3.88


Triple Lynx

Triple Lynx

OSK-W-20-2363-W2

666.4

669.7

3.3

6.59


TLX_3196


Triple Lynx


including
669.4 669.7 0.3 31.8

OSK-W-20-2365

44.0

46.5

2.5

8.36


Bobcat

Bobcat

OSK-W-20-2369

584.9

587.8

2.9

24.4


Lynx


Lynx


including
586.7 587.8 1.1 35.6

640.0

642.0

2.0

29.2

26.4

LXM_3304


Lynx


including
640.4 640.9 0.5 111 100

654.1

656.3

2.2

7.16


LXM_3341


Lynx


including
654.1 654.4 0.3 36.2

660.0

662.0

2.0

6.06


LXM_3341

Lynx

OSK-W-20-2371

796.5

798.8

2.3

17.2

13.2

Triple Lynx


Triple Lynx


including
796.5 796.8 0.3 131 100

1049.0

1051.0

2.0

7.30


Lynx

Lynx

OSK-W-20-2371-W1

847.0

849.0

2.0

7.72


Triple Lynx

Triple Lynx

OSK-W-20-2371-W2

1023.0

1025.2

2.2

4.93


Triple Lynx

Triple Lynx

OSK-W-20-2375-W1

907.3

909.7

2.4

18.5


LX4_3437


Lynx


including
908.4 909.3 0.9 36.8

OSK-W-20-2376

131.6

133.8

2.2

4.01


Caribou

Caribou

233.0

235.0

2.0

4.27


Caribou


Caribou


including
233.0 233.3 0.3 27.6

OSK-W-20-2377-W1

876.5

878.6

2.1

28.9

24.0

Caribou extension


Caribou


including
876.5 877.0 0.5 121 100

882.8

884.8

2.0

16.4


Caribou extension


Caribou


including
882.8 883.8 1.0 32.7

OSK-W-20-2381

1116.4

1118.7

2.3

4.02


Lynx 4

Lynx

OSK-W-20-2384

547.0

549.0

2.0

9.31


Lynx


Lynx


including
548.0 549.0 1.0 18.2

OSK-W-20-2387-W1

496.0

498.1

2.1

4.17


Caribou


Caribou


including
496.0 496.4 0.4 12.2

OSK-W-20-2388

317.6

319.7

2.1

10.7


Caribou


Caribou


including
317.6 318.6 1.0 22.4

568.7

571.1

2.4

4.85


Caribou_2250


Caribou


including
570.0 570.5 0.5 18.4

663.0

665.0

2.0

11.6


Caribou_2219


Caribou


including
663.0 664.0 1.0 23.0

666.0

668.1

2.1

4.12


Caribou_2219


Caribou


including
667.5 668.1 0.6 13.7

OSK-W-20-2390

579.0

581.2

2.2

27.9


Caribou_2247


Caribou


including
580.2 580.7 0.5 93.3

OSK-W-20-2391

234.6

237.0

2.4

31.4

21.3

F51


F51


including
235.4 235.9 0.5 149 100

1372.5

1376.0

3.5

8.73


Triple Lynx


Triple Lynx


including
1373.3 1373.7 0.4 36.0

1497.0

1503.0

6.0

8.84


Triple Lynx

Triple Lynx

1526.0

1528.0

2.0

15.7


Triple Lynx

Triple Lynx

OSK-W-20-2397

603.0

605.1

2.1

9.70


Lynx


Lynx


including
603.3 604.0 0.7 27.3

612.0

614.0

2.0

7.36


Lynx

Lynx

654.0

656.5

2.5

4.16


LXM_3304


Lynx


including
655.0 655.4 0.4 12.5

698.5

700.5

2.0

4.07


LXM_3304


Lynx


including
700.0 700.5 0.5 11.9

975.0

977.1

2.1

7.12


Lynx 4

Lynx

1031.0

1033.0

2.0

11.0


Lynx 4


Lynx


including
1032.7 1033.0 0.3 69.9

1039.0

1041.0

2.0

4.76


Lynx 4


Lynx


including
1039.6 1040.3 0.7 12.9

1058.0

1060.2

2.2

26.1

19.6

LX4_3430


Lynx


including
1058.8 1059.2 0.4 136 100

OSK-W-20-2399-W1

551.0

554.3

3.3

19.2


Caribou_2523


Caribou


including
553.5 554.3 0.8 69.0

OSK-W-20-2400

815.0

817.0

2.0

9.57


Caribou


Caribou


including
815.4 816.0 0.6 31.5

OSK-W-20-2405

519.6

521.8

2.2

4.59


Caribou

Caribou

OSK-W-20-2405-W1

518.0

520.0

2.0

8.09


Caribou

Caribou

620.0

622.0

2.0

6.44


Caribou


Caribou


including
620.5 621.0 0.5 22.8

669.0

672.0

3.0

8.57


Caribou

Caribou

OSK-W-20-2406

635.0

638.7

3.7

10.1


Caribou_2241


Caribou


including
636.0 637.0 1.0 21.8

642.0

649.3

7.3

6.34


Caribou_2241


Caribou


including
647.7 648.3 0.6 17.9

and
648.7 649.3 0.6 21.0

OSK-W-20-2415

639.8

643.5

3.7

7.66


Caribou_2233


Caribou


including
639.8 640.1 0.3 27.9

and
640.4 640.7 0.3 33.2

680.0

682.3

2.3

8.40


Caribou_2217


Caribou


including
681.4 682.3 0.9 19.4

OSK-W-20-2421

685.0

687.2

2.2

6.02


Caribou

Caribou

OSK-W-20-2425

298.0

301.0

3.0

18.9


Caribou


Caribou


including
299.0 300.0 1.0 40.4

OSK-W-20-2432

725.0

727.4

2.4

9.40


Caribou


Caribou


including
726.1 726.4 0.3 32.4

794.6

799.6

5.0

6.98


Caribou


Caribou


including
794.6 795.5 0.9 20.4

804.3

806.6

2.3

7.92


Caribou


Caribou


including
804.3 805.1 0.8 20.0

OSK-W-20-2440

719.0

721.0

2.0

6.26


Caribou


Caribou


including
719.0 719.8 0.8 15.6

OSK-W-21-2451

430.8

434.0

3.2

20.4


Caribou


Caribou


including
431.2 431.6 0.4 94.7

516.8

519.0

2.2

8.78


Caribou


Caribou


including
517.1 517.7 0.6 30.1

OSK-W-21-2455

479.9

482.2

2.3

21.0

15.0

Caribou_2116


Caribou


including
479.9 480.2 0.3 146 100

WST-20-0346

118.2

120.4

2.2

16.1


Caribou_2151


Caribou


including
118.2 118.7 0.5 69.8

348.0

352.7

4.7

15.9


Caribou corridor

Caribou

WST-20-0476

260.9

263.1

2.2

5.92


Caribou corridor

Caribou

374.8

376.8

2.0

12.7


Caribou corridor


Caribou


including
376.3 376.8 0.5 45.8

WST-20-0477

52.4

55.0

2.6

9.78


Mallard

Mallard

228.0

230.4

2.4

4.55


Caribou_2100

Caribou

WST-20-0478

167.6

174.0

6.4

13.3

12.8

Caribou_2151


Caribou


including
172.4 173.0 0.6 106 100

354.0

356.0

2.0

4.72


Caribou


Caribou


including
354.0 354.5 0.5 18.4

WST-20-0479B

147.1

149.1

2.0

7.97


Z27_1115

Zone 27

157.5

159.8

2.3

5.66


Z27

Zone 27

WST-20-0480B

376.0

378.0

2.0

9.80


Caribou

Caribou

WST-20-0496

302.0

304.2

2.2

4.24


Lynx SW


Lynx SW


including
303.4 303.7 0.3 30.7

513.6

516.2

2.6

10.9


Lynx SW


Lynx SW


including
513.6 513.9 0.3 81.3

WST-20-0521

367.0

369.1

2.1

12.1


Caribou


Caribou


including
367.6 368.6 1.0 24.4

WST-20-0522

374.0

376.0

2.0

6.98


Lynx SW


Lynx SW


including
374.8 375.5 0.7 19.7

WST-20-0524

225.8

229.3

3.5

141

28.6

Lynx SW


Lynx SW


including
228.4 229.3 0.9 536 100

WST-20-0534

122.0

124.2

2.2

10.4


LXM_3359


Lynx


including
123.2 124.2 1.0 22.9

WST-20-0547

421.6

423.9

2.3

74.9

43.4

LXSW_3502


Lynx


including
423.0 423.9 0.9 181 100

WST-20-0552

127.0

129.0

2.0

11.1


LXM_3339


Lynx


including
127.6 128.3 0.7 29.9

235.7

238.0

2.3

22.7


LXSW_3506


Lynx


including
236.4 237.4 1.0 51.8

WST-20-0556

96.3

98.4

2.1

4.66


Bobcat


Bobcat


including
97.8 98.4 0.6 13.5

WST-20-0566A

13.7

17.2

3.5

17.7


Mallard_5211


Mallard


including
14.6 15.3 0.7 38.3

WST-20-0567

58.0

60.0

2.0

4.55


Z27


Zone 27


including
58.0 59.0 1.0 9.01

296.0

298.0

2.0

5.01


Caribou corridor

Caribou

WST-20-0569

259.9

262.0

2.1

14.6


LXSW_3507


Lynx SW


including
261.5 262.0 0.5 26.7

WST-20-0570

206.2

209.1

2.9

25.9


Lynx SW


Lynx SW


including
207.8 208.4 0.6 55.0

WST-20-0572A

272.0

274.0

2.0

11.0


LXSW_3556

Lynx SW

WST-20-0574

283.6

285.9

2.3

13.7


Lynx SW

Lynx SW

WST-20-0578

170.0

172.0

2.0

24.3


LXM_3304


Lynx


including
170.8 171.2 0.4 76.8

785.0

792.0

7.0

9.09


LX4_3412


Lynx


including
789.5 790.4 0.9 24.2

WST-20-0581

408.9

411.0

2.1

14.8


LXSW_3556


Lynx


including
408.9 409.8 0.9 34.4

WST-20-0589

351.0

353.1

2.1

29.2


Caribou


Caribou


including
351.7 352.6 0.9 67.7

WST-20-0584

122.0

124.0

2.0

11.4


LXM_3301

Lynx

WST-20-0626

134.4

136.8

2.4

4.19


LXM_3307


Lynx


including
134.4 135.0 0.6 9.74

138.3

140.5

2.2

19.4


LXM_3307


Lynx


including
138.8 139.8 1.0 41.4

Notes: True widths are estimated at 55 – 80% of the reported core length interval. See

“Quality Control and Reporting Protocols”

below. SW = Southwest.



Drill hole location


Hole Number

Azimuth (°)

Dip (°)

Length (m)

UTM E

UTM N

Elevation

Section

OSK-W-20-852-W2
330 -55 873 452874 5434552 398 2875

OSK-W-20-852-W3
330 -55 849 452874 5434552 398 2875

OSK-W-20-852-W4
330 -55 873 452874 5434552 398 2875

OSK-W-20-913-W2
334 -52 913 452878 5434419 401 2825

OSK-W-20-2170-W7
128 -59 1205 453425 5435657 413 3900

OSK-W-20-2252-W8
129 -54 1239 453241 5435694 415 3750

OSK-W-20-2252-W10
129 -54 824 453241 5435694 415 3750

OSK-W-20-2256-W8
125 -51 1056 453160 5435686 411 3675

OSK-W-20-2271-W4
120 -53 1134 453462 5435683 410 3950

OSK-W-20-2275-W4
127 -49 1052 452888 5435583 409 3400

OSK-W-20-2280-W6
127 -58 1152 453304 5435639 415 3775

OSK-W-20-2280-W8
127 -58 1134 453304 5435639 415 3775

OSK-W-20-2280-W9
127 -58 1037 453304 5435639 415 3775

OSK-W-20-2283-W3
135 -50 1004 452997 5435607 425 3500

OSK-W-20-2283-W4
135 -50 1012 452997 5435607 425 3500

OSK-W-20-2287
116 -53 1406 453607 5435714 404 4075

OSK-W-20-2295-W2
132 -51 963 452933 5435473 415 3375

OSK-W-20-2300
152 -45 192 452699 5435578 406 3225

OSK-W-20-2313-W4
134 -52 1134 452965 5435583 420 3450

OSK-W-20-2313-W5
134 -52 1086 452965 5435583 420 3450

OSK-W-20-2313-W6
134 -52 1029 452965 5435583 420 3450

OSK-W-20-2313-W7
134 -52 1086 452965 5435583 420 3450

OSK-W-20-2319
141 -50 768 452872 5435153 409 3175

OSK-W-20-2322-W3
130 -54 1274 453608 5435715 403 4075

OSK-W-20-2328
136 -56 942 452872 5435153 409 3175

OSK-W-20-2331
335 -50 239 451987 5434764 406 2200

OSK-W-20-2338
155 -57 213 452679 5435584 405 3200

OSK-W-20-2340
146 -55 201 452650 5435568 405 3175

OSK-W-20-2346
130 -53 1161 453397 5435557 413 3825

OSK-W-20-2354
336 -60 759 452739 5434474 401 2725

OSK-W-20-2354-W1
336 -60 792 452739 5434474 401 2725

OSK-W-20-2354-W2
336 -60 750 452739 5434474 401 2725

OSK-W-20-2354-W3
336 -60 750 452739 5434474 401 2725

OSK-W-20-2354-W4
336 -60 783 452739 5434474 401 2725

OSK-W-20-2362
350 -45 256 452719 5434777 398 2850

OSK-W-20-2363
139 -52 1031 452930 5435548 419 3425

OSK-W-20-2363-W2
139 -52 695 452930 5435548 419 3425

OSK-W-20-2365
354 -46 312 452673 5434766 398 2800

OSK-W-20-2369
130 -56 909 453426 5435565 410 3850

OSK-W-20-2371
123 -53 1203 452996 5435364 412 3375

OSK-W-20-2371-W1
123 -53 1032 452996 5435364 412 3375

OSK-W-20-2371-W2
123 -53 945 452996 5435364 412 3375

OSK-W-20-2375-W1
122 -56 987 453810 5435779 400 4300

OSK-W-20-2376
325 -55 510 452689 5434635 398 2750

OSK-W-20-2377-W1
132 -49 1097 452702 5435548 409 3225

OSK-W-20-2381
134 -53 1230 453620 5435791 402 4125

OSK-W-20-2384
127 -52 1164 453397 5435557 413 3825

OSK-W-20-2387-W1
336 -59 738 452694 5434440 401 2675

OSK-W-20-2388
326 -61 363 452715 5434606 397 2775

OSK-W-20-2390
330 -65 647 452597 5434393 401 2550

OSK-W-20-2391
117 -57 1230 453281 5435894 408 3900

OSK-W-20-2397
131 -58 1197 453451 5435594 412 3900

OSK-W-20-2399-W1
333 -54 425 452874 5434552 398 2875

OSK-W-20-2400
336 -53 884 452876 5434419 402 2825

OSK-W-20-2405
332 -58 723 452694 5434440 401 2675

OSK-W-20-2405-W1
332 -58 716 452694 5434440 401 2675

OSK-W-20-2406
333 -56 623 452632 5434280 400 2525

OSK-W-20-2415
328 -54 143 452738 5434474 401 2725

OSK-W-20-2421
332 -59 699 452632 5434280 400 2525

OSK-W-20-2425
336 -60 747 452715 5434606 397 2775

OSK-W-20-2432
333 -57 864 452809 5434415 404 2750

OSK-W-20-2440
330 -52 807 452739 5434474 401 2725

OSK-W-21-2451
330 -58 803 452809 5434415 404 2750

OSK-W-21-2455
328 -53 780 452738 5434474 401 2725

WST-20-0346
136 -18 391 452282 5434975 264 2575

WST-20-0476
132 -33 403 452282 5434975 263 2575

WST-20-0477
131 -30 394 452282 5434976 263 2575

WST-20-0478
123 -31 391 452282 5434976 263 2575

WST-20-0479B
138 -59 393 452281 5434975 262 2575

WST-20-0480B
142 -52 382 452281 5434975 262 2575

WST-20-0496
173 -60 537 453227 5435125 134 3475

WST-20-0521
151 -58 385 452281 5434975 262 2575

WST-20-0522
177 -52 457 453104 5435064 231 3325

WST-20-0524
182 -44 243 453104 5435064 231 3325

WST-20-0534
143 -32 135 453315 5435165 124 3575

WST-20-0547
167 -53 487 453227 5435125 134 3475

WST-20-0552
165 -39 517 453257 5435209 97 3525

WST-20-0556
155 -26 163 452955 5435003 254 3175

WST-20-0566A
133 -16 368 452208 5434898 248 2475

WST-20-0567
139 -19 379 452208 5434898 248 2475

WST-20-0569
165 -59 526 453104 5435065 231 3325

WST-20-0570
159 -50 454 453104 5435065 231 3325

WST-20-0572A
136 -51 463 452955 5435004 252 3175

WST-20-0574
139 -62 370 452955 5435004 252 3175

WST-20-0578
151 -46 802 453418 5435306 68 3725

WST-20-0581
181 -60 474 453177 5435126 173 3425

WST-20-0589
147 -55 376 452281 5434975 263 2575

WST-20-0584
174 -19 205 453417 5435304 69 3725

WST-20-0626
194 -59 471 453176 5435125 173 3425


Lynx Zone


Mineralization occurs as grey to translucent quartz-carbonate-pyrite-tourmaline veins and pyrite replacement zones and stockworks. The vein-type 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.


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.


F-Zone


Mineralization is hosted in sheared andesites with carbonate replacement or quartz veining and occurs as quartz ± ankerite veinlets or in shear zones as replacement, characterised by trace to 10% pyrite with local visible gold. Alteration is dominated by sericite-fuchsite-tourmaline-pyrite.


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.


Mallard


Mineralization is hosted in sheared mafic volcanics with felsic porphyritic intrusions and occurs as veins associated with sericite-pyrite ± silica ± chlorite alteration and contains pyrite ranging from trace to 30% and local visible gold.


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. 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 defined by Osisko, as disclosed in the news release dated February 17, 2021 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, certain of which are described in the February 17, 2021 news release, will be further described in the full technical report being prepared for this updated mineral resource estimate in accordance with NI 43-101, and will be available on SEDAR (www.sedar.com) under the Corporation’s issuer profile within 45 days from February 17, 2021. 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 r


esources 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.


T


he 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 precious metal 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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