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Expansion Drilling Adds New High-Grade for Osisko

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Osisko Mining Inc.
·29 min read
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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 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 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