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To: LoneClone who wrote (163932)2/25/2022 12:36:02 PM
From: LoneClone  Read Replies (1) | Respond to of 192641
 
Osisko Mining Windfall Drilling Continues to Intercept High Grade

ca.finance.yahoo.com

Osisko Mining Inc.
Thu, February 24, 2022, 6:58 a.m.·22 min read

449 g/t Au over 2.3 metres in Lynx

TORONTO, Feb. 24, 2022 (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 128 intercepts in 54 drill holes (6 from surface, 48 from underground) and 20 wedges. The infill intercepts are located inside defined January 2022 mineral resource estimate (“MRE”) blocks (see Osisko news release dated January 10, 2022). The expansion intercepts are located outside the January 2022 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 drill results reinforce Windfall’s strong upside. We continue to be successful with our expansion drilling as illustrated by four new intercepts which expand Triple Lynx wireframe 3172 100 meters to the east as well as our headline hole from the Lynx hanging wall area. Infill drilling is continuing to intercept grade and width where anticipated, with the purpose of converting inferred blocks to the measured and indicated categories in support of the feasibility study to be completed later this year.”

Selected high-grade intercepts include: 449 g/t Au over 2.3 metres in WST-21-0935; 56.5 g/t Au over 6.9 metres in OSK-W-21-1949-W13; 52.7 g/t Au over 6.5 metres in OSK-W-21-1963-W10; 124 g/t Au over 2.6 metres in OSK-W-21-2601 and 21.8 g/t Au over 8.9 metres in OSK-W-21-2540-W7. 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-21-1871-W1

498.4

500.4

2.0

13.1


CA2_2225

Caribou

including

499.0

499.4

0.4

65.3


OSK-W-21-1949-W10

1073.0

1075.6

2.6

42.0

35.2

LX4_3430

Lynx 4

including

1073.8

1074.7

0.9

120

100

OSK-W-21-1949-W13

1081.5

1088.4

6.9

56.5

37.7

LX4_3404

Lynx 4

including

1081.5

1082.2

0.7

284

100

OSK-W-21-1949-W15

1095.5

1100.6

5.1

25.3

14.0

LX4_3404

Lynx 4

including

1096.5

1097.0

0.5

216

100

OSK-W-21-1949-W16

650.0

656.0

6.0

4.20


LXM_3353

Lynx

including

653.7

654.0

0.3

16.2



737.6

742.3

4.7

24.1


LXM_3345

Lynx

including

738.1

739.0

0.9

71.3


OSK-W-21-1963-W10

1317.7

1324.2

6.5

52.7

40.1

LX4_3449

Lynx 4

including

1320.1

1321.1

1.0

182

100

OSK-W-21-2512-W3

667.4

669.4

2.0

8.09


UDD_4128

Underdog

including

668.3

668.6

0.3

17.5



748.0

750.0

2.0

4.74


UDD_4104

Underdog

including

748.0

748.4

0.4

22.0



774.0

776.1

2.1

9.36


UDD_4106

Underdog

including

775.7

776.1

0.4

47.0


OSK-W-21-2531-W3

815.0

817.0

2.0

25.4


UDD_4135

Underdog


820.3

826.0

5.7

9.27


UDD_4121

Underdog

including

820.3

820.8

0.5

51.4


OSK-W-21-2544-W1

769.6

776.3

6.7

14.7


TLX_3171

Triple Lynx

including

771.7

772.0

0.3

55.0


and

772.0

772.5

0.5

69.4


OSK-W-21-2544-W3

767.3

770.4

3.1

16.7


TLX_3171

Triple Lynx

including

768.0

768.7

0.7

52.2


OSK-W-21-2578

585.8

588.0

2.2

7.90


UDD_4128

Underdog

including

587.0

587.3

0.3

33.5


OSK-W-21-2640-W1

649.2

652.0

2.8

4.85


CA2_2262

Caribou

OSK-W-21-2646

1046.4

1054.3

7.9

5.66


TLX_3158

Triple Lynx

including

1047.1

1048.0

0.9

13.8


WST-21-0708

617.2

619.5

2.3

8.56


LX4_3448

Lynx 4

including

619.2

619.5

0.3

63.6


WST-21-0878

184.4

186.5

2.1

15.7


TLX_3161

Triple Lynx

including

186.2

186.5

0.3

62.6



190.0

192.1

2.1

20.8


TLX_3161

Triple Lynx

including

191.6

192.1

0.5

87.3


WST-21-0879

367.0

369.1

2.1

7.16


TLX_3167

Triple Lynx

WST-21-0881A

297.6

301.7

4.1

12.3

11.5

LSW_3556

Lynx SW

including

299.0

299.3

0.3

111

100

WST-21-0883

283.7

286.0

2.3

6.96


LSW_3500

Lynx SW

including

284.8

285.2

0.4

37.8


WST-21-0894B

305.2

307.4

2.2

42.0

24.7

LSW_3501

Lynx SW

including

306.1

306.5

0.4

195

100

WST-21-0896

521.7

523.9

2.2

6.87


LX4_3450

Lynx 4

including

522.7

523.0

0.3

49.2


WST-21-0897A

345.6

351.1

5.5

6.72


TLX_3131

Triple Lynx

including

350.3

351.1

0.8

22.5



522.0

524.4

2.4

4.06


LX4_3403

Lynx 4

including

522.0

522.4

0.4

20.7



545.0

547.0

2.0

16.9


LX4_3104

Lynx 4


660.0

662.0

2.0

49.1

26.6

LX4_3448

Lynx 4

including

660.8

661.1

0.3

250

100

WST-21-0905C

323.0

325.0

2.0

27.9


TLX_3166

Triple Lynx


464.7

466.8

2.1

7.18


LX4_3450

Lynx 4

including

464.7

465.1

0.4

21.9


WST-21-0908C

529.5

531.7

2.2

30.3

19.0

LX4_3404

Lynx 4

including

530.0

530.4

0.4

163

100


554.3

557.6

3.3

21.5

18.5

LX4_3430

Lynx 4

including

554.3

554.8

0.5

120

100

WST-21-0911

546.7

549.0

2.3

10.3


LX4_3430

Lynx 4

including

547.6

547.9

0.3

71.1


WST-21-0912

497.0

499.0

2.0

6.09


LX4_3450

Lynx 4

including

497.4

498.0

0.6

19.8


WST-21-0914

313.9

315.9

2.0

4.68


LSW_3556

Lynx SW

WST-21-0919

366.3

368.6

2.3

8.97


TLX_3167

Triple Lynx

including

368.0

368.6

0.6

33.6



425.6

427.8

2.2

8.84


TLX_3165

Triple Lynx

including

426.0

426.8

0.8

23.7


WST-21-0924A

44.9

47.0

2.1

16.7


LXM_3303

Lynx

including

45.4

45.9

0.5

67.1



64.0

66.1

2.1

42.8

24.6

LXM_3336

Lynx

including

64.0

64.5

0.5

177

100

WST-21-0927

512.0

514.0

2.0

10.6


LX4_3450

Lynx 4

including

512.6

513.1

0.5

35.0



720.7

725.0

4.3

20.7


LX4_3412

Lynx 4

including

723.0

724.0

1.0

50.9


WST-21-0928

264.4

266.8

2.4

9.03


TLX_3161

Triple Lynx

WST-21-0931

313.3

315.3

2.0

27.4


TLX_3131

Triple Lynx


527.0

529.0

2.0

13.3


LX4_3450

Lynx 4

including

527.7

528.0

0.3

67.6


WST-21-0932

204.8

207.8

3.0

49.9

36.8

LHW_3207

Lynx HW

including

207.1

207.8

0.7

156

100

WST-21-0933A

712.4

716.4

4.0

10.0


LX4_3412

Lynx 4

WST-21-0935

160.7

164.6

3.9

11.4


LXM_3388

Lynx

including

160.7

161.5

0.8

47.6


WST-21-0936A

338.3

340.5

2.2

4.80


TLX_3133

Triple Lynx

including

339.6

340.5

0.9

11.3



436.5

439.5

3.0

3.96


TLX_3165

Triple Lynx

WST-21-0937

96.0

98.2

2.2

5.40


LXM_3371

Lynx

including

97.1

97.5

0.4

29.0


WST-21-0943

302.8

305.0

2.2

7.80


TLX_3153

Triple Lynx

including

303.7

304.2

0.5

18.2


WST-21-0946

326.0

330.1

4.1

20.4


TLX_3131

Triple Lynx

including

329.6

330.1

0.5

75.2


WST-21-0948

454.9

457.0

2.1

5.64


LX4_3416

Lynx 4

WST-21-0957B

260.2

263.0

2.8

6.71


LHW_3203

Lynx HW

including

261.0

261.3

0.3

19.6


and

261.7

262.0

0.3

14.4



276.0

281.0

5.0

4.51


LHW_3215

Lynx HW

including

280.0

281.0

1.0

11.1


WST-21-0958A

518.6

520.6

2.0

20.1


LX4_3450

Lynx 4

including

518.6

519.3

0.7

57.3


WST-21-0960

535.0

537.0

2.0

3.85


LX4_3404

Lynx 4

including

536.2

537.0

0.8

8.84



563.7

565.8

2.1

11.6


LX4_3430

Lynx 4

including

564.6

565.2

0.6

40.1



570.4

572.4

2.0

11.7


LX4_3430

Lynx 4

including

571.0

571.6

0.6

37.3


WST-21-0962

80.8

83.0

2.2

6.54


LXM_3307

Lynx

including

81.5

81.8

0.3

47.4



466.0

468.0

2.0

10.7


LX4_3450

Lynx 4

including

466.6

466.9

0.3

59.3


WST-21-0963

168.5

170.6

2.1

83.7

47.4

LXM_3388

Lynx

including

169.4

170.0

0.6

227

100


468.1

470.1

2.0

10.7


LX4_3430

Lynx 4

including

469.0

469.5

0.5

25.5


WST-21-0964

336.0

338.0

2.0

9.93


TLX_3131

Triple Lynx

WST-21-0965A

315.0

317.0

2.0

6.74


TLX_3131

Triple Lynx

WST-21-0968

194.2

196.2

2.0

4.64


TLX_3161

Triple Lynx


217.0

219.0

2.0

4.21


TLX_3169

Triple Lynx

WST-21-0970

173.3

175.3

2.0

19.0


LXM_3388

Lynx

including

173.3

173.7

0.4

94.2



261.4

263.4

2.0

11.8


LHW_3224

Lynx HW

including

261.4

261.9

0.5

39.2


WST-21-0971

58.5

61.0

2.5

5.56


LXM_3339

Lynx


338.2

341.3

3.1

4.19


TLX_3166

Triple Lynx

WST-21-0979

201.0

203.0

2.0

15.6

15.3

TLX_3184

Triple Lynx

including

202.7

203.0

0.3

103

100


231.4

235.6

4.2

5.40


TLX_3161

Triple Lynx

including

231.4

231.7

0.3

48.5


WST-21-0980

180.5

182.6

2.1

10.1


TLX_3161

Triple Lynx

including

180.5

180.9

0.4

52.6



329.0

331.0

2.0

4.37


TLX_3131

Triple Lynx

including

329.8

330.2

0.4

15.9


WST-21-0981

167.0

169.0

2.0

4.51


TLX_3161

Triple Lynx

WST-21-0983

205.0

207.2

2.2

4.21


TLX_3154

Triple Lynx

including

206.8

207.2

0.4

19.3



249.0

251.0

2.0

3.63


TLX_3161

Triple Lynx

WST-21-0987

46.3

48.8

2.5

6.65


TLX_3161

Triple Lynx

WST-21-0993

153.2

155.7

2.5

3.63


TLX_3184

Triple Lynx

including

155.4

155.7

0.3

8.11



177.5

180.7

3.2

4.62


TLX_3161

Triple Lynx

including

177.5

177.9

0.4

15.1


and

180.0

180.7

0.7

11.5



215.0

217.0

2.0

4.71


TLX_3175

Triple Lynx

including

216.5

217.0

0.5

11.3



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

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

864.0

866.0

2.0

16.2


UDD

Underdog

including

864.4

865.0

0.6

53.4


OSK-W-21-1871-W3

849.0

851.5

2.5

5.51


UDD

Underdog

including

851.0

851.5

0.5

20.5


OSK-W-21-2512-W2

539.9

543.0

3.1

3.66


CAE

Caribou

OSK-W-21-2540-W7

963.7

972.6

8.9

21.8

19.4

TLX_3158

Triple Lynx

including

966.1

966.6

0.5

142

100


1111.0

1113.0

2.0

8.46


TLX

Triple Lynx


1125.0

1127.4

2.4

3.55


TLX

Triple Lynx

OSK-W-21-2540-W9

923.0

925.2

2.2

10.9


TLX

Triple Lynx

including

923.8

924.3

0.5

45.4



965.5

967.8

2.3

24.8

21.8

TLX_3158

Triple Lynx

including

967.5

967.8

0.3

123

100

OSK-W-21-2540-W10

990.3

992.7

2.4

17.6


TLX_3158

Triple Lynx


1132.0

1134.0

2.0

5.57


TLX_3172

Triple Lynx


1144.0

1146.0

2.0

7.90


TLX_3172

Triple Lynx

OSK-W-21-2540-W11

992.7

995.0

2.3

23.9


TLX_3158

Triple Lynx

including

993.1

994.1

1.0

53.3


OSK-W-21-2587-W2

527.5

529.6

2.1

3.59


LXM

Lynx

including

527.5

527.9

0.4

13.6


OSK-W-21-2601

992.7

995.3

2.6

124

38.5

TLX_3158

Triple Lynx

including

994.2

994.9

0.7

418

100

OSK-W-21-2601-W2

883.9

886.0

2.1

10.5


TLX

Triple Lynx

including

883.9

884.5

0.6

36.6



978.3

981.1

2.8

32.6


TLX_3158

Triple Lynx

OSK-W-21-2601-W3

944.0

946.0

2.0

13.0


TLX_3158

Triple Lynx

OSK-W-21-2635

297.0

299.0

2.0

13.9


CAE

Caribou

including

297.0

298.0

1.0

27.7


OSK-W-21-2636

712.0

714.3

2.3

3.52


UDD

Underdog

including

714.0

714.3

0.3

12.4


OSK-W-21-2637

569.0

571.0

2.0

31.3


CAE

Caribou

including

570.2

571.0

0.8

77.8


WST-21-0708

239.0

241.3

2.3

11.0


TLX

Triple Lynx

including

240.0

240.7

0.7

35.8


WST-21-0754

150.6

153.8

3.2

6.83


LXM

Lynx

including

152.5

152.9

0.4

21.4


WST-21-0913

150.9

153.0

2.1

15.9


LXM

Lynx

including

150.9

151.7

0.8

41.6


WST-21-0914

384.5

387.0

2.5

6.59


LSW

Lynx SW

including

385.2

385.8

0.6

26.8


WST-21-0927

398.0

400.0

2.0

4.78


TLX

Triple Lynx

WST-21-0929B

193.6

196.0

2.4

30.3


TLX

Triple Lynx

including

194.7

195.2

0.5

69.5


WST-21-0931

456.1

459.1

3.0

9.87


TLX

Triple Lynx

WST-21-0935

265.7

268.0

2.3

449

17.5

LHW

Lynx HW

including

266.6

267.0

0.4

2580

100

WST-21-0936A

398.0

400.1

2.1

3.99


TLX

Triple Lynx

WST-21-0943

153.8

156.0

2.2

4.87


LXM

Lynx

including

154.1

154.7

0.6

16.6


WST-21-0944

258.0

260.2

2.2

4.05


LHW

Lynx HW

WST-21-0960

402.2

404.5

2.3

5.59


LX4

Lynx 4

including

402.2

402.6

0.4

21.5


WST-21-0962

187.0

189.0

2.0

14.5


LXM

Lynx

including

188.0

188.4

0.4

52.1



402.0

404.0

2.0

18.9


TLX

Triple Lynx


419.0

421.2

2.2

8.19


TLX

Triple Lynx

including

419.9

420.4

0.5

35.1



639.0

641.3

2.3

6.98


LX4

Lynx 4

WST-21-0964

312.3

314.7

2.4

7.87


TLX

Triple Lynx

including

313.7

314.2

0.5

33.9


WST-21-0966

371.0

373.1

2.1

3.45


LHW_3233

Lynx HW

including

372.5

372.8

0.3

21.4


WST-21-0969

331.0

333.0

2.0

4.65


TLX

Triple Lynx

including

331.0

332.0

1.0

9.21



480.0

482.1

2.1

4.36


LX4

Lynx 4


536.8

539.0

2.2

11.5


LX4

Lynx 4

including

536.8

537.8

1.0

25.0


WST-21-0971

467.0

469.0

2.0

7.40


LX4

Lynx 4

including

467.0

467.9

0.9

16.3



479.0

482.0

3.0

4.82


LX4

Lynx 4

WST-21-0981

192.4

195.3

2.9

7.36


TLX

Triple Lynx

including

192.4

193.0

0.6

24.2


WST-21-0993

160.0

162.1

2.1

12.7


TLX

Triple Lynx

including

161.1

162.1

1.0

26.1



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

Drill hole location

Hole No.

Azimuth
(°)


Dip
(°)


Length
(m)


UTM E

UTM N

Elevation

Section

OSK-W-21-1871-W1

331

-56

1119

452496

5434397

402

2475

OSK-W-21-1871-W3

331

-56

906

452496

5434397

402

2475

OSK-W-21-1949-W10

105

-57

1317

453440

5435479

401

3825

OSK-W-21-1949-W13

105

-57

1212

453440

5435479

401

3825

OSK-W-21-1949-W15

105

-57

1305

453440

5435479

401

3825

OSK-W-21-1949-W16

105

-57

1014

453440

5435479

401

3825

OSK-W-21-1963-W10

123

-58

1451

453761

5435816

401

4275

OSK-W-21-2512-W2

331

-54

834

452448

5434465

400

2475

OSK-W-21-2512-W3

331

-54

819

452448

5434465

400

2475

OSK-W-21-2531-W3

344

-62

1329

452566

5434415

403

2550

OSK-W-21-2540-W7

117

-60

1152

453465

5435640

410

3925

OSK-W-21-2540-W9

117

-60

1349

453465

5435640

410

3925

OSK-W-21-2540-W10

117

-60

1181

453465

5435640

410

3925

OSK-W-21-2540-W11

117

-60

1028

453465

5435640

410

3925

OSK-W-21-2544-W1

128

-50

1140

452960

5435539

419

3425

OSK-W-21-2544-W3

128

-50

810

452960

5435539

419

3425

OSK-W-21-2578

350

-53

942

452178

5434397

399

2200

OSK-W-21-2587-W2

127

-59

1167

453350

5435673

418

3850

OSK-W-21-2601

125

-61

1500

453425

5435657

413

3900

OSK-W-21-2601-W2

125

-61

1500

453425

5435657

413

3900

OSK-W-21-2601-W3

125

-61

1305

453425

5435657

413

3900

OSK-W-21-2635

327

-56

708

452684

5434475

402

2675

OSK-W-21-2636

337

-52

801

452499

5434619

403

2575

OSK-W-21-2637

140

-59

747

452768

5435312

406

3150

OSK-W-21-2640-W1

336

-58

737

452683

5434351

402

2625

OSK-W-21-2646

109

-58

1272

453326

5435648

413

3800

WST-21-0708

134

-40

670

453374

5435296

-26

3675

WST-21-0754

151

-44

220

453356

5435272

16

3650

WST-21-0878

128

-40

711

453375

5435297

-26

3675

WST-21-0879

139

-44

724

453258

5435209

96

3525

WST-21-0881A

147

-57

457

453105

5435065

231

3325

WST-21-0883

126

-59

393

453105

5435065

231

3325

WST-21-0894B

132

-52

417

452955

5435004

253

3175

WST-21-0896

140

-47

741

453258

5435209

96

3525

WST-21-0897A

127

-42

699

453375

5435297

-26

3675

WST-21-0905C

141

-52

511

453221

5435121

135

3450

WST-21-0908C

122

-44

664

453506

5435326

-90

3800

WST-21-0911

121

-44

635

453507

5435332

-48

3800

WST-21-0912

141

-41

640

453258

5435209

96

3525

WST-21-0913

138

-49

594

453322

5435236

54

3600

WST-21-0914

148

-59

502

453105

5435066

231

3325

WST-21-0919

141

-46

597

453257

5435209

96

3525

WST-21-0924A

151

-29

138

453314

5435164

124

3550

WST-21-0927

146

-48

751

453321

5435235

54

3600

WST-21-0928

154

-70

391

453507

5435327

-7

3800

WST-21-0929B

115

-46

771

453506

5435327

-90

3800

WST-21-0931

144

-50

603

453321

5435235

54

3600

WST-21-0932

136

-26

360

453461

5435326

32

3775

WST-21-0933A

131

-52

733

453222

5435121

135

3450

WST-21-0935

132

-10

283

453462

5435326

33

3775

WST-21-0936A

137

-48

570

453257

5435209

96

3525

WST-21-0937

147

-25

127

453314

5435164

124

3550

WST-21-0943

151

-55

388

453507

5435327

-7

3800

WST-21-0944

116

-8

325

453462

5435326

33

3775

WST-21-0946

168

-51

403

453507

5435327

-7

3800

WST-21-0948

136

-31

583

453374

5435296

-26

3675

WST-21-0957B

120

-9

306

453462

5435326

33

3775

WST-21-0958A

141

-49

579

453321

5435235

54

3600

WST-21-0960

116

-42

600

453506

5435327

-90

3800

WST-21-0962

132

-49

685

453222

5435122

135

3450

WST-21-0963

121

-36

543

453507

5435333

-47

3800

WST-21-0964

127

-38

684

453374

5435297

-26

3675

WST-21-0965A

141

-49

344

453507

5435327

-7

3800

WST-21-0966

145

-28

390

453461

5435326

32

3775

WST-21-0968

183

-48

243

453358

5435296

-148

3675

WST-21-0969

133

-52

639

453321

5435235

54

3600

WST-21-0970

117

-34

519

453507

5435333

-47

3800

WST-21-0971

139

-62

615

453222

5435121

135

3450

WST-21-0979

178

-55

255

453358

5435296

-149

3675

WST-21-0980

131

-38

681

453374

5435297

-26

3675

WST-21-0981

174

-51

258

453358

5435296

-149

3675

WST-21-0983

176

-59

279

453358

5435297

-149

3675

WST-21-0987

154

-4

73

453440

5435223

-157

3700

WST-21-0993

191

-28

231

453357

5435296

-148

3675


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.

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 2,500 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