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Osisko Intersects 114 g/t Au Over 2.8 Metres at Osborne-Bell

2019 Infill Drill Program Completed

TORONTO, Sept. 03, 2019 (GLOBE NEWSWIRE) -- Osisko Mining Inc. (OSK:TSX. "Osisko" or the "Corporation") is pleased to provide new results from the infill drill program at its 100% owned Osborne-Bell gold deposit located 15 kilometres northwest of the town of Lebel-sur-Quévillon, Québec. The 50,000-metre program focused on infill drilling at the Osborne-Bell deposit as part of the overall Windfall definition drilling program. Osborne-Bell remains open at depth with good potential for further expansion, and additional exploration drilling is being planned for 2020.

Significant new analytical results from 71 intercepts in 47 infill drill holes are presented below. Highlights from the new results include: 114 g/t Au over 2.8 metres in OSK-OB-19- 109; 51.5 g/t Au over 2.8 metres in OSK-OB-19-212; 35.3 g/t Au over 2.7 metres in OSK-OB-192; 9.49 g/t Au over 7.6 metres in OSK-OB-19-131; and 9.60 g/t Au over 4.8 metres in OSK-OB-19-137. Maps showing hole locations and full analytical results are available at www.osiskomining.com.

Drill Hole

From
(m)

To
(m)

Length
(m)

Au
(g/t) uncut

Au
(g/t) cut to 100 g/t

Type

Mineralized
Zone

OSK-OB-18-092

40.0

43.2

3.2

7.78

Infill

3-653

including

42.9

43.2

0.3

59.4

Infill

OSK-OB-18-092

111.5

113.5

2.0

3.37

Infill

3-652

OSK-OB-18-092

132.3

134.5

2.2

10.4

Infill

New

including

132.8

133.2

0.4

43.0

Infill

OSK-OB-18-094

165.5

168.5

3.0

5.55

Infill

3-653

including

167.0

168.5

1.5

10.6

Infill

OSK-OB-18-094

180.5

182.5

2.0

9.25

Infill

3-652

including

181.6

182.2

0.6

23.0

Infill

OSK-OB-18-095

121.2

124.0

2.8

5.04

Infill

3-551

including

121.2

121.9

0.7

18.1

Infill

OSK-OB-18-100

233.2

235.8

2.6

3.41

Infill

3-551

including

234.0

234.3

0.3

25.1

Infill

OSK-OB-18-103

203.6

205.6

2.0

6.93

Infill

2-652

including

204.6

204.9

0.3

39.3

Infill

OSK-OB-19-105

18.0

21.0

3.0

4.47

Infill

New

including

18.0

18.3

0.3

41.4

Infill

OSK-OB-19-105

130.9

133.3

2.4

3.71

Infill

3-651

including

130.9

131.4

0.5

16.0

Infill

OSK-OB-19-106

23.7

25.7

2.0

4.82

Infill

3-552

including

23.7

24.0

0.3

16.9

Infill

OSK-OB-19-109

282.4

286.2

2.8

114

30.7

Infill

3-652

including

284.4

285.2

0.8

392

100

Infill

OSK-OB-19-110

92.0

94.0

2.0

3.16

Infill

1-651

OSK-OB-19-110

224.8

226.8

2.0

3.63

Infill

1-550

OSK-OB-19-113

46.7

48.9

2.2

15.9

Infill

1-653

including

46.7

48.1

1.4

24.8

Infill

OSK-OB-19-117

38.9

41.0

2.1

6.38

Infill

1-651

including

39.4

39.7

0.3

38.6

Infill

OSK-OB-19-119

89.6

91.7

2.1

34.8

Infill

New

including

90.6

91.3

0.7

94.2

Infill

OSK-OB-19-120

150.4

153.4

3.0

5.10

Infill

1-652

including

150.4

151.0

0.6

23.8

Infill

OSK-OB-19-122

80.1

82.2

2.1

3.25

Infill

1-653

including

81.8

82.2

0.4

11.8

Infill

OSK-OB-19-125

209.1

211.1

2.0

4.27

Infill

2-652

including

210.1

211.1

1.0

7.95

Infill

OSK-OB-19-129

328.1

330.5

2.4

4.36

Infill

2-650

including

328.1

329.0

0.9

9.85

Infill

OSK-OB-19-131

266.4

274

7.6

9.49

Infill

2-652

including

266.7

267.1

0.4

82.8

Infill

and

270.2

271.0

0.8

20.0

Infill

and

272.3

273.1

0.8

19.1

Infill

OSK-OB-19-131

335.0

337.9

2.9

4.16

Infill

2-651

OSK-OB-19-131

351.7

357.4

5.7

5.31

Infill

2-650

including

351.7

355.0

3.3

8.03

Infill

OSK-OB-19-132

77.8

80.0

2.2

3.07

Infill

New

OSK-OB-19-132

252.5

254.9

2.4

5.61

Infill

2-652

including

254.6

254.9

0.3

16.5

Infill

OSK-OB-19-137

96.2

101.0

4.8

9.60

Infill

OSK-OB-19-138

295.1

297.1

2.0

7.94

Infill

3-551

including

295.1

295.5

0.4

37.7

Infill

OSK-OB-19-138

360.5

365.0

4.5

7.36

Infill

3-652

OSK-OB-19-144

39.3

42.0

2.7

8.30

Infill

1-652

including

40.2

41.0

0.8

12.0

Infill

OSK-OB-19-144

118.0

120.3

2.3

3.51

Infill

1-551

including

118.3

119.0

0.7

8.72

Infill

OSK-OB-19-144

166.3

168.5

2.2

4.57

Infill

1-651

including

166.3

167.0

0.7

12.4

Infill

OSK-OB-19-144

183.3

185.6

2.3

5.10

Infill

1-651

including

185.1

185.6

0.5

21.0

Infill

OSK-OB-19-145

119.5

123.0

3.5

5.93

Infill

1-653

including

120.5

121.0

0.5

24.7

Infill

OSK-OB-19-146

71.5

74.1

2.6

10.2

Infill

1-551

including

73.5

74.1

0.6

40.1

Infill

OSK-OB-19-151

41.2

43.4

2.2

13.4

Infill

1-652

including

41.2

41.8

0.6

40.3

Infill

OSK-OB-19-151

123.4

126.0

2.6

10.5

Infill

New

including

123.4

124.2

0.8

25.5

Infill

OSK-OB-19-151

137.3

139.5

2.2

23.7

Infill

1-651

including

138.9

139.5

0.6

49.0

Infill

OSK-OB-19-155

191.0

194.2

3.2

6.48

Infill

3-551

OSK-OB-19-156

21.0

23.5

2.5

3.55

Infill

New

OSK-OB-19-159

542.0

544.0

2.0

3.82

Infill

3-653

OSK-OB-19-160

108.0

110.1

2.1

3.80

Infill

1-653

including

109.0

109.6

0.6

12.6

Infill

OSK-OB-19-161

288.7

290.7

2.0

5.76

Infill

New

including

289.7

290.7

1.0

11.3

Infill

OSK-OB-19-162

328.5

330.6

2.1

3.84

Infill

3-552

including

329.9

330.6

0.7

10.2

Infill

OSK-OB-19-162

362.7

365.3

2.6

12.0

Infill

3-653

including

363

363.5

0.5

61.0

Infill

OSK-OB-19-162

369.3

371.8

2.5

6.89

Infill

3-653

including

369.9

370.8

0.9

17.8

Infill

OSK-OB-19-164

171.1

173.1

2.0

5.74

Infill

New

including

172.1

172.6

0.5

21.9

Infill

OSK-OB-19-170

95.4

97.6

2.2

3.02

Infill

1-653

including

96.3

96.9

0.6

10.7

Infill

OSK-OB-19-171

48.6

51.0

2.4

11.0

Infill

3-652

including

48.6

49.0

0.4

64.5

Infill

OSK-OB-19-175

214.3

218.0

3.7

8.54

Infill

2-652

including

214.3

215.4

1.1

23.8

Infill

OSK-OB-19-176

379.4

382.0

2.6

6.47

Infill

3-653

including

379.4

380.0

0.6

25.1

Infill

OSK-OB-19-178

94.2

96.2

2.0

8.20

Infill

3-653

including

94.7

95.4

0.7

23.1

Infill

OSK-OB-19-180

414.5

416.5

2.0

6.00

Infill

New

including

416.2

416.5

0.3

35.1

Infill

OSK-OB-19-182

93.0

95.0

2.0

3.77

Infill

3-653

OSK-OB-19-186

311.8

313.8

2.0

3.10

Infill

3-551

including

312.8

313.2

0.4

10.9

Infill

OSK-OB-19-191

291.7

294.0

2.3

4.55

Infill

3-654

including

292.0

292.7

0.7

13.2

Infill

OSK-OB-19-192

374.9

377.6

2.7

35.3

23.3

Infill

3-551

including

375.7

376.1

0.4

180

100

Infill

OSK-OB-19-192

415.0

418.0

3.0

9.70

Infill

3-653

including

416.1

416.8

0.7

34.8

Infill

OSK-OB-19-194

249.0

251.0

2.0

3.03

Infill

New

OSK-OB-19-194

261.9

265.7

3.8

3.23

Infill

3-552

including

261.9

262.2

0.3

34.0

Infill

OSK-OB-19-194

339.2

342.0

2.8

3.46

Infill

3-650

including

340.0

341.1

1.1

7.71

Infill

OSK-OB-19-196

217.1

219.3

2.2

3.23

Infill

3-552

including

218.7

219.3

0.6

9.58

Infill

OSK-OB-19-196

223.8

226.3

2.5

13.0

Infill

3-552

OSK-OB-19-196

228.7

231.8

3.1

3.16

Infill

3-552

including

228.7

229.0

0.3

12.3

Infill

OSK-OB-19-196

244.2

248.0

3.8

3.06

Infill

3-551

including

246.8

247.1

0.3

17.4

Infill

OSK-OB-19-201

375.1

377.2

2.1

8.00

Infill

3-551

including

375.1

376.2

1.1

14.7

Infill

OSK-OB-19-204

323.5

325.5

2.0

7.70

Infill

3-552

including

324.5

325.5

1.0

15.0

Infill

OSK-OB-19-212

237.2

240.7

3.5

3.34

Infill

3-552

including

237.2

237.7

0.5

11.9

Infill

OSK-OB-19-212

260.7

267.7

7.0

3.62

Infill

3-552

including

260.7

261.7

1.0

21.4

Infill

OSK-OB-19-212

310.3

313.1

2.8

51.5

22.6

Infill

3-653

including

310.3

310.9

0.6

235

100

Infill

OSK-OB-19-213

295.0

297.0

2.0

10.7

Infill

3-551

including

295.0

296.0

1.0

20.3

Infill


Drill Hole

Azimuth (°)

Dip (°)

Hole
Length (m)

UTM E

UTM N

Section

OSK-OB-18-092

186.6

-45.1

135

341231

5444068

2200

OSK-OB-18-094

191.8

-45.8

237

341399

5444051

2375

OSK-OB-18-095

192.5

-45.0

254

341315

5444119

2275

OSK-OB-18-100

193.7

-45.3

261

341564

5444064

2525

OSK-OB-18-103

198.2

-49.0

221

341216

5444136

2175

OSK-OB-19-105

197.3

-47.8

135

341448

5443963

2450

OSK-OB-19-106

194.9

-45.0

132

341470

5443930

2475

OSK-OB-19-109

192.3

-47.4

297

341247

5444210

2175

OSK-OB-19-110

193.5

-51.5

303

340670

5444222

1625

OSK-OB-19-113

19.6

-46.8

101

340918

5444078

1900

OSK-OB-19-117

193.5

-45.0

86

340724

5444158

1700

OSK-OB-19-119

193.8

-45.8

92

340695

5444371

1600

OSK-OB-19-120

194.4

-59.7

251

340570

5444500

1450

OSK-OB-19-122

200.5

-59.6

110

340607

5444458

1500

OSK-OB-19-125

193.8

-51.0

236

341104

5444163

2050

OSK-OB-19-129

185.1

-50.5

371

341106

5444186

2050

OSK-OB-19-131

192.1

-49.5

418

341137

5444214

2075

OSK-OB-19-132

185.0

-50.0

407

341067

5444223

2000

OSK-OB-19-137

186.9

-46.0

277

341050

5444092

2025

OSK-OB-19-138

193.3

-53.0

416

341342

5444237

2275

OSK-OB-19-144

209.5

-52.7

247

340877

5444157

1850

OSK-OB-19-145

192.7

-49.3

358

340775

5444340

1700

OSK-OB-19-146

203.5

-45.0

208

340864

5444140

1825

OSK-OB-19-151

194.2

-54.2

173

340810

5444186

1775

OSK-OB-19-155

199.4

-54.2

270

341326

5444146

2275

OSK-OB-19-156

194.9

-60.6

111

340540

5444476

1425

OSK-OB-19-159

183.4

-53.3

612

341329

5444403

2200

OSK-OB-19-160

193.8

-60.4

144

340527

5444519

1400

OSK-OB-19-161

192.8

-51.1

299

341885

5443933

2875

OSK-OB-19-162

188.0

-53.4

414

341496

5444173

2425

OSK-OB-19-164

193.7

-61.3

210

340542

5444543

1400

OSK-OB-19-170

253.8

-50.0

156

340637

5444451

1525

OSK-OB-19-171

196.6

-52.0

75

341238

5444025

2225

OSK-OB-19-175

209.9

55.2

240

341250

5444123

2200

OSK-OB-19-176

184.5

-55.8

407

341496

5444174

2425

OSK-OB-19-178

196.6

-53.5

168

341269

5444081

2225

OSK-OB-19-180

183.6

-58.8

438

341496

5444176

2425

OSK-OB-19-182

195.0

-54.0

116

341899

5443811

2925

OSK-OB-19-186

200.1

-59.9

333

341573

5444083

2525

OSK-OB-19-191

198.0

-66.0

383

341573

5444083

2525

OSK-OB-19-192

187.5

-59.1

432

341497

5444176

2425

OSK-OB-19-194

187.9

-49.8

356

341527

5444095

2275

OSK-OB-19-196

189.5

-50.5

285

341512

5444080

2475

OSK-OB-19-201

189.4

-50.6

469

341443

5444262

2350

OSK-OB-19-204

182.2

-53.4

419

341455

5444178

2400

OSK-OB-19-212

184.9

-56.2

380

341467

5444113

2425

OSK-OB-19-213

189.9

-53.4

370

341378

5444214

2300

OSK-OB-18-092 intersected 7.78 g/t Au over 3.2 metres in zone 3-653. Mineralization is hosted in a chlorite altered andesite unit and consists of up to 2% pyrite stringers and 1% clustered chalcopyrite oriented parallel to the main fabric orientation. A second interval returned 3.37 g/t Au over 2.0 metres in zone 3-652, Mineralization is hosted in a sericite and silica altered quartz-phyric rhyodacite and up to 1% clustered pyrite oriented parallel to the main fabric orientation. A third interval returned 10.4 g/t Au over 2.2 metres. This mineralized interval does not correspond to a known zone. Mineralization is hosted in a silica and chlorite altered quartz-phyric rhyodacite unit with up to 2% pyrite stringers and traces of chalcopyrite clusters oriented parallel to the main fabric orientation.

OSK-OB-18-094 intersected 5.55 g/t Au over 3.0 metres in zone 3-653. Mineralization is hosted in a sericite and silica altered quartz-phyric rhyodacite unit and consists of up to 1% clustered pyrite and traces of pyrite stringers oriented parallel to the main fabric orientation. A second interval returned 9.25 g/t Au over 2.0 metres in zone 3-652. Mineralization consists of 5% pyrite stringers and 1% disseminated pyrite in a sericite altered zone within quartz-pyrite veinlets hosted in a quartz-phyric rhyodacite unit.

OSK-OB-18-095 intersected 5.04 g/t Au over 2.8 metres in zone 3-551. Mineralization is hosted in a chlorite-biotite-carbonate altered andesite unit and consists of traces of chalcopyrite and pyrite stringers oriented parallel to the main fabric orientation.

OSK-OB-18-100 intersected 3.41 g/t Au over 2.6 metres in zone 3-551. Mineralization is hosted within a sericite and hematite altered quartz-phyric rhyodacite and consists of 3 to 5% pyrite and traces of disseminated and stringer-style chalcopyrite associated with chlorite-silica altered veinlets parallel to the main fabric orientation.

OSK-OB-18-103 intersected 6.93 g/t Au over 2.0 metres in zone 2-652. Mineralization is hosted in a sericite-biotite-chlorite altered quartz-phyric rhyodacite unit and consists of up to 3% pyrite, 1% disseminated chalcopyrite, and local visible gold in chlorite-pyrite veinlets.

OSK-OB-19-105 intersected 4.47 g/t Au over 3.0 metres. This mineralized interval does not correspond to a known zone. Mineralization is hosted within a chlorite-biotite altered andesite with up to 1% disseminated pyrite in chlorite-pyrite veins or pyrite stringers oriented parallel to the main fabric orientation. A second interval returned 3.71 g/t Au over 2.4 metres in zone 3-651. Mineralization consists of up to 2% pyrite mainly as local stringers and disseminated within a biotite-sericite-chlorite altered aphyric rhyodacite.

OSK-OB-19-106 intersected 4.82 g/t Au over 2.0 metres in zone 3-552. Mineralization consists of up to 3% pyrite as cm-thick stringers, chlorite-pyrite veins, and disseminated with minor pyrrhotite parallel to the main fabric orientation. Mineralization is hosted within a sericite and chlorite altered andesite unit.

OSK-OB-19-109 intersected 114 g/t Au over 2.8 metres in zone 3-652. Mineralization is hosted within a quartz-phyric rhyodacite characterized by a moderate chlorite, biotite and carbonate alteration. Mineralization consists of an average of 5% disseminated pyrite, and up to 15% disseminated pyrite-sphalerite and stringers on a 0.8 metre interval. Local visible gold was observed in the pyrite-sphalerite stringers. Local chlorite-pyrite veins also carry up to 1% finely disseminated pyrite.

OSK-OB-19-110 intersected 3.16 g/t Au over 2.0 metres in zone 1-651. Mineralization consists of up to 2% disseminated pyrite hosted within a quartz-feldspar-phyric rhyodacite showing moderate patchy biotite and chlorite alteration. A second interval returned 3.63 g/t Au over 2.0 metres in zone 1-550. Mineralization is hosted in a chlorite-biotite-sericite altered andesite unit and consists of 3% disseminated pyrite oriented parallel to the main fabric orientation.

OSK-OB-19-113 intersected 15.9 g/t Au over 2.2 metres in zone 1-653. Mineralization is controlled by a quartz veinlet characterized by chalcopyrite clusters and stringers hosted within a sericite, carbonate, and minor silica altered aphyric rhyodacite containing up to 1% disseminated pyrite.

OSK-OB-19-117 intersected 6.38 g/t Au over 2.1 metres in zone 1-651. Mineralization is hosted within an andesite unit with strong biotite and weak chlorite and sericite alteration. Mineralization consists of up to 5% pyrite stringers, clusters, and dissemination.

OSK-OB-19-119 intersected 34.8 g/t Au over 2.1 metres. This mineralized interval does not correspond to a known zone. Mineralization is hosted in a biotite and chlorite altered andesite and consists of 1% disseminated pyrite and pyrrhotite orientated parallel to the main fabric orientation.

OSK-OB-19-120 intersected 5.10 g/t Au over 3.0 metres in zone 1-652. Mineralization is hosted within a weakly chlorite-carbonate-sericite-epidote altered andesite with up to 5% disseminated pyrite controlled by the main fabric orientation and associated with chlorite-pyrite veinlets.

OSK-OB-19-122 intersected 3.25 g/t Au over 2.1 metres in zone 1-653. Mineralization is hosted in a chlorite-biotite-carbonate altered andesite unit with up to 3% disseminated and clustered pyrite parallel to the main fabric orientation and pyrite clusters within quartz-chlorite-carbonate veins.

OSK-OB-19-125 intersected 4.27 g/t Au over 2.0 metres in zone 2-652. Mineralization is hosted at the contact between an andesite unit and a quartz-phyric rhyodacite unit moderately altered to chlorite-biotite-silica±sericite±carbonate. Mineralization consists of up to 3% disseminated, clustered, and stringer pyrite affected by the main fabric orientation.

OSK-OB-19-129 intersected 4.36 g/t Au over 2.4 metres in zone 2-650. Mineralization is hosted within a biotite-chlorite-sericite altered andesite and consists of trace to 1% disseminated pyrite.

OSK-OB-19-131 intersected 9.49 g/t Au over 7.6 metres in zone 2-652.This interval is hosted at the contact zone between an aphyric rhyodacite, andesite, and quartz-phyric rhyodacite unit. Felsic units show moderate sericite alteration and intermediate units show weak to moderate sericite-chlorite-biotite alteration. Mineralization consists of up to 5% disseminated or stringer-style pyrite parallel to the main fabric orientation. High-grade samples are associated with metre-scale intervals consisting of up to 1% disseminated and stringer-style sphalerite and chalcopyrite. Local visible gold was observed within the quartz-phyric rhyodacite unit. A second interval returned 4.16 g/t Au over 2.9 metres in zone 2-651. Mineralization is hosted within a sericite and chlorite altered quartz-phyric rhyodacite and consists of traces of clustered pyrite elongated along the main fabric orientation and traces of clustered sphalerite within veinlets. A third interval returned 5.31 g/t Au over 5.7 metres in zone 2-650. Mineralization is hosted within a weakly sericite-silica-chlorite altered andesite unit and consists of up to 15% clustered pyrite and traces of sphalerite parallel and cross-cutting the main fabric orientation.

OSK-OB-19-132 intersected 3.07 g/t Au over 2.2 metres. This mineralized interval does not correspond to any known zone. Mineralization is hosted in a chlorite-carbonate-biotite altered andesite unit and consists of 3% clustered pyrite within a series of 5cm-thick quartz veins. A second interval returned 5.61 g/t Au over 2.4 metres in zone 2-652. Mineralization is hosted within a weakly to moderately sericite-chlorite-carbonate altered quartz-phyric rhyodacite. Mineralization is composed of up to 1% disseminated pyrite parallel to the main fabric orientation and hosted in veinlets.

OSK-OB-19-137 intersected 9.60 g/t Au over 4.8 metres in zone 2-652. Mineralization is hosted within a sericite and chlorite altered quartz-phyric rhyodacite and consists of 1% disseminated pyrite and 1% pyrite stringers associated with chlorite and oriented parallel and locally secant to the main fabric orientation.

OSK-OB-19-138 intersected 7.94 g/t Au over 2.0 metres in zone 3-551. Mineralization is hosted in a chlorite-biotite-sericite altered andesite unit and generally consists of 1% disseminated pyrite and up to 1% disseminated chalcopyrite oriented parallel to the main fabric orientation. The high-grade mineralized interval consists of up to 7% clustered chalcopyrite and pyrite oriented parallel to the main fabric orientation. A second interval returned 7.36 g/t Au over 4.5 metres in zone 3-652. Mineralization is hosted in a sericite-chlorite-silica altered rhyodacite unit and consists of 3% pyrite stringers (0.5-2 cm-thick) associated with traces of disseminated chalcopyrite, and up to 1% disseminated pyrite oriented parallel to the main fabric orientation. The pyrite stringers can be either low core-angled or parallel to the main fabric.

OSK-OB-19-144 intersected 8.30 g/t Au over 2.7 metres in zone 1-652. Mineralization is hosted within a biotite and sericite altered quartz-phyric rhyodacite and consists of up to 1% disseminated pyrite associated with carbonate-chlorite-pyrite veins or pyrite clusters. A second interval returned 3.51 g/t Au over 2.3 metres in zone 1-551, a third interval returned 4.57 g/t Au over 2.2 metres in zone 1-651, and a fourth interval returned 5.10 g/t Au over 2.3 metres in zone 1-651.

OSK-OB-19-145 intersected 5.93 g/t Au over 3.5 metres in zone 1-653. Mineralization is hosted within a chlorite-biotite-carbonate and potassic-feldspar altered andesite composed of up to 4% clustered pyrite with traces of clustered chalcopyrite within pyrite-chlorite veins and 2-8% disseminated and clustered pyrite parallel to the main fabric orientation.

OSK-OB-19-146 intersected 10.2 g/t Au over 2.6 metres in zone 1-551. Mineralization is hosted in a biotite-sericite-chlorite altered andesite and consists of up to 4% disseminated and clustered pyrite parallel to the main fabric orientation. Local visible gold was observed in smoky quartz-pyrite veinlets cross-cutting the main fabric.

OSK-OB-19-151 intersected 13.4 g/t Au over 2.2 metres in zone 1-652. Mineralization is hosted within a biotite-sericite-chlorite-carbonate altered andesite and consists of up to 2% disseminated pyrite and pyrite stringers oriented parallel to the main fabric orientation. Additionally, local visible gold is observed in chlorite-pyrite veins. A second interval returned 10.5 g/t Au over 2.6 metres. This interval does not correspond to any known zone. Mineralization is hosted within a sericite-biotite-chlorite±silica altered andesite and is composed of up to 4% disseminated pyrite in stringers or within the host rock, and oriented parallel to the main fabric orientation. A third interval returned 23.7 g/t Au over 2.2 metres in zone 1-651. Mineralization is hosted within a biotite-sericite-chlorite-carbonate altered andesite and consists of up to 8% pyrite stringers associated with 15% low core angle and undulating chlorite-pyrite veins. Additionally, up to 2% disseminated pyrite and traces of disseminated chalcopyrite are hosted within veinlets as well as disseminated within the host rock.

OSK-OB-19-155 intersected 6.48 g/t Au over 3.2 metres in zone 3-551. Mineralization is hosted within a hematite-chlorite-sericite-carbonate altered andesite and consists of up to 1% disseminated pyrite within quartz veinlets (first interval), up to 1% clustered pyrite oriented parallel to the main fabric orientation, and up to 1% clustered chalcopyrite and sphalerite within quartz veinlets.

OSK-OB-19-156 intersected 3.55 g/t Au over 2.5 metres. The mineralized interval does not correspond to a known zone. Mineralization is hosted in a chlorite-biotite-sericite altered andesite unit and consists of up to 10% clustered pyrite in a 1.5cm-thick quartz vein.

OSK-OB-19-159 returned 3.82 g/t Au over 2.0 metres in zone 3-653. Mineralization is hosted within a sericite-biotite altered andesite and consists of up to 2% disseminated and clustered pyrite and pyrite stringers associated with traces of chalcopyrite generally oriented parallel to the main fabric orientation.

OSK-OB-19-160 intersected 3.80 g/t over 2.1 metres in zone 1-653. Mineralization is hosted within a sericite-biotite-carbonate-chlorite altered andesite and consists of up to 1% disseminated and clustered pyrite oriented parallel to the main fabric orientation and within folded chlorite-pyrite veins.

OSK-OB-19-161 intersected 5.76 g/t Au over 2.0 metres. This mineralized interval does not correspond to any known zone. Mineralization is found at the contact between a biotite-sericite-chlorite altered andesite and a sericite-chlorite altered quartz-phyric rhyodacite unit. Mineralization consists of up to 2% disseminated, clustered, and stringer-style pyrite, and associated with local chlorite-pyrite veins. The host rock shows a strongly developed schistosity.

OSK-OB-19-162 intersected 3.84 g/t Au over 2.1 metres in zone 3-552. Mineralization is hosted in a sericite-silica-chlorite altered aphyric rhyodacite, composed of up to 2% disseminated pyrite and pyrite stringers oriented parallel to the main fabric orientation, up to 1% pyrite in fine stockwork-like fractures, and locally associated with chlorite-pyrite veinlets. A second interval returned 12.0 g/t Au over 2.6 metres in zone 3-653, and a third interval returned 6.89 g/t Au over 2.5 metres in zone 3-653.

OSK-OB-19-164 intersected 5.74 g/t Au over 2.0 metres. This mineralized interval does not correspond to a known zone. Mineralization is hosted within a chlorite-sericite-biotite altered andesite and consists of up to 3% clustered pyrite oriented parallel to the main fabric orientation and up to 5% pyrite stringers (up to 2cm-thick) with traces of chalcopyrite cross-cutting the main fabric.

OSK-OB-19-170 intersected 3.02 g/t Au over 2.2 metres in zone 1-653. Mineralization is hosted in a chlorite-sericite-biotite altered andesite and consists of up to 4% pyrite stringers oriented parallel to the main fabric orientation.

OSK-OB-19-171 intersected 11.0 g/t Au over 2.4 metres in zone 3-652. Mineralization is hosted within a biotite-chlorite-sericite altered andesite near the contact with a quartz-phyric rhyodacite unit. The interval consists of 1% weakly deformed chalcopyrite-pyrite-pyrrhotite stringers and up to 1% disseminated pyrite within chlorite-carbonate veinlets mostly cross-cutting the main fabric orientation.

OSK-OB-19-175 intersected 8.54 g/t Au over 3.7 metres in zone 2-652. Mineralization is hosted within a sericite-silica-biotite altered fragmental rhyodacite and consists of up to 5% disseminated pyrite and pyrite stringers, traces to 1% disseminated chalcopyrite, and locally disseminated pyrrhotite.

OSK-OB-19-176 intersected 6.47 g/t Au over 2.6 metres in zone 3-653. Mineralization is hosted in a sericite-chlorite-biotite altered aphyric rhyodacite and consists of up to 4% clustered pyrite and 3% clustered chalcopyrite associated with veinlets, and 2% disseminated pyrite oriented parallel to the main fabric orientation.

OSK-OB-19-178 intersected 8.20 g/t Au over 2.0 metres in zone 3-653. Mineralization is hosted in a biotite-chlorite-sericite altered andesite consisting of up to 4% disseminated pyrite in a chlorite-pyrite veinlet.

OSK-OB-19-180 intersected 6.00 g/t Au over 2.0 metres. This mineralized interval does not correspond to a known zone. Mineralization is hosted in a sericite-chlorite altered quartz-phyric rhyodacite and is composed of up to 7% clustered pyrite associated with chlorite-pyrite-carbonate veinlets and 2% disseminated pyrite oriented parallel to the main fabric orientation.

OSK-OB-19-182 intersected 3.77 g/t Au over 2.0 metres in zone 3-653. This intersection is included in a larger interval grading 1% zinc over 32.3 metres with a continuous gold background content over 0.1 g/t Au up to 7.34 g/t Au. Mineralization in hosted within a sericite-silica-chlorite altered quartz-phyric rhyodacite unit with up to 2% sphalerite and 1% pyrite stringers locally cross-cutting the main fabric orientation and disseminated pyrite oriented parallel to the main fabric orientation.

OSK-OB-19-186 intersected 3.10 g/t Au over 2.0 metres in zone 3-551. Mineralization is hosted in a sericite altered aphyric rhyodacite and consists of up to 2% disseminated pyrite and 5% clustered pyrite oriented parallel to the main fabric orientation.

OSK-OB-19-191 intersected 4.55 g/t Au over 2.3 metres in zone 3-654. Mineralization is hosted within a biotite-chlorite-sericite altered andesite and consists of up to 7% disseminated pyrite associated with traces of pyrrhotite oriented parallel to the main fabric orientation.

OSK-OB-19-192 returned 35.3 g/t Au over 2.7 metres in zone 3-551.Mineralization is hosted in a sericite-chlorite altered quartz-phyric rhyodacite and consists of 6% clustered pyrite, 2% chalcopyrite, and traces of sphalerite in folded and low-angled chlorite-carbonate veinlets (1-2 cm-thick). A second interval returned 9.70 g/t Au over 3.0 metres in zone 3-653. Mineralization is hosted in a sericite and chlorite altered quartz-phyric rhyodacite unit and consists of up to 25% clustered pyrite, 5% chalcopyrite stringers, and traces of disseminated sphalerite in cm-thick chlorite veinlets (1-30mm). Veinlets are both parallel and secant to the main fabric orientation.

OSK-OB-19-194 returned 3.03 g/t Au over 2.0 metres. This mineralized interval does not correspond to a known zone. Mineralization is hosted in a sericite and chlorite altered aphyric rhyodacite unit and consists of 2% disseminated pyrite and up to 2% pyrite-chlorite stringers with traces of chalcopyrite oriented parallel to the main fabric orientation. A second interval returned 3.23 g/t Au over 3.8 metres in zone 3-552. Mineralization is hosted in a sericite-chlorite-biotite altered quartz-phyric rhyodacite unit and consists of up to 7% disseminated and clustered pyrite and traces of clustered chalcopyrite oriented parallel to the main fabric orientation. A third interval returned 3.46 g/t Au over 2.8 metres in zone 3-650. Mineralization is hosted in a sericite-chlorite-biotite altered quartz-phyric rhyodacite and consists of 2% disseminated pyrite and traces of sphalerite stringers oriented parallel to the main fabric orientation.

OSK-OB-19-196 returned 3.23 g/t Au over 2.2 metres in zone 3-552. Mineralization is hosted in a sericite and chlorite altered rhyodacite unit and consists of 10% chlorite-pyrite veinlets (1-4 cm-thick) containing approximately 75% pyrite and 1% chalcopyrite. A second interval returned 13.0 g/t Au over 2.5 metres in zone 3-552, a third interval returned 3.16 g/t Au over 3.1 metres in zone 3-552, and a fourth interval returned 3.06 g/t Au over 3.8 metres in zone 3-551.

OSK-OB-19-201 returned 8.00 g/t Au over 2.1 metres in zone 3-551. Mineralization is hosted in a sericite and silica altered quartz-phyric rhyodacite and consists of up to 1% pyrite stringers in thin smoky quartz veinlets that locally cross-cut the main fabric orientation and traces of sphalerite stringers oriented parallel to the main fabric orientation.

OSK-OB-19-204 returned 7.70 g/t Au over 2.0 metres in zone 3-552. Mineralization is hosted in a sericite and chlorite altered rhyodacite and consists of up to 5% pyrite and chalcopyrite stringers associated with folded chlorite-carbonate veinlets and 1% fine-grained disseminated pyrite oriented parallel to the main fabric orientation.

OSK-OB-19-212 returned 3.34 g/t Au over 3.5 metres in zone 3-552. Mineralization is hosted in a sericite altered and weakly bleached andesite and consists of up to 3% clustered pyrite oriented parallel to the main fabric orientation and traces of pyrite stringers that are secant to the main fabric orientation. A second interval returned 3.62 g/t Au over 7.0 metres in zone 3-552, and a third interval returned 51.5 g/t Au over 2.8 metres in zone 3-653.

OSK-OB-19-213 returned 10.7 g/t Au over 2 metres in zone 3-551. Mineralization is hosted in a biotite and silica altered andesite and consists of 2 to 3% disseminated pyrite and pyrite-chalcopyrite stringers associated with chlorite veinlets. The chlorite veinlets are locally secant to the main fabric orientation.

Qualified Person
The scientific and technical content of this news release has been reviewed, prepared and approved by Mr. Mathieu Savard, P.Geo. (OGQ 510), Vice-President of Exploration, 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 currently unknown but is estimated at 65-80% 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. All NQ core assays reported 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, Thunder Bay, Ontario, Sudbury, Ontario or Vancouver, British Columbia. 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. All samples are also analyzed for multi-elements, using an Aqua Regia-ICP-AES 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.

About the Osborne-Bell Gold Deposit
The Osborne-Bell gold deposit is located 15 kilometres northwest of the town of Lebel-sur-Quevillon in the Abitibi region of Québec, Canada. The mineral resource defined by Osisko, as disclosed in the Osborne-Bell Technical Report (as defined below), comprises 2,587,000 tonnes at 6.13 g/t Au (510,000 ounces) in the inferred mineral resource. Mineralization occurs in nine (9) individuals mineralized zones:1-551, 1-651, 1-653, 2-650, 2-652, 3-551, 3-552, 3-652, 3-653. All zones comprise sub-vertical lenses following intermediate and felsic volcanic rocks plunging to the northeast. The deposit is well defined from surface to a depth of 300 metres. For details regarding the key assumptions, parameters and methods used to estimate the mineral resources presented in respect of the Osborne-Bell gold project, please see the technical report entitled "Technical Report and Mineral Resource Estimate – Osborne-Bell deposit, Quévillon property " and dated April 23, 2018 (effective date of March 2, 2018), which has been prepared by InnovExplo Inc. from Val-d'Or, Québec (the "Osborne-Bell Technical Report"). The Osborne-Bell Technical Report is available on Osisko's website at www.osiskomining.com and on SEDAR under Osisko's issuer profile at www.sedar.com. For details regarding the PEA refer to "Preliminary Economic Assessment of the Windfall Lake Project, Lebel-sur-Quévillon, Québec, Canada” and dated August 1, 2018 (effective date of July 12, 2018), has been prepared for Osisko by BBA Inc., InnovExplo Inc., Golder Associates Ltd., WSP Canada Inc. and SNC-Lavalin Stavibel Inc. (the Windfall PEA). The Windfall PEA which includes the Osborne Bell Deposit is available on SEDAR (www.sedar.com) under Osisko’s issuer profile.

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% in the high-grade Windfall Lake 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 in the 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 discussions with respect to 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”, “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 timing and ability of Osisko to file a technical report in respect of this resource estimate; the prospects of the Osborne-Bell gold deposit; the potential for the Osborne-Bell gold deposit being a significant deposit; the potential future mill site for the Windfall Lake gold deposit; the timing and ability of Osisko, if at all, to publish a resource update for Windfall-Lynx; the projected capital expenditures of mining activities at the Osborne-Bell gold deposit; upgrading a inferred mineral resource to a measured mineral resource or indicated mineral resource categories; the significance of historic exploration activities and results. This forward-looking information is based on reasonable assumptions and estimates of management of the Corporation, at the time it was made, involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Osisko to be materially different from any future results, performance or achievements expressed or implied by such forward-looking information. 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 drilling; property interests in the Quévillon project and the Osborne-Bell 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.

For further information please contact:
John Burzynski
President and Chief Executive Officer
Telephone: (416) 363-8653