Large, High-Grade Cesium Discovery Confirmed at Shaakichiuwaanaan, Canada

Potentially adding a further critical mineral and valuable by-product to a world-class lithium project

VANCOUVER, BC, April 9, 2025 /PRNewswire/ – April 10, 2025 – Sydney, Australia

Highlights

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Figure 6: Drill hole analytical result highlights for cesium at the CV5 Pegmatite. (CNW Group/Patriot Battery Metals Inc.)


Figure 7: Pollucite mineralization in drill hole CV24-651 (CV5) grading 5.03% Cs2O over 1.5 m (61.0 m to 62.5 m). (CNW Group/Patriot Battery Metals Inc.)

Wide, high-grade cesium pegmatite drill intercepts identified at the CV13 Pegmatite from assay overlimit analysis, including four (4) samples >20% Cs2O. Results include:
Vega Zone

18.1 m at 2.71% Cs2O, including 7.4 m at 5.45% Cs2O (CV24-754).
11.1 m at 4.87% Cs2O, including 7.1 m at 7.39% Cs2O (CV24-520).
5.7 m at 4.97% Cs2O, including 3.0 m at 8.20% Cs2O (CV24-525).
9.6 m at 1.59% Cs2O, including 4.4 m at 2.34% Cs2O (CV24-579).
3.0 m at 9.43% Cs2O, including 1.0 m at 22.41% Cs2O (Channel CH23-069).
Rigel Zone
5.9 m at 11.19% Cs2O, including 1.0 m at 22.69% Cs2O (CV23-271).
5.0 m at 13.32% Cs2O, including 2.0 m at 22.90% Cs2O (CV23-255).
3.2 m at 10.24% Cs2O, including 1.1 m at 26.61% Cs2O (CV23-204).
4.5 m at 3.36% Cs2O (CV23-198).

 The largest zone of cesium enrichment is coincident with the Company’s high-grade lithium Vega Zone (CV13) and can be traced through drilling over a very large area of ~600 m x 400 m ranging from 1-2 m to >10 m thick and remains open.
The high-grade Rigel Zone, coincident with the apex of the structural flexure at CV13, is estimated through drilling to be at least ~200 m x 80 m in area and up to ~5 m thick.
Mineralized cesium intercepts at the CV5 Pegmatite include:

10.4 m at 1.30% Cs2O, including 4.0 m at 2.02% Cs2O (CV23-117).
9.0 m at 1.20% Cs2O, including 1.5 m at 5.03% Cs2O (CV24-651).
7.5 m at 1.29% Cs2O, including 1.5 m at 3.90% Cs2O (CV24-404).
2.0 m at 5.24% Cs2O (CV23-219).
0.8 m at 13.04% Cs2O (CV24-627).

Results are highly encouraging as cesium is a high-value commodity due to its rarity and specialized applications.

Economically viable cesium deposits are very rare globally, but high value, and typically on a smaller scale of 10,000 ppm Cs (i.e., >1% Cs or >1.06% Cs2O) – of the analytical package. With the overlimit analytical results now received, the final grade-width calculations for the intervals >1% Cs2O are reported in this news release (see Figure 1, Figure 2, Figure 3, Figure 4, Table 1, and Table 3).

______________________________

1 Shaakichiuwaanaan (CV5 & CV13) Mineral Resource Estimate (80.1 Mt at 1.44% Li2O and 163 ppm Ta2O5 Indicated, and 62.5 Mt at 1.31% Li2O and 147 ppm Ta2O5 Inferred) is reported at a cut-off grade of 0.40% Li2O (open-pit), 0.60% Li2O (underground CV5), and 0.80% Li2O (underground CV13) with an Effective Date of August 21, 2024 (through drill hole CV24-526). Mineral Resources are not Mineral Reserves as they do not have demonstrated economic viability.

Significant results at CV13 include:

Vega Zone

18.1 m at 2.71% Cs2O, including 7.4 m at 5.45% Cs2O (CV24-754).
11.1 m at 4.87% Cs2O, including 7.1 m at 7.39% Cs2O (CV24-520).
5.7 m at 4.97% Cs2O, including 3.0 m at 8.20% Cs2O (CV24-525).
9.6 m at 1.59% Cs2O, including 4.4 m at 2.34% Cs2O (CV24-579).
3.0 m at 9.43% Cs2O, including 1.0 m at 22.41% Cs2O (Channel CH23-069).

The largest of the two (2) cesium zones at CV13 is coincident with the high-grade (lithium) Vega Zone (Figure 1) and can be traced through drilling over an extensive area of ~600 m x 400 m, ranging in thickness from 1-2 m to >10 m. The cesium mineralization at the Vega Zone sits ~125 m to 150 m from surface and remains open to the northwest. Additionally, the cesium zone at Vega is commonly accompanied by high-grade lithium and tantalum (Table 1).

Rigel Zone

5.9 m at 11.19% Cs2O, including 1.0 m at 22.69% Cs2O (CV23-271).
5.0 m at 13.32% Cs2O, including 2.0 m at 22.90% Cs2O (CV23-255).
3.2 m at 10.24% Cs2O, including 1.1 m at 26.61% Cs2O (CV23-204).
4.5 m at 3.36% Cs2O (CV23-198).

The newly named “Rigel Zone” is situated coincident with the apex of the structural flexure at CV13 and is estimated through drilling to have a high-grade footprint of approximately 200 m x 80 m at up to ~5 m thick. This zone includes the highest cesium grades reported to date from the Property – 1.1 m at 26.61% Cs2O (CV23-204) and 2.0 m at 22.90% Cs2O (CV23-255) – which imply intervals of near-massive pollucite and represent some of the highest known cesium grades reported globally in recent years.

The Rigel Zone is present at shallow depth (~50 m from surface) and, while it appears to be smaller in scale than the Vega Zone, it also appears to be higher grade. Additionally, similar to Vega, the cesium zone at Rigel may be accompanied by high-grade lithium and tantalum (Table 1).

CV5 Pegmatite

In addition to CV13, the CV5 Pegmatite also returned multiple cesium mineralized intercepts (see Figure 5, Figure 6, Figure 7, Table 2, and Table 3). Initial review indicates a wider distribution of cesium across the pegmatite, with distinct zones less apparent compared to the Vega and Rigel cesium zones at the CV13 Pegmatite. However, given the density of drilling, further review and modelling is required to determine continuity and distinct zonation, especially given that cesium zones are relatively small but very high-value. Drill intercept highlights for cesium at CV5 include:

10.4 m at 1.30% Cs2O, including 4.0 m at 2.02% Cs2O (CV23-117).
9.0 m at 1.20% Cs2O, including 1.5 m at 5.03% Cs2O (CV24-651).
7.5 m at 1.29% Cs2O, including 1.5 m at 3.90% Cs2O (CV24-404).
2.0 m at 5.24% Cs2O (CV23-219).
0.8 m at 13.04% Cs2O (CV24-627).

Table 1: Cesium assay summary for drill holes at the CV13 Pegmatite (Vega and Rigel Zones).

Zone

Hole ID

From
(m)

To
(m)

Interval
(m)

Cs2O
(%)

Li2O
(%)

Ta2O5
(ppm)

Comments

Vega

CV23-332

57.8

58.4

0.6

1.07

0.75

89

Vega

CV23-348

68.6

69.8

1.1

2.74

0.18

123

Vega

CV24-470

131.5

132.9

1.4

3.57

3.12

100

140.1

141.5

1.4

3.16

1.58

54

143.5

144.9

1.4

2.19

4.82

274

Vega

CV24-492

68.4

69.2

0.8

6.68

0.47

82

Vega

CV24-498

140.1

141.5

1.5

1.51

1.08

484

147.3

150.0

2.7

4.00

1.67

109

Vega

CV24-507

110.8

116.5

5.7

0.98

1.34

171

incl.

110.8

112.0

1.2

3.03

0.81

328

123.4

128.0

4.6

4.57

2.11

87

152.8

155.1

2.3

1.33

3.41

101

Vega

CV24-508

102.3

104.1

1.8

0.86

1.39

276

incl.

102.3

103.4

1.1

1.05

1.77

28

Vega

CV24-510

154.9

160.3

5.5

2.02

1.46

66

172.0

174.0

2.0

1.51

5.72

133

176.9

178.3

1.5

1.30

5.58

281

204.3

205.7

1.3

6.20

0.93

204

Vega

CV24-513

10.3

11.7

1.5

4.47

0.13

324

Vega

CV24-519

93.1

94.1

1.1

1.65

0.32

167

Some potential lepidolite

Vega

CV24-520

130.0

132.3

2.4

1.73

1.46

117

137.5

148.7

11.1

4.87

2.09

1,116

incl.

137.5

144.6

7.1

7.39

0.96

103

167.6

168.2

0.6

1.49

0.03

388

Vega

CV24-524

144.0

147.5

3.5

1.49

3.61

538

150.6

153.0

2.4

0.98

2.68

533

Vega

CV24-525

98.8

100.5

1.7

5.30

1.45

50

105.5

111.2

5.7

4.97

0.99

61

incl.

105.5

108.5

3.0

8.20

1.16

30

118.0

122.5

4.5

2.50

0.96

121

Vega

CV24-529

128.0

129.5

1.5

1.63

0.75

292

Vega

CV24-539

45.8

47.7

2.0

1.82

0.92

285

Vega

CV24-546

142.4

143.8

1.4

2.13

0.30

217

Vega

CV24-571

155.8

158.8

3.0

2.13

1.49

463

Vega

CV24-579

133.3

142.9

9.6

1.59

2.08

371

incl.

138.5

142.9

4.4

2.34

3.55

354

Vega

CV24-582

136.9

138.5

1.6

1.91

0.12

54

144.7

149.2

4.5

1.53

0.61

1,054

Some lepidolite (~5-10%)

Vega

CV24-747

205.5

206.8

1.3

2.41

4.58

189

211.5

212.9

1.4

3.54

3.13

303

Vega

CV24-754

142.5

160.5

18.1

2.71

1.89

288

incl.

142.5

149.9

7.4

5.45

1.00

286

Vega

CV24-757

251.9

258.5

6.6

0.87

3.80

148

Vega

CV24-761

124.5

129.0

4.5

4.11

1.36

166

incl.

126.6

127.5

0.8

12.30

1.74

201

137.0

138.5

1.5

1.69

2.51

187

Vega

CV24-771

79.7

80.8

1.2

3.80

0.27

239

Vega

CV24-773

144.5

147.1

2.6

2.52

0.12

9

154.6

159.0

4.4

1.32

2.30

476

163.6

165.3

1.7

2.14

3.29

188

Vega

CH23-069

2.3

5.3

3.0

9.43

2.80

148

Channel

incl.

3.3

4.3

1.0

22.41

1.63

29

CV24-446

74.6

76.1

1.5

3.82

0.70

1,258

Adjacent Vega Zone

CV24-538

189.8

190.3

0.5

1.98

0.02

243

Adjacent Vega Zone

CV24-545

202.5

203.2

0.7

2.57

0.01

248

Adjacent Vega Zone

CV24-561

397.8

398.3

0.5

1.41

2.19

215

Adjacent Vega Zone

417.7

418.6

0.8

1.28

0.14

281

Rigel

CV22-084

4.8

5.7

0.9

3.77

0.06

195

Rigel

CV23-191

78.0

79.1

1.1

1.67

4.64

54

Rigel

CV23-198

58.5

63.0

4.5

3.36

4.19

333

Some lepidolite (~25-30%)

Rigel

CV23-204

50.9

54.0

3.2

10.24

2.89

814

Some lepidolite (up to ~40%)

incl.

50.9

52.0

1.1

26.61

0.23

1

No lepidolite

Rigel

CV23-213

65.3

66.4

1.1

2.86

2.19

77

Rigel

CV23-218

78.8

79.5

0.8

1.48

1.77

8

Rigel

CV23-224

137.3

138.5

1.2

3.90

0.27

133

Rigel

CV23-255

75.0

80.0

5.0

13.32

0.24

1

incl.

78.0

80.0

2.0

22.90

0.44

1

Rigel

CV23-271

61.5

67.4

5.9

11.19

1.07

3,261

Some lepidolite (~10-15%)

incl.

64.0

65.0

1.0

22.69

0.48

110

Rigel

CV24-432

83.7

85.6

1.9

1.88

0.56

149

Rigel

CV24-436

38.1

39.6

1.6

4.46

2.78

113

Rigel

CV24-444

28.0

29.5

1.5

6.95

0.33

12

31.5

32.9

1.4

1.35

2.77

59

CV23-312

104.0

105.0

1.0

1.34

3.82

94

North-west of Rigel Zone

 (1) All intervals are core length and presented for all pegmatite intervals >1 m and >1% Cs2O. (2) Lepidolite may occur with pollucite, although typically in minor amounts, and may contain some cesium in its structure through element substitution; however, it would be significantly less than pollucite. A mineralogy program is underway to more definitively confirm Cs deportment where lepidolite has been logged.

Table 2: Cesium assay summary for drill holes at the CV5 Pegmatite.

Hole ID

From
(m)

To
(m)

Interval
(m)

Cs2O
(%)

Li2O
(%)

Ta2O5
(ppm)

Comments

CV22-030

182.0

184.0

2.0

1.03

1.61

114

CV22-036

236.3

237.1

0.8

1.92

1.35

61

CV22-042

208.4

209.4

1.0

1.58

0.37

42

255.5

257.5

2.0

1.69

4.66

154

Some lepidolite (~5%)

CV22-059

90.0

91.0

1.0

3.86

0.24

60

CV22-064

161.5

162.5

1.0

1.30

2.61

123

193.5

194.5

1.0

1.17

3.41

186

CV22-065

35.0

36.0

1.0

2.27

0.19

79

CV22-068

22.0

23.0

1.0

1.56

0.39

217

CV22-070

169.0

170.0

1.0

1.18

2.50

44

176.3

177.3

1.0

1.10

0.30

190

181.3

182.3

1.0

1.00

3.16

120

CV22-072

165.0

166.0

1.0

1.13

1.73

549

CV22-075

130.0

131.0

1.0

3.11

1.00

96

CV22-083

268.0

270.0

2.0

1.06

4.87

205

CV23-107

310.0

312.0

2.0

1.01

5.54

564

325.0

326.1

1.1

1.11

2.95

190

CV23-117

190.0

200.3

10.4

1.30

1.77

240

incl.

192.0

196.0

4.0

2.02

2.06

341

CV23-121

267.0

267.8

0.8

4.32

4.62

70

273.2

274.8

1.6

1.05

4.08

160

CV23-132

192.0

193.0

1.0

5.59

2.90

51

195.7

196.7

1.0

1.00

3.55

149

248.5

249.3

0.8

1.02

4.68

514

CV23-160A

89.8

90.7

0.9

1.01

4.48

84

198.1

199.2

1.0

2.04

1.93

109

CV23-165

430.4

431.2

0.8

1.04

1.22

292

CV23-172

330.9

332.9

2.0

2.24

1.69

300

incl.

330.9

331.6

0.7

5.31

0.59

136

CV23-176

167.0

168.2

1.1

1.24

5.17

138

CV23-177

241.5

242.5

1.0

1.67

1.78

326

CV23-181

225.0

226.0

1.0

1.22

3.25

819

264.5

266.5

2.0

0.90

4.80

278

incl.

265.5

266.5

1.0

1.21

5.39

286

278.5

279.3

0.8

1.23

3.09

900

297.5

298.5

1.0

3.46

0.25

247

CV23-182

158.4

159.4

1.0

1.71

0.40

173

CV23-184

207.8

209.9

2.1

2.23

2.73

170

incl.

207.8

208.8

1.0

3.93

3.05

173

212.0

213.0

1.0

2.96

2.52

145

216.0

217.0

1.1

0.98

1.81

62

CV23-185

100.8

101.8

1.0

1.02

3.09

193

CV23-190

105.0

106.0

1.0

1.46

2.09

433

CV23-201

265.3

268.2

2.9

4.11

0.89

333

Some lepidolite (~5%)

CV23-205

88.1

88.9

0.8

4.10

1.97

25

CV23-208

199.0

201.0

2.1

3.88

3.69

193

208.7

209.9

1.3

1.36

4.39

80

213.2

215.3

2.1

1.18

2.28

110

CV23-211

244.8

246.8

2.0

0.76

3.93

188

incl.

244.8

245.8

1.0

1.01

3.41

241

CV23-219

109.5

111.5

2.0

5.24

3.50

187

194.6

195.6

1.0

1.57

2.11

73

CV23-223

285.0

287.1

2.1

1.17

4.12

231

CV23-241

166.2

169.2

2.9

0.88

2.89

426

Some potential lepidolite

186.2

187.1

0.9

2.36

3.21

263

CV23-272A

115.5

117.2

1.7

3.96

3.30

1097

348.8

349.8

1.0

1.12

0.77

138

CV23-285

360.2

361.5

1.3

1.03

4.24

107

CV23-298

88.6

90.8

2.2

1.43

2.97

121

CV23-331

77.9

79.9

2.0

1.08

2.57

150

CV23-364

264.1

265.0

0.9

3.32

0.67

390

268.1

269.3

1.3

1.91

3.12

492

CV24-373

119.6

124.2

4.6

0.90

0.75

460

incl.

121.4

124.2

2.8

1.22

0.59

668

CV24-374

243.6

245.2

1.6

1.10

1.29

532

259.5

261.0

1.5

0.97

3.49

70

CV24-386

496.0

497.4

1.4

1.07

2.12

60

CV24-401A

326.5

327.8

1.3

1.04

4.16

111

CV24-404

276.5

284.0

7.5

1.29

3.85

200

incl.

277.5

279.0

1.5

3.90

3.93

143

CV24-414

333.5

339.3

5.9

1.26

2.40

590

incl.

336.5

338.0

1.5

3.29

1.35

346

CV24-424

154.5

156.1

1.6

1.16

1.77

446

Some lepidolite (~5-10%)

CV24-441

167.7

169.2

1.6

1.78

2.78

85

CV24-479

231.2

232.1

0.9

1.37

2.87

753

Some lepidolite (~5%)

CV24-502

271.3

272.6

1.3

1.02

2.59

283

CV24-503

402.7

406.4

3.6

1.89

0.64

141

CV24-517

297.6

298.9

1.3

1.40

0.12

222

301.3

302.8

1.5

2.42

0.28

58

CV24-586

133.4

135.4

2.0

0.89

4.25

120

CV24-607

198.8

200.0

1.2

1.72

0.40

131

CV24-613

182.4

183.7

1.3

1.29

0.33

337

CV24-616

276.6

281.0

4.4

1.18

1.80

181

CV24-627

166.1

166.9

0.8

13.04

1.79

205

CV24-636

373.5

375.1

1.6

1.61

0.78

164

CV24-639

92.7

94.0

1.3

1.39

0.90

871

CV24-651

59.5

68.5

9.0

1.20

2.02

194

incl.

61.0

62.5

1.5

5.03

2.22

219

82.5

84.0

1.5

0.99

2.28

137

91.1

94.2

3.1

0.85

2.64

117

CV24-695

234.4

237.0

2.6

1.59

0.89

183

CV24-714

332.5

334.0

1.5

1.70

3.31

90

CV24-739

94.0

95.5

1.5

1.37

1.84

52

CV24-742

429.2

434.7

5.6

0.73

5.86

229

incl.

430.7

432.4

1.7

1.27

5.67

453

 (1) All intervals are core length and presented for all pegmatite intervals >1 m and >1% Cs2O. (2) Lepidolite may occur with pollucite, although typically in minor amounts, and may contain some cesium in its structure through element substitution; however, it would be significantly less than pollucite. A mineralogy program is underway to more definitively confirm Cs deportment where lepidolite has been logged.

MINERALOGY AND GEOLOGICAL MODELLING

Pollucite, the principal and preferred ore mineral for cesium, has been identified by XRD mineralogical analysis at Shaakichiuwaanaan and is interpreted to be the primary source of the cesium enrichment at the Property based on cesium grades and logging. The high-grade cesium intercepts indicate that semi-massive to massive pollucite is present, especially in the Rigel Zone where several 10% to 20+% Cs2O intercepts are present. A mineralogical program focused on the Vega and Rigel cesium zones is underway to confirm the presence and quantitative abundance of pollucite, and to a lesser extent lepidolite where present.

With the overlimit assays for cesium now received, the Company is actively geologically modelling the Vega and Rigel cesium zones, both within the wider pegmatite geological model. Additionally, cesium will be added to the block model to further assess the potential of each zone.

In the same way that the Company’s tantalum resource has the potential to be a valuable by-product, the identification of significant cesium mineralization at CV13 presents an opportunity to further evaluate the potential of cesium as a marketable by-product, which could complement the Company’s lithium-focused development strategy and add to the suite of critical minerals that could be produced at Shaakichiuwaanaan. As the Feasibility Study for CV5 progresses for its lithium operation, the Company will assess the potential for a cesium resource at Shaakichiuwaanaan and its implications for future exploration and development.

ABOUT CESIUM – EXTREMELY RARE CRITICAL METAL

Cesium (Cs) is a specialty metal and is listed as a critical and strategic mineral by Canada, the province of Quebec (Canada), Japan, and the United States. The principal use of cesium, which is almost exclusively recovered (in its primary form) from the mineral pollucite, is in the form of cesium formate brine. Due to its high-density, low toxicity, biodegradable nature, and recoverability, cesium is used to support the completion of oil and gas wells at high pressure and temperature.

Cesium is also used in atomic clocks, GPS, aircraft guidance, and telecommunications. Its compounds have various applications: cesium carbonate in fuel cells, cesium chloride in chemistry and nuclear medicine, cesium hydroxide in batteries, cesium iodide in X-ray equipment, cesium nitrate in pyrotechnics and scintillation counters, and cesium sulfates in water treatment and scientific instruments. Cesium pricing varies based on its end-product form and purity; however, in its refined form, cesium metal (Cs >99.5%) is a high value commodity similar to gold and currently trades around US$2,550/oz (excluding VAT, Source – Shanghai Metal Markets).   

Mineral deposits of cesium (pollucite) are extremely rare globally and represent the most fractionated component of LCT pegmatite systems, which are effectively the only primary source of cesium globally. Economic deposits of cesium are typically on the scale of