Large, High-Grade Cesium Discovery Confirmed at
Patriot Battery Metals Inc.
Suite 700 - 838 W. Hastings Street, Vancouver, BC, Canada, V6C 0A6
www.patriotbatterymetals.com TSX: PMET / ASX: PMT / OTC: PMETF / FSE: R9GA
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
April 9, 2025 – Vancouver, BC, Canada
April 10, 2025 – Sydney, Australia
HIGHLIGHTS
• 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
o 18.1 m at 2.71% Cs2O, including 7.4 m at 5.45% Cs2O (CV24-754).
o 11.1 m at 4.87% Cs2O, including 7.1 m at 7.39% Cs2O (CV24-520).
o 5.7 m at 4.97% Cs2O, including 3.0 m at 8.20% Cs2O (CV24-525).
o 9.6 m at 1.59% Cs2O, including 4.4 m at 2.34% Cs2O (CV24-579).
o 3.0 m at 9.43% Cs2O, including 1.0 m at 22.41% Cs2O (Channel CH23-069).
Rigel Zone
o 5.9 m at 11.19% Cs2O, including 1.0 m at 22.69% Cs2O (CV23-271).
o 5.0 m at 13.32% Cs2O, including 2.0 m at 22.90% Cs2O (CV23-255).
o 3.2 m at 10.24% Cs2O, including 1.1 m at 26.61% Cs2O (CV23-204).
o 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:
o 10.4 m at 1.30% Cs2O, including 4.0 m at 2.02% Cs2O (CV23-117).
o 9.0 m at 1.20% Cs2O, including 1.5 m at 5.03% Cs2O (CV24-651).
o 7.5 m at 1.29% Cs2O, including 1.5 m at 3.90% Cs2O (CV24-404).
o 2.0 m at 5.24% Cs2O (CV23-219).
o 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.
o Economically viable cesium deposits are very rare globally, but high value ,
and typically on a smaller scale of <10 kt to 350,000 kt in size and
supported by drill intercepts of typically less than 3 to 10 m. This compares
to lithium pegmatite deposits that typically range in the millions of tonnes (<10 Mt
and rarely over 100 Mt) in size and are supported by much thicker drill intercepts.
Darren L. Smith, Patriot Executive and Vice President of Exploration, comments: “With the receipt
of overlimit assay results , we have now confirmed a large cesium discovery at Shaakichiuwaanaan,
supported by wide and well-mineralized drill intercepts. Cesium mineralization of this scale and grade ,
often combined with high-grade lithium and tantalum, is exceptionally rare globally and underscores the
extraordinary endowment of the mineral system at Shaakichiuwaanaan in high-value critical minerals.
While our primary focus remains steadfast on advancing the CV5 Deposit to production based on its world-
class lithium endowment, the discovery of cesium presents a compelling value-add opportunity for the
Company. Cesium is a high-value and rare commodity which has the potential to become a meaningful by-
product to future lithium operations, complementing our core business.”
“Given the strategic importance and scarcity of cesium in global markets - and its growing use in key
industrial and specialized applications – this discovery has the potential to significantly enhance stakeholder
value and re-affirms Shaakichiuwaanaan as one of the top LCT pegmatite asset s in the world . For this
reason, the Company intends to further evaluate the cesium opportunity as we advance Shaakichiuwaanan
towards development,” added Mr. Smith.
PATRIOT BATTERY METALS INC. (THE “COMPANY” OR “PATRIOT”) (TSX:
PMET) (ASX: PMT) (OTCQX: PMETF) (FSE: R9GA) is pleased to announce the
results of cesium (Cs) assay overlimit analysis, which reaffirm the discovery of two (2) distinct
zones of cesium mineralization at the CV13 Pegmatite . The CV13 Pegmatite forms part of t he
Company’s 100% owned Shaakichiuwaanaan Property (the “Property” or “Project”), located in the
Eeyou Istchee James Bay region of Quebec.
The Shaakichiuwaanaan Property hosts a consolidated Mineral Resource Estimate 1 (“MRE”) of
80.1 Mt at 1.44% L I2O Indicated and 62.5 Mt at 1.31% L I2O Inferred. The CV5 Spodumene
Pegmatite, which forms the bulk of the MRE , is accessible year-round by all -season road and is
situated approximately 14 km from a major hydroelectric powerline corridor. The CV13 Pegmatite
is located <3 km along geological trend from the CV5 Pegmatite, and hosts additional lithium and
tantalum resources, as well as r ecently discovered zone s of cesium mineralisation (see news
release dated March 2, 2025).
CV13 PEGMATITE
The initial discovery of two (2) distinct zones of cesium enrichment at CV13 was first announced
in the Company’s news release dated March 2, 2025 , and was based on drill hole pegmatite
intercepts which had returned analytical results for c esium that exceeded the detection limit –
>10,000 ppm Cs (i.e., > 1% Cs or >1.06% Cs2O) – of the analytical package . With the overlimit
1 Shaakichiuwaanaan (CV5 & CV13) Mineral Resource Estimate (80.1 Mt at 1.44% Li 2O 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.
analytical results now received, the final grade -width calculations for the intervals >1% Cs 2O are
reported in this news release (see Figure 1, Figure 2, Figure 3, Figure 4, Table 1, and Table 3).
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 c oincident 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).
Figure 1: Drill hole analytical result highlights for cesium from the Vega and Rigel zones at the
CV13 Pegmatite.
Figure 2: Pollucite in grey quartz matrix from 139.3 m to 139.5 m in drill hole CV24-520 (Vega
Zone), within a wider zone of cesium mineralization grading 7.39% Cs2O over 7.1 m.
Figure 3: High-grade pollucite mineralization in drill hole CV23-271 (Rigel Zone) grading 22.69%
Cs2O over 1.0 m (64.0 m to 65.0 m).
Figure 4: Semi-massive to massive pollucite intercept (red box) in drill hole CV23-255 (Rigel Zone)
grading 17.95% Cs2O over 3.7 m (76.3 m to 80.0 m), including 22.90% Cs 2O over 2.0 m
(78.0 m to 80.0 m).
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).
Figure 5: Pollucite mineralization in drill hole CV23-219 (CV5) grading 5.24% Cs2O over 2.0 m
(109.5 m to 111.5 m).
Figure 6: Drill hole analytical result highlights for cesium at the CV5 Pegmatite.
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).
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
Zone Hole ID From
(m)
To
(m)
Interval
(m)
Cs2O
(%)
Li2O
(%)
Ta2O5
(ppm) Comments
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