Comet Lithium Expands Discovery Work at Elmer East, Confirming a Continuous Caesium Pegmatite Over More Than 200 Metres A well-developed caesium-rich LCT-type pegmatite system, with all five channels returning elevated to high concentrations of caesium, tantalum, and lithium.
Comet Lithium Expands Discovery Work at
Elmer East, Confirming a Continuous Caesium
Pegmatite Over More Than 200 Metres
A well-developed caesium-rich LCT-type pegmatite system, with all five channels returning
elevated to high concentrations of caesium, tantalum, and lithium.
ROUYN-NORANDA, QC
,
Dec. 4, 2025
/CNW/ - Comet Lithium Corporation (TSXV: CLIC) (FSE:
8QY) ("Comet Lithium" or the "Corporation") is pleased to announce results from its
October 2025
channel sampling program at the Elmer East Project in the Eeyou Istchee James Bay region of
Québec. The program identified several out crops of high-grade caesium-dominant LCT pegmatites
extending over more than 200 metres of projected strike. The five sawn channel samples collected
along the trend returned strong caesium grades along with significant tantalum, and lithium values.
Importantly, the 200 metre corridor represents only the currently exposed portion of the system.
Geological and structural mapping indicate the mineralized trend may extend beyond current
exposures, and additional parallel dykes have already been identified.
These results elevate Elmer East into a rare class of global discoveries. High-grade primary caesium
systems are uncommon, with only a handful of notable examples worldwide (Tanco, Sinclair, Bikita).
The continuity, grade, and multi-element enrichment now documented at Elmer East position Comet
Lithium at the forefront of a rapidly emerging critical-mineral opportunity.
Global Significance of the Discovery
High-grade primary cesium pegmatites are among the rarest critical-mineral systems on Earth. Only
three deposits globally: Tanco (
Canada
), Sinclair (
Australia
) and Bikita (
Zimbabwe
) have ever been
commercially mined for caesium
1
. The multi-percent Cs
O grades, accompanying Ta
O
and Rb
enrichment, and structural continuity observed at Elmer East are all characteristic of this very small
class of deposits.
These results suggest Comet Lithium may be delineating the first significant caesium-rich LCT
system ever identified in the
James Bay
region, underscoring the strategic importance of this
discovery. Given the growing demand for caesium in advanced electronics, perovskite solar,
aerospace alloys, quantum technologies, and specialized chemical applications, Elmer East
represents a potential cornerstone discovery within
Canada's
critical mineral landscape.
The exploration results disclosed herein are early-stage in nature, and additional work is required to
fully understand the extent, continuity, and significance of the mineralized system.
_________________________________
1
Only three Caesium deposits globally have ever produced
.
Program Highlights:
All five channels cut across the mineralized corridor returned high-grade caesium, with robust
Li
O, Ta
O
and Rb support.
Mineralized trend now confirmed over 200 metres, remaining open in all directions.
Multiple intervals returned > 4% Cs
O, characteristic of pollucite-bearing or pollucite-proximal
LCT systems (Figure 1).
The strength and consistency of results indicate potential for a significant caesium asset, a
category with only a handful of global peers.
Preparations advancing for a 2026 drilling program.
Detailed Channel Results
CH–1 (EE25-CH1)
2.45 m
@ 1.11% Li
O,
469 ppm Ta
O
, and 3.39% Cs
O
Including
1.0 m
@ 0.49% Li
O,
375 ppm Ta
O
, and 4.91% Cs
O
CH–2 (EE25-CH2) (open to the north and south)
3.0 m
@ 1.97% Li
O,
866 ppm Ta
O
, and 2.27% Cs
O
Including
0.5 m
@ 1.15% Li2O,
495 ppm Ta
O
, and 3.75% Cs2O
and,
Including
2.0 m
@ 2.35% Li
O, 1,045 ppm Ta
O
, and 2.06% Cs
O
CH–3 (EE25-CH3) (open to the south)
3.2 m
@ 1.20% Li
O,
520 ppm Ta
O
, and 2.45% Cs
O
Including
0.5 m
@ 1.02% Li
O,
477 ppm Ta
O
, and 4.66% Cs
O
CH–4 (EE25-CH4) (open to the north and south)
2.2 m
@ 1.22% Li
O,
1160 ppm Ta
O
, and 2.18% Cs
O
Including
0.5 m
@ 1.04% Li
O,
694 ppm Ta
O
, and 4.19% Cs
O
CH–5 (EE25-CH5) (open to the north and south)
3.0 m
@ 1.13% Li
O,
929 ppm Ta
O
, and 1.35% Cs
O
Including
1.5 m
@ 1.26% Li
O,
1,315 ppm Ta
O
, and 2.09% Cs
O
Geological Observations
The October program was the second phase following the Company's August grassroots discovery
and we have now defined:
A wide, mineralized LCT pegmatite corridor
Strong enrichment in Cs
O, Ta
O
, Rb and Li
O
Multiple internal zones with > 4% Cs
O, comparable to grades historically mined at caesium
operations
Structural continuity suggesting a large, evolving pegmatite system, open along strike and at
depth
These grades and zonation patterns are hallmarks of pollucite-rich caesium systems, known for their
rarity, strategic value, and high commodity pricing.
Comparable Global Systems
The grades reported at Elmer East, including multiple > 4% Cs
O intervals, are consistent with the
high-grade zones historically mined at the Tanco mine in
Manitoba
, the Sinclair mine in
Australia
, and
the Bikita mine in
Zimbabwe
. These deposits supplied the global caesium market for decades.
Comparisons at this early stage provide valuable context to the emerging potential of Elmer East,
particularly as caesium-rich pegmatites remain extremely rare in modern exploration.
References to deposit analogues are for geological context only and there is no certainty that the
Elmer East Project will exhibit similar grades, tonnages, mineralogy, or economic potential.
Next Steps
Final structural mapping and drillhole planning over the 3D modelled mineralized corridor
Potential additional mechanical stripping to extend exposures
Drill permit amendments and pad planning
2026 drill program to test depth, thickness, and potential additional parallel pegmatites
"In management's view, Elmer East is now clearly emerging as a leading caesium discovery, these
type of deposits are rare. The continuity we are seeing over 200 metres, combined with consistently
high grades across the channel samples, is great. Caesium-dominant LCT pegmatites are rare, and
to find one of this scale, grade and multi-element enrichment in
James Bay
is remarkable. Elmer
East is quickly becoming one of Comet's most strategic assets, and we are accelerating work to get
drills turning in 2026." commented
Vincent Metcalfe
, Chair and CEO of Comet Lithium.
Figure 1 : Elmer East – Map of Channels and Mapped and Interpreted Mineralization (CNW
Group/Comet Lithium Corporation)
Figure 2 : Elmer East – West Outcrop Channels Closeup (CNW Group/Comet Lithium Corporation)
Figure 3 : Elmer East – Map of Potassium / Rubidium Ratios (CNW Group/Comet Lithium
Corporation)
Cautionary statements
Channel sample intervals represent sample lengths and may not represent true widths. Grab
samples are selective by nature and may not be representative of mineralized zones.
QAQC
A Quality Assurance / Quality Control protocol following industry best practices was incorporated
into the sampling program.
All rock samples were collected under the supervision of Comet Lithium and Dahrouge Geological
Consulting employees. All samples were logged and photographed on site while being collected.
Samples were then bagged, and blanks and certified reference materials were inserted at regular
intervals. Groups of samples were placed in large bags, sealed with numbered tags in order to
maintain a chain-of-custody, and shipped to AGAT Laboratories in
Val d'Or
, Québec.
All assays reported were analyzed at AGAT Laboratories in
Mississauga, Ontario
for multi-element
using sodium peroxide fusion and ICP-OES/ICP-MS finishes under AGAT Laboratories code
210378. In the case of overlimit for Caesium (>10,000 ppm), assays were analyzed under package
201-179 using sodium peroxide fusion and ICP-OES finish.
Qualified Person
Vincent Cardin-Tremblay
, P. Geo (ogq #1386, PGO #3347), registered in the Provinces of Québec,
and
Ontario
is Vice President Exploration to Comet Lithium, is a qualified person
under
National
Instrument 43
101
– Standards of Disclosure for Mineral Projects.
He has reviewed the technical
contents of this news release and has approved the disclosure of the technical information contained
herein.
About Dahrouge Geological Consulting Ltd.
Dahrouge Geological Consulting Ltd. Is a global mining and mineral exploration consulting group
providing expertise in professional geological, logistical, and project management services through all
stages of the mining value chain.
Based in
Edmonton, AB
, CAN,
Montreal, QC
, CAN, and
Denver, CO
, USA, Dahrouge and its
predecessor, Halferdahl and Associates, have advised and assisted clients in identifying, exploring,
developing, and optimizing mineral projects and resources since 1971.
About Comet Lithium Corporation
Comet Lithium is a dynamic exploration company with a growing portfolio of highly prospective
assets located in Québec, including several properties in the prolific
James Bay
District. The
Company's land package includes the Liberty Property, located adjacent to Winsome Resources'
Adina lithium discovery, and the Troilus East Property, positioned next to Troilus Gold's gold-copper
project. Comet's strategy is focused on systematic exploration and unlocking the value of its diverse
property portfolio through targeted fieldwork and strategic partnerships. Comet Lithium has
29,710,953 common shares outstanding.
Forward-Looking Statements
This news release contains statements that may constitute "forward-looking information" within the
meaning of applicable Canadian securities legislation. Forward-looking information may include,
among others, statements regarding the future plans, costs, objectives or performance of Comet
Lithium, or the assumptions underlying any of the foregoing. In this news release, words such as
"may", "would", "could", "will", "likely", "believe", "expect", "anticipate", "intend", "plan", "estimate"
and similar words and the negative form thereof are used to identify forward-looking statements.
Forward-looking statements should not be read as guarantees of future performance or results, and
will not necessarily be accurate indications of whether, or the times at or by which, such future
performance will be achieved. No assurance can be given that any events anticipated by the
forward-looking information will transpire or occur, including if any planned exploration programs on
the Elmer East Property, including the planning of potential drilling in 2026 described in this press
release, will occur, the timing to conduct such exploration program and the results of such
exploration programs, and if it does so, what benefits Comet Lithium will derive from any such
exploration programs. Forward-looking information is based on information available at the time
and/or management's good-faith belief with respect to future events and are subject to known or
unknown risks, uncertainties, assumptions and other unpredictable factors, many of which are
beyond Comet Lithium's control. These risks, uncertainties and assumptions include, but are not
limited to the risks, uncertainties and assumptions described under "Financial Instruments" and "Risk
and Uncertainties" in Comet Lithium's Annual Report for the fiscal year ended
December 31, 2024
, a
copy of which is available on SEDAR+ at
www.sedarplus.ca
, and could cause actual events or
results to differ materially from those projected in any forward-looking statements. Comet Lithium
does not intend, nor does it undertake any obligation, to update or revise any forward-looking
information contained in this news release to reflect subsequent information, events or
circumstances or otherwise, except if required by applicable laws.
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in
the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of
the release.
Website:
CometLithium.com
SOURCE
Comet Lithium Corporation
View original content to download multimedia:
http://www.newswire.ca/en/releases/archive/December2025/04/c1611.html
%SEDAR: 00035962E
For further information:
For further information: Comet Lithium Corporation, Vincent Metcalfe,
Chairman and CEO, [email protected], +1.514.249.9960, 147 Québec Avenue (back
door), Rouyn-Noranda, Québec J9X 6M8
Email: [email protected]
CO: Comet Lithium Corporation
CNW 07:00e 04-DEC-25