Patriot Announces Discovery of a Large Cesium Zone at Shaakichiuwaanaan

March 2, 2025 – Vancouver, BC, Canada March 3, 2025 – Sydney, Australia

Highlights

• A review of the Company’s drill core assay dataset has identified multiple distinct areas of considerable cesium enrichment (>1% Cs2O)
• Primary zone of enrichment is coincident with the Company’s high-grade lithium Vega Zone (CV13) and can be traced in drill holes over a very large area of approximately 600 m x 400 m and remains open in several directions.
• Pollucite, the principal and preferred ore mineral for cesium, has been identified by XRD mineralogical analysis at the CV13 Pegmatite and is interpreted to be the principal source of the cesium enrichment at the Property. A more focused mineralogical program is underway.
• This extremely rare Cesium mineral has the potential to become a meaningful by-product to future lithium operations.
• Cesium results in drill hole and channel include:
  • 10.4 m at 1.30% Cs2O, including 4.0 m at 2.02% Cs2O (CV23-117) at CV5.
  • 10.6 m at >1.00% Cs2O (CV24-754) at CV13 – Cs overlimit analysis pending¹
  • 7.1 m at >1.00% Cs2O (CV24-520) at CV13 – Cs overlimit analysis pending¹
  • 0.5 m at 9.58% Cs2O (Channel CH22-047) – CV12
• Overlimit (>1% Cs) assay results for cesium are pending for more than 140 individual core samples with final grade-width calculations for drill holes to be reported once received.
• Economic deposits are typically on the scale of <10 kt to 350,000 kt in size, compared to typical lithium pegmatite deposits that range in the millions of tonnes (<10 Mt and rarely over 100 Mt) in size.
• The Company understands that there are only a handful of operators globally currently producing Cesium products, resulting in it being a highly rare and valuable commodity given it has a number of significant industrial applications.

1 Assay results exceeded the upper detection limit (10,000 ppm Cs) of the base analytical package and require subsequent overlimit analysis using a different analytical package to determine the Cs grade. Overlimit analysis is now pending to determine actual grades and will be reported once received.

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 Darren L. Smith, Patriot Executive and Vice President of Exploration, comments: “The identification of multiple zones of extensive cesium mineralization in drill hole at Shaakichiuwaanaan is very significant. Cesium pegmatite occurrences over 1% Cs2O are very rare and represent only the most fractioned and evolved portion of a pegmatite body. Although the focus for the Company is lithium pegmatite and advancing CV5 to production, there is a clear opportunity to potentially delineate a pollucite (cesium) zone of significant scale. Moreover, given the scarcity and value of cesium, there is a strong potential to further enhance stakeholder value.”

Patriot Battery Metals Inc. (the “Company” or “Patriot”) (TSX: PMET) (ASX: PMT) (OTCQX: PMETF) (FSE: R9GA) is pleased to announce the discovery of a large zone of cesium mineralization at the CV13 Pegmatite, which forms part of the Company’s wholly 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 Estimate² (“MRE”) of 80.1 Mt at 1.44% Li2O Indicated and 62.5 Mt at 1.31% Li2O 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.

With the geological and block models for the CV5 Pegmatite now handed off to the Feasibility Study team, the Company has further reviewed its core assay dataset and identified multiple distinct areas of considerable cesium (Cs) enrichment (>1% Cs). These include the CV5 and CV12 pegmatites; however, the two (2) largest zones are hosted by the CV13 Pegmatite. Cesium results in drill hole and channel (Figure 1, Table 1, and Table 2) include:

• 10.4 m at 1.30% Cs2O, including 4.0 m at 2.02% Cs2O (CV23-117) at CV5.
• 10.6 m at >1.00% Cs2O (CV24-754) at CV13 – Cs overlimits pending
• 7.1 m at >1.00% Cs2O (CV24-520) at CV13 – Cs overlimits pending
• 0.5 m at 9.58% Cs2O (Channel CH22-047) – CV12

Overlimits (>1% Cs2O) are pending for cesium for more than 140 core samples from the 2024 summer-fall drill program, including approximately 100 from the CV13 Pegmatite. Overlimits are required when the analytical result exceeds the upper detection limit of the analytical package, which in this case is >10,000 ppm Cs (i.e., 1% Cs). Final cesium grade-width calculations for drill holes CV24-520, CV24-754, as well as multiple others, will be reported once overlimit analysis for cesium are received.

Two (2) distinct areas of cesium enrichment have been identified at CV13 (Figure 1). The principal

and largest of the cesium zones is coincident with the high-grade (lithium) Vega Zone and can be traced in drill hole over an extensive area of approximately 600 m x 400 m, ranging in thickness from 1-2 m to at least 10 m (core length). The second zone is associated with

2 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 ppm 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.

the apex of the structural flexure at CV13 and is estimated through drilling to be at least ~250 m x 50 m in area and up to several metres thick.

Pollucite, the principal and preferred ore mineral for cesium, has been identified by XRD mineralogical analysis at Shaakichiuwaanaan and is interpreted to be the source of the cesium enrichment at the Property. A mineralogical program focused on areas of cesium enrichment is underway.

Figure 1: Areas of significant cesium enrichment, with approximately 100 individual core samples pending overlimit analysis (>1% Cs).

Table 1: Attributes for drill holes and channels discussed herein.

Drill Hole / From To Interval Cs2O Li2O Ta2O5 ID Pegmatite

Drill Hole CV5

(1) All intervals are core length; (2) Cesium grades >1.00% Cs2O indicate the sample analytical result exceeded the upper detection limit of the base analytical package and that overlimit analysis using a different analytical package is pending.

As a next step, the Company will use its drill and surface sampling data to geologically model the zone of cesium enrichment within the wider pegmatite body at each of the main occurrences, with the focus on the Vega Zone area of CV13. Additionally, cesium will be added to the block model to further assess the occurrences.

The identification of significant pollucite 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. As the Feasibility Study for CV5 progresses, 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

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, it 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.

Mineral deposits of cesium (pollucite) are extremely rare and represent the most fractionated component of LCT pegmatites, which are effectively the only primary source of cesium globally. Economic deposits are typically on the scale of <10 kt to 350,000 kt in size, compared to typical lithium pegmatite deposits that range in the millions of tonnes (<10 Mt and rarely over 100 Mt) in size. Examples of the few current/past producing mines include Tanco (Canada, Figure 2), Bikita (Zimbabwe), and Sinclair (Australia). Australia's first commercial cesium mine, Sinclair, extracted its last cesium in 2019.

Figure 2: Tanco Mine and chemical plant site at Bernic Lake, Manitoba, (Source: Tanco website).

Table 2: Attributes for drill holes and channel discussed herein.

Quality Assurance / Quality Control (QAQC)

A Quality Assurance / Quality Control protocol following industry best practices was incorporated into the program and included systematic insertion of quartz blanks and certified reference materials into sample batches at a rate of approximately 5% each. Additionally, analysis of pulpsplit sample duplicates was completed to assess analytical precision, and external (secondary) laboratory pulp-split duplicates were prepared at the primary lab for subsequent check analysis and validation.

All samples collected were shipped to SGS Canada’s laboratory in Val-d’Or, QC, or Radisson, QC, for sample preparation (code PRP90 special) which includes drying at 105°C, crush to 90% passing 2 mm, riffle split 250 g, and pulverize 85% passing 75 microns. The pulps were shipped by air to SGS Canada’s laboratory in Burnaby, BC, where the samples were homogenized and subsequently analyzed for multi-element (including Li, Cs, and Ta) using sodium peroxide fusion with ICP- AES/MS finish (codes GE_ICP91A50 and GE_IMS91A50).

Overlimits for cesium are requested when the analytical result exceeds the upper detection limit (10,000 ppm Cs) of the GE_ICP91A50 and GE_IMS91A50 analytical packages. The overlimit package used for cesium is GC_AAS49C – acid digestion for alkaline elements – and reports Cs in %.

Qualified/Competent Person

The information in this news release that relates to exploration results for the Shaakichiuwaanaan Property is based on, and fairly represents, information compiled by Mr. Darren L. Smith, M.Sc., P.Geo., who is a Qualified Person as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects, and member in good standing with the Ordre des Géologues du Québec (Geologist Permit number 01968), and with the Association of Professional Engineers and Geoscientists of Alberta (member number 87868). Mr. Smith has reviewed and approved the technical information in this news release.

Mr. Smith is an Executive and Vice President of Exploration for Patriot Battery Metals Inc. and holds common shares and options in the Company.

Mr. Smith has sufficient experience, which is relevant to the style of mineralization, type of deposit under consideration, and to the activities being undertaken to qualify as a Competent Person as described by the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (the JORC Code). Mr. Smith consents to the inclusion in this news release of the matters based on his information in the form and context in which it appears.

About Patriot Battery Metals Inc.

Patriot Battery Metals Inc. is a hard-rock lithium exploration company focused on advancing its district-scale 100%-owned Shaakichiuwaanaan Property (formerly known as Corvette) located in the Eeyou Istchee James Bay region of Quebec, Canada, which is accessible year-round by allseason road and is proximal to regional powerline infrastructure. The Shaakichiuwaanaan Mineral Resource¹, which includes the CV5 & CV13 spodumene pegmatites, totals 80.1 Mt at 1.44% Li2O Indicated, and 62.5 Mt at 1.31% Li2O Inferred, and ranks as the largest lithium pegmatite resource in the Americas, and the 8^th largest lithium pegmatite resource in the world.

A Preliminary Economic Assessment (“PEA”) was announced for the CV5 Pegmatite August 21, 2024, and highlights it as a potential North American lithium raw materials powerhouse. The PEA outlines the potential for a competitive and globally significant high-grade lithium project targeting up to ~800 ktpa spodumene concentrate using a simple Dense Media Separation (“DMS”) only process flowsheet.

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 ppm 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.

For further information, please contact us at [email protected] or by calling +1 (604) 279-8709, or visit www.patriotbatterymetals.com. Please also refer to the Company’s continuous disclosure filings, available under its profile at www.sedarplus.ca and www.asx.com.au, for available exploration data.

This news release has been approved by the Board of Directors.

“KEN BRINSDEN”

Kenneth Brinsden, President, CEO, & Managing Director

Olivier Caza-Lapointe Head, Investor Relations – North America T: +1 (514) 913-5264 E: [email protected]

Disclaimer for Forward-looking Information

This news release contains “forward-looking information” or “forward-looking statements” within the meaning of applicable securities laws and other statements that are not historical facts. Forward-looking statements are included to provide information about management’s current expectations and plans that allow investors and others to have a better understanding of the Company’s business plans and financial performance and condition.

All statements, other than statements of historical facts included in this news release, regarding the Company’s strategy, future operations, technical assessments, prospects, plans and objectives of management are forward-looking statements that involve risks and uncertainties. Forwardlooking statements are typically identified by words such as “underway”, “potential”, “to become”, “future”, “to be”, “focus”, “opportunity”, “advancing to production”, “further enhance”, “will”, “next step” and similar words or expressions. Forward-looking statements in this release include, but are not limited to, statements on the Feasibility Study and the potential of cesium at Shaakichiuwaanaan as a marketable by-product.

Forward-looking information is based upon certain assumptions and other important factors that, if untrue, could cause the actual results, performance or achievements of the Company to be materially different from future results, performance or achievements expressed or implied by such information or statements. There can be no assurance that such information or statements will prove to be accurate. Key assumptions upon which the Company’s forward-looking information is based include, without limitation, that proposed exploration and mineral resource estimate work on the Property will continue as expected, the accuracy of reserve and resource estimates, the classification of resources between inferred and the assumptions on which the reserve and resource estimates are based, long-term demand for spodumene supply, and that exploration and development results continue to support management’s current plans for Property development and expectations for the Project.

Readers are cautioned that the foregoing list is not exhaustive of all factors and assumptions which may have been used. Forward-looking statements are also subject to risks and uncertainties facing the Company’s business, any of which could have a material adverse effect on the Company’s business, financial condition, results of operations and growth prospects. Some of the risks the Company faces and the uncertainties that could cause actual results to differ materially from those expressed in the forward-looking statements include, among others, the ability to execute on plans relating to the Company’s Project, including the timing thereof. In addition, readers are directed to carefully review the detailed risk discussion in the Company’s most recent Annual Information Form filed on SEDAR+, which discussion is incorporated by reference in this news release, for a fuller understanding of the risks and uncertainties that affect the Company’s business and operations.

Although the Company believes its expectations are based upon reasonable assumptions and has attempted to identify important factors that could cause actual actions, events or results to differ materially from those described in forward-looking statements, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that forward-looking information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such information. As such, these risks are not exhaustive; however, they should be considered carefully. If any of these risks or uncertainties materialize, actual results may vary materially from those anticipated in the forward-looking statements found herein. Due to the risks, uncertainties and assumptions inherent in forwardlooking statements, readers should not place undue reliance on forward-looking statements. Forward-looking statements contained herein are presented for the purpose of assisting investors in understanding the Company’s business plans, financial performance and condition and may not be appropriate for other purposes.

The forward-looking statements contained herein are made only as of the date hereof. The Company disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except to the extent required by applicable law. The Company qualifies all of its forward-looking statements by these cautionary statements.

Competent Person Statement (ASX Listing Rule)

The mineral resource estimate in this release was reported by the Company in accordance with ASX Listing Rule 5.8 on August 5, 2024. The Company confirms that, as of the date of this announcement, it is not aware of any new information or data verified by the competent person that materially affects the information included in the announcement and that all material assumptions and technical parameters underpinning the estimates in the announcement continue to apply and have not materially changed. The Company confirms that, as at the date of this announcement, the form and context in which the competent person’s findings are presented have not been materially modified from the original market announcement.

The production target referred to in this release was reported by the Company in accordance with ASX Listing Rule 5.16 on August 21, 2024. The Company confirms that, as of the date of this announcement, all material assumptions and technical parameters underpinning the production target in the original announcement continue to apply and have not materially changed.

Appendix 1 – JORC Code 2012 Table 1 (ASX Listing Rule 5.7.1)

Section 1 – Sampling Techniques and Data