Work Programs Commence to Unlock Tantalum as a High- Value By-Product Critical Metal Opportunity Shaakichiuwaanaan rapidly evolving into an emerging critical minerals powerhouse, with workstreams now underway on caesium, tantalum, and gallium opportunities

June 25, 2025 – Montreal, QC, Canada June 26, 2025 – Sydney, Australia

HIGHLIGHTS

• Emerging and high-growth applications of tantalum are being driven by both technological innovation and strategic shifts in global industries.
• Shaakichiuwaanaan ranks as a top-5¹ tantalum pegmatite Mineral Resource² globally in terms of both grade and tonnage:
  • Indicated: 108.0 Mt at 1.40% Li2O, 166 ppm Ta2O5, and 66 ppm Ga.
  • Inferred: 33.3 Mt at 1.33% Li2O, 156 ppm Ta2O5, and 65 ppm Ga.
• High-grade tantalum (and lithium) drill intersections include:
  • 9.6 m at 0.94% Li2O and 2,307 ppm Ta2O5 (CV23-271) – CV13
  • 9.5 m at 1.12% Li2O and 1,538 ppm Ta2O5 (CV24-441) – CV5
  • 22.7 m at 2.79% Li2O and 972 ppm Ta2O5 (CV24-661) – CV5
  • 22.9 m at 2.58% Li2O and 621 ppm Ta2O5 (CV23-181) – CV5
• Tantalite is the primary mineral host for the tantalum identified at Shaakichiuwaanaan.
• Tantalite is commercially recovered as a by-product from multiple lithium

pegmatite operations globally using simple, well-understood, and conventional methods – including Greenbushes, Pilgangoora, Wodgina, and Tanco.

• The Company has commenced evaluating options to advance and incorporate

the tantalum opportunity at Shaakichiuwaanaan as a potential by-product into the overall economic development of the Project, to follow the completion of the lithium-only Feasibility Study on the CV5 Pegmatite which remains on track for Q3 2025:

• Test programs now underway to thoroughly evaluate tantalum recovery, with ~19% Ta2O5 tantalite concentrate produced in the initial test program.

1 Determination based on Mineral Resource data, sourced through April 11, 2025, from corporate disclosure of NI 43-101, JORC, or equivalent regulatory body (see news release dated May 12, 2025).

2 Cut-off grade is variable depending on the mining method and pegmatite (0.40% Li2O open-pit, 0.60% Li2O underground CV5, and 0.70% Li2O underground CV13). The Effective Date of the MRE (announced May 2025) is January 6, 2025 (through drill hole CV24-787). Mineral Resources are not Mineral or Ore Reserves as they do not have demonstrated economic viability.

Patriot Battery Metals Inc.

Suite 900 - 1801, McGill College, Montreal, Qc, H3A 1Z4 www.patriotbatterymetals.com TSX: PMET / ASX: PMT / OTC: PMETF / FSE: R9GA Darren L. Smith, Executive Vice President Exploration, comments: “The Shaakichiuwaanaan Project is rapidly evolving into a critical minerals powerhouse with tantalum, caesium, and gallium already identified as significant potential by-product opportunities to a primary lithium operation. Of these opportunities, tantalum is the most common in the industry, when grades are sufficiently high, and may be recovered using simple and conventional processing methods with no material impact on lithium recoveries.”

“With Shaakichiuwaanaan ranking as one of the top-5 tantalum pegmatites globally in terms of grade and tonnage, there is strong potential for tantalum to further enhance the economic and financial returns of the Project,” added Mr. Smith.

PATRIOT BATTERY METALS INC. (THE “COMPANY” OR “PATRIOT”) (TSX: PMET) (ASX: PMT) (OTCQX: PMETF) (FSE: R9GA) is pleased to provide an update on work streams currently underway to unlock tantalum – another important and high-value critical and strategic metal present in abundance at its 100%-owned Shaakichiuwaanaan Property (the “Property” or “Project”), located in the Eeyou Istchee James Bay region of Quebec. The Shaakichiuwaanaan approximately 13 km south of the regional and all‑weather Trans-Taiga Road and powerline Mineral Resource³, comprised of the CV5 and CV13 Li-Cs-Ta (“LCT”) pegmatites, is situated

infrastructure corridor, and is accessible year-round by all-season road.

The Shaakichiuwaanaan LCT pegmatites are highly evolved through the process of crystal fractionation during formation, whereby mineral crystallization leads to progressive changes in the chemistry of the remaining melt, resulting in increasingly rare minerals being formed as the process unfolds. This process of LCT pegmatite formation most commonly leads to only modest enrichment of lithium and other critical metals; however, in rare circumstances may result in extreme enrichment.

The Company is very fortunate that the Shaakichiuwaanaan LCT pegmatites are highly evolved, which has resulted in the extreme enrichment of lithium, caesium, and tantalum – each at potentially world-class scale – as well as other potentially recoverable critical and strategic metals (e.g., gallium). Each of these critical metals could become further value-added byproducts to the envisioned primary lithium operation at Shaakichiuwaanaan. Additional information is provided below describing the tantalum opportunity and the steps being taken to evaluate the development of this unique asset.

TANTALUM OPPORTUNITY

Tantalum, which is primarily hosted in the mineral tantalite at Shaakichiuwaanaan, has been

commercially recovered from LCT pegmatites historically and at active mining operations today (e.g., Greenbushes, Pilgangoora, Wodgina, and Tanco). This potentially derisks the pathway to recover tantalum at Shaakichiuwaanaan.

3 Shaakichiuwaanaan (CV5 & CV13) Mineral Resource Estimate (108.0 Mt at 1.40% Li2O, 166 ppm Ta2O5 and 66 ppm Ga, Indicated, and 33.3 Mt at 1.33% Li2O, 156 ppm Ta2O5, and 65 ppm Ga, Inferred) is reported at a cut-off grade of 0.40% Li2O (open-pit), 0.60% Li2O (underground CV5), and 0.70% Li2O (underground CV13) with an Effective Date of January 6, 2025 (through drill hole CV24- 787). Mineral resources are not mineral reserves as they do not have demonstrated economic viability.

Further bolstering this potential is the ranking of the MRE at Shaakichiuwaanaan as a top-5⁴ tantalum pegmatite in the world in terms of both grade and tonnage (Figure 1), highlighting the exceptional critical metal endowment present at the Project – 108.0 Mt at 1.40% Li2O and 166 ppm Ta2O5 Indicated, and 33.3 Mt at 1.33% Li2O and 156 ppm Ta2O5 Inferred. This equates to contained tantalum content of 23,104 tonnes (50.9 million pounds) Ta2O5.

Figure 1: MRE tonnage vs grade chart highlighting Shaakichiuwaanaan as a top-5 tantalum pegmatite Mineral Resource globally. Mineral Resource data sourced through April 11, 2025, from corporate disclosure of NI 43- 101, JORC, or equivalent regulatory body. Deposit/Project data presented includes the total resource tonnage. Mineral resources are presented on a 100% basis and inclusive of reserves where applicable. Data is presented for all pegmatite deposits/projects reporting tantalum resources to the knowledge of the Company. See Appendix 2 and 3 for further details and supporting information.

As is common in LCT pegmatites, the tantalum mineralization is zoned within the wider pegmatite body and often overlaps with lithium mineralization zonation. Very high-grade tantalum zones are present within the deposit, which may overlap with high-grade lithium zones. Drill intersections include (Table 1, Table 2):

• 9.6 m at 0.94% Li2O and 2,307 ppm Ta2O5 (CV23-271) – CV13
• 9.5 m at 1.12% Li2O and 1,538 ppm Ta2O5 (CV24-441) – CV5
• 22.7 m at 2.79% Li2O and 972 ppm Ta2O5 (CV24-661) – CV5
• 22.9 m at 2.58% Li2O and 621 ppm Ta2O5 (CV23-181) – CV5

4 Determination based on Mineral Resource data, sourced through April 11, 2025, from corporate disclosure of NI 43-101, JORC, Figure 2: Very coarse-grained tantalite crystals at ~217 m depth in drill hole CV23-109 at the CV5 Pegmatite. Core grades 1,688 ppm Ta2O5 over 0.5 m (216.5 m to 217.0 m).

PROCESS RECOVERY

At historical and active lithium pegmatite mine operations (e.g., Greenbushes, Pilgangoora, Wodgina, and Tanco), tantalum is recovered into a mineral concentrate (typically tantalite) using well-understood, simple, and conventional methods. At Shaakichiuwaanaan, the tantalite is envisioned to be recovered from the lithium process waste streams using simple, conventional, and low-cost magnetic and gravity methods (e.g., spirals). It is anticipated that the tantalum recovery circuit could be positioned as a “bolt-on” to the primary lithium recovery circuit using these waste streams as feed, with no impact on the overall lithium recovery.

The Company has active testwork programs underway at SGS Canada (Lakefield, ON, facility) targeting tantalite recovery on both early open-pit and early underground mine-life material. Initial results have been very encouraging with concentrate from the first lithium waste stream tested grading ~12% to 19% Ta2O5 at good stage recovery. Testing is continuing on the remaining waste streams from the lithium process circuit, which will allow for an overall concentrate grade and recovery to be determined.

TANTALUM MARKET

Tantalum is an essential component required for a range of high-tech devices, electronics, superalloys, and essential niche applications including capacitors. Due to these essential uses, tantalum is listed as a critical and strategic mineral by the province of Quebec (Canada), Canada, European Union, United Kingdom, Australia, Japan, India, South Korea, and the United States. Tantalum is a unique, high-performance metal known for its high melting point, exceptional corrosion resistance, and ability to efficiently store and transfer electrical charge. High-growth and emerging applications of tantalum are being driven by both technological innovation and strategic shifts in global industries. Emerging industry applications include advanced electronics and 5G infrastructure, semiconductor manufacturing, medical technology including implants and medical imaging equipment, aerospace, and quantum computing.

According to the United States Geological Survey, an estimated 2,100 tonnes of tantalum was produced globally in 2024. No significant amounts of tantalum are currently produced in North America or Europe, with a majority (85%+) of production coming out of the Democratic Republic of Congo, Rwanda, Nigeria, and Brazil. However, a significant amount of global supply (~60%) comes out of certain African regions where serious conflict and corruption are present and worker conditions are secondary, thus necessitating a conflict free source of supply. Growing tantalum production from lithium pegmatites, predominantly out of Australia at this time, is seen as a source of alternative, secure, stable, and conflict-free supply to global markets.

Tantalum currently trades for ~US$239/kg ($527/lb) in its refined form (Ta2O5 ≥99.5%). Depending on the source, market growth is forecasted at 4-6% CAGR through the end the decade.

NEXT STEPS

Through the lithium-focused exploration and resource development drilling completed to date at the Property, the Company has identified other high-value critical metal potential by- products in addition to the existing large-scale lithium Mineral Resource at Shaakichiuwaanaan, namely caesium, tantalum, and gallium. The caesium opportunity was outlined in the News Release dated June 10, 2025, with the tantalum opportunity described in this news release. The current phase of tantalum recovery testwork at SGS Canada’s Lakefield, ON, facility is anticipated to be completed in the coming weeks and is focused on recovery from the lithium process waste streams. This work will allow for a preliminary understanding of process design to be developed and an estimate of the overall concentrate grade and recovery that may be expected. A follow-up program is planned that will include further assessment as a potential “bolt-on” recovery circuit to the primary lithium recovery circuit, as well as targeting optimizations of the process.

Additionally, the Company is actively engaged with potential end-users and supply chain participants to further develop the economic opportunity in the tantalum products anticipated to be derived from the Project.

The lithium-only Feasibility Study based on the CV5 Mineral Resource component of the overall Shaakichiuwaanaan MRE is on-track for completion in Q3-2025 and remains the near-term focus for the Company. The economic potential in critical metal by-products will be assessed once the lithium-only Feasibility Study is completed, with various studies concurrently underway to better evaluate the opportunities present for caesium, tantalum, and gallium specifically.

Table 1: Select high-grade tantalum intercepts at the CV5 and CV13 pegmatites.

Table 2: Attributes for drill holes discussed in this announcement.

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, Restricted Share Units (RSUs), and Performance Share Units (PSUs) 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 Resource⁵, which includes the CV5 & CV13 spodumene pegmatites, totals 108.0 Mt at 1.40% Li2O, 166 ppm Ta2O5, and 66 ppm Ga, Indicated, and 33.3 Mt at 1.33% Li2O, 156 ppm Ta2O5, and 65 ppm Ga, Inferred, and ranks⁶ as the largest lithium pegmatite resource in the Americas, and the 8^th largest lithium pegmatite resource in the world. Shaakichiuwaanaan also holds significant potential for other critical and strategic metals including caesium, tantalum, and gallium. A Preliminary Economic Assessment (“PEA”) was announced for the CV5 Pegmatite (lithium) on August 21, 2024, and highlights Shaakichiuwaanaan 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.

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.

5 Cut-off grade is variable depending on the mining method and pegmatite (0.40% Li2O open-pit, 0.60% Li2O underground CV5, and 0.70% Li2O underground CV13). The Effective Date of the MRE (announced May 2025) is January 6, 2025 (through drill hole CV24-787). Mineral Resources are not Mineral or Ore Reserves as they do not have demonstrated economic viability.

6 Determination based on Mineral Resource data, sourced through April 11, 2025, from corporate disclosure of NI 43-101, JORC, “KEN BRINSDEN”

Kenneth Brinsden, President, CEO, & Managing Director Olivier Caza-Lapointe Head, Investor Relations – North America T: +1 (514) 913-5264 E: [email protected]

APPENDIX 1 – JORC CODE 2012 TABLE 1 (ASX LISTING RULE 5.8.2)

Section 1 – Sampling Techniques and Data