21 May 2026

Bradda Head Lithium Ltd

Bradda Head Enhances Lithium Targeting at San Domingo Using SRK's Advanced Geochemical PEG Tool

("Bradda", "BHL" or the "Company")

Bradda Head Lithium Ltd. (AIM: BHLL), the North America-focused lithium development group, is pleased to announce positive results from ongoing technical studies completed by SRK Consulting (UK) Limited ("SRK") at the Company's wholly owned San Domingo lithium pegmatite project in Arizona. The work forms part of the Company's broader strategy to enhance exploration targeting, mineralogical understanding, and future metallurgical planning across its pegmatite portfolio. The work undertaken by SRK utilizes the historic exploration work undertaken by the Company and should be read in the context of previous updates on San Domingo. The resultant output generates more definitive targets for future campaigns

Summary of PEG ("Pegmatite Evaluation from Geochemistry") tool results are as follows:  

·   PEG workflow identified multiple high-priority lithium targets consistent with the Company's prior analysis, including Dragon, Midnight Owl, and Ruby Soho, supporting Bradda Head's next-phase drill targeting strategy;

·    Advanced geochemical vectoring expected to significantly enhance exploration efficiency, and prioritize the most fertile spodumene-bearing pegmatites across the San Domingo district;

·    SRK's PEG methodology confirms San Domingo as a highly evolved and fertile LCT pegmatite system, with additional upside potential from cesium, tantalum, and tin enrichment;

·    The integration of PEG analysis with drilling and surface mapping is improving geological confidence, supporting future resource growth potential and long-term project development;

·   Midnight Owl and Dragon continue to emerge as standout lithium targets, demonstrating favorable spodumene preservation, strong fractionation signatures, and encouraging drill-supported mineralization;

·    The PEG tool provides Bradda Head with a scalable exploration framework that can be expanded across its broader Arizona pegmatite portfolio, including the Whistlejacket Project;

·  SRK's interpretation supports the presence of preserved primary spodumene mineralization, a key indicator for future resource potential and metallurgical optimization; and

·  The study reinforces Bradda Head's strategy of advancing high-quality domestic U.S. lithium assets positioned to support future battery supply chain demand.

Ian Stalker, Executive Chair, commented:

"The PEG analysis completed by SRK Exploration at the San Domingo project is providing valuable insight into the fertility, mineralogical evolution, and exploration potential of our Arizona pegmatite portfolio. The identification of high-priority targets such as Dragon, Midnight Owl, and Ruby Soho demonstrates the effectiveness of integrating advanced geochemical vectoring tools with drilling, mapping, and surface geochemistry. Importantly, the PEG workflow is helping refine our understanding of spodumene-bearing systems and supports the prioritization of targets with the strongest potential for future resource growth and metallurgical optimization.

Bradda Head will continue to investigate and utilize modern technologies, including AI, to ensure Bradda Head remains at the forefront of most appropriate technological advances in drilling, enabling the Company to advance its exploration programs more efficiently across its portfolio including the recently acquired Whistlejacket project.  

We look forward to providing further updates in due course."

Detail of PEG work at San Domingo

At the request of the Company, SRK has applied its proprietary PEG workflow to evaluate pegmatites across the project using whole-rock assay data derived from both rock-chip sampling and drill core assays. The PEG workflow integrates mineralogical and geochemical interpretation to classify pegmatite types, identify mineralogical trends, and evaluate the fertility and crystallization evolution of lithium-bearing pegmatite systems.

The workflow assists in distinguishing spodumene-dominant lithium mineralization from more evolved lithium-mica-rich assemblages, while identifying potential byproduct opportunities associated with cesium, tantalum, and tin mineralization. In parallel, the study can highlight potential metallurgical penalty elements such as iron and sulfur that may influence future processing considerations. In addition, PEG analysis includes the Chemical Index of Alteration ("CIA"), a geochemical parameter utilized to assess the degree of weathering and alteration affecting pegmatites and lithium minerals, particularly spodumene.

According to SRK's interpretation, the Dragon Prospect represents one of the most prospective target areas within the San Domingo pegmatite field (Figure 1). The area displays strong geochemical fractionation together with spodumene-bearing pegmatites and spodumene-quartz mineral assemblages, characteristics considered favorable indicators of lithium fertility within LCT pegmatite systems, this is further supported by field interpretations, where well-preserve spodumene crystals have been identified in surface, and no significant hydrothermal alteration has been documented in the area. The study further suggests that the Dragon area may preserve residual primary spodumene mineralization linked to the principal magmatic lithium enrichment stage, supporting its potential as a future drill target.

The PEG analysis also identified the Midnight Owl area as one of the strongest drill-supported lithium domains within the project (Figure 1). Existing drilling and geochemical interpretation indicate spodumene-bearing pegmatites with encouraging lithium enrichment, supported by favorable mineralogical signatures and locally elevated cesium and tantalum values. SRK highlighted drill hole SD-DH22-024 as one of the best mineralized drill locations evaluated through the PEG workflow (Figure 2), demonstrating spodumene development and evidence of preserved lithium mineralization at depth, the mineralogical analysis of the drill hole shows the distribution of the mineralized intervals (Figure 3), where logged sections contain well-preserved crystalline spodumene specimens, and locally lepidolite mineralization.

While the Ruby Soho area appears less evolved than Dragon and Midnight Owl, the PEG interpretation suggests it remains sufficiently prospective to justify a maiden drilling program in future exploration campaigns. The Ruby Soho target, located approximately 1.5 km east of Midnight Owl (see PR 10/01/2024), has emerged as another priority area after surface mapping identified a pegmatite ranging from 1.5 to 5.0 meters in width and exposed over a strike length exceeding 250 meters, containing abundant visible spodumene mineralization.

Overall, the PEG study demonstrates that the San Domingo system hosts a broad spectrum of pegmatite evolution, ranging from barren and weakly fractionated pegmatites to highly evolved lithium-bearing systems. Importantly, the highest-priority targets appear associated with pegmatites that remain within the optimal spodumene crystallization stage, prior to significant hydrothermal overprinting and lithium remobilization into lithium-mica assemblages.

The study also identified localized cesium and tantalum enrichment across portions of the pegmatite field, supporting the interpretation that San Domingo represents a highly evolved and fertile LCT pegmatite system with potential byproduct upside. In addition, the PEG workflow provides a framework for future vectoring toward higher-grade lithium zones through integrated geochemical, mineralogical, and structural interpretation. According to SRK, the methodology may also support future 3D geological modeling, resource domaining, and metallurgical optimization studies as additional drilling and analytical data become available.

The three areas highlighted by the PEG workflow have the highest exploration potential on the property and currently have BLM approved exploration drilling permits (NOI's: notice of intent) and are incorporated into the Company's planned drilling programs aimed at advancing and refining exploration results.

Bradda Head believes the application of advanced geochemical vectoring tools such as PEG could be valuable across its broader Arizona pegmatite portfolio, including the Whistlejacket Project, where recent drilling and field programs three years ago by Kennecott Exploration Company, have identified extensive spodumene-bearing pegmatites with limited evidence of lithium-mica alteration (see PR 04/07/2026). The Whistlejacket database currently includes approximately 18 drill holes and more than 400 surface samples, with an additional ~350 surface samples currently being collected to further refine exploration targeting.

The Company believes the integration of the PEG methodology with ongoing drilling, mapping, and geochemical programs has the potential to significantly enhance exploration efficiency and improve the understanding the controls of lithium mineralization controls across the Company's pegmatite assets, supporting the strategy of advancing high-quality domestic U.S. lithium projects for future battery and energy transition markets.

Figure 1 - Location Map - PEG tool analysis with High Chemical Index of Alteration (CIA) highlighted in map.

Figure 2 - Geological cross section - Midnight Owl main mineralized body interpretation - SD-DH22-024.

Figure 3 - SD-DH22-024 PEG output.

Qualified Person (Bradda Head)

Joey Wilkins, B.Sc., P.Geo., is an external consultant and the Qualified Person who reviewed and approved the technical disclosures in this news release. Mr Wilkins is a graduate of the University of Arizona with a B.Sc. in Geology with more than 40 years of experience in mineral exploration and is a qualified person under the AIM Rules and a Qualified Person as defined under NI-43-101. Mr Wilkins consents to the inclusion of the technical information in this release and context in which it appears.

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION FOR THE PURPOSES OF THE MARKET ABUSE REGULATION (EU No. 596/2014) AS IT FORMS PART OF UK DOMESTIC LAW BY VIRTUE OF THE EUROPEAN UNION (WITHDRAWAL) ACT 2018. UPON THE PUBLICATION OF THIS ANNOUNCEMENT VIA A REGULATORY INFORMATION SERVICE, THIS INSIDE INFORMATION IS NOW CONSIDERED TO BE IN THE PUBLIC DOMAIN AND SUCH PERSONS SHALL THEREFORE CEASE TO BE IN POSSESSION OF INSIDE INFORMATION.

For further information please visit the Company's website: www.braddaheadltd.com.

ENDS

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About Bradda Head Lithium Ltd.

Bradda Head Lithium Ltd. is a North America-focused lithium development group. The Company currently has interests in a variety of projects, the most advanced of which are in Central and Western Arizona: The Basin Project (Basin East Project and Basin West Project) and the San Domingo Project.

The Basin East Project has a Measured Mineral Resource of 20 Mt at an average grade of 929 ppm Li for a total of 99 kt LCE and an Indicated Mineral Resource of 122 Mt at an average grade of 860 ppm Li and an Inferred Mineral Resource of 499 Mt at an average grade of 810 ppm Li for a total of 2.81 Mt LCE (https://www.accesswire.com/883697/bradda-head-lithium-ltd-announces-updated-mineral-resource-expansion-basin-project). A plan of operation was approved by BLM in 2025 for the Basin West area. Now the Company is working on an Environmental Assessment ("EA") permit.

The San Domingo Project comprises 248 claims covering approximately 1850 acres, located primarily on BLM land, along with two Arizona State Land Department claims. To date, 108 drill holes totaling 13,089 m of core drilling have been completed across three drilling campaigns. The project area hosts more than 1,000 mapped pegmatites, of which 18 have been identified as priority targets, with six tested by drilling. The area currently holds two active Notices of Intent (NOI) permits, and updated drilling plans are in place that can be implemented once all required permits for the pegmatite targets are secured. The objective of the next exploration phase is to further delineate the most prospective areas and advance them toward potential Mineral Resource Estimation (MRE) and NI 43-101 compliant reporting.

The Whistlejacket Project comprises nine Arizona State Land Department Mineral Exploration Permits (MEPs), covering a total of 4,486.07 hectares. The project is subject to a definitive Option to Joint Venture agreement with Kennecott Exploration Company ("KEX") and targets spodumene-bearing pegmatites. KEX previous exploration include 19 drilled diamond drill holes totaling 4,188 meters, with all holes intersecting lithium mineralization. Notable results include 51.0 meters at 1.11% Li₂O in hole WSTL0009 and 19.47 meters at 1.66% Li₂O in hole WSTL0008. In addition, the project has benefited from extensive surface mapping, sampling, airborne geophysics, and the acquisition of high-resolution aerial imagery, significantly enhancing the geological understanding and overall value of the asset.

The Group intends to continue to develop its three phase one projects in Arizona, whilst endeavoring to unlock value at its other prospective pegmatite and brine assets in Arizona, Nevada, and Pennsylvania.

Nominated Adviser Statement

Beaumont Cornish Limited ("Beaumont Cornish"), is the Company's Nominated Adviser and is authorised and regulated in the United Kingdom by the Financial Conduct Authority. Beaumont Cornish's responsibilities as the Company's Nominated Adviser, including a responsibility to advise and guide the Company on its responsibilities under the AIM Rules for Companies and AIM Rules for Nominated Advisers, are owed solely to the London Stock Exchange. Beaumont Cornish is not acting for and will not be responsible to any other persons for providing protections afforded to customers of Beaumont Cornish nor for advising them in relation to the proposed arrangements described in the announcement or any matter referred to in it.