Bradda Head Lithium Ltd

05 October 2026

5 October 2026

Bradda Head Lithium Ltd

(“Bradda”, "BHL" or the "Company")

Bradda Head Intersects Broad Zones of Visible Spodumene Mineralization at Whistlejacket, Arizona

Bradda Head Lithium Ltd (AIM: BHL), the North America-focused lithium development company, is pleased to announce that significant intersections of visual spodumene mineralization has been logged in the first three diamond drill holes completed at the Whistlejacket Lithium Project ("Whistlejacket" or "WJ"), held under the Company's Option to Joint Venture agreement with Kennecott Exploration Company ("KEX").

Highlights:

• First three drill holes completed at the Whistlejacket project in Arizona, with a fourth hole in progress.
• All three holes (WSTL0020, WSTL0021 and WSTL0022) have intersected broad zones of visible fresh spodumene mineralization, intervals reported are down-hole lengths belonging to the main mineralized body in the area, comprising:
  • WSTL0020: structure of 31.8m of visible fresh spodumene mineralization from 161.85m to 193.65m,
  • WSTL0021: intervals of 6.41m (from 203.09m to 209.5m) and 19.23m (from 210.1m to 229.33m) of fresh spodumene mineralization,
  • WSTL0022: structure of 46m from 61.87m to 107.87m with fresh spodumene mineralization.
• Visual assessment and logging of WSTL0020, WSTL0021 and WSTL0022 have identified numerous intervals with fresh spodumene crystals.
• Drill core samples from WSTL0020 have been shipped to the lab, with results expected in the coming weeks; samples from WSTL0021 will be shipped over the next few days with samples from WSTL0022 being shipped shortly thereafter.
• Drilling will continue at Whistlejacket with WSTL0023 to further define the 3D shape of the main mineralized body.

Note: ‘Visual estimates of mineralization are preliminary and are not necessarily indicative of grade or true width; laboratory assay results may differ materially from visual observations.’

Ian Stalker, Executive Chair, commented:

“These are highly encouraging visual indications from our maiden drilling programme at Whistlejacket. To have logged broad, visually identifiable spodumene pegmatite in all three of our first holes – and in particular the scale of the intercepts at WSTL0020 and WSTL0022 – gives us real confidence in the size and continuity of this system, building directly on Kennecott’s earlier drilling. With assay results due over the coming weeks and a fourth hole already underway, we look forward to updating shareholders as we continue to define this exciting project.”

Visual Mineralization and Drill program overview

To date, three drill holes have been completed within the main target area, out of approximately 24 planned for 2026. Drilling has returned encouraging spodumene-bearing intercepts, with fresh spodumene associated with albite, quartz, K-feldspar and muscovite, as documented in photos from the 2026 drill campaign (Figure 1). The spodumene crystal size and mineralogy observed are consistent with previous KEX observations, which had demonstrated high lithium deportment to spodumene and encouraging Dense Media Separation (DMS) potential through earlier testwork (see PR 04/07/2026). These initial drilling observations provide further support for future metallurgical testwork aimed at evaluating the potential to produce a clean spodumene concentrate.

Figure 1.-Mineralized core examples from drill holes completed, showing spodumene crystals: (A) WSTL0020 at 174m; (B)WSTL0020 at 183m; (C)WSTL0021 at 215.5m; (D)WSTL0022 at 80m.

WSTL0020 and WSTL0021 were drilled from a common pad at the south end of the section, fanning down‑hole to the west‑southwest, while WSTL0022 was drilled from a separate, northern collar, converging beneath the pegmatite (Figure 2 & 3). WSTL0020 reached an end of hole (“EOH”) of 229.36m and logged strong visual spodumene from 45.75m–48.24m and 58.30m–61.26m, a pegmatite interval (visually barren of spodumene) from 110.94m–116.10m, and a further strong visual spodumene zone from 161.85m–193.65m, before terminating in metavolcanic host rock at 229.36m with no further mineralization noted. WSTL0021, the deepest of the three, was extended to an EOH of 242.01m and intersected strong visual spodumene from 64.40m–68.12m and 99.21m–101.40m, a pegmatite interval from 175.65m–179.62m, and two further strong visual spodumene zones from 203.09m–209.50m and 210.10m–229.93m — the latter, at almost 20m, the second‑widest single intercept on the section — before also ending in metavolcanic host rock at 242.01m. WSTL0022, the shallowest hole at an EOH of 137.76m, returned strong visual spodumene from 43.82m–49.48m and 55.57m–59.20m and a broad 62.27m–102.14m interval — the widest single intercept recorded on the section, at almost 40m — with the hole again ending in metavolcanic host rock at 137.76m.

Figure 2 - Drill hole location plan

Figure 3 - Cross Section with drill holes WSTL0020, WSTL0021 & WSTL0022 including downhole visible spodumene mineralization.

Qualified Person (Bradda Head)

Joey Wilkins,B.Sc.,P.Geo., isan external consultant and the Qualified Person who reviewed and approved the technical disclosures in this news release.Mr Wilkinsis a graduate of theUniversity of Arizonawith aB.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 Wilkinsconsents 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 OFUKDOMESTIC LAW BY VIRTUE OF THEEUROPEAN 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

Contact:

Bradda Head Lithium Limited	Beaumont Cornish	Shard Capital	Tavistock
Company	Nomad	Broker	Investor Relations
Ian Stalker, Executive Chair Denham Eke, Finance Director	James Biddle / Roland Cornish	Damon Heath / Isabella Pierre	Nick Elwes
+44 1624 639 396	+44 20 7628 3396	+44 207 186 9927	+ 44 20 7920 3150 braddahead@tavistock.co.uk

AboutBradda Head Lithium Ltd.

Bradda Head Lithium Ltd is a North America-focused lithium development group. The Company's principal interests include the Basin Project, comprising Basin East and Basin West, and the San Domingo Project in Arizona.

The Basin East Project has a Measured Mineral Resource of 20 Mt at an average grade of 929 ppm Li, containing 99 kt LCE; 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. Together, these categories contain 2.81 Mt LCE. A plan of operations for the Basin West area was approved by the Bureau of Land Management in 2025, and the Company is progressing the associated Environmental Assessment.

The San Domingo Project comprises 248 claims covering approximately 1,850 acres, located primarily on Bureau of Land Management land, together with two Arizona State Land Department claims. To date, 108 drill holes totalling 13,089 m have been completed across three drilling campaigns. More than 1,000 pegmatites have been mapped across the project area; 18 have been identified as priority targets and six have been drill-tested. Two Notices of Intent are active, and updated drilling plans may be implemented once the required permits have been secured. The next exploration phase is intended to further delineate prospective areas and assess their potential to support a Mineral Resource Estimate prepared in accordance with NI 43-101.

The Whistlejacket Project comprises nine Arizona State Land Department Mineral Exploration Permits covering 2,010.7 hectares. The project is subject to a definitive option-to-joint-venture agreement with Kennecott Exploration Company and targets spodumene-bearing pegmatites.

Kennecott'spreviousexploration included19 diamond drill holestotalling4,188m,allof which intersectedlithiummineralisation.Reported results include 51.0 m at 1.11% Li₂O in hole WSTL0009 and 19.47 m at 1.66% Li₂O in hole WSTL0008. Surface mapping, sampling, airborne geophysics and high-resolution aerial imagery have also contributed to the geological dataset for the project.

The Group intends to continue advancing its three principal projects in Arizona while seeking to realise value from 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 person for providing the protections afforded to customers of Beaumont Cornish nor for advising them in relation to the transaction and arrangements described in the announcement or any matter referred to in it.

Glossary of Terms

Term	Definition
AIM	The London Stock Exchange's market for smaller, growing companies. Bradda Head Lithium Ltd trades on AIM under the ticker BHL.
Albite	A sodium-rich feldspar mineral commonly found in pegmatites alongside spodumene, quartz, K-feldspar and muscovite.
Bureau of Land Management (BLM)	The U.S. federal agency that administers public lands, including land on which portions of the Company's Arizona projects are located.
Claim (mining claim)	A legal right to explore for and, subject to permitting, extract minerals from a defined parcel of land.
Collar	The surface location where a drill hole begins.
Cross section	A vertical slice through the ground used to show the geometry of drill holes and mineralized zones relative to one another.
Diamond drill hole / diamond drilling	A drilling method that uses a diamond-tipped bit to cut a cylindrical rock “core” sample, allowing direct visual and laboratory analysis of the rock and mineralization intersected.
DMS (Dense Media Separation)	A physical ore-processing technique that separates minerals by density, used to produce a concentrate; an early indicator of how amenable an ore may be to simple, low-cost processing.
Down-hole	Measured along the length of a drill hole, as opposed to true (perpendicular) thickness; down-hole intercept lengths can overstate the real thickness of a mineralized zone depending on the angle of intersection.
End of hole (EOH)	The total depth reached by a drill hole.
Grade	The concentration of a valuable mineral or element within rock, typically expressed as a percentage or in parts per million (ppm).
Indicated Mineral Resource	A mineral resource category defined under NI 43-101 with a level of geological confidence sufficient to support mine planning, but lower than a Measured Mineral Resource.
Inferred Mineral Resource	The mineral resource category with the lowest level of geological confidence under NI 43-101, based on limited data; it carries greater uncertainty than Indicated or Measured categories.
Intercept / intersection	The length of mineralized rock encountered by a drill hole, usually reported as a down-hole interval (e.g. “31.8m from 161.85m to 193.65m”).
K-feldspar (potassium feldspar)	A common rock-forming mineral found in pegmatites alongside spodumene.
LCE (Lithium Carbonate Equivalent)	A standard industry measure used to express the quantity of lithium contained in a resource or product as if it were entirely converted to lithium carbonate, allowing comparison across different lithium-bearing minerals and compounds.
Li₂O (lithium oxide)	A unit commonly used to report lithium grade in spodumene mineralization and concentrates (e.g. “1.11% Li₂O”).
Market Abuse Regulation (MAR)	UK/EU regulation governing the disclosure of inside information by publicly listed companies, incorporated into UK law following Brexit.
Measured Mineral Resource	The mineral resource category with the highest level of geological confidence under NI 43-101, based on closely spaced sampling and drilling.
Metallurgical testwork	Laboratory testing conducted to determine how efficiently a mineral can be extracted and concentrated from ore using various processing methods.
Metavolcanic rock	Volcanic rock that has been altered by metamorphism (heat and pressure); at Whistlejacket, it forms the host rock surrounding the mineralized pegmatite.
Muscovite	A silvery mica mineral commonly associated with spodumene-bearing pegmatites.
NI 43-101	“National Instrument 43-101 – Standards of Disclosure for Mineral Projects,” the Canadian securities regulatory standard governing how companies disclose scientific and technical information about mineral projects.
Nominated Adviser (Nomad)	A firm authorised and regulated by the UK Financial Conduct Authority that advises and guides an AIM-listed company on its regulatory responsibilities; Beaumont Cornish Limited is the Company's Nominated Adviser.
Notice of Intent (NOI)	A regulatory filing submitted to the Bureau of Land Management describing proposed exploration activities that disturb public land, required before certain work can proceed.
Pegmatite	A very coarse-grained igneous rock, often associated with granite intrusions, that can host economically significant concentrations of spodumene and other lithium-bearing minerals.
ppm (parts per million)	A unit of concentration; 10,000 ppm is equivalent to 1%. Commonly used to express lithium grades in mineral resource estimates.
Qualified Person (QP)	An individual meeting defined professional and experience criteria under NI 43-101 (or an equivalent standard under the AIM Rules) who reviews and takes responsibility for technical disclosures in a company's public statements.
Spodumene	A lithium aluminum silicate mineral (LiAlSi₂O₆) and the primary ore mineral targeted at Whistlejacket; it is a key source of lithium for battery production.
Spodumene concentrate	A processed product with an elevated, more consistent lithium content, produced from ore through beneficiation methods such as dense media separation, ready for further downstream processing.
True width / true thickness	The actual thickness of a mineralized zone measured perpendicular to its orientation, as distinct from the (typically longer) down-hole intercept length, which depends on the angle at which the drill hole crosses the zone.

This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.
RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our Privacy Policy.