Drill Programme Commences at Whistlejacket

Bradda Head Lithium Ltd

20 August 2026

20 August 2026

Bradda Head Lithium Ltd

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

Commencement of drill programme at the Whistlejacket Pegmatite Project, Arizona

Bradda Head Lithium Ltd (AIM: BHL), the North America-focused lithium development company, is pleased to announce the commencement of its infill exploration drilling programme at its Whistlejacket Lithium Pegmatite Project ("Whistlejacket" or the "Project"), which is subject to the Company's Option to Joint Venture agreement with Kennecott Exploration Company.

The programme has been designed to test and expand priority lithium-bearing pegmatite targets across Whistlejacket. Drill targeting integrates historical drilling and exploration data with Bradda Head's geological mapping, surface sampling and recent high-grade lithium assay results, providing a robust geological framework for the programme.

The campaign represents an important next step in evaluating the scale, continuity and grade potential of the lithium mineralisation at Whistlejacket and advancing the Project towards resource definition.

Ian Stalker, Executive Chairman of Bradda Head, commented:

"We are pleased to commence drilling at Whistlejacket, marking an important step in advancing the Project. The programme targets priority lithium-bearing pegmatites identified through extensive mapping, sampling and historical drilling, with the objective of demonstrating further scale and continuity of mineralisation across Whistlejacket and move towards a Maiden Mineral Resource Estimate."

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 / Josephine Clerkin
+44 1624 639 396	+44 20 7628 3396	+44 207 186 9927	+ 44 20 7920 3150 braddahead@tavistock.co.uk

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. The Company is currently progressing the Environmental Assessment ("EA") process for the Basin West area.

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 2,010.7 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.

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