Arkle Resources: Phase Two Uranium Drilling & Webinar

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION FOR THE PURPOSES OF THE MARKET ABUSE REGULATION (EU) 596/2014 (AS AMENDED) AS IT FORMS PART OF THE DOMESTIC LAW OF THE UNITED KINGDOM BY VIRTUE OF THE EUROPEAN UNION (WITHDRAWAL) ACT 2018 (AS AMENDED). UPON PUBLICATION OF THIS ANNOUNCEMENT, THIS INSIDE INFORMATION IS NOW CONSIDERED TO BE IN THE PUBLIC DOMAIN.

9th November 2026

Arkle Resources PLC

(“Arkle” or the “Company”)

Start of Phase Two Drilling at Uranium Discovery

&

Notice of Investor Webinar & Presentation

Arkle Resources PLC (LSE: ARK), the energy metals explorer advancing a uranium discovery in Namibia, announces that its Phase Two drilling programme at the Onyofi Project (EPL 8995) in the Erongo Region is commencing on schedule, with the drill rig mobilising to site today.

This drilling programme follows the Company’s uranium discovery confirmed by maiden drilling at the uraniferous leucogranite (“ULG”) target where uranium was intersected in eight of nine holes. Phase Two has been designed to test the ULG system at depth, at closer spacing and laterally beyond the current footprint, including the continuity of the higher-grade sheets, as the first step towards a maiden Mineral Resource Estimate in 2027.

The programme comprises approximately 1,700 metres of reverse circulation (“RC”) drilling on the ULG target and is expected to take three weeks to complete. Holes will be surveyed with a downhole radiometric probe, as in the maiden programme, and samples will be submitted for laboratory assay, with results to be reported as they become available.

In parallel, the mapping, sampling and trenching programme underway since late September is continuing and is scheduled to run through November, working systematically through further targets across the licence package, including an extensive ULG target on EPL 8290. A further three lines of HLEM ground geophysics have been run over the past week on EPL 8298 to map a large paleochannel target in the north-east of the licence. Results from this work will be reported in due course.

Investor Webinar

Arkle’s CEO, Rory Harding, will host a live investor presentation and webinar on Wednesday, 18th November 2026 at 11:00 a.m. GMT, following his return from the field, to discuss the uranium discovery and the next phase of drilling towards a maiden Mineral Resource Estimate in 2027.

On 13th October 2026, Arkle announced the discovery of a uranium system at its ULG target with a footprint of approximately 1.4 kilometres by 600 metres, with mineralisation in eight of nine holes that extends from surface to almost 200 metres downhole and remains open at depth. Rory is currently in Namibia overseeing the Company’s fully funded follow-up drilling programme and inspecting new targets that are being mapped, sampled and trenched in the programme underway since late September.

The presentation will cover:

• What the maiden drilling confirmed at the ULG target and how the results compare with the established leucogranite deposits of the Erongo Region.
• What the follow-up drilling programme now commencing is designed to test, and the path from there towards a maiden Mineral Resource Estimate in 2027.
• The further ULG and paleochannel targets across the licence package that are now being mapped, sampled and trenched.
• The uranium market, where a growing supply deficit and record long-term contract prices frame the opportunity.

The webinar is open to all existing and prospective investors. Questions may be submitted in advance through the contact form on Arkle’s website at https://arkleresources.com/contact or at any time during the live presentation.

The webinar will be accessible via the following link, and a recording will later be made available on the Company's website.

Webinar registration link: https://zoom.us/webinar/register/WN_fe7Nc0utS062rqG0nUwuuA.

Rory Harding, Chief Executive Officer, commented:

“I am currently in Namibia assessing the results of the trenching programme underway across our licences and overseeing the start of this next phase of drilling.

“The webinar on 18th November is an opportunity for existing and prospective investors to hear what the discovery means for Arkle and what the current drilling is designed to achieve on the path to a maiden Mineral Resource Estimate in 2027, to understand how the strength of the uranium market frames the opportunity, and to put their questions to me directly. I would encourage anyone with an interest in Arkle, or in uranium more broadly, to join us.”

Updated Corporate Presentations

Following the drilling results, Arkle will shortly publish updated long-form and short-form corporate presentations on its website, which will be available at: https://arkleresources.com/investor#object-ee7c42d3-e1a2-4415-8441-600efea03d5b.

Enquiries:

About Arkle Resources

Arkle Resources PLC (LSE: ARK; OTCID: UARKF) is a London-listed, uranium-focused energy metals exploration company with projects in Namibia, Botswana and Ireland. Its primary focus is advancing the uranium discovery made in 2026 on its licences in Namibia's Erongo Region, alongside its zinc interest in Ireland and its lithium brine licences in Botswana.

In January 2026, Arkle acquired an 85% interest in Namibia Uranium (Pty) Ltd, which holds four Exclusive Prospecting Licences covering 540 km² in the Erongo Region, including EPL 8995 (the Onyofi Project), which adjoins Orano's Trekkopje mining licence. In October 2026, the Company confirmed a uranium discovery at its uraniferous leucogranite (“ULG”) target on EPL 8995, where maiden drilling intersected uranium mineralisation in eight of nine holes across approximately 1.4 km by 0.6 km, from surface to almost 200 m downhole. The discovery remains open at depth, with fully funded follow-up drilling now commencing as the first step towards a maiden Mineral Resource Estimate in 2027.

Beyond uranium, Arkle holds an estimated 21.38% interest in the Stonepark zinc-lead project in County Limerick, Ireland, which hosts an Inferred Mineral Resource of 5.1 Mt grading 11.3% combined zinc and lead and is being advanced by the operator, Group Eleven Resources (TSX-V: ZNG), at no cash cost to Arkle. The Company also holds 100% of three lithium brine prospecting licences covering 1,612 km² of Botswana's Makgadikgadi Salt Pans.

For more information visit: www.arkleresources.com

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