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23 February 2026

Arkle Resources PLC

("Arkle" or the "Company")

Company Updates

Recent Acquisition Places Uranium at the

Centre of Arkle's Strategy - With Exploration to Begin Imminently

Arkle Resources PLC (LSE:ARK), the energy metals explorer with a key focus on uranium, is pleased to provide an update on its strategy and project portfolio.

In January 2026, Arkle completed a transformative acquisition of four uranium exploration licences in Namibia's Erongo Region. As a result, Arkle now uniquely offers investors uranium discovery exposure in one of Africa's key uranium belts, proximal to some of the world's largest uranium producers.

The Company's portfolio comprises complementary metals which are essential for the generation and storage of clean energy - uranium, lithium and zinc - in the premier mining jurisdictions of Namibia, neighbouring Botswana, and Ireland.

Portfolio Summary - Priority Projects

Uranium in Namibia

Poised to Imminently Commence Funded Exploration Programme on Shallow Prospects Adjacent to Major Projects in the World's Third Largest Uranium Producing Country

Arkle's projects are situated in prime acreage in one of Africa's key uranium belts.

Highlights

·    Four 85%-held Exclusive Prospecting Licences ("EPLs") in the Erongo Region covering 540 km²

·    EPLs are adjacent to three major uranium projects

·    2025 exploration identified significant uranium anomalies on all four licences with surficial, easy-to-explore targets

·    Namibia is a recognised tier-one supplier to global utilities and is the world's third largest uranium producer

·    Arkle's technical team has experience at Rössing, Langer Heinrich, Forsys and Cameco

Close Proximity to Large Deposits

The four EPLs cover prime acreage in one of Africa's key uranium belts. This standout uranium region contains ~1.2 Blb U₃O₈ in Measured and Indicated Resources and ~235 Mlb U₃O₈ in Inferred Resources. The region has produced > 350 Mlb of U₃O₈ in the last 45 years.

Arkle's EPLs 8995 and 8290 are contiguous to the Trekkopje deposit, one of the most significant calcrete-hosted uranium deposits globally, currently under assessment by Orano for start-up.

EPL 8298 is contiguous to the Marenica deposit which recently reported a doubling of resource grade.

EPL 7986 is contiguous to the Rössing uranium mine, one of the world's largest alaskite-hosted uranium deposits, which has been mined since 1976 and is still producing over 6 Mlb per annum U₃O₈.

Work to Date on Arkle's EPLs

Multiple geochemical and radiometric (at 200m-line-spacing dataset) anomalies have been identified on the EPLs, with 2025 grab samples assaying up to 3,855 ppm U₃O₈. Additional potential for alaskite-hosted deposits has been identified on the EPLs.

A sampling programme was carried out in 2025 comprising 178 samples taken from small pits dug to depths of 0.35 to 0.5 m. Highlights from the programme included:

EPL 8995 and 8290

·    Uranium in calcrete values up to 2,782 ppm U₃O₈ - surficial uranium confirmed in all areas surveyed

·    Uranium in alaskite values up to 3,855 ppm U₃O₈ - strong indications of the presence of basement highs and potential alaskite mineralisation surrounding Trekkopje's large paleochannel systems which may extend into Arkle's tenements

EPL 7986

·    Uranium in alaskite values up to 2,923 ppm U₃O₈ - adjacent to Rössing and located on margins of the same domal structure and mineralisation

Next Steps

Arkle is now fully funded to carry out the following priority work:

Phase 1 (commencing imminently):

Initial exploration work will include four lines of horizontal loop electromagnetic survey ("HLEM") across potential paleochannels on EPL 8995 and an airborne radiometric and magnetic survey of licences EPL 8995, EPL 8290 and EPL 8298, as well as mapping and downhole logging of historical drill holes on the licences.

Arkle has signed a contract with Xcalibur Smart Mapping, a leader in the airborne and mapping geophysics industry, to undertake a substantial airborne survey of more than 12,000 line-kms at 50 m-line-spacing for extensive target generation. The Company is in the process of obtaining the necessary aviation permits to conduct the survey and expects to begin imminently alongside the HLEM. Further updates will be provided as these workstreams progress. 

Phase 2 (commencing H2 2026):

Initial exploration work will focus on targets developed from Phase 1 and will include detailed mapping (with potential for further geophysical surveys), additional sampling, and up to 4,000 metres of RC drilling.

Initial work on EPL 7986 will focus on mapping and developing a model of the alaskite outcrop. 

A successful 2026 drill programme would be followed by detailed infill drilling, leading to the estimation of a maiden Mineral Resource Estimate in H1 2027.

Lithium in Botswana

Indications of an Extensive Brine System in One of Africa's Most Prospective Settings for Lithium Brine Deposits

Arkle holds 100% of three Prospecting Licences ("PLs") in the Makagdikgadi Salt Pans covering 1,612 km².

Highlights

·    Geophysical surveys of PL 148 and PL 075 carried out in 2024 confirmed the presence of continuous thick brine-bearing conducting layers with some thin conducting layers within the top 5m from the surface

·    The thickness of the more conducting layers at depth ranged from approximately 30 m to 60 m

·    Geochemical sampling in 2024 identified lithium in all samples tested, alongside significant magnesium grades, establishing the prospectivity of the licensed areas

·    Further geophysical surveys conducted in Q4 2025 now also indicate the presence of brines to depths of approximately 25 metres on PL 1716

·    Further exploration and drilling is planned to assess lithium brine concentrations at depth

·    Environmental Impact Assessment ("EIA") is underway as a prerequisite to drilling

·    Botswana consistently ranked among the world's top destinations for mining investment

Work to Date

Geophysics and soil sampling across the licence package in 2024-2025 indicate brines to shallow depths across a large area, with confirmed lithium in samples.

There are also significant grades of magnesium that may be economically extracted as an additional product under the process of Direct Lithium Extraction ("DLE") where it is now possible to extract 100% of the magnesium from the brines as a second income stream.

The initial stages of the EIA have been completed with the full study targeted for completion by June 2026.

Next Steps

The scale of the Makgadikgadi licence package and the consistency of brine indications across all three licences highlight the potential for a large brine system.

Accurate lithium content can only be determined by drilling shallow holes down to 30 m to obtain brine samples for DLE.

Upon completion of the EIA and receipt of the necessary regulatory approvals, the Company intends to design an initial drilling programme to test brine aquifers across priority targets.

Such a programme (subject to further funding) would be expected to include the collection of brine samples for laboratory analysis to determine lithium grades, magnesium content and impurity profiles, together with hydrogeological testing to assess aquifer permeability, porosity and brine flow characteristics.

Further work, subject to funding and the results of the sampling programme, would also evaluate potential processing routes, including the suitability of DLE technologies.

Zinc in Ireland

Material Stake in Advanced Stage High-Grade Deposit in Europe's Most Prospective Zinc District

Arkle holds a 22.36% joint venture interest in the Stonepark zinc project in County Limerick, alongside Group Eleven Resources Corp (TSX-V:ZNG) ("Group Eleven"), in which Glencore is a ~14% shareholder. Stonepark is formed of seven contiguous prospecting licences covering an area of 201 km².

Highlights

·    Inferred Mineral Resource of 5.1 Mt grading 11.3% combined zinc and lead (8.7% Zn, 2.6% Pb) - deposit remains open along and across strike

·    Adjacent to Glencore's Pallas Green zinc project, one of the world's largest undeveloped zinc-lead deposits at 45.4 Mt

·    Higher grade and shallower (190-395 m depth) than the neighbouring Pallas Green deposit (8.4% Zn+Pb)

·    Potential for 'green zinc' due to clean metallurgy, proximity to European smelters, and wind power capacity

A Proven Zinc District

Ireland is ranked number one in the world for zinc discovered per square kilometre. It is home to some of the world's largest and highest-grade zinc deposits, including Tara (120 Mt+ mined since 1977, Europe's largest zinc mine), Lisheen (22.3 Mt at 11.7% Zn), and Galmoy (8Mt at 12% Zn).

Six zinc mines have been permitted and operated over the past 60 years, and every major Irish zinc discovery has been profitably mined. Majors active in Ireland include Boliden and Glencore.

Work to Date

The joint venture's thesis is that the Carrickittle area within the Stonepark project may host a "mirror image" of the mineralising system that created Glencore's adjacent Pallas Green deposit on the opposite side of the Limerick Volcanic Complex.

In 2022, drilling at Carrickittle West intersected the first major fault structure directly drilled in the Limerick region - a fault with 150 m of vertical displacement and zinc mineralisation on both sides.

Three follow-up holes were drilled on Stonepark ground in late 2024, totalling 1,372 m at depths of 350-550 m. Results released in 2025 demonstrated proximity to strong mineralisation.

Next Steps

Group Eleven's recent focus has been on nearby exploration at their Ballywire prospect (on a wholly owned Group Eleven licence, southeast of Stonepark) indicating high-grade zinc-lead-silver mineralisation over a 2.6 km trend that remains open in all directions.

Group Eleven plans step-out drilling around the known resource at Stonepark as well as a follow-up drill programme on the Carrickittle West prospect (within the Stonepark licence) which is being designed. In June 2025, Group Eleven's Chief Executive Officer stated he regards Carrickittle West as one the best drill targets in Ireland.

Rory Harding, Arkle's newly appointed Interim Chief Executive Officer, commented:

"Arkle's strategic shift in emphasis to uranium in Namibia is complete, supported by highly prospective and complementary energy metals projects in Botswana and Ireland.

Our Namibian uranium licences, which now take centre stage, feature shallow, easy-to-explore targets near the Trekkopje, Marenica, and Rössing deposits, while our Botswana lithium projects show extensive brine systems and our Irish zinc project offers significant upside potential to an existing resource.

With a fully funded uranium exploration programme due to commence imminently, Arkle now provides unique and near-term exposure to discoveries in a prolific uranium region. Indeed, the Company is now one of the few London-listed uranium explorers and our vision is to become a pre-eminent uranium exploration and development vehicle across Africa's key uranium belts.

I believe Arkle's portfolio represents a compelling energy metals exploration investment case, with existing resources underpinning the Company's valuation and considerable exploration upside - this is an extremely exciting time to be an Arkle shareholder."

Additional Projects

Arkle holds interests in the following two other projects which are not currently core to the Company's forward development strategy.

Lithium & Tungsten in Ireland

The Company holds 100% of four Prospecting Licences in Aughrim, County Wicklow, proximal to the Leinster Granite, where a large zone of lithium-bearing pegmatites and aplites has been discovered by the International Lithium Corp-Ganfeng Lithium Co joint venture.

In 2023, Arkle announced the discovery of lithium-bearing pegmatites on its licences, with one assay returning 0.09% Li₂O. Additional samples returned elevated levels of beryllium, tungsten, tin, and copper, indicating a complex mineralising system.

Arkle is assessing the potential of the Aughrim licences as a tungsten project, underpinned by strong market thematics for the metal which is essential for defence and energy transition technologies.

Gold in Ireland

Arkle holds a gold exploration licence in Ireland in County Donegal and is reviewing options which may include joint venture, partnership, or divestment.

New Website

Arkle intends to launch a new website at the same domain of www.arkleresources.com reflecting the Company's forward strategy next week. The Company encourages investors to review the website after launch which will include project maps. Arkle intends to publish an updated investor presentation and convene an investor webinar soon.

Contacts:

About Arkle Resources

Arkle Resources PLC (LSE:ARK) Arkle is a multi-commodity exploration company focused on metals which are essential for the generation and storage of clean energy - uranium, lithium and zinc. Its projects are in tier-1 mining jurisdictions in Namibia, Botswana and Ireland, adjacent to world-class deposits.

Founded in 2004 by John Teeling and Jim Finn, the Company co-discovered the Stonepark zinc deposit in County Limerick - now Ireland's second largest undeveloped resource - in joint venture with Teck Ireland. Teck's interest was acquired by Group Eleven Resources (TSX-V: ZNG), who continue to advance the project alongside Arkle.

In January 2026, the Company announced a transformative deal to acquire Namibia Uranium Pty Ltd, which has introduced four highly prospective uranium licences contiguous to major producing and development assets in what is a world-class uranium jurisdiction.

This acquisition, alongside the Company's existing licence portfolio and the introduction of new management, repositions Arkle to become a leading explorer in energy metals.

For more information visit: www.arkleresources.com

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