Uranium Exploration Commenced in Namibia

26 February 2026

Arkle Resources PLC

("Arkle" or the "Company")

Uranium Exploration Commenced in Namibia

Geophysical Surveys Underway for Extensive Target Generation

on Arkle's Namibian Uranium Projects

Arkle Resources PLC (AIM: ARK), the energy metals explorer with a key focus on uranium, is pleased to announce the initiation of its Phase 1 uranium exploration programme in Namibia, with airborne and ground based geophysical surveys now underway.

In January 2026, Arkle completed a transformative acquisition of four uranium exploration licences in Namibia's Erongo Region, covering 540 km². As a result, Arkle now provides investors with unique London Stock Exchange-listed uranium discovery exposure in one of Africa's key uranium belts, proximal to some of the world's largest uranium producers.

Following a successful sampling programme in 2025, which confirmed the presence of surficial uranium on Arkle's licences, the Company is fully funded to advance a two-phase work programme as detailed further below.

Key Geophysics Workstreams Underway

·    One of three planned lines of horizontal loop electromagnetic survey ("HLEM"), primarily to test the potential paleochannels on EPL 8995, has already been completed (see Figure 1).

·    The HLEM survey will assist in mapping the basement rock profile of channels allowing geophysicists to determine the potential depth and extent of fill across the paleochannels.

·    The HLEM work is expected to be completed by early March.

·    Following the receipt of aviation permits, Xcalibur Smart Mapping, a leader in the airborne and mapping geophysics industry, has today commenced a substantial airborne survey of more than 12,000 line-kms at 50m-line-spacing for extensive target generation (See Figure 2).

·    These lines will be 4x tighter than line spacing from the 1970s government data sets, providing significantly higher resolutions to identify both magnetic and radiometric targets on the ground.

·    The airborne survey is expected to be completed by mid-March with final delivery of the processed data anticipated within 30 days of completion of data acquisition.

·    Analysis of data from both these surveys will be used to prioritise areas for follow-up mapping and sampling.  This in turn will guide the identification of drill targets.

Phase 2 exploration work to begin in H2 2026 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 Reverse Circulation drilling.

A successful 2026 drill programme would be followed by a phase 3 programme which would include detailed infill drilling, leading to the estimation of a maiden Mineral Resource Estimate in H1 2027.

Initial work on EPL 7986 will be focused on mapping, sampling and developing a model of the alaskite outcrop. 

Rory Harding, Interim Chief Executive Officer, commented:

"Fortuitous contractor availability and a smooth permitting process in Namibia has resulted in Arkle getting boots on the ground and a plane in the air faster than anticipated. Our fully funded two phase uranium exploration programme has started, and we are now progressing systematic geophysical work to generate high-quality drill targets for later this year.

I believe the beginning of a sustained global nuclear expansion cycle is underway with new projects being required to fill the forecast major supply deficit. Arkle offers uranium exposure in one of Africa's key uranium belts, in close proximity to some of the world's largest uranium producers. We have an exciting period of exploration ahead of us this year."

Background on Arkle's Namibia Uranium Project

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 the identification of 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

Figure 1: Uranium Project Map Showing Proximity to Uranium Deposits

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About Arkle Resources

Arkle Resources PLC (LSE:ARK) 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 premier 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, 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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