Stonepark Zinc Project – Operations Update

Arkle Resources PLC

16 April 2026

 

16 April 2026

Arkle Resources PLC

("Arkle" or the "Company")

Stonepark Zinc Project - Operations Update

Group Eleven to Mobilise a Rig at Stonepark Zinc Project Imminently for four-hole, 2,700 m Drill Programme Phase

Arkle Resources PLC (LSE:ARK), the energy metals explorer with a key focus on uranium, is pleased to note the announcement [today/yesterday] by Group Eleven Resources Corp. (TSX.V: ZNG; OTCQB: GRLVF; FRA: 3GE) ("Group Eleven"), that it is mobilising a drill rig to the  Stonepark Zinc Project ("Stonepark") (Arkle: 22.36%) this week.

A four-hole drill programme totalling 2,700 m is planned, comprising: one hole at the Stonepark deposit (5.1 Mt grading 11.3% combined Zn and Pb (8.7% Zn, 2.6% Pb), testing beneath known Zn-Pb mineralisation for possible Cu mineralisation; one hole at the Kilteely prospect; and two holes at or near the Bruff prospect.

One hole (25-449-04) was drilled late last year at the Bruff prospect to a depth of 480 m. This hole tested the base of the Waulsortian Limestone near a suspected fault structure. A significant zone of blocky calcite was intersected from 194 m to 200 m with a brecciated lower contact, while minor disseminated pyrite was observed in the 10 m above the base of the Waulsortian Limestone at 445 m. While assays (recently received by Group Eleven) did not return anomalous grades, Group Eleven considers the hole is encouraging as it shows a geological environment prospective for Irish-type zinc mineralisation (i.e. calcite zones, brecciation and sulphides).

This imminent four-hole programme is part of an expanded Stonepark drilling programme of approximately 15,500 m, as announced by Group Eleven on 12 March 2026.

In prioritising current exploration capital towards the Company's Namibia uranium projects, Arkle has elected not to participate in funding this particular phase of Stonepark drilling. As a result, Arke's interest in Stonepark is estimated to decrease fractionally from 22.36% to 21.38% (subject to cost actuals after fieldwork completion). Arkle retains the option to participate financially in the rest of the drilling programme to maintain its equity position.

Group Eleven intends to provide further information on this programme later this year.

Stonepark Zinc Project

Arkle co-discovered the Stonepark zinc deposit in County Limerick - now Ireland's second largest undeveloped resource - in a joint venture with Teck Ireland. Teck Ireland's interest was acquired by Group Eleven. Group Eleven (in which Glencore is a 13.6% shareholder) continues to advance the project alongside Arkle.

Stonepark is formed of five contiguous prospecting licences covering an area of 148 km² and is adjacent to Glencore's Pallas Green zinc project, one of the world's largest undeveloped zinc-lead deposits at 45.4 Mt.

Stonepark has an Inferred Mineral Resource of 5.1 Mt grading 11.3% combined Zn and Pb (8.7% Zn, 2.6% Pb) - and the deposit remains open along and across strike. It is higher grade and shallower (190-395 m depth) than the neighbouring Pallas Green deposit (8.4% Zn+Pb).

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.

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.

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

Building on the above geological observations, Group Eleven is mobilising a rig to Stonepark this week, supplementing the four rigs operating at its nearby Ballywire prospect.

Group Eleven's announcement can be found here: https://money.tmx.com/quote/ZNG/news/7179313468668130/Group_Eleven_Drills_235m_of_123_ZnPb_and_46_gt_Ag_Further_Confirms_Deeper_CuAg_Mineralization_and_Extends_Mineralized_Strike_by_600m_to_32km.

Rory Harding, Interim Chief Executive Officer, commented:

"Arkle welcomes the update from Group Eleven that it is mobilising a rig to Stonepark imminently to start a four-hole, 2,700 m phase of drilling. Whilst Arkle's core focus is on our uranium exploration opportunity in Namibia, zinc is a critical and strategic mineral and so we consider Arkle's interest in one of Europe's most prospective zinc projects to be an additional opportunity for significant value creation for Arkle shareholders. We look forward to further updates on drilling from Group Eleven in due course."

Contacts:

Arkle Resources Rory Harding, Interim CEO John Teeling, Chairman	[phone] [phone]
SP Angel Corporate Finance Matthew Johnson Charlie Bouverat Adam Cowl	Nominated Adviser & Joint Broker [phone]
First Equity Limited Jason Robertson	Joint Broker [phone]
Vigo Consulting	UK Media & IR
Ben Simons Safia Colebrook	[phone] [e-mail]
Teneo Luke Hogg Molly Mooney	Ireland Media [phone]

Glossary

Ag	Silver
Pb	Lead
Zn	Zinc

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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