Azrar Copper-Silver Project: Field Work Underway

Aterian plc (LSE: ATN), the Africa-focused critical metals exploration, development and trading company, is pleased to announce that initial exploration fieldwork at its 85%-owned Azrar Copper-Silver Project (“Azrar” or the “Project”) in Morocco has identified multiple copper showings and substantially expanded the known mineralisation footprint at the Amane Target (“Amane”). The work programme has commenced and is fully funded through the Company’s AI joint venture (“JV”) with Lithosquare SAS (“Lithosquare”).

Highlights:

JV-funded exploration has commenced at Azrar, initially focusing on the Amane Target.

Initial mapping of 4 of 22 planned traverses has identified copper showings over an apparent 1.60 km strike length within the now 2.50 km long Amane Target.

New stratabound copper showings have been identified, with mineralised exposures having apparent thicknesses ranging from up to approximately 7m at Amane West and 2m at Amane North.

Historic workings associated with visible copper mineralisation have been identified.

Access preparation and logistical works have been initiated ahead of anticipated scout drilling in Q4 2026.

Hyperspectral data acquisition, processing and drill target-generation are ongoing.

Charles Bray, Executive Chairman of Aterian, commented:

“The initial mapping results strengthen Azrar’s exploration potential by expanding the known copper mineralisation footprint at Amane and identifying multiple copper showings, including in previously unexplored areas. Mapping of only 4 of the 22 planned traverses has identified copper showings over an apparent 1.60 km strike length within the now 2.50 km long Amane Target. Locally, mineralisation has an apparent thickness of up to seven metres, and recently discovered historic workings appear to have targeted copper mineralisation. These results are highly encouraging, although the continuity and full extent of the mineralisation remain to be determined.

Further traverse mapping will seek to extend the mineralised footprint before detailed mapping, sampling and target prioritisation. Access works and detailed mapping are also advancing existing target areas towards drill-ready status, and we are engaging with local drilling contractors ahead of scout drilling in Q4 2026.

We look forward to updating shareholders as the current work programme at Azrar progresses.”

Initial Amane Observations

New mapping has substantially expanded the known footprint of previously discovered mineralisation at the Amane Target. To the north, initial results indicate a strike length potential of 1.00 to 1.20 km; to the west, they indicate an approximate strike length potential of 0.25 km. Apparent thicknesses vary from approximately 1.00 m to 7.00 m, with potential for stacked, cyclical repetitions of mineralisation. The along-strike continuity and extent of the mineralisation remain to be determined.

Mineralisation occurs in two geological settings: gently dipping sandstone-conglomerate beds within the Lower Adoudou Formation sedimentary package; and silica-rich and siltstone-rich beds within the massive dark-grey dolomite of the basal dolomitic sediments (Tamjout dolomite) of the Upper Adoudou Formation sedimentary package.

At the Tifrit Target, previously undiscovered stratabound copper mineralisation has been identified within basal conglomerate and fine-grained sandstone beds of the Lower Adoudou Formation. The mineralisation occurs over apparent widths of 3.00 m and has been traced laterally over 50 m.

The copper mineralisation is characterised by copper carbonate minerals, notably malachite, and minor primary sulphides. The Project will undertake detailed mapping and systematic sampling over priority targets.

Lithosquare-funded exploration programme

The field programme at Azrar has four principal objectives:

Improve access to the priority Amane Target.

Undertake detailed mapping and a topographic survey over an initial drill target at Amane to support detailed drill planning.

Map approximately 22 traverses, totalling 8.20 line km, across prospective basal Adoudou Formation sediments throughout the Project.

Engage with local stakeholders and communities ahead of planning and drilling in Q4 2026.

Hyperspectral data acquisition over the Project is also ongoing. The survey results will be integrated with existing datasets to identify, rank and prioritise targets for ground-truthing and mapping. AI-enabled technology will be used to significantly increase the efficiency of drill target ranking.

Azrar Project Background

Aterian holds an 85% interest in the 76.9 km² Azrar copper-silver project in Morocco’s Western Anti-Atlas. Lithosquare, the Paris-based AI company, holds a 15% interest in the Project. The Azrar project lies approximately 45 km east of Managem Group’s Tizert copper-silver project. Mineralisation at Tizert is not necessarily indicative of mineralisation at Azrar.

The presence of neighbouring deposits underscores the district-scale prospectivity of the Anti-Atlas Belt, although mineralisation at those deposits is not necessarily indicative of mineralisation at Agdz and Azrar.

Illustrations

Qualified Person

For further information, please visit the Company’s website: www.aterianplc.com or contact:

Aterian Plc:

Charles Bray, Executive Chairman - charles.bray@aterianplc.com

Simon Rollason, CEO & Director – simon.rollason@aterianplc.com

Financial Adviser and Joint Broker:

AlbR Capital Limited

David Coffman / Dan Harris

Joint Broker:

SP Angel Corporate Finance LLP

Ewan Leggat / Devik Mehta

Financial PR:

Bald Voodoo - ben@baldvoodoo.com

Ben Kilbey

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Glossary of Terms

The following is a glossary of technical terms: