Ground Magnetics Underway at Agdz Cu-Ag Project

Aterian plc (AIM: ATN), the Africa-focused critical metals exploration company, is pleased to announce the commencement of a ground-based magnetic geophysical survey at its 100%-owned Agdz Copper-Silver Project (“Agdz” or the “Project“) in the Kingdom of Morocco (“Morocco“).

The programme represents a key step in advancing Agdz from surface discovery towards drill target definition, following the Company’s recent announcement on 29 January 2026, which highlighted a significant expansion in the footprint of copper-silver mineralisation.

Highlights:

• 111 line km ground magnetic survey underway across 11.20 km².
• c.28% of the planned survey completed.
• Survey targeting fault-controlled copper-silver bearing breccias identified in recent fieldwork.
• Mineralisation traced over up to 0.9 km strike, with potential for further extension.
• Following up on historic and recent assays, including 3.47 % Cu with 136 g/t Ag and 1.34 % Cu with 31 g/t Ag.
• Expanding total ground magnetic coverage to 322 line km over 20.8 km² (from 195 line km historically)
• This objective is to rapidly define new drill-ready targets across an expanding mineralised footprint.

Strategic Context

The current programme is designed to define the geometry, continuity and scale potential of multiple sub-parallel, structurally controlled mineralised zones, while also exploring for new unrecognised targets across underexplored areas of the Project.

The survey forms part of a systematic exploration workflow that integrates geophysics with ongoing field mapping and sampling, with the objective of rapidly generating a pipeline of high-quality, drill-ready targets.

Importantly, the results of the ground magnetics programme will be integrated with the structural targeting work currently being undertaken by Lithosquare, enabling a multi-disciplinary approach to target refinement and prioritisation.

Charles Bray, Chairman of Aterian, commented:

“The launch of this ground magnetics programme marks the next step forward in progressing Agdz from surface discovery towards new drill target definition.

Following the encouraging results announced earlier this year, which expanded the mineralised footprint and the prior exploratory drilling results, we are now systematically advancing our understanding of the scale and continuity of the system, both along strike and across previously underexplored areas. The results from this survey will also directly support and enhance Lithosquare’s targeting work, ensuring that multiple datasets are integrated to refine and prioritise high-quality targets.

With the survey progressing well and supported by parallel fieldwork, we are focused on rapidly refining targets and building a robust pipeline of drill-ready opportunities as we move Agdz into its next phase of exploration.”

Ground Magnetics Programme

The survey is designed to define the along-strike continuity of multiple sub-parallel, linear copper-bearing fault breccias, which individually outcrop discontinuously over a strike…