Ground Magnetics Underway at Agdz Cu-Ag Project

In brief · summary, not quotable

Aterian plc has commenced a ground-based magnetic geophysical survey at its Agdz Copper-Silver Project in Morocco, covering 11.20 km² with 111 line km of survey. This initiative aims to define drill targets by identifying fault-controlled copper-silver bearing breccias, building on recent findings of mineralisation up to 0.9 km strike length and historical assays including 3.47% Cu with 136 g/t Ag. The survey, which is approximately 28% complete, will expand total ground magnetic coverage to 322 line km over 20.8 km² and is expected to take two weeks for data acquisition, followed by four weeks for interpretation, with the goal of rapidly defining new drill-ready targets.

Full announcement

Select text to share a quote on X · sign in to keep highlights & notes in your ATN notes

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 length of up to 0.9 km. The programme also targets the identification of additional prospective structures that may be hidden beneath the surface.

The programme is being conducted by an independent geophysical contractor using a GEM GSM-19 Overhauser magnetometer, with the following parameters:

60 lines for a total of 111 line km.
Average line length - 1.85 km.
100 m line spacing.
Three contiguous grids covering a total of 11.20 km2.
Estimated a two-week timeframe for data acquisition.
Modelling, interpretation and reporting are estimated at 4 weeks.

Next Steps

Based on the results of the ground magnetics survey, the Company intends to:

Define priority target areas for follow-up work.
Undertake detailed geological mapping and trenching.
Undertake an Induced Polarisation (IP) / resistivity survey over priority targets.
Advance a ranked pipeline of drill-ready targets.

Project Summary

Aterian holds a 100% interest in the 50.4 km² Agdz Copper-Silver Project, comprising the 34.5 km² Agdz licence and the adjacent 15.9 km² Agdz Est licence in central Morocco.

The Project is located in the highly prospective Anti-Atlas Mountains within the Drâa Tafilalet region, approximately 35 km east of Ouarzazate, a well-serviced regional hub with an airport and established infrastructure. The Project benefits from excellent access via paved and unpaved roads. It is situated approximately 40 km southeast of the Noor solar power complex, one of the world's largest renewable energy facilities.

Agdz is located within Morocco's highly prospective Anti-Atlas belt, a stable and well-established mining jurisdiction with growing strategic importance for copper supply.

The Agdz Project is situated within a well-established copper-silver mining district, approximately 14 km southwest of the Bouskour copper-silver mine (19 Mt at 1.44 % Cu and 12 g/t Ag Measured & Indicated and 9 Mt at 1.61 % Cu Proven & Probable1) and within trucking distance of existing mining infrastructure. The world-class Imiter silver mine (192 M Oz Ag Measured & Indicated and 152 M Oz Ag Proven & Probable2) lies approximately 80 km northeast of the Project, with both operations owned by Managem Group. While mineralisation at neighbouring deposits is not necessarily indicative of mineralisation at Agdz, their presence underscores the district-scale prospectivity of the Anti-Atlas Belt.

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

Subscribe to our news alert service: https://atn-l.investorhub.com/auth/signup

Glossary of Terms

The following is a glossary of technical terms:

"Ag"	means	Silver
"Au"	means	Gold
"Breccia"	means	a rock consisting of angular fragments of rock cemented by finer materials
"Cu"	means	Copper
"Ferruginous"	means	containing iron oxides
"Float sample"	means	loose pieces of rock that are not connected to an outcrop
"g/t"	means	grams per tonne
"Hercynian or Variscan Orogeny"	means	an orogenic belt that evolved during the Devonian and Carboniferous periods, from about 419 to 299 million years ago
"km"	means	Kilometres
"m"	means	Metres
"mm"	means	Millimetres
"Mt"	means	millions of tonnes
"NI 43-01"	means	National Instrument 43-101 Standards of Disclosure of Mineral Projects of the Canadian Securities Administrators
"Outcrop"	means	a rock formation that is in situ and visible on the surface
"Qualified Person"	means	a person that has the education, skills and professional credentials to act as a qualified person under NI 43-101
"Sb"	means	Antimony is used in alloys and in lead-acid storage batteries. The U.S. government has considered antimony a critical mineral mainly because of its use in military applications.
"Stratiform"	means	parallel to the bedding planes of the surrounding rock
"Vein"	means	a distinct sheetlike body of crystallised minerals within a rock
"Zn"	means	Zinc

[1] Source: Managem Group - Bouskour project (managemgroup.com).

2 Source: Managem Group - Imiter mine (managemgroup.com).

Cleaned text: letterheads, contacts and legal notices removed. View the original announcement ↗ · Company filings. Not investment advice.