Anglesey Mining Plc - Completion of Preliminary Geospatial Exploration

                          Four areas of interest identified, suggesting further investigation is highly
justified

21 September 2026

Anglesey Mining plc

("Anglesey"or the"Company")

Completion of Preliminary Geospatial Exploration

Four areas of interest identified, suggesting further investigation is highly
justified

Anglesey Mining plc (AIM: AYM), the UK-based mineral exploration and development
company advancing the UK's largest polymetallic Volcanic Massive Sulphide
("VMS") project at the 100% owned Parys Mountain Cu-Zn-Pb-Ag-Au VMS deposit in
North Wales, announces the receipt of results for the exploratory geospatial
analysis project from Satellite Applications Catapult ("Catapult") and the
British Geological Survey ("BGS").

Highlights:

  · Application of satellite-based technology and other modern datasets to
prospective areas in and around the environment of Parys Mountain.
  · Four target areas, in conjunction with our aero-geophysical programme, were
identified for follow-up exploration.
  · Earth observation work integrated with geological interpretations and modern
geophysical datasets by the BGS, specifically in relation to VMS mineral
systems.

As announced on 26 May 2026 (https://www.londonstockexchange.com/news
-article/AYM/operational-update/17607334), the Company engaged Catapult to
provide a preliminary geospatial analysis study as an exploration method for
identifying potential VMS extensions in and around the Parys Mountain region.

Catapult, a UK Research & Innovation provider of remote sensing and geospatial
services, worked with the BGS, drawing on its extensive deposit-type and earth
observation expertise, to produce an integrated analysis of Light Detection and
Ranging ("LiDAR"), spectral and geophysical datasets. These non-intrusive
methods were used to provide more rapid and less costly indications of
subsurface geology and assess the potential for additional exploration targets.

The BGS identified four areas of interest where combinations of geological,
geophysical and Earth observation datasets further justify additional
exploration. The highlighted areas broadly align, as expected, with those
already identified in the Company's ongoing technical reviews, providing
additional data to support the analysis and further de-risk costly exploration
at Parys Mountain.

See a summary visual presentation from Catapult at: Earth Observation For
Minerals (https://storymaps.arcgis.com/stories/3cb1190bd7574bfa95d3f8ca6a91d2ff)

Qualified Person

Eur. Ing. Jim Williams, BSc, MSc, D.I.C., FIMMM, CEng., CGeol., the Executive
Chairman of Anglesey Mining, a "Qualified Person" as defined in the AIM
guidelines of the London Stock Exchange, and a "Qualified Person" as defined in
the Canadian National Instrument 43-101 ("NI 43-101"), has reviewed and approved
the information in this release.

For further information, please visit the Company's
website:www.angleseymining.co.uk

-Ends-

For further information, please contact:

Anglesey Mining plc (via Yellow Jersey PR Limited)

Jim Williams, Executive Chairman

Andrew Fulton, CEO

angleseymining@yellowjerseypr.com

Davy

Nominated Adviser & Joint Corporate Broker

Brian Garrahy/Daragh O'Reilly

Tel: +353 1 679 6363

AlbR Capital Limited

Joint Corporate Broker

Lucy Williams/Duncan Vasey

Tel: + 44 (0)20 7562 0930

Yellow Jersey PR Limited

Financial & Media Relations

Dominic Barretto/Shivantha Thambirajah

Tel: +44 (0)20 3004 9512

About Anglesey Mining plc:

Anglesey is advancing the UK's largest polymetallic VMS project at the 100%
owned Parys Mountain Cu-Zn-Pb-Ag-Au VMS deposit in North Wales.


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