Annual Report for the Year Ended 30 September 2025

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Tertiary Minerals plc has published its Annual Report for the year ended 30 September 2025 and the Notice of its 2026 Annual General Meeting, which will be held on Thursday 19 March 2025 at 10:00 a.m. at Mottram Hall. The report and notice are available on the company's website, and registered shareholders are being notified via letter or email. Proxy voting instructions are detailed on pages 61 and 62 of the Annual Report, with proxy voting available from 5:00 p.m. today.

Disclaimer*

Tertiary Minerals PLC

20 February 2026

Tertiary Minerals plc

("Tertiary" or the "Company")

Annual Report for the Year Ended 30 September 2025

Tertiary Minerals plc (AIM: TYM) is pleased to advise that the full version of the Annual Report, for the year ended 30 September 2025 and the Notice of the 2026 Annual General Meeting ("AGM") has now been published on the Company's website at:

https://www.tertiaryminerals.com/shareholder-documents

A letter or email, depending on individual preference, is being sent to registered shareholders today to notify them of the publication of the Annual Report and Notice.

The AGM has been convened for 10.00 a.m. on Thursday 19 March 2025 at Mottram Hall, Wilmslow Road, Mottram, Cheshire SK10 4QT.

Proxy Voting will be available from 5.00 p.m. today and instructions can be found on pages 61 and 62 of the Annual Report at the link above.

For more information please contact:

Further Information:

Tertiary Minerals plc
Richard Belcher, Managing Director	+44 (0) 1625 838 679
SP Angel Corporate Finance LLP, Nominated Adviser and Broker
Richard Morrison/Jen Clarke	+44 (0) 203 470 0470
AlbR Capital Limited, Joint Broker
Lucy Williams/Duncan Vasey	+44 (0) 207 469 0930

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