Investor Presentation via Investor Meet Company

("Tertiary" or the "Company")

20 April 2026

Investor Presentation via Investor Meet Company

Tertiary Minerals plc (AIM: TYM), the London listed explorer focused on copper and precious metals in Zambia and Nevada, USA, announces it will be presenting, via the Investor Meet Company platform, at 12:30 (BST) on Thursday, 23 April 2026.

The live presentation by Dr Richard Belcher (Managing Director) will provide an update on the Company's flagship project, the Mushima North Silver-Copper Project in Zambia, following the recent announcement of a JORC-compliant Exploration Target range of 15-30 million tonnes (Mt) at 40-60 grams per tonne (g/t) silver equivalent.

The presentation is open to all existing shareholders and potential investors. Questions can be submitted pre-event via the Investor Meet Company dashboard up until 09:00 (BST) on 22 April 2026, or at any time during the live presentation.

Investors can sign up to Investor Meet Company for free and add to meet Tertiary Minerals plc via: https://www.investormeetcompany.com/tertiary-minerals-plc/register-investor

Investors who already follow the Company on the Investor Meet Company platform will automatically be invited.

Further Information: