Admission of Shares

Further to the RNS announcement on 20 November 2025, Great Southern Copper plc (LSE: GSCU), the company focused on copper-gold-silver exploration in Chile, announces the Admission of the 99,640,000 New Shares in the Company to trading on the Main Market of the London Stock Exchange plc, became effective at 8.00am this morning.

The Company has raised £2.5m through a private placing with existing and new investors, resulting in the issue of 99,640,000 new ordinary shares of 1p each, at a subscription price of £0.025 per ordinary share. 67,604,777 of the new ordinary shares were subscribed by a number of financial institutions and high net worth investors, with the balance offered to one of the Company's directors who agreed to direct their issue to the same financial institutions and investors at the same subscription price on Admission.

Total Voting Rights

Following Admission, the total number of issued shares and the total number of voting rights in the Company is 688,739,755. The above figure should be used by shareholders in the Company as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the share capital of the Company under the Financial Conduct Authority's Disclosure Guidance and Transparency Rules.

Capitalised terms used in this announcement have the same meaning as those given to them in the 20 November 2025 RNS announcement unless otherwise defined.