Exercise of Warrants

Great Southern Copper plc (LSE: GSCU), the company focused on copper-gold-silver exploration in Chile, are delighted to announce that its largest shareholder, Foreign Dimensions Pty Limited ("Foreign Dimensions"), has partially exercised its warrant rights to subscribe for 25,083,328 new ordinary shares of 1p each in the capital of the Company ("Ordinary Shares") at an exercise price of 2.4p per share for gross proceeds of £602,000. Foreign Dimensions has been a long-time supporter of the Company, and this additional funding will enable GSC to further its exploration programmes in Chile.

Admission to Trading and Total Voting Rights

Application for admission has been made and the admission of these 25,083,328 new Ordinary Shares to trading on the Main Market of the London Stock Exchange plc, which is expected to become effective on or around 8.00am on 17 April 2026 ("Admission").

Following Admission, the total number of issued shares and the total number of voting rights in the Company will be 741,334,611. This 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.