Great Sth Copp Regulatory News (GSCU)

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION AS STIPULATED UNDER THE UK VERSION OF THE MARKET ABUSE REGULATION NO 596/2014 WHICH IS PART OF ENGLISH LAW BY VIRTUE OF THE EUROPEAN (WITHDRAWAL) ACT 2018, AS AMENDED. ON PUBLICATION OF THIS ANNOUNCEMENT VIA A REGULATORY INFORMATION SERVICE, THIS INFORMATION IS CONSIDERED TO BE IN THE PUBLIC DOMAIN.

The following amendment has been made to the 'Application for Admission of Shares Clarification' announcement released on 4 July 2025 at 14:11 under RNS Number 8598P.

The previous version of the announcement had the total number of new Ordinary Shares as 13,324,369, where the correct number is 13,234,369. It also stated that admission of the Ordinary Shares is expected on 7 July 2025, but the correct date is 8 July 2025.

All other details remain unchanged.

The full amended text is shown below.

4 July 2025

Great Southern Copper plc

("GSC" or the "Company")

Application for Admission of Shares (clarification)

Great Southern Copper plc (LSE: GSCU), the Company focused on copper-gold and silver exploration in Chile, clarifies that, further to the announcements on the 25 June and 2 July 2025, it has made application for a total of 13,234,369 new Ordinary Shares in the Company to trading on the main market of the London Stock Exchange plc, which is expected to occur on or around 8.00 a.m. on 8 July 2025.

For clarity, this application comprises:

· 10,416,667 new Ordinary Shares of 1p each in the Company in relation to the exercising of warrants as announced on 25 June 2025;

· 1,418,189 new Ordinary Shares of 1p each in the Company to director, Charles Bond, in lieu of remuneration. 811,240 for the period 1 October 2024 to 31 March 2025 and 606,949 for shares previously issued but not yet admitted in April 2024, as announced on 2 July 2025; and

· 999,649 and 399,864 new Ordinary Shares of 1p each in the Company in relation to the vendors of the Especuralita and Artemisa projects respectively, as announced on 2 July 2025.

Total Voting Rights

Following Admission, the total number of issued shares and the total number of voting rights in the Company will be 573,521,400. 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.

Enquiries:

About Great Southern Copper

Great Southern Copper PLC is a UK-listed mineral exploration company focused on the discovery of copper-gold-silver deposits in Chile. The Company has the option to acquire rights to 100% of two projects in the under-explored coastal belt of Chile that are prospective for large scale copper-gold deposits. Chile is a globally significant mining jurisdiction being the world's largest copper producer and the second-largest producer of lithium.

The two early-stage Cu-Au projects comprise the Especularita and San Lorenzo Projects, both located in the coastal metallogenic belt of Chile which hosts significant copper mines and deposits, including Teck's Carmen de Andacollo copper mine, and boasts excellent access to infrastructure such as roads, power and ports. Significant historical small-scale and artisanal workings for both copper and gold are readily evident in both exploration project areas.

Great Southern Copper is strategically positioned to support the global market for copper - a critical battery metal in the clean energy transition around the world. The Company is actively engaged in exploration and evaluation work programmes targeting both large tonnage, low to medium grade Cu-Au deposits as well as high-grade Cu-Au deposits.

Further information on the Company is available on the Company's website: https://gscplc.com