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.

7 December 2023

Great Southern Copper plc

("GSC" or the "Company")

Publication of Prospectus

Further to the announcement on 23 November 2023 of a conditional placing and subscription of 40,222,206 new ordinary shares of 1p each at £0.0225 per share, Great Southern Copper plc (LSE: GSCU), the company focused on copper-gold and lithium exploration in Chile is pleased to announce that the Financial Conduct Authority ("FCA") has approved the Company's prospectus dated 7 December 2023 ("Prospectus") issued in connection with the application for  admission of 88,102,802 new ordinary shares of 1p each to listing on the standard listing segment of the Official List of the FCA and to trading on the Main Market of the London Stock Exchange ("Admission").

It is expected that Admission will become effective 8.00 a.m. on 14 December 2023.

The Prospectus has been published in electronic form and is available from today on the Company's website (www.gscplc.com) and will be submitted shortly to the National Storage Mechanism.

Enquiries:

About Great Southern Copper

Great Southern Copper PLC is a UK-listed mineral exploration company focused on the discovery of copper-gold and lithium 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. In addition, the Company has the option to acquire rights to 100% of a lithium project located in the Salar de Atacama district of Chile. 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 San Lorenzo and Especularita 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.

The Company's Monti Lithium project is strategically located in the pre-Andean region of Salar de Atacama which is Chile's premier lithium-producing region with well-established lithium mining operations and infrastructure.

Great Southern Copper is strategically positioned to support the global market for copper and lithium - both critical battery metals 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 and Li deposits as well as high-grade Cu-Au deposits.

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