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20 November 2025

Great Southern Copper plc

("GSC" or the "Company")

GSC secures £2.5million equity funding to expand exploration in Chile

Great Southern Copper plc (LSE: GSCU), the company focused on copper-gold-silver exploration in Chile, is pleased to announce that it has raised £2.5million to finance its ongoing exploration programmes at the Especularita Project in Chile, through a placing of new equity (the "Fundraising").

The Fundraising comprises:

£2.5million raised through a private placing with existing and new investors ("Placing"), resulting in the issue of 99.640 million new ordinary shares of 1 pence each ("New Shares") at a placing price of 2.5 pence, being a 10 per cent. discount to the Company's volume weighted average share price over the previous 20 trading days. The New Shares represent approximately 16 per cent of the Company's current issued share capital. The Placing is conditional on admission of the New Shares to listing on the Equity shares (transition) category of the Official List of the Financial Conduct Authority and to trading on the Main Market of London Stock Exchange plc becoming effective ("Admission"). Each share will have half a warrant, exercisable at £0.045 for a period of 24 months from the date of Admission to trading of the Placing shares

Rationale for Fundraising and Use of Proceeds

The last 12 months has seen significant progress for the Company with its discovery of a high grade copper-silver target at Mostaza, within the Cerro Negro prospect.  In addition, the team in Chile has identified a number of highly prospective targets across its concessions, including a gold porphyry target at Viuda and copper porphyry targets associated with the Colorada lithocap.   

This funding, being the largest raise by the Company since its admission to listing in December 2021, is required to enable the expansion of these exploration programmes on those targets which the Board considers to be the most prospective.

Sam Garrett, Chief Executive Officer of Great Southern Copper plc, said: "This raise is a major milestone for Great Southern Copper, highlighting both new institutional and long-term shareholder support for the Company's exploration strategy and rewarding our successes with the drill bit this year. This is a real show of confidence in the direction of the company, its project's and the management team.

"The Company currently has three drill rigs in operation at the Cerro Negro prospect carrying out our Phase III exploration drilling programme, and we look forward to updating the market on the results here. This new funding allows Great Southern Copper to advance  its exploration efforts at Especularita, focusing on our high-grade copper-silver discovery at Mostaza. In addition, the funds will be used to expand its exploration and drilling programmes at Viuda, targeting porphyry gold mineralisation as well as testing new prospects across the wider project area.

"We greatly appreciate the on-going backing of our long-term holders and welcome the support shown by our new investors."

Admission and Total Voting Rights

Application will be made for Admission of the New Shares, which will rank pari passu in all respects with the existing ordinary shares in the Company, which is expected to occur at 8.00 a.m. on or around 1 December 2025.

Following Admission of the New Shares, the total number of ordinary shares and voting rights in the Company will be 688,739,755.  This figure may 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 FCA's Disclosure and Transparency Rules.

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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 mining rights to 100% of Especularita project in the under-explored coastal belt of Chile that is prospective for large scale copper-gold-silver deposits. Chile is a globally significant mining jurisdiction being the world's largest producer and exporter of copper.

The Especularita Project is 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 the exploration project area. The coastal belt offers deposit type optionality for copper including porphyry and IOCG style deposits as well as newly recognised intrusive-related copper and gold deposits.

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 as well as high-grade Cu-Ag-Au deposits. Further information on the Company is available on the Company's website: https://gscplc.com