Launch of Investor Website

9 February 2026

Great Southern Copper plc

("GSC" or the "Company")

Launch of Investor Website

Great Southern Copper plc (LSE: GSCU), the company focused on copper-gold-silver exploration in Chile, is pleased to announce the launch of its interactive investor hub. For both existing and prospective shareholders, the new investor hub brings all GSC content into a single integrated platform to better inform and engage with investors and stakeholders, including:

· Regulatory announcements

· Reports

· Presentations

· Educational material

· Interviews

· Corporate research

The investor hub also provides an interactive online experience allowing GSC's stakeholders to comment on and ask the GSC team questions via a portal which will be monitored and responded to in a timely manner and when it is deemed appropriate to do so.

How to sign up for the GSC investor hub:

1. Visit https://gscplc.com/

2. Follow the prompts to sign up for an investor hub account

3. Complete your account profile

Sam Garrett, Chief Executive Officer, commented:

"Clear and consistent communication with shareholders is a priority for GSC. The investor hub provides an additional channel through which investors can access company updates and better understand our strategy and activities.

"The platform will host a range of video content and information relating to our projects and future plans, and will support ongoing engagement with both existing and prospective shareholders as we continue to develop our communications approach."

Engage with the GSC management team directly by asking questions, watching video
summaries and seeing what other shareholders have to say. Navigate to our Interactive Investor
hub here: https://gscplc.com/

Enquiries:

Subscribe to our news alert service: https://gscplc.com/auth/signup

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