Announcement PDF 23 October 2026 CASTLE MINERALS BECOMES TERRANOVA METALS New name and ASX ticker TNM effective from market open on Monday, 26 October 2026 Castle Minerals Limited (ASX: CDT) (“Castle” or “the Company”) advises that, following shareholder approval and registration with ASIC, the Company has changed its name to TerraNova Metals Ltd and will commence trading on the Australian Securities Exchange under the ticker ASX: TNM from market open on Monday, 26 October 2026. Introducing TerraNova Metals Ltd TerraNova Metals marks a new chapter for the Company as it continues to refine its exploration portfolio and pursue opportunities across prospective gold regions in West Africa and Western Australia. Over recent months, the Company has continued to reshape and strengthen its portfolio, including advancing the proposed acquisition of the Nielle Gold Project in Côte d'Ivoire and consolidating its substantial Meeka South Gold Project landholding in Western Australia's Murchison region. The refreshed corporate identity reflects the Company's evolving portfolio and provides a clear platform for pursuing its exploration strategy. Under its new name, TerraNova Metals will continue to focus on evaluating and advancingprospectivemineral assets,prioritisingexploration opportunities and pursuing long-term value creation for shareholders. The Company has also launched its new corporate website, providing investors and stakeholders with a dedicated platform for Company information, project updates and ASX announcements. Visit the new website: www.terranovametals.com Investors are encouraged to visit the website for Company information, project updates, ASX announcements and future developments. Trading Information The Company's transition to its new corporate identity will take effect as follows: • New company name: TerraNova Metals Ltd • Former company name: Castle Minerals Limited • New ASX ticker: TNM • Former ASX ticker: CDT • First day of trading under new name and ticker: Monday, 26 October 2026 • Website: www.terranovametals.com Thechange of name and ASX ticker does not affect theCompany'sAustralian Company Number(ACN),issued share capital or the rights attaching to its securities. Shareholders do not need to take any action in connection with the change of name or ticker. Steve Zaninovich, Managing Director of TerraNova Metals, commented: “TerraNova Metals represents an important milestone in the evolution of our Company. Our portfolio has continued to develop, and we are sharpening our focus on advancing exploration opportunities in Côte d'Ivoire and Western Australia. “Our new name reflects the business we are building and provides a clear identity for the next phase of our strategy. With the proposed Nielle Gold Project acquisition and our expanded Meeka South landholding, we have a broader platform from which to evaluate and pursue exploration opportunities. “Our focus remains on disciplined exploration, responsible capital allocation and identifying opportunities to create long-term value for shareholders. We look forward to beginning this next chapter as TerraNova Metals.” - END - This announcement has been authorised for release to the ASX by the Board of TerraNova Metals Ltd. For further information please contact: Steve Zaninovich Managing Director enquiries@terranovametals.com About TerraNova Metals TerraNova Metals Ltd (ASX: TNM), formerly Castle Minerals Limited (ASX: CDT),isa West African–focused gold explorer with tenure positions in Côte d’Ivoire and Western Australia, two of the world’s premier gold- producing regions. Shareholders approved the change of the Company’s name at the General Meeting held on 19 October 2026. In Côte d’Ivoire, TerraNova is contracted to earn interests in eight permits (one granted, seven under application), including the flagship Nielle Gold Project in the north. The remaining “CDI East” permits sit along the Côte d’Ivoire–Ghana border. All are located on fertile Birimian greenstone belts that host numerous multimillion-ounce gold deposits across West Africa. In Western Australia, TerraNova holds a dominant, contiguous ~184km² landholding in the Murchison Gold District,aprovenprovincehostingmultipleoperatingand past-producingmines.Its MeekaSouthGold Project carries a clear infrastructure advantage, sitting close to the Bluebird Gold Processing Mill (Westgold) and Meeka Metals’ Murchison Gold Project, with geology comparable to established regional producers. Figure 1: TerraNova Metals tenement package in Côte d’Ivoire Figure 2: TerraNova Metals Meeka South tenement package in Western Australia