Aldebaran files NI 43-101 report; JV option terminated

Mr. John Black reports ALDEBARAN FILES PEA ON SEDAR+ AND ANNOUNCES TERMINATION OF THE OPTION AGREEMENT WITH NUTON HOLDINGS LTD. Aldebaran Resources Inc. has filed on SEDAR+ an updated technical report and preliminary economic assessment (the Altar PEA) on the Altar copper-gold project located in San Juan province, Argentina, prepared in accordance with National Instrument 43-101 -- Standards of Disclosure in Mineral Projects. The Altar PEA has an effective date of Sept. 1, 2025, and was created by SRK Consulting Inc. as lead consultants with Knight Piesold as a subcontractor. The report titled "Preliminary Economic Assessment, Altar Project, San Juan, Argentina" has been filed on the SEDAR+ website and will be posted on the company's website. Additionally, the company announces that Nuton Holdings Ltd., a Rio Tinto venture (Nuton), has provided notice of termination of the option to joint venture agreement announced on Nov. 7, 2024, under which Nuton had the right to acquire a 20-per-cent interest in the Altar project. Nuton's decision comes as they are shifting priorities to focus on later-stage projects that could potentially deliver nearer-term production. Despite the termination, Nuton and Aldebaran could still enter a licensing agreement to deploy the Nuton technology, proprietary bio-leaching technology, at Altar. John Black, chief executive officer and director of Aldebaran, commented: "The PEA demonstrated that the base case concentrator scenario for Altar is a long-life project delivering significant copper, gold, and silver production at attractive cash costs while minimizing upfront capital. With an NPV (8 per cent) of $2-billion (U.S.) and an IRR of 20.5 per cent, we believe that Altar is an attractive large-scale copper gold project and a very important project for Argentina moving forward. We thank Nuton for their participation in the Altar project and understand that their shift in priorities made continuing with the Altar option agreement challenging. We retain an 80-per-cent interest in the project and look forward to advancing it towards a prefeasibility study with our joint venture partner Sibanye-Stillwater." Qualified person The scientific and technical data contained in this news release has been reviewed and approved by Dr. Kevin B. Heather, BSc (honours), MSc, PhD, FAusIMM, FGS, chief geological officer and director of Aldebaran, who serves as the qualified person (QP) under the definitions of National Instrument 43-101. About Aldebaran Resources Inc. Aldebaran is a mineral exploration company that was spun out of Regulus Resources Inc. in 2018 and has the same core management team. Aldebaran holds an 80-per-cent interest in the Altar copper-gold project in San Juan province, Argentina. The Altar project hosts multiple porphyry copper-gold deposits with potential for additional discoveries. Altar forms part of a cluster of world-class porphyry copper deposits which includes Los Pelambres (Antofagasta Minerals), El Pachon (Glencore) and Los Azules (McEwen Copper). In November, 2024, the company announced an updated mineral resource estimate for Altar, prepared by Independent Mining Consultants Inc. and based on the drilling completed up to and including the 2023 to 2024 field season (independent technical report prepared by Independent Mining Consultants Inc., Tucson, Arizona, titled "Technical Report, Estimated Mineral Resources, Altar Project, San Juan Province, Argentina," dated Dec. 31, 2024 -- see news release dated Nov. 25, 2024). We seek Safe Harbor.