Tintina Mines completes drilling at Domeyko

An anonymous director reports TINTINA MINES COMPLETES DRILLING CAMPAIGN AND REPORTS KEY GEOMETALLURGICAL ADVANCES TO SUPPORT 2025 PEA FOR DOMEYKO SULFUROS PROJECT Tintina Mines Ltd. has completed its 2025 drilling campaign at the Domeyko Sulfuros project, located in the Atacama region, Chile. The primary objective of the campaign was to upgrade the inferred resources reported in January, 2025, National Instrument 43-101, and to support the development of a preliminary economic assessment (PEA) in accordance with NI 43-101 standards, reinforcing the company's commitment to the technical and strategic development of this asset. Preliminary drill results confirm the resource and demonstrate the potential to expand the deposit both to the northwest and at depth. Geometallurgical tests conducted during this phase indicate good copper liberation, low pyrite association and favourable metallurgical recoveries, validating the technical potential of the ore under operating conditions. Drilling campaign The 2025 Domeyko Sulfuros drilling campaign included 12 diamond drill holes, totalling 5,810 metres. This campaign provided key information for updating the 3-D geological models, as well as collecting geotechnical data and core samples for geomechanical testing. The updated resource estimate is expected in September, while complete Cu-Au (copper-gold) assay results will be available by the end of August. Currently, 20 per cent of the geochemical results have been received. Some of the main intercepts in quartz-diorite porphyry are shown in Table 1. Geometallurgical test results Mineralogical results confirmed that chalcopyrite (Cpy) is the primary copper-bearing mineral, with high liberation and low association with pyrite (Py), while gold occurs mainly as native gold and electrum, with fine particles (less than 20 micron) associated with sulphides. Comminution tests indicated low ore abrasiveness (low Ai), medium to hard hardness in primary grinding (SMC, SPI), and soft to medium hardness in secondary grinding (BWi), supporting the design of a conventional grinding circuit. In rougher flotation, five-stage kinetic tests yielded average recoveries of 92.6 per cent Cu and 74.9 per cent Au at P80 equals 150 micron. No significant differences were observed between seawater and freshwater use. Preliminary economic assessment (PEA) For PEA development, Andean Belt Resources engaged SRK Consulting, a firm with extensive experience in mining and economic studies. SRK will be responsible for resource estimation, cost estimation, generation of economic scenarios and sensitivity analysis. Additionally, SRK will provide technical support to Andean Belt Resources throughout the process, including periodic technical meetings, financial model reviews and guidance on key parameters. This collaborative work will continue until the official delivery of the final report, scheduled for December, 2025. Qualified person The scientific and technical content of this news release has been reviewed and approved by Jose Luis Bello Soto, mining resources and development manager, CEMIN Holding Minero, a geologist with more than 26 years of experience, registered member of the Comision Minera (Chilean Mining Commission), as well a member of the Colegio de Geologos de Chile, a qualified person as defined by National Instrument 43-101 -- Standards of Disclosure for Mineral Projects (NI 43-101). The QP confirms he has visited the project area, has reviewed relevant project information, is responsible for the information contained in this news release and consents to its publication. About Tintina Mines Ltd. Tintina Mines is a Canadian-based company with over two decades of experience in the junior mining sector, focused in the acquisition, exploration and development of base and precious metal properties in South America and Canada. Recently, Tintina expanded its portfolio with the addition of five new projects in Chile, following the acquisition of a majority stake in Andean Belt Resources. Tintina is committed to advancing the exploration and development of the copper-gold (Cu-Au) Domeyko Sulfuros project in the Atacama region of northern Chile. Tintina Mines' common shares are listed on the TSX Venture Exchange under the symbol TTS. We seek Safe Harbor.