Tintina Mines completes drilling at Domeyko

Executive Summary

• Tintina Mines completed a 12‑hole, 5,810 m drilling campaign at the Domeyko Sulfuros project to upgrade its inferred resources and support a 2025 PEA.
• Geometallurgical testing shows high copper liberation, low pyrite association, and strong recoveries (≈92.6 % Cu, 74.9 % Au) under both seawater and freshwater conditions.
• Updated NI 43‑101 resource estimate expected September 2026; full Cu‑Au assay results due end of August 2026; final PEA report scheduled for December 2025.

Key Details

• Drilling Campaign: 12 diamond holes, total depth = 5,810 m; data used to refine 3‑D geological model and collect geotechnical/core samples.
• Assay Progress: 20 % of geochemical results received; full Cu‑Au assay suite anticipated by end‑August 2026.
• Key Intercepts: Representative quartz‑diorite porphyry intercepts listed in Table 1 (details not reproduced).
• Geometallurgy – Mineralogy: Chalcopyrite identified as primary copper mineral with high liberation; gold present mainly as native gold/electrum fine particles (<20 µm) associated with sulfides.
• Comminution Tests: Low ore abrasiveness, medium‑to‑hard primary grinding hardness (SMC, SPI), soft‑to‑medium secondary grinding hardness (BWi); supports conventional grinding circuit design.
• Flotation Results: Five‑stage kinetic tests yielded average recoveries of 92.6 % Cu and 74.9 % Au at P80 = 150 µm; no significant performance difference between seawater and freshwater media.
• PEA Development Partner: SRK Consulting engaged to perform resource estimation, cost modeling, economic scenario generation, sensitivity analysis, and technical support through periodic meetings and model reviews.
• PEA Timeline: Final PEA report slated for delivery in December 2025 (subject to data integration).
• Qualified Person: Jose Luis Bello Soto, Mining Resources & Development Manager, CEMIN Holding Minero – NI 43‑101 Qualified Person, reviewed and approved the technical content.

Notable Quotes

(No direct quotes provided in the release.)