Andina Copper Discovers New Copper-Gold Porphyry System at Piuquenes North in Argentina

Andina Copper Corporation (TSX-V: ANDC | FSE: FIR | OTCQB: PMMCF) has announced assay results from its first two diamond drill holes at the newly generated Piuquenes North target in San Juan, Argentina, confirming a new copper-gold porphyry discovery. The results, released today, mark a significant step in the company’s exploration of the San Juan Miocene belt, a region known for major copper deposits.

Drillhole PIU13 returned 468 meters grading 0.50% copper, 0.30 g/t gold, and 3.04 g/t silver from 700 meters downhole, including a higher-grade interval of 164 meters at 0.70% copper, 0.44 g/t gold, and 4.19 g/t silver from 924 meters. The mineralization is hosted within a multiphase porphyry system characterized by intense quartz vein stockwork and potassic alteration, with chalcopyrite and bornite as the primary copper minerals. The company noted that gold is a significant co-product, with lesser silver.

Drillhole PIU12, collared approximately 600 meters east-northeast of PIU13, intersected shorter intervals of mineralization and is interpreted to be on the periphery of the system. This hole returned 14 meters at 0.38% copper, 0.12 g/t gold, and 1.81 g/t silver from 864 meters. These results confirm that the porphyry system extends laterally at Piuquenes North.

The discovery is particularly noteworthy because the two drill holes tested only a small part of the targeted magneto-telluric (MT) geophysical anomaly, which measures approximately 800 meters by 700 meters and remains open in all directions. The anomaly, delineated in the company’s 2026 geophysical survey, corresponds to the mineralized system intersected in PIU13. ‘We are extremely pleased with the results received from our first drillholes at Piuquenes North,’ said Joseph van den Elsen, President and CEO of Andina Copper. ‘High-grade Cu-Au values from PIU13 confirm a new discovery, proximate to the high-grade, near surface Cu-Au mineralization at Piuquenes Central.’

The Piuquenes project now comprises three recognized porphyry systems: the newly discovered Piuquenes North, along with the previously identified Piuquenes Central and Piuquenes East. All three lie immediately adjacent to the north of Aldebaran Resources Inc.’s Altar copper-gold porphyry project. The region is part of the Miocene porphyry belt of San Juan Province, which hosts other significant deposits including El Pachon (Glencore) approximately 30 kilometers to the south, the operating Los Pelambres copper mine (60% Antofagasta plc) in Chile, and Los Azules (McEwen Copper) about 50 kilometers to the northeast.

Andina Copper plans to integrate the assay results with geological data to refine its three-dimensional model for Piuquenes North and design a follow-up drill program. The next phase will prioritize testing the north-northeast continuation and untested depth extent of the MT anomaly. The company also intends to conduct measurements of resistivity and chargeability on representative core to refine geophysical interpretations.

The company’s corporate presentation is available at Andina Copper Corporate Presentation. For the latest news and releases, visit the company’s mailing list or follow on LinkedIn and X. Gustavo Zulliger, a consultant of Andina Copper and a qualified person under NI 43-101, has reviewed and approved the technical information in this release.

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