Andina Copper Confirms New Porphyry Copper System at Piuquenes North in Argentina

Andina Copper Corp. has confirmed the discovery of a new porphyry copper system at its Piuquenes North target in San Juan Province, Argentina, after completing two diamond drill holes that intersected extensive copper sulphide mineralization. The results, announced May 28, 2026, represent a significant milestone for the company and highlight the growing exploration potential of its 2,500-hectare land package in the prolific Andean copper belt.

Drill holes PIU12 and PIU13, which reached depths of 992.60 meters and 1,235 meters respectively, were designed to test a large, deep-seated low-resistivity Magnetotelluric (MT) geophysical anomaly identified earlier this year. Both holes successfully encountered multiple intrusive phases associated with porphyry-style copper sulphide mineralization, including chalcopyrite and bornite, within a newly identified intrusive complex. The strongest visible mineralization in PIU13 occurred between 848 and 1,045 meters downhole, hosted within an early mineral porphyry phase exhibiting potassic alteration and abundant quartz veins.

Joseph van den Elsen, President and CEO of Andina Copper, stated: “During the 2025/26 San Juan field season we continued to define and expand the recently discovered Piuquenes East copper-gold porphyry centre, while also testing a compelling undrilled MT geophysical target at Piuquenes North. Both drill holes completed at Piuquenes North intersected a multiphase porphyry copper system, with the MT anomaly remaining open to the north and at depth. Confirmation of a third mineralized porphyry system at Piuquenes North marks an important milestone for the project and further demonstrates the significant exploration potential of the Piuquenes property.”

The company noted that the observed sulphide content, particularly bornite and chalcopyrite, correlates strongly with the MT anomaly, validating the geophysical targeting method. The anomaly remains open in multiple directions, suggesting the system could be larger than currently defined. Andina Copper plans to conduct additional laboratory resistivity and chargeability measurements on core samples to refine the geophysical interpretation and guide follow-up drilling aimed at expanding the system down-dip and along-strike.

Assay results for both holes are pending, but visual logging has already revealed robust alteration and mineralization patterns typical of significant porphyry copper systems. The company emphasized that all technical information is based on visual core logging and should not be construed as grade estimates. Upon receipt of assays, Andina Copper will integrate the data with geological logging to update the geological model for Piuquenes North and refine targeting for the next drilling phase.

This discovery adds to the company’s portfolio of assets along the Andean porphyry belt, which also includes the Cobrasco Project in Colombia and a target in Chile. The Piuquenes property now hosts three mineralized porphyry systems: Piuquenes Central, Piuquenes East, and the newly confirmed Piuquenes North. The company’s systematic evaluation of its land package underscores the region’s potential for hosting large-scale copper deposits, which are critical for meeting global demand for the metal used in electrification and renewable energy infrastructure.

Interested parties can view the company’s corporate presentation at Andina Copper Corporate Presentation and follow updates via their mailing list and social media channels.

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