Andina Copper Corp. has announced the discovery of a new porphyry copper system at its Piuquenes North target in San Juan Province, Argentina. The company reported that diamond drill holes PIU12 and PIU13, the first two holes testing a large, deep-seated low resistivity Magnetotelluric (MT) geophysical anomaly, have intersected multiple intrusive phases associated with porphyry-style copper sulphide mineralization within a newly identified intrusive complex.
Both holes confirmed the presence of copper sulphide mineralization at depth within the approximately 800m by 700m MT anomaly. Hole PIU13 intersected four porphyry intrusive phases, confirming a well-developed porphyry system. The strongest visible copper sulphide mineralization was observed between 848m and 1,045m downhole, hosted within an early mineral porphyry phase. Copper sulphide minerals, including chalcopyrite and bornite, were logged throughout the early mineralized porphyry, occurring within quartz veins and as disseminations associated with potassic alteration. Hole PIU12 confirmed the lateral extent of the system, intersecting andesitic host rocks intruded by pre-mineral porphyry dykes containing chalcopyrite and minor bornite mineralization. Assay results for both holes are pending.
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 believes the elevated sulphide content observed in drilling is a significant contributing factor to the conductive low-resistivity response defined by the MT survey. The geometry and scale of the mineralized porphyry system demonstrate a strong correlation between the MT anomaly and copper sulphide mineralization at Piuquenes North. The anomaly remains open to the north and at depth, where additional drilling will be required to further evaluate the extent of the system. During the off-season, the company plans to undertake laboratory resistivity and chargeability measurements on representative core samples to further refine the geophysical interpretation.
Upon receipt of assay results, Andina Copper will integrate the data with updated geological logging into an updated geological model for Piuquenes North. The integrated dataset will be used to refine the targeting strategy for follow-up drilling, which is expected to focus on the down-dip and along-strike extensions of the newly intersected porphyry system. The company's corporate presentation is available at Andina Copper Corporate Presentation.
