Andina Copper Corp. (TSXV:ANDC) has reported that the first two diamond drill holes at its Piuquenes North target, PIU12 and PIU13, successfully intersected multiple intrusive phases associated with porphyry-style copper sulphide mineralization within a newly identified intrusive complex. The holes were designed to test a large, deep-seated low resistivity Magnetotelluric (MT) geophysical anomaly approximately 800m by 700m in size, as previously outlined in the company's February 10, 2026 news release.
Both holes confirmed the presence of copper sulphide mineralization at depth within the targeted MT anomaly. PIU13, drilled to 1,235m, intersected four porphyry intrusive phases, with the strongest visible copper sulphide mineralization observed between 848m and 1,045m downhole, hosted within an early mineral porphyry phase. Mineralization includes chalcopyrite and bornite occurring in quartz veins and as disseminations associated with potassic alteration. Hole PIU12, completed at 992.60m, confirmed the lateral extent of the porphyry system, intersecting andesitic host rocks intruded by pre-mineral porphyry dykes containing chalcopyrite and minor bornite mineralization.
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 intersected by PIU12 and PIU13 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.
Assay results for both holes are pending. Upon receipt, the company will integrate the assay results together with updated geological logging, including lithology, alteration and mineralization, 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.
Drill holes PIU12 and PIU13 were collared using a PQ drill bit and reduced to HQ and subsequently NQ diameter. Core was logged, photographed, and sampled at the company's field camp and processing facility in Barreal, San Juan Province. Samples were dispatched to ALS Minerals in Mendoza, Argentina for preparation and analysis at ALS laboratory in Lima, Peru. The company implemented a QA/QC program including certified reference materials, blanks, and duplicates.
Gustavo Zulliger, a consultant of Andina Copper and a Qualified Person as defined by NI 43-101, has reviewed and approved the technical information in this news release. For further details, the company's corporate presentation is available at Andina Copper Corporate Presentation.
