Andina Copper Corp. has reported the discovery of a new porphyry copper system at the Piuquenes North target, as confirmed by diamond drill holes PIU12 and PIU13. These holes, the first to test a large, deep-seated low resistivity Magnetotelluric (MT) geophysical anomaly, were completed to depths of 992.60m and 1,235m, respectively. Both holes intersected multiple intrusive phases associated with porphyry-style copper sulphide mineralization within a newly identified intrusive complex.
Highlights from the drilling include confirmation of copper sulphide mineralization at depth within the approximately 800m by 700m MT anomaly. Hole PIU13 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. 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 porphyry 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, commented: "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 geology of PIU13 reveals three principal lithological domains. From 0 to 665m, andesitic volcanic host rock is locally intruded by porphyry dykes carrying chalcopyrite mineralization. From 665 to 1,045m, pre-mineral and early mineral porphyry intrusive phases are associated with the main zone of copper sulphide mineralization. Below 1,050m to the end of hole, intermineral and late mineral porphyry phases show varying alteration and mineralization. PIU12 intersected andesitic volcanic host rocks over the upper 832m, with pre-mineral porphyry dykes, and from 832m to the end of hole intersected the main body of pre-mineral porphyry with moderate potassic alteration and quartz veinlets carrying pyrite, chalcopyrite and trace bornite.
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. The anomaly remains open to the north and at depth, where additional drilling will be required to further evaluate the extent of the system.
Next steps include integrating assay results with updated geological logging to refine the targeting strategy for follow-up drilling, expected to focus on down-dip and along-strike extensions. The Company's Corporate Presentation is available at Andina Copper Corporate Presentation.
