Andina Copper Corp. has announced the discovery of a new porphyry copper system at its Piuquenes North target in San Juan Province, Argentina, marking a significant milestone for the project. The company reported that diamond drill holes PIU12 and PIU13, the first two holes designed to test a large, deep-seated low resistivity Magnetotelluric (MT) geophysical anomaly, both intersected multiple intrusive phases associated with porphyry-style copper sulphide mineralization within a newly identified intrusive complex.
The results confirm the presence 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. This interval is hosted within an early mineral porphyry phase and contains chalcopyrite and bornite 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.
Joseph van den Elsen, President and CEO of Andina Copper, said: “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.
Assay results for both PIU12 and PIU13 are pending. Upon receipt, Andina Copper will integrate the assay results with updated geological logging into an updated geological model for Piuquenes North. This 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 discovery underscores the significant exploration potential of Andina Copper's 2,500-hectare land package in San Juan Province. The company also holds interests in the Cobrasco Project in Colombia and a copper-gold target in Chile. Andina Copper is listed on the TSX Venture Exchange (TSXV:ANDC), Frankfurt (FSE: FIR), and OTC (OTCQB: PMMCF).
For more information, the company's corporate presentation is available at Andina Copper Corporate Presentation.
