Andina Copper Corporation (TSX-V: ANDC | FSE: FIR | OTCQB: PMMCF) has reported significant near-surface porphyry copper-molybdenum mineralization from its Cobrasco Project in Choco, Colombia, further expanding the known extent of the system. The company announced results from drillhole CDH008, which intersected 272 meters grading 0.50% copper, 75 ppm molybdenum, and 1.92 g/t silver starting at a depth of just 52 meters downhole. Within this interval, a higher-grade zone of 152 meters returned 0.67% copper, 68 ppm molybdenum, and 1.90 g/t silver from 54 meters depth.
The drillhole was designed to test the northern continuity of the Cobrasco Central mineralized zone, and it successfully confirmed a northwest extension of the system. CDH008 was drilled due north from the same platform as previous holes CDH006 and CDH007, which had already intersected broad intervals of shallow mineralization, including a 486-meter intercept in CDH006. The new results indicate that the mineralized footprint now extends approximately 1,100 meters along strike and 550 meters laterally, with the system remaining open in all directions.
Two additional step-out drillholes, CDH009 and CDH010, have been completed from the same drill pad, targeting northwest and west-southwest extensions, respectively. Visual logging of both holes has identified sulphide mineralization consistent with the broader Cobrasco Central system, and assays are pending. The company plans further large step-out holes to test northern and northwest extensions, with preparations underway to mobilize a second diamond drilling rig for definition drilling of Cobrasco Central and new porphyry centers.
“We continue to systematically advance a wide-spaced scout drilling programme, actively testing the limits of the Cobrasco system with wide fans of significant step-out drillholes,” said President and CEO Joseph van den Elsen. “The system continues to grow with each successive drillhole, with the mineralization footprint already covering an area of ~1,100m x 550m, and results from CDH009 and CDH010 expected to further extend. Surface geochemistry and field observations strongly suggest that the mineralization continues to the north and northwest and indeed remains open in all directions.”
Geologically, CDH008 intersected a leached cap with intense supergene alteration above a zone of incipient secondary copper enrichment. The strongest mineralization is associated with potassic and sericite-altered magmatic-hydrothermal breccias related to intermineral rhyolite porphyry intrusions. Higher copper and molybdenum grades are consistently linked to these breccia phases, where chalcopyrite occurs as matrix infill and cross-cutting veinlets. Bornite was locally observed, rimming chalcopyrite, suggesting a later higher-sulphidation event.
The Cobrasco Project is part of Andina Copper’s portfolio of discoveries along the Andean porphyry belt in South America. The company also holds interests in Argentina and Chile. For more information, Andina Copper’s corporate presentation is available at Andina Copper Corporate Presentation.
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