Andina Copper samples up to 9.43% Cu at Mantau project

Executive Summary

• Andina Copper Corp. reported high-grade copper and gold results from initial rock-chip sampling at its Mantau project in the Antofagasta region of Chile, validating historical data and expanding the known mineralized footprint.
• The sampling program identified significant intercepts, including up to 9.43% Cu and 2.2 g/t Au, confirming the presence of IOCG and stratabound Manto-style mineralization.
• The company has completed a drone-based photogrammetry survey and soil sampling orientation, with plans to initiate a follow-up exploration program involving grid-based soil sampling and geophysical surveys to define drill targets.

Key Details

• Sample Results (Rock-Chip):
  • Sample 16680: 9.43% Cu and 0.21 g/t Au (located in fault zone).
  • Sample 16731: 9.32% Cu and 0.40 g/t Au (Cu-oxide in caliche).
  • Sample 16676: 5.81% Cu and 2.20 g/t Au (50 cm fault zone).
  • Sample 16690: 1.73% Cu and 0.14 g/t Au.
  • Sample 16666: 1.50% Cu.
  • Sample 16683: 0.66% Cu.
  • Sample 16687: 0.57% Cu.
  • Additional gold assays: 0.14 g/t Au, 0.13 g/t Au, and 0.11 g/t Au.
• Historical Context:
  • Previous work by Rugby Resources returned values up to 28.6% Cu, 5.91 g/t Au, 69 ppm Mo, and 15% Fe.
  • Andina collected 70 rock samples; five returned >1% Cu and eight returned >0.1 g/t Au.
• Geological Setting:
  • Mantau is a 4,500-hectare tenement in the low-altitude Coastal Cordillera.
  • Hosts five main lithologies, including Jurassic La Negra formation volcanic units intruded by felsic stocks.
  • Located immediately west of the Atacama fault zone within a prospective IOCG corridor.
  • Identified features include red hematite alteration, stockwork veining, and quartz-magnetite breccias.
  • Mineralization is primarily localized along the Falla Este fault zone, interpreted as a major fluid conduit.
• Exploration Activities:
  • Completed initial geological review, mapping, and reconnaissance rock-chip sampling.
  • Conducted drone-based photogrammetry to produce a high-resolution digital elevation model (DEM).
  • Completed an orientation survey for soil sampling techniques suitable for weathered terrains.
• Next Steps:
  • Implement systematic, grid-based soil geochemical programs to define multielement trends.
  • Conduct ground or drone-based magnetic surveys.
  • Perform advanced geophysical surveys including MobileMT (magnetotellurics) and Vector IP/resistivity and Tensor MT.
  • Use integrated data sets to guide drill-target definition.
• Project Context:
  • Mantau is located near significant deposits including Marimaca Copper's MOD deposit (200 Mt at 0.45% Cu) and Antofagasta PLC's Cachorro discovery (300 Mt at 1% Cu, 4 g/t Ag).
  • Potential for IOCG and stratabound Manto-style mineralization similar to Marimaca's Pampa Medina discovery.

Notable Quotes

• Joseph van den Elsen, President and CEO: "We are very pleased to have validated historical high-grade Cu and Au results and to have significantly expanded the area of interest at our Mantau project. Such high-grade copper and gold assays in rock samples from a poorly explored, undrilled area close to significant recent copper discoveries highlight the projects strong prospectivity."
• Joseph van den Elsen, President and CEO: "This is an exciting time to be an Andina shareholder as field programs move into full swing across all three of our projects. The 2025 to 2026 field season is underway at Piuquenes and exploration is continuing at pace at Cobrasco."