Andina Copper Reports up to 9.43% Cu and 2.2 g/t Au from Rock-Chip Samples at Mantau, Antofagasta, Chile

Executive Summary

• Andina Copper completed its initial geological review, mapping and rock‑chip sampling at the Mantau Cu‑Au project in northern Chile, confirming historic high‑grade copper–gold anomalies and expanding the known mineralized footprint to >3 km.
• Multiple rock‑chip samples returned exceptionally high grades (e.g., 9.43 % Cu & 0.21 g/t Au; 9.32 % Cu & 0.40 g/t Au; 5.81 % Cu & 2.20 g/t Au), validating prior work that reported up to 28.6 % Cu and 5.91 g/t Au.
• The company announced a follow‑up exploration program that will include grid‑based soil geochemistry, ground/drone magnetic surveys, and advanced IP/MT studies to define drill targets.

Key Details

• Project Overview
• Mantau Cu‑Au project comprises a 4,500 ha tenement in Chile’s Antofagasta region, situated within a low‑altitude Coastal Cordillera corridor hosting several large district‑scale deposits (e.g., Marimaca MOD Deposit, Antofagasta PLC Cachorro discovery).
• Sampling Results
• 70 rock‑chip samples collected; 5 samples > 1 % Cu and 8 samples > 0.1 g/t Au. Notable assays:
  • Sample 16680 – 9.43 % Cu, 0.21 g/t Au
  • Sample 16731 – 9.32 % Cu, 0.40 g/t Au
  • Sample 16676 – 5.81 % Cu, 2.20 g/t Au
  • Sample 16690 – 1.73 % Cu, 0.14 g/t Au
  • Sample 16666 – 1.50 % Cu
• Historical Rugby Resources work previously returned up to 28.6 % Cu and 5.91 g/t Au; Andina’s program validates these high‑grade zones.
• Geological Highlights
• Mapping identified red hematite alteration, stockwork veining, quartz‑magnetite breccias consistent with IOCG mineralization along the Falla Este fault zone.
• Lithologies include Jurassic La Negra Formation volcanic tuffs intruded by felsic stocks; mineralization occurs in rhyolitic units and along structural conduits.
• Technical Work Completed
• Drone‑based photogrammetry produced a high‑resolution DEM for future mapping and geophysical planning.
• Orientation soil‑sampling survey refined techniques suitable for weathered terrains across the concession.
• Planned Exploration Program
• Systematic, grid‑based soil geochemical sampling across the broader Mantau area to delineate multi‑element trends.
• Ground or drone magnetic surveys as the first phase of geophysical work.
• Advanced geophysical techniques (MobileMT, Vector IP/Resistivity, Tensor MT) slated for later phases to generate three‑dimensional subsurface models and guide drill target definition.
• Management Commentary
• President & CEO Joseph van den Elsen emphasized validation of historic high‑grade results, expansion of the area of interest, and readiness to move into a full exploration season (2025‑26) across all projects.

Notable Quotes

“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… Planning is now underway for a follow‑up work program to define drill targets.” – Joseph van den Elsen, President & CEO

All technical information has been reviewed by qualified person Francisco Montes (MAIG #4160) in accordance with NI 43‑101.