Great Southern Copper (GSCU) investor relations material

Project overview and location

• Focus on copper, gold, and silver exploration in Chile, the world's largest copper producer, with 100% foreign ownership allowed and excellent infrastructure for low-cost exploration.

• Especularita project covers a large, under-explored concession in a coastal metallogenic belt, with multiple deposit types (PCD, IOCG, IRCG) and a pipeline of drill-ready targets.

• The region hosts 50Mt contained copper within a 50km radius, with significant artisanal mining and processing activity.

Recent discoveries and drilling results

• Two major discoveries in 2025: Mostaza (high-grade Cu-Ag) and Viuda Negra (porphyry Au-Cu), both open for further expansion.

• Mostaza drilling intersected 20m at 3.3% Cu and 270g/t Ag, including 7m at 5.72% Cu and 490g/t Ag, significantly higher than historical grades.

• Viuda Negra scout drilling revealed broad zones of anomalous gold and copper, with up to 121.5m at 0.11g/t Au & 0.05% Cu.

Exploration strategy and pipeline

• Aggressive, low-cost exploration strategy with continuous drilling planned beyond 2026, targeting both resource expansion and new discoveries.

• 2026 work plan includes 10,000m diamond drilling at Mostaza, 5,000m RC drilling, metallurgy, and deep geophysical surveys.

• Multiple targets at various stages, from early-stage (Rulos, Brechia Amarilla) to advanced (Mostaza), with a focus on resource drilling and JORC compliance.