Sunstone Metals (STM) RRS Summer Series Melbourne summary

Strategy and market positioning

• Focus on developing two large, long-life, low-AISC gold-copper assets in Ecuador, prioritizing copper (25%) and gold (75%).

• Emphasis on resource growth, scalable development, and clear funding pathways for value realization.

• Projects are located in a globally significant copper-gold belt with strong government support for responsible mining.

• Ecuador offers a cost advantage with low energy and labor costs, USD currency, and low-carbon energy sources.

• Record high gold prices and strategic copper demand underpin project economics.

Flagship projects and resource updates

• Bramaderos: 3.6Moz AuEq JORC Resource (2025), with an exploration target of 5.0–12.9Moz AuEq.

• El Palmar: 1.2Moz AuEq maiden JORC Resource (2024), with an exploration target of 15–45Moz AuEq.

• Both projects feature large, near-surface, bulk-tonnage mineralization with significant upside from ongoing drilling.

• Bramaderos' Limon area shows high-grade intersections, including 185m @ 2.85g/t AuEq.

• El Palmar drilling confirms mineralization extends beyond 1,750m deep, with potential for further resource growth.

Development plans and growth potential

• Bramaderos development staged: initial focus on Brama-Alba-Melonal, followed by conversion of additional targets.

• Scoping study for Bramaderos expected in 1H 2026, with potential for rapid resource expansion.

• El Palmar positioned for bulk-scale, low-cost open-pit mining, leveraging regional infrastructure and cost advantages.

• Exploration targets at both projects to be tested with further drilling over the next two years.

• Ongoing community engagement and sustainability initiatives support project advancement.