Sunstone Metals (STM) Resources Rising Stars Gold Coast Conference summary

Strategy and market context

• Advancing two scalable, long-life gold-copper projects in Ecuador, targeting Tier 1 assets and value realization.

• Ecuador offers low costs, USD currency and government support for responsible mining; recent major M&A highlights regional investment interest.

• Record gold prices and copper demand driven by electrification and supply shortfalls support project economics.

Flagship assets and resource growth

• Bramaderos has a 3.6Moz AuEq 2025 JORC Resource and a 5.0–12.9Moz AuEq exploration target; a significant resource upgrade is expected in late 2026.

• Copete and Porotillo have a 1.7–3.5Moz exploration target; shallow holes were mineralized from surface to end of hole, with three averaging 0.6–0.7 g.

• El Palmar has a 1.2Moz AuEq maiden JORC Resource and a 15–45Moz AuEq exploration target, with growth potential along the Toachi Fault.

• Melonal drilling has extended mineralization south; its porphyry systems are viewed as interconnected and potentially part of a 2km by 2km open pit.

• El Palmar is surrounded by major deposits and has multiple untested targets; two porphyry fingers extend upward from depth and meet near surface.

Operational and technical highlights

• Drilling at Bramaderos' Copete-Porotillo and Limon continues to deliver fully mineralized holes; further Limon drilling is planned.

• El Palmar drilling has defined three major targets, T1, T2 and T3; deep drilling indicates potential for higher copper grades.

• Both projects have mineralization at surface, low strip ratios and potential for rapid resource expansion through ongoing drilling.

• Projects benefit from low energy and labor costs and access to grid power and highways.