Bramaderos resource up 72% to 6.2Moz AuEq

• Bramaderos Mineral Resource Estimate (MRE) increased by 2.6Moz AuEq to 6.2Moz AuEq
• Indicated Resource now totals 3.3Moz AuEq, a 450% increase over the previous MRE
• Updated Porphyry Exploration Target of 270 - 430Mt at a grade between 0.41 and 0.69g/t AuEq for 3.5Moz - 9.5Moz AuEq

Sunstone Metals Ltd announced a significant increase in the Bramaderos Gold-Copper Project resource, with the Mineral Resource Estimate (MRE) rising by 2.6Moz AuEq to 6.2Moz AuEq. The increase is driven by new Resource at Copete-Porotillo, expansion of Melonal and existing pit footprint, and higher gold-copper price assumptions. The Indicated Resource now totals 3.3Moz AuEq, a 450% increase over the previous MRE, establishing a strong foundation for future studies for a Bramaderos open pit mine development. The updated Porphyry Exploration Target of 270 - 430Mt at a grade between 0.41 and 0.69g/t AuEq for 3.5Moz - 9.5Moz AuEq demonstrates strong scope for further growth. The Resource is limited to the pit-constrained Brama-Alba-Melonal porphyry contiguous deposits and the new 2026 discovery at Porotillo-Copete. Future drilling will focus on exploration upside potential to continue driving rapid resource growth.

Sunstone Metals Ltd sees exceptional potential for further strong resource growth, with a focus on exploration upside potential to drive rapid resource growth.