STM.ASX: Large gold-copper mineralisation outside Bramaderos resource

Large gold-copper mineralisation outside Bramaderos resource

Stock	Sunstone Metals Ltd (STM.ASX)
Release Time	3 Aug 2026, 8:35 a.m.
Price Sensitive	Yes

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Sunstone Metals Announces Large Gold-Copper Mineralisation at Bramaderos

Key Points

All 24 holes in the drilling program returned long mineralised intersections
Mineralisation outlined over 520m x 230m area outside existing resource
Porotillo discovery will be included in the upcoming December quarter Resource update

Full Summary

Sunstone Metals Ltd announced significant gold-copper mineralisation outside its Bramaderos resource in Ecuador. Drilling and trenching have established mineralisation over a 520m x 230m area. All 24 holes assayed in the recent drilling program at Porotillo, Copete, and Melonal returned long mineralised intersections. The strongest hole, PTDD017 at Porotillo, returned 196m at 0.62 g/t Au-Eq. The mineralisation will be included in the upcoming December quarter Resource update. Assays are pending for additional holes and trenches, with results expected in August.

Guidance

Sunstone Metals expects to include the new mineralisation in the upcoming December quarter Resource update.

Outlook

Sunstone Metals is optimistic about the potential of the new mineralisation to enhance the Bramaderos resource and contribute to future resource estimates.