Geology and Exploration Targets
The geology of Especularita is dominated by an extensive lithocap alteration zone formed at the intersection of several sets of crustal-scale structures and the contact margin of the Quilitapia Granodiorite and overlying andesitic volcanics.
The Lithocap System
Remote sensing studies suggest that the lithocap alteration is larger and more intense than that associated with the large Andacollo copper and gold mine located 90km to the north. Evidence of small-scale artisanal mining is concentrated at the contact of the granodiorite and the base of the lithocap zone.
These systems are common above porphyry Cu-Au mineralising systems, providing strong evidence for the potential of discovering porphyry copper style mineralisation beneath the lithocap.
Mineralisation Styles
Besides significant porphyry mineralisation potential, exploration across Especularita—including regional drilling, magnetics, stream sediment, and mapping surveys—has identified evidence of large-scale IOCG (Iron-oxide Copper-Gold) and IRGS (Intrusive-related Gold System) type mineralisation.
The exploration team is working to establish a pipe-line of advanced targets which it aims to drill test over the coming years.
Strategic Growth & Option Agreements
Following the signing of new option agreements over the Cerro Negro and Artemisa concessions in 2024, which include the Mostaza Mine and Viuda Negra Prospect, GSC strengthened its pipeline of additional targets. The primary focus is on drilling at the Mostaza Mine to progress it towards future resource definition.
Drilling Results & Field Operations
Phase I and II diamond drilling at Cerro Negro targeted high-grade Cu-Ag mineralisation beneath the historical Mostaza mine pit. Phase II confirmed mineralisation up to 500 metres south of the pit, with best intercepts including 10.4% Cu and 672g/t Ag. Subsequent geophysical surveys defined a 2.5-kilometre-long anomaly now guiding a Phase III drill programme scheduled for August 2025.
Elsewhere, scout drilling at Viuda Negra confirmed porphyry-style alteration, with hydrothermal breccias and quartz-magnetite vein swarms. Seven RC holes intersected structurally controlled Au-Ag mineralisation, including 12m @ 1.5g/t Au and 0.47% Cu. Earlier drilling at Teresita and Abundante confirmed IRGS-style mineralisation with grades up to 13.7g/t Au and 7.22% Cu.
GALLERY
Updates on Especularita
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