El Fierro is a large (approximately 10 km x 10 km) magmatic hydrothermal system located on the eastern margin of an interpreted Miocene caldera. Magmatism as currently known is centered on the Pyros porphyry stock and the Antenna Hill diorite stock, both of 20 Ma.
Peripheral to these intrusive centers and distributed in four main zones there are a number of sub-epithermal polymetallic veins that were the initial focus of Sable’s exploration and yielded very significant intercepts of Ag, Au, Cu, Pb, Zn mineralization in multiple holes drilled by Sable.
After discovering the Pyros porphyry, Sable’s exploration focus shifted to the discovery of a large Cu-Au-Mo porphyry deposit which is currently the target.
Figure 1
Distribution of polymetallic veins around the magmatic centres of Pyros and Antenna Hill
Sable drilled 13 holes at Pyros in 2022 discovering a large multiphase Miocene stock hosted within Permian granitic rocks; several of the holes intercepted significant intervals of Cu-Mo-Au mineralization as shown in Figure 2.
Definition of higher-grade zones at Pyros will be the main objective of future campaigns. Additionally, Sable drilled one scout hole at the Antenna Hill which returned multiple short intervals of Au-Cu-Ag mineralization including 8.75 m @ 0.88% CuEq, and 2.0 m @ 1.5% Cu.
These anomalous gold, copper, and silver values show the metal affinity of the Antenna Hill target system and enhance the quality of the exploration target.
Figure 2
Significant drill intercepts at the Pyros porphyry zone
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