Polar Star has five exploration properties within the coastal IOCG belt, including a large phosphate project near Antofagasta and the Los Azules copper project near Copiapo. The most advance of these exploration assets is Los Azules.
The property lies along the western edge of the Late Cretaceous – Paleocene Cabaca de Vaca intrusive that occurs within the Cu-Au Metallogenic Belt of the Chilean pre-Cordillera. This batholithic body is host to numerous post-magmatic structurally controlled collapse breccias.
At Los Azules over 100 post-magmatic hydrothermal collapse breccia pipes are distributed in clusters throughout the property. The individual pipes, which are circular to elliptical in plan, range from 5 metres to 350 metres in diameter. The largest of these, the Araya Breccia, is approximately 1,100 metres long and averages 150 metres in width.
The hydrothermal copper, gold and molybdenum mineralization occurs within the breccia pipes and may be divided into an early fragment replacement stage, followed by open-space filling.
Surface oxidation is up to 150 metres deep and has produced a blanket of readily leachable copper minerals including atacamite, chrysocolla, brocanthite, copper wad and copper pitch. Locally, an irregular zone of secondary Sulphide enrichment consisting essentially of chalcocite and minor pyrite is developed at the base of the oxide zone.