- Nancagua
Introduction
The Nancagua property is located 180 kilometres by road south of Santiago, in the Province of Colchagua, Region VI, Chile, at approximately 300 metres mean elevation and is readily accessible from Nancagua, 6 kilometres via paved road to the village of Cabreria at the centre of the property.
Claims & Ownership
The property consists of 4 exploration concessions totaling 1,200 hectares staked and owned 100% by Polar Star.
Property Geology
The Nancagua prospect is an epithermal gold – silver system about 700 metres wide and at least 3 kilometers long situated on the western flank of the Chilean Central Graben. This system invades and alters a series of gently south dipping Paleocene andesitic fragmentals and rhyolitic ignimbrites. A strong system of northerly trending faults cuts this sequence and is the locus of extensive hydrothermal alteration and precious metal mineralization.
Mineralization
At surface these mineralised faults are zones of quartz veining and silicification within an envelope of sericite – clay alteration containing limonite, hematite and goethite. At depth in drill holes and locally at surface in pervasively silicified zones l-2% pyrite and trace chalcopyrite is present. Quartz tends to be cryptocrystalline and locally drussy.
Exploration History
Extensive geological mapping, geochemical sampling and geophysics conducted by Agate Bay Resources in 1994 outlined seven zones of extensive gold and silver enriched veining and silcification. Surface values from these zones range from a few grams gold and silver to over 15 g/t Au over 2.5m width with adjacent wall rocks grading 0.5 to 2.5 g/t over several to 10 metres. In 1995-96 Agate also completed to two short phases of reconnaissance drilling totaling about 1,600 metres in 20 shallow holes. Significant values were cut in eight holes and range from 1.5 g/t Au +6.6 g/t Ag over 31 metres to 9.2 g/t Au + 65 g/t Ag over 11 metres.
Top