The Region

Paleocene Epithermal Belt

The Paleocene Mineral Province of northern Chile has excellent metal endowment. It hosts a diverse range of mineral deposit types, from classic large-scale porphyry Cu-Mo deposits like the Spence Mine, to the world-class low sulphidation epithermal (LSE) deposits at El Peñón. Historical exploration focused on large-scale porphyry deposits while the comparatively smaller epithermal deposits received less attention.

The challenges of the regional topography also create opportunity. The extensive areas of flat gravel covered valleys (“pampas”) hide much of the bedrock which hosts mineralization. LSE deposits tend to be narrow and low profile at the surface. The regional cover and poor surface expression of these systems make them less obvious during exploration. Astra’s team is credited with discovering LSE deposits hosted in these very conditions, and believes the region has outstanding opportunity for discovery of world-class gold-silver deposits.

A thorough technical understanding of the region is essential for discovery. The Paleocene Mineral Province is hosted by voluminous volcanics and intrusions accumulated within narrow fault-bounded extensional basins. The extensional basin development was interrupted and ultimately terminated in the middle Eocene by short lived compressional phases. This complex interplay of regional structural and magmatic history, intimately linked to the region’s tectonic evolution, exerts fundamental control over the timing and location of mineral deposits.

Astra will apply deep epithermal knowledge, state of the art geological, geophysical and spectral interpretations combined with extensive in-country networks to identify opportunities in this world-class underexplored gold-silver province.

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Pampa Pacienca Property

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