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Geology
- Property Geology
- Structure
The Rio Grande complex is localized along the ESE-trending Archibarca lineament; where it is intersected by NNE-trending “East Fissure” parallel structures (Figure 4). The faults vary from large, property-extensive structures to narrow, outcrop-specific structures. The character of the faults measured is quite variable, ranging from single, narrow fault surfaces to complex fault/fracture zones exhibiting gouge and broken rock. Structural mapping indicates there are two principal orientations of faults; a prominent ESE-trending set (“Archibarca Transverse Zone”) and lesser prominent NE-trending set (“East Fissure Fault Zone”), which together define the rhomb-shaped, annular (i.e. ring-like) geometry of the mineralization.
At the deposit and outcrop scales, zones of higher fracture density (i.e., D>5 per metre) mimic the regional structural architecture; with ESE- and NE- fracture sets being the most prominent orientations hosting blue-green and black copper oxides within the individual mineralized zones. The mineralized zones are steeply, inward-dipping (i.e., towards the centre of the Rio Grande complex).
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