Riqueza shaping up as epithermal and porphyry system

By Trevor Hoey. Published at Aug 19, 2019, in Mining

Inca Minerals Ltd (ASX:ICG) has received results of geophysical 3D modelling that utilised data from the South32-funded geophysical survey conducted at the Riqueza Project in 2018.

This comes on the back of other exciting developments at the project which is located in Peru.

In July, Inca Minerals received assay results from 22 rock chip channel samples collected during a brief reconnaissance program that was conducted at Riqueza in conjunction with a more detailed expert porphyry/skarn mapping program.

Both programs are part of the Inca-South32 Year-1 exploration campaign.

The assay results as detailed below indicate strong epithermal silver-copper-manganese mineralisation broadly associated with a rhyolite dome and related structures, recently interpreted at Alteration Ridge.

The specific area subject of 3D modelling referred to by management on Monday covers four high priority geophysical targets in the greater Alteration Ridge Area as shown below.

All of these are located within the new Cuncayoc Copper Prospect area and the Huasijaja P-2 target.

Several important magnetic bodies have been identified extending below these surface geophysical targets.

The largest magnetic body identified occurs below the Huasijaja target, and it is approximately 1000 metres long, 400 metres wide and the 500 metres thickness and occurs close to the surface.

Discussing the geological issues at play, Inca’s managing director Ross Brown said, “In the context of intrusive activity, structures created during tensional movement are the most prospective for porphyry emplacement.

“The NE-SW orientation of the recently modelled magnetic bodies is therefore highly encouraging.

‘’It is felt that the newly identified magnetic bodies have a shape and configuration like that of late-stage intrusions and that these are possibly related to the rhyolite dome.

‘’The occurrence of an early-stage rhyolite dome and array of later stage intrusions is entirely consistent with the geological development and internal architecture of epithermal and porphyry systems.’’

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