Highlights
The first of four defined copper-in-soil anomalies to be surveyed with ground magnetics at Santa Helena reveals a major regional fault trend and arcuate magnetic features, consistent with hydrothermal alteration associated with a porphyry intrusive-type setting.
The 600 x 200m core of the copper-in-soil geochemical anomaly has a coherent zone in excess of 300ppm Cu and a peak value of 448ppm Cu, against a background of 40ppm Cu. The anomaly has dimensions and a style that are consistent with a porphyry geochemical footprint. Stockwork quartz veining was exposed in a single trench excavated to date within the soil anomaly.
Previous scout drilling for gold targets 600m to the south-west of the copper anomaly showed deep weathering effects to a vertical depth of 50m, potentially leaching base metals.
The copper-in-soil features have associated NE/SW trending gold vein occurrences on their periphery. Scout drilling of these gold vein systems has identified porphyry style alteration and stockwork veining in intrusive wall-rocks to these structures. Both molybdenite and chalcopyrite have been identified in these veins.
CEO
SANTA HELENA PROJECT
The Santa Helena project is located immediately adjacent to the paved BR-163 federal highway in the
There is no history of copper production in the Santa Helena area and previous artisanal mining activity has focused on high-grade gold, hosted in vein structures.
The regional geology indicates a genetic link between the Teles-Pires intrusives and the Colider Formation volcanics, which is supported by regional scale geochemistry and geochronology with both units ranging in age from 1806-1757Ma. The Colider Fm consists of lavas and pyroclastic flows with inferred volcanic dome structures. The Teles Pires intrusives consist of alkali-feldspar granites and syenogranites and are interpreted to be the main host to porphyry-style intrusions in the Santa Helena area.
Younger (ca.1400Ma) sedimentary cover of conglomerates and arenites formerly overlay this basement. This cover, which is now reflected as remnant outliers, may have aided the preservation of porphyry alteration zones within the basement.
In a similar manner to the Jaca porphyry district (60km NE), anomalous copper occurrences have associated peripheral gold occurrences. ping, soil and rock chip sampling by Altamira has previously identified both extensions to the known vein gold targets in small scale gold workings, plus significant copper, molybdenum and gold anomalies in soils related to areas of porphyry-style alteration in a zone which extends 7km E-W by 4 km N-S, indicating the presence of a very large hydrothermal system. Pervasive 'red rock' alteration of the host intrusive rocks is found in many of the holes drilled to date.
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