Data from Morenci, Ray, Chuquicamata, and Spence provide type examples of supergene
enrichment in classic porphyry copper deposits.
Copper mineralizatoin in the Gawuch Formation has been identified in the field: 1) copper mineralization along quartz veins, 2) copper mineralization along foliation planes, 3) disseminated copper mineralization and 4) supergene
enrichment of copper (Tahirkheli et al., 1997).
This single supergene
also appears important in melanism in other species, including moths.
Below the leached cap was a zone of mild supergene
enrichment, which reached an average depth of about 100 feet before encountering primary sulfides.
Porphyry intrusion and hypogene mineralization are controlled by faults, and are followed by supergene
enrichment in a semi-arid climate.
It is indeed a cause for celebration, then, that both Skep and solo artist Volente are in the studio recording new material, with plans for a further EP release by Carmarthen's Supergene
on the way.
The main stage has gigs by 10 other groups, including local bands Supergene
and Zabrinkski, with Powersteppers having the headlining session at 10pm.
Macroscopic vermiculite formation was attributed to either hydrothermal (Morel, 1955) and/or supergene
processes (de la Calle and Suquet, 1988; Zhelyaskova-Panayotova et al., 1992, 1993; Fatma Toksoy-Koksal et al., 2001).
Of economic importance was the extent of a supergene
enriched copper zone, identified from an intersection of 16.6 m @ 19.5% Cu in the middle of the gravity high.
The weathering of these rocks, if originally mineralised with low grade gold and sulphides, can result in the precipitation of a higher grade 'supergene
' and potentially economic gold mineralised residuum, above a more resistant basal layer.
The Domeyko Cordillera and its associated copper mines and prospects are controlled by a series of coastal-parallel, approximately north-south oriented, faults and fault zones, which have played an intimate and intricate part in the evolution and development of the giant deposits located along the belt, including both hypogene (syn-mineral) and supergene
(post-mineral) copper deposition.