Outcropping mineral deposits in wet climates

In the CSIRO study, six deposits in areas of moderate-to-high rainfall were studied. Five of these deposits occur in the Mt Read volcanics of western Tasmania, Australia. These volcanics are of acid to intermediate composition and consist of a central belt of massive rhyolites and dacites (together with minor andesites) flanked to the west by a 

In an exploration area in northern Peru, igneous rocks cover an area of several square km within a metamorphosed series of quartzites and limestones. The younger sequence consists of ignimbrites, tuffs and tuffites of approximately 1000 m thickness. The metamorphism produced skams, which are connected with the ore body. A porphyry Cu deposit occurs in the metamorphosed rocks and is characterised by intense hydrothermal alteration (quartz-kaolinite-sericite) which makes determination and classification of magmatic and sedimentary rocks at the surface very difficult. A zone of propylitic alteration can locally be followed up to 500 m into the andesitic-dioritic wall rocks. 

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