Past exploration at Maripa includes 134 core holes, for a total of 9,000 metres, which partially defined five (5) broad gold zones, namely Changement, Filon Dron, Maripa Sud-Est, Rhyodacite
and Filon Scieur.
The material studied is an extrusive porphyritic igneous rock called rhyodacite
The lithology around CP is composed of gneiss (quartz-feldspars), shale (quartz-mica), marble, amphibolite, and quartzite from Permic to Jurassic  and metamorphic, granitic, and granodiorite rocks which are intruded by batholitic rocks , together with dacite and andesite from Miocene and rhyodacite
from Quaternary .
Rainbow Falls, one of California's most photographed waterfalls, plunges 101 feet over a rhyodacite
The geochemical studies show that the Deosai volcanics are dacite to rhyodacite
in composition while the meta-volcanics of Burji-La Formation show basalt to basaltic-andesite in composition.
The volcanic rocks in the Tarom area vary from rhyodacite
and dacite to basalt.
The enargite-bearing rhyodacite
porphyry hosting the mineralisation, shown in figures 1 and 2, has yielded the following results:
Melanic soils develop from a variety of parent materials (Van der Merwe 2000), including arkosic sandstone, siltstone, mudstone, shale, diamictite, dolerite, basalt, notite, amphibolite, granite, gneiss, rhyodacite
, and carbonates.
It is characterized as a Plinian eruption, of explosive power and with a widely dispersed rhyodacite
ash (Hanson, 1965) composed of glass, plagioclase, hornblende, hypersthene, and magnetite (Lerbekmo and Campbell, 1969).
The mine unit traditionally called "trachyte" is rhyodacite
, and that called "andesite" is, in part, basaltic andesite, both of which are of calc-alkaline affinity.
It consists of a potassic rhyodacite
intruded into Triassic sediments.