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).
Field examination in January by Leadville's team of geologists indicates there is significant widespread gold mineralization occurring together with silica flooding and silica veinlet stockworks hosted by a flow-banded rhyodacite
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.