Some of these exploration targets consist of old shallow pits, caved shafts and historic shallow underground workings in areas with extensive hydrothermal alteration, hosted by major regional structures in a felsic
The NNR is characterized by mafic and felsic
volcanic centers associated with crustal extensions between 15.0 and 16.5 million years old.
The massive sulphide zones occur on the boundary between the felsic
porphyry intrusive and the carbonaceous sediments of the Bottle Creek Formation with significant results from EMDD001 shown in Figure 3 Section AA below.
This volcanic succession hosts Au-rich mineralized sub-volcanic felsic
bodies yielding slightly younger ages and is covered by Paleocene intermediate lavas with hypabyssal intrusions with ages around 48 Ma.
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The property geology contains the contact between Confederation and Balmer Assemblage rock units as well as folded mafic and ultramafic volcanics with mafic and felsic
intrusives also present.
The nature and optical character of the major framework constituents and composition of the heavy mineral assemblage suggest that the sediments were largely derived from acidic (felsic
) igneous rocks.
* The Riqueza Marina project is based on a suite of bimodal volcanic rocks, including an interpreted felsic
dome, that contain outcropping silica-iron exhalite.
It contains also some small felsic
enclaves and has sharp contacts with their granitoid host rocks, representing possibly the youngest magmatic unit in the pluton.
, Mafic and Intermediate are all types of which natural substance?
Dominant classes for GEO arc (predominantly Siluro-Devonian) igneous felsic
intrusive, igneous felsic
volcanic, (Adaminaby Group) marine sedimentary siliciclastic, sedimentary siliciclastic (includes Siluro-Devonian rift basin, Permo-Triassic Sydney Basin and Cenozoic sediments), and to a lesser extent igneous mafic volcanic (Cenozoic basalts) and quartz-rich arenite to rudite (includes Siluro-Devonian rift basin and Permo-Triassic Sydney Basin sediments).