OAU 0.00% 0.5¢ ora gold limited

Ann: Further High - Grade Gold Intercercepts at Crown Prince, page-14

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    I was wondering about the term used in the release, to describe the geology of Crown Prince, namely OROGENIC TYPE..

    The Crown Prince deposit is a structurally controlled, orogenic type and is hosted by more competent doleritic rocks above a strongly deformed and ductile ultramafic package and as stockwork veins along the contacts of intercalated black shale units.
    Some gold mineralisation occurs in the near surface indurated and saprolitic layers in the lateritic profile as supergene mineralisation.
    Importantly, in fresh rock, gold mineralisation occurs in quartz veins hosted by chloritized, carbonated and strongly sheared meta-basalt, dolerite, black shale units and quartz porphyry, showing strong sericite-carbonate alteration in the vicinity of the quartz veins..

    I found a definition for anyone interested as follows…

    Orogenic gold deposits are hosted by shear zones in orogenic belts, specifically in metamorphosed fore-arc and back-arc regions and were formed during syn- to late metamorphic stages of orogeny.[3] Formation of orogenic gold deposits is related to structural evolution and structural geometry of lithospheric crust, as hydrothermal fluids migrate through pre-existing and active discontinuities (faults, shear zones, lithological boundaries) generated by tectonic processes.[2] These discontinuities provide pathways and channel fluid flow, not only of ore-bearing fluids, but also of fluids transporting metallic elements such as silver, arsenic, mercury and antimony and gases, as well as melts.[4] Gold-bearing fluids precipitate at an upper-crustal level between 3 and 15 km depth (possibly up to 20 km depth), forming vertically extensive quartz veins, typically below the transition of greenschist- to amphibolite metamorphic facies.[3]
 
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