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CHIRANO GOLD MINE
Mineralisation
The gold deposits comprise fractured and altered granite, and include stacked arrays of parallel veinlets, veinlet stockworks, and mineralised cataclasites. The Chirano gold deposits occur within 200 metres to the west of the Chirano Shear. The geometry and shape of the deposits range from tabular (Obra), or pipe-like (Tano), to multiple parallel lodes (Paboase). The mineralised zone thickness ranges from a few metres to over 70 metres. Most deposits dip very steeply towards the west or southwest, and also plunge very steeply. Generally, the tenor of the gold mineralisation correlates with the intensity of alteration, veining and brecciation. The gold mineralisation is associated with 1% to 5% pyrite, and the distribution of gold appears to be closely associated with the presence of pyrite. The hydrothermal alteration assemblage is characterised by ankerite, albite, muscovite and pyrite which overprint earlier hematite dusting of the granite.
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