Geology
Gold mineralisation at Maries Find - Bingin predominantly occurs within lenticular quartz reefs and stringers within sheared and brecciated fault zones and lithological contacts. The vein at Great Bingin has a strike length of approximately 290m and is interpreted to be plunging to the north east.
P77/4350 lies within the basal section of the 'Bullfinch greenstone belt' adjacent to the Maxman Dome granitic basement. Rock types include inter-bedded basic greenschists, basic lavas, and banded iron formations (BIF) of Archaean age. The majority of the greenstones are basic schists and are often brown due to biotite alteration adjacent to high grade gold mineralisation.
The dominant sulphide minerals associated with gold ores are pyrite and pyrrhotite with minor arsenopyrite and chalcopyrite as well as sporadic galena and scheelite. Gold occurs as free particles and as inclusions in pyrite and arsenopyrite, but the ore was not considered refractory when mined.
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