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Deposit Synonyms
Mount Cogan; Mount Cultaga; Mount Cultalga
Mineral District
Deposit Summary
U anomaly associated with disseminated Cu and Au mineralisation in a pyritic laminated albite rock near the contact with an amphibolite body.
Deposit Description
WOMAN IN WHITE, numerous shafts and pits on a lode of quartzose, felspathic, ferruginous veinstone with blue and green copper carbonates. Disseminated copper and gold occur in a pyritic laminated albite rock, with disseminated magnetite near its contact with an amphibolite body (Env 2324).The amphibolite body varies from a melanocratic quartz-amphibole to a mesocratic hornblende granite and is assigned to the 1690Ma Lady Louise Suite. A grab sample assayed 0.86 % Cu and 6 g/t Au. Very coarse prismatic olive green actinolite is common. Modern exploration includes soil, stream sediment and rockchip sampling, ground magnetics, induced polarisation and pulse EM. Much of the exploration over the area has been centred on the mine area.
Mineralisation is fracture controlled, with patchy pervasive replacement of albitite by stockwork veins of biotite-magnetite-pyrite-chalcopyrite. Host lithologies are described as psammopelitic schist of the Peryhumuck Formation, calc-feldsparite and albitised quartz-eye felsic volcanic (1703 Ma) of the Abminga Suite. Corundum has been observed as blue-grey, crude barrel-shaped, non-gem quality prisms as porphyroblasts in gneiss and schist.
Discovery Year
< 1887
Commodities
Gold, Copper, Corundum
Ore Minerals
Azurite, Chalcopyrite, Chrysocolla, Copper, Gold, Malachite
Gangue Minerals
Actinolite, Pyrite, Quartz
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