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Location: 144 km E from Tom Price, Western Australia, Australia
152-158 St Georges TerracePerthWestern Australia, Australia6000
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Yandicoogina is a large pisolitic iron deposit that follows a winding palaeochannel approximately 80 km long. Much of the area is covered by alluvial gravels overlying a lateritic clay unit known as the Eastern Clay. The Channel Iron Deposit (CID) palaeochannel is saucer-shaped with a simple structure exhibiting no folds or faults, with the main ore zone approximately 40 – 50 m thick in the centre and thins towards the channel margins. The Yandicoogina area consists of Proterozoic basement rocks of the Hamersley Group. The majority of the outcrop being the Weeli Wolli Formation, comprising jaspilite and shale. The Weeli Wolli Formation is overlain by relatively thin Tertiary and Quaternary sediments. The basement rocks comprise Banded Iron Formation (BIF), chert, shale and volcanic rocks. The thin alluvium and colluvium cover consists of valley fill and recent alluvium deposits, which includes the Channel Iron Deposit (CID), and are restricted to areas close to present drainages.The CID consists of pisolitic clasts of goethite-hematite, clay and fossil wood fragments with an approximately average thickness of 60m. The CID clasts (peloids) are typically irregular or sub-angular to sub-rounded in shape. These iron rich peloids are interpreted to represent the end product of detrital weathering via sheet wash processes deposited in low lying areas (Ramanaidou, et al, 2003).The modern drainage of the Yandicoogina, Marillana, Weeli Wolli Creeks and other tributaries contain unconsolidated conglomerates (river gravels) up to 5m thick. The river gravels contain boulder to gravel size clasts comprising mainly BIF, shale, siltstone, chert, dolerite and minor calcrete and duricrust.Yandicoogina Operations includes Junction Central (JC) and Junction South East (JSE) deposits; and the more recently approved Junction South West (JSW-A & C) and Oxbow deposits.
