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Location: 7 km SW from Tom Price, Western Australia, Australia
1 Mine RoadTom PriceWestern Australia, Australia6751
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Mineralisation at Tom Price and Western Turner Syncline mines is haematite/goethite hosted within the banded iron formations of the Brockman Formation. Detrital deposits also occur at these sites.Mineralisation at Marandoo mine occurs as goethite/haematite within the banded iron formation of the Marra Mamba Formation. Some detrital mineralisation also occurs.The BIF is a member of the ~620 m thick Brockman Iron Formation which makes up part of the 2.63 2.45 Ga Hamersley Group. The Hamersley Group comprises almost 2.5 km of consecutive sedimentary and volcanic rocks. In the lower part, it consists of dolomite, shale and BIF, while the upper part consists of dolerite, various lava types and BIF with minor amounts of tuffs and shales. Underlying the Hamersley Group, is the 2.78–2.63 Ga Fortescue Group, which consists of flood basalts and rhyolites. These volcanics were laid down on the uplifted and eroded Pilbara block. This volcanic succession may contain remnants of a Large Igneous Province (LIP).The Brockman Iron Formation ofthe Hamersley Group is divided into four sub-lithostratigraphic units, namely the lowermost Dales Gorge Member (BIF), the Whaleback Shale Member, the Joffre Member (BIF), and the uppermost Yandicoogina Shale Member. After deposition, these laterally extensive BIF have all experienced minor folding and basinal uplift along with low-grade regional metamorphism – from burial prehnite–pumpellyite facies to greenschist facies.Brockman Iron Formation The Brockman Iron Formation has an unmineralised thickness of approximately 620 m. It is divided from the base upward into four members: Dales Gorge, Whaleback Shale, Joffre and Yandicoogina Shale. The high grade iron deposits at Tom Price, Western Turner Syncline, Paraburdoo, Channar, Eastern Range, Brockman 2, Brockman 4, Hope Downs 4 and Gudai-Darri are hosted predominantly by the Dales Gorge and Joffre Members, with only very minor mineralisation in the Whaleback and Yandicoogina Shales. The Dales Gorge Member has a thickness of approximately 140 m and consists of an alternating sequence of 17 BIF and 16 shale macrobands. BIF macrobands are comprised of mesobands of chert and iron-rich material in a chert matrix (Trendall, 1983) Mesobands commonly consist of millimetre alternations of chert, shale and iron-rich bands, termed microbands.The Dales Gorge Member is stranded by Rio Tinto into DG3, DG2 and DG1, on the basis of the concentration of the thicker shale bands from the top to the bottom. When mineralised, the two strands with lesser shale bands (DG3 and DG1) are generally high grade and the strand with thick shale bands (DG2) is low grade and aluminous. Also informally included is the Foot Wall Zone (FWZ), which is part of the Mt McRae Shale (the Colonial Chert Member).The Whaleback Shale Member overlies the Dales Gorge Member and is approximately 50 m thick. The member consists of thinly bedded shales with thicker chert or BIF bands. The member is subdivided into two zones: a lower zone comprising four alternating macrobands of shale and BIF (WS1, WB1, WS2, and WB2) and an upper zone (WS3) consisting of mesobanded chert and shale (Harmsworth et al., 1990). The Joffre Member conformably overlies the Whaleback Shale and is characterised by its homogeneity. The member consists of approximately 335 m of BIF with irregularly interspersed shales. The Joffre Member is sub-divided by Rio Tinto geologists into six sub-units, from J1 to J6, on the basis of shale content. J2, J4 and J6 contain less shale than BIF, whereas J1, J3 and J5 are more shale-rich with lower BIF content (Harmsworth et al., 1990).B1 and S17 depositsThe B1 and S17 deposits occur within the Brockman Iron Formation of the Hamersley Group, and are typical of similar Banded Iron Formation (BIF) derived deposits that occur throughout the Pilbara. The Brockman Iron Formation comprises four members (Yandicoogina Shale, Joffre, Whaleback Shale, and Dales Gorge), and is underlain by the Mount McRae Shale Formation (MCS). Mineralisation at B1 and S17 occurs primarily within the Dales Gorge and Joffre Members, and to a lesser extent within the Whaleback Shale Member Both B1 and S17 are predominantly bedded deposits, although some deposits of secondary surficial ironstone have also accumulated within the Brockman Iron Formation.
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