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Location: 103 km N from Newman, Western Australia, Australia
PO Box 7071, Cloisters Square POPerthWestern Australia, Australia6850
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The Chichester Range forms the northern-most outcrop of the Hamersley Group for most of the Hamersley Iron Province. The Chichester Range comprises Cainozoic alluvial and colluvial sediments over lying the Hamersley Group Marra Mamba Formation and Fortescue Group’s youngest formation, the Jeerinah Formation. The Fortescue Valley sequence comprises Tertiary detritals (calcretised lacustrine and fluvial clay deposits) and the underlying Wittenoom Formation (dominated by dolomite of the Paraburdoo Member). The Chichester Range occurs over the Mine Area whilst the Fortescue Valley sequence covers the Southern Borefields (including Remote MAR). The stratigraphic units in the Mine area range from the Warrie Dolomite and Roy Hill Shale Member of the Jeerinah Formation of the Fortescue Group through the Nammuldi Member (NAM) of the Marra Mamba Iron Formation (MMIF) to Cainozoic sediments and recent regolith products of the Fortescue Valley and Chichester Range. The area is also cut by minor NE – SW trending dolerite dykes.Roy Hill is a low phosphorus, Marra Mamba iron ore deposit located in the Pilbara – close to Asia and in one of the world’s premier iron ore provinces.The Marra Mamba Iron Formation is the basal member of the Hamersley Group in Western Australia and is host to major iron-ore deposits in its upper Mt Newman Member.The geology at Roy Hill has been separated into six key lithological units for purpose of resource definition and block modelling: - Alluvium;- Calcrete;- Clay;- Detrital Iron Waste;- Jeerinah Formation; and- Nammuldi Member.The iron mineralisation resource to be mined includes mineralised sections of Marra Mamba unit, known as the Nammuldi Member, and the overlying detrital deposits.
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