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Location: 94 km E from Onslow, Western Australia, Australia
152-158 St Georges TerracePerthWestern Australia, Australia6000
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Mining scale, mining and mill throughput capaciites.Full profiles of select mines and projects.
Shaft depth, mining scale, backfill type and mill throughput data.Full profiles of select mines and projects.
Equipment type, model, size and quantity.Full profiles of select mines and projects.
Camp size, mine location and contacts.Full profiles of select mines and projects.
At the RRJV level, ownership is held by three major mining and steel industry participants:
• Rio Tinto – 53%;
• Mitsui Iron Ore Development (subsidiary of Mitsui & Co., Ltd.) – 33%;
• Nippon Steel – 14%.
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The Robe Mesa Orebody is classified as a Channel Iron Deposit (CID). These deposits are considered as ‘secondary’ as they have formed through erosion and transport and reconsolidation processes rather than an in-situ enrichment of an iron-rich protolith.Robe Mesa is part of the Robe River paleochannel, which is a tertiary-aged channel. The paleochannel is delineated by a series of flat-topped hills that are locally called ‘mesas’. The Mesa contains two cycles of deposition, and each has a sharp basal contact that shows an upwards increase in the number of iron-rich fragments.The Robe Mesa deposit occurs as two mineralised CID horizons of flat-lying pisolitic iron-stone that are each up to 25 m thick and separated by up to 20 m of ferruginous silt and sandstones. These CID horizons contain goethite as the dominant iron ore mineral. High-grade mineralisation is typically sourced from the MCU and MCL units, with the MMU and MML units representing a more poorly sorted and lower-grade pisolitic ironstone.The Robe Mesa is a fluvial deposit of goethite-rich fragments of wood and pisolites supported by a fine grained goethitic matrix. The deposit outlines the trace of a Tertiary-aged channel from the Robe River into older rocks of the Ashburton Formation that have since eroded.DimensionsThe Robe Mesa deposit has a total strike length of 1700 m (which is limited by the extent of the lease to the south and areas of heritage clearance to the north). Mineralisation extends to the north and the south. It has an across strike width of 800 m and extend vertically for approximately 70 m below surface.
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