Ore processing

At Mount Tom Value, a high-grade plant produces lump product, fines and oversize. The oversize is returned for tertiary crushing immediately after which it becomes component with the feed to the item screens.

Low-grade ore is treated in a concentrator exactly where waste shale is removed by heavy-medium separation (HMS). The low-grade ore, a mixture of well-liberated haematite and shale, feeds the concentrator and undergoes HMS and wet high-intensity magnetic separation (WHIMS) to generate saleable lump and fines items. The WHIMS plant consists of three modules, each and every with 1 Jones DP317 separator.

At Paraburdoo, the fine ore stream from crushing and screening is wet screened and hydrocycloned to get rid of slimes. The Paraburdoo fines processing plant (PFPP) improves the excellent of fines by lowering gangue impurities, especially alumina. The PFPP treats all fines produced from Paraburdoo and Channar. The ultra-fines are removed by wet screens and hydrocyclones. The plant is designed to procedure approximately 12Mt/y of feed and accomplish a 91% recovery on a dry basis.

The Marandoo plant is designed to procedure as much as 12Mt/y of ore into lump and fines solutions. The Marandoo flowsheet excludes a primary stockpile, facilitating the integration of mine/plant operations, especially item good quality control.

All output from the screening plants and concentrators is transported from the mines by Hamersley’s own rail program for the port of Dampier for export.

Expansion

All of Rio Tinto’s Western Australian iron-ore operations are at the moment becoming expanded, mainly using the aim of meeting surging Chinese demand for iron ore. Thus capacity in the port of Dampier was recently expanded to 116Mt/y, while the expansion with the Yandicoogina mine to 36Mt/y was completed in late 2005.

In 2005, the business committed $290m for further capacity expansions at Mount Tom Cost, Marandoo and Nammuldi, then an further $1.35bn for higher capacity at the Dampier port and at Yandicoogina. The Dampier project is complete and now accounts for a combined output of 140Mt/y although Yandicoogina’s output will rise to 52Mt/y.

At Robe River, expansion of West Angelas was completed in late 2005 at a expense of $105m, increasing its capacity to 25Mt/y. $200m was spent on upgrading the Robe River rail link to the coast, with $860m budgeted for an expansion of the Cape Lambert port fromm 55Mt/y to 80Mt/y.

Future expansion

Rio Tinto has also began quite a few projects in line with its plans to increase annual production capacity beyond 220 million tonnes. The business is investing $500m in regional power development in the Pilbara, which calls for setting up a gas-powered power plant next for the 7 Mile rail operations center.

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