Powerful Function of Hammer Crushers
Production in the course of 2006 totalled 97.2Mt of iron ore , of which 79.2Mt was sourced from Paraburdoo, Mount Tom Cost, Marandoo, Brockman and Yandicoogina, 8.2Mt came from the Eastern Range operation, and 9.8Mt came from the Channar joint venture.
Total shipments from the company’s ports had been 98.1Mt, an all-time record, driven largely by further increases in demand for iron ore from China. Rio Tinto also has a 53% holding inside the Robe River iron ore properties (Pannawonica and West Angelas), also in the Pilbara, which produced a further 52.9Mt of ore in the course of 2006.
In early 2008 Rio Tinto additional strengthened its leading position in the region using the discovery of a significant, new resource at Caliwingina (875Mt at 56.9% Fe).
The Caliwingina resource is inside the Mt Pyrton Project area which lies 100km northwest of Tom Value. It really is situated inside the Late Archaean to Early Proterozoic (2,765–2,470Ma) Hamersley Basin.
Geology and reserves
The Hamersley iron resources, contained in banded iron formations of precambrian age, cover extensive areas of the Pilbara region. Haematite would be the principal iron mineral.
In the first quarter of 2010 proven and probable reserves at Hamersley’s Pilbara operations yielded three,344Mt of saleable ore. The Robe River operations had a further 696Mt of proven and probable ore, grading among 57.2% and 62.2% iron. Rio Tinto also has substantial undeveloped resources in the Pilbara, at the same time as a 50% interest in the Hope Downs joint venture that was completed in 2008.
Mining
All of Hamersley Iron’s mines are standard open pits. Material is drilled and blasted in benches, blast holes getting charged with an ammonium nitrate/fuel oil (ANFO) mixture and heavy ANFO dispensed by bulk explosive trucks. Ore is loaded into haul trucks by shovels, hydraulic excavators or front-end-loaders, and transported for the main crusher. It really is then processed in a crushing and screening plant to create fine ore and lump ore.
At Marandoo, four pits are operational and others will be brought into operation inside the future.
The low bench height (10m), compared with Mount Tom Value (15m) and Paraburdoo (14m), facilitates selective mining and minimises dilution, but equipment is smaller than at Hamersley’s other operations.
Brockman enhances the stability and flexibility of Hamersley operations and raises the proportion of lump in Hamersley’s item mix. It’s a contractor operation with management and grade manage coming below Hamersley’s direction. The deposit consists of detrital and conglomerate haematite.
At Channar, crusher feed comes from Channar Main Pit and Channar East, with Paraburdoo’s contribution to total production getting been lowered accordingly to retain continuous output as Channar’s has built as much as more than 10Mt/y.
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