Haw in TH, page-22

Exactly Ocka,

A refresh from SRK Consulting report :

Low Grinding Costs
Comprehensive testing on diamond core samples by Ammtec has provided a Bond Work Index of11kWh/t. This is relatively soft for magnetite BIF mineralisation. In comparison, most WA magnetite BIF projects have a Bond Work Index of circa 18 – 20 kWh/t.

Low Operating Costs
The combination of being able to produce a quality concentrate at a relatively coarse grind and the soft nature of the mineralisation has a very significant positive economic impact for a mining project at Mt Bevan. A major OPEX cost in magnetite projects is power consumption. Preliminary energy calculations based on the grind and bond work index indicate power requirements of only 12 kWh/t – this is very low compared to that of about 30 kWh/t for typical WA magnetite projects