Depends on how well it comes off after washing (I haven't read announements in depth as to whether percentages quoted are post wash/screening) but generally out of the ground above 35-40% is needed to be economical, but you can do it at less percentages in certain circumstances.
Reactive silica is very low in this one which is a good sign for production costs and which smelters can be used etc.
forget about bau, page-4
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