DTR grade is relevant, because benchmark is done on 62% Fe. For every 1% increase in FE content, you get a premium, and vice versa. So sometimes it's worth sacrificing recovery for higher Fe content, sometimes not, trade off game.
However, what is more important is the weight recovery (instead of the head grade). A weight recovery of 20% means that 5 tons of ore needs to be crushed to produce one ton of concentrate, at whatever the concentrate grade sits at.
Therefore once you know the weight recovery (which is about 18-20% I believe) and the conc grade (69-71%), it gives you a pretty good picture of production scenario.
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