The proportion of each metal reporting to concentrate is assumed to be the same for each metal, ie 52.3% recovery for each metal. It depends on the REO bearing minerals and what the recovery of each mineral actually is.
From memory Xenotime was the only mineral mentioned (?)
This would mean that the proportional assays of thee con are the same as feed, by this I mean if 50% of the REO in feed is ,say, La, then 50% of the REO in con is also La, etc etc for the other metals.
I won't even hazard a guess at production cost but the maths I did "way back when" on the amount of dirt they need to shift to produce a tonne of con gets worse the lower the recovery gets.
I'm not sufficiently tempted to revisit my maths but if you can find the posts then I'm pretty sure I put the formula up for the calcs on how many tonnes you need to mine to produce a tonne of con at X grade and Y recovery.
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