Hi Michael had a think about this some time ago and this is what i came up with
I think that for each tonne of moly they refine they will also get 600 grams of Re
if 1000 tonnes of ore @ 0.1% at 100% recovery = 1 tonne of moly and only 600 grams of Re as the recovery rate for the Re is not as good looks like 60 %
kev