what is a good grade?, page-3

Okay, and it seems to get back to grains we're talking 1 grain = (approx) 65mg, so 1 gram = 15 grains.

So when we hit 16 grains per tonne, it might be commercially viable, if it's over 30 grains per tonne it's very likely commercially viable.

And if it hits the ridiculous 4000 grains per tonne based on that 1.5kg sample someone did the calcs on earlier in a thread then we're all going to be ridiculously rich ;) (This is not an actual realistic possibillity, DYOR)

Thanks for that... that answers my question on how rich the samples need to be, and puts all the numbers a little in perspective for me too.

Does anyone have any idea how the size of CFRs fields in Madagascar translates into what kind of tonnage of raw material they could realistically / potentially extract from their permits?