mindfree, good question, very important one indeed. I think the REE/RM content is a much harder thing to specify at the moment, since even in Grande-Vallée the % is too low to even be considered other than by-product. It would have to be evaluated though since in the Grande-Vallée case the economics of these by-products are so important.

If you remember, they had not even identified them before they got the acid concentrate from regeneration.

 

But then again, the silicate sand may also be a very potential source of revenue...