alumina1,

 " For the HPA Plant, even using only 3N silica is bringing significantly more revenue than scandium and gallium (almost 40x more lucrative - 12x using your $3/kg assumption - and it's there, ready to be processed a little further...).  I think scandium and gallium and REE processing ability are included in the HPA Plant mostly to validate & tune the parameters at full scale "

 

I meant as Glenn has stated, scandium and gallium unit being in production mid-2013 will very probably process more than just the tiny amount from the HPA ore leftovers, from outsiders, thus a very possible source of revenue, whereas on the silica side we have no news whatsoever, thus more speculative on the $$ side.

 

And about that scandium-gallium extraction unit, I find it hard to believe they won't include some REE extraction as well...