99.99% is referred to as 4N, 99.9999% would be 6N
Feldspar and Silica are the other two bi products, pure silica being worth about $2500 per ton, Feldspar, about $600 per ton. The company has never released assays for these so I am not sure there is enough of this stuff to be a worth while economic consideration.
I do believe that Li ion battery market is where we will be a good fit and can maximize our revenue. If however, we qualify for the nuclear graphite market, then the Li ion battery will have to settle for our scraps lol.
G.