Ann: Numerous Intersections of Spodumene-Bearing Pegmatites, page-12

Some of the results are impressive, e.g. MRC04, 35m of 10%-20% spodumene.

But many are not that rosy. For quite a lot of the intersections, the spodumene content is less than 10%, and shall be considered low grade. By definition (quoted from some geologist), "Spodumene is the main lithium-bearing mineral in the world, and its theoretical Li2O content can reach 8.03%". So even if we take this max value for calculation, the lithium oxide content for those intersection is 10%*8.03% = 0.803% Li2O, still falling out of the grade which has economic value for mining.

Just my simple math, correct me if I'm wrong.