"Rich" means high concentration of lithium in ore. This deposit does seem to be top 1 in that measure, 4.68%. For comparison, Greenbushes, THE lithium mine in

"Rich" means high concentration of lithium in ore. This deposit does seem to be top 1 in that measure, 4.68%. For comparison, Greenbushes, THE lithium mine in West Australia, is 1.60%. Note that Greenbushes is actually famous for its high concentration. More typical is Mt Cattlin at 0.50%. This deposit is 3x richer than Greenbushes and 9x richer than Mt Cattlin, which is in fact astonishing as the article says.