Silica/Alumina % results

Hi all exciting times for this stock!

In relation to this part of the announcement:

" with average reactive silica of 6.8% (with a range of 1.8-10%) and with an available alumina grade, extracted by low temperature alkali leach processing, of 25.3% available alumina (range 20-31.7%), which, in accordance with bauxite rock samples previously tested by the company, is expected to significantly increase at high temperature processing."

How good/bad are these percentages? I have limited knowledge of what % of silica/alumina makes the ore a low/med/high grade. Does anyone know where these results stand in relation to how enriched this ore is? Thanks and good luck all holders!