Compound	yield of the treatment performed (η)
Compound	Sand sample of Maféré
Silica	η_(silica) = [T_{(silica)MAF,1} − T_{(silica)MAF,0}]/[100 − T_{(silica)MAF,0)}] × 100
Iron oxide	η_(iron) = [T_(iron)MAF,1 − T_(iron)MAF,0]/[0 − T_(iron)MAF,0] × 100
Alumina	η_(alumina) = [T_{(alumina)MAF,1} − T_{(alumina)MAF,0}]/[0 − T_{(alumina)MAF,0}] × 100