The mount is a method of pharmamothalurgy where the sulfide ore is heated below the melting point inside air presence overload During the process, water vapor and volatile impurity (such as SO2 and As2O3) were released. Examples on the gold ore of arsenopyrite (FEASS) as are in Gorontalo (Black Stone):

2 FASS + 5 O2 → Fe2O3 + As2O3 + 2 SO2

As a result, gold is more easily separated because the sulfide matrix has been oxidized.