The silver extraction in the mines it occurs as follows: First of all, it is prepared to dynamite the area, be it in front or to Sky. The dynamite is connected to a wick whose name is "thermalite". Said wick has two capsules or terminals; one of them allows the fuse to be lit, while the other detonates the explosive.
· This process is known as roasting. The carbonate ores are changed into oxides by heating strongly in limited air. This process is known as calcination. The chemical reaction that takes place during roasting and calcination of zinc ores can be shown as follows – During Roasting, following reaction takes place: