12 ก.ย. Susa Wikipedia
Just after the right webpages are discovered, tunnels was excavated regarding the stone to eliminate the brand new vein. Narrow straight shafts have been driven through the material, broadening out over horizontal galleries where the ore is actually found. Operating underground, the fresh miners suffered with the necessity for lights and you can the risks from terrible venting. These old exploration procedures remain position, although some features folded.