Tin, tungsten and lithium were mined in Zinnwald. The Tiefen Bünau adit was cut to drain the mines in the 17th century (1686). The Tiefe Hilfe Gottes adit was excavated in the middle of the 19th century. At the beginning of the 20th century, modern operating plant was built. These include the entry building at the Tiefen Bünau adit. The buildings and plant at Vereinigt Zwitterfeld, the Tiefen Bünau adit and the Tiefen Hilfe Gottes adit are currently used as visitors’ mines.