Once covered by a meter-thick layer of pumice, the 1,700-year-old tuff tunnels and shafts are now protected under the cantilevered hall construction of the Meurin Roman mine. The original traces …
Between 1627 and 1858 the tuff in the Krufter Bachtal was mined by underground blasting, which is evidenced by boreholes in the walls. The definition of the period is based …