Exploration targets, page-15

"Minerals recovered from rocks excavated during the construction of the tunnel in the early 1970s. At distances of 335 m and 500 m south of the northern entrance, mineralizations similar to those in the gold mines near Schellgaden were found."

https://www.mindat.org/loc-56907.html

Below: styles of mineralisation at Schellgaden gold mines - also found at A10 tunnel during excavation.


Above: Celestine

Below: Sphalerite


Below: from HGM presentation a few months ago