"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
"Minerals recovered from rocks excavated during the construction...
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