Knappa Gruaba

The depressions in the slope mark former adit entrances. An adit is a nearly horizontal passage from the surface in a mine. The hills with flattened tops are dirt pits of barren rock. Each of the pits can be correlated with one adit entrance. The landscape of dirt pits and adit entrances developed during the climax of the mining activities at Bartholomaeberg between 1000 and 1600 AD.