Directly to the north of the Grüner Seifen placer deposits is the Heiliger Geist and St. Bartolomäus sink-hole field. It is marked by long, crevice-like sink-holes caused by collapsed mining shafts. In some places, these sink-holes run parallel to each other at a distance of only 5 metres. The sink-holes are up to 5 metres deep. Further to the west, the sink-hole field changes into a surface-mined area about 8 metres deep and 100 metres in diameter.