Kilianstollen Marsberg, Mining adit in Marsberg, Germany

Kilianstollen is a mining adit in Marsberg that extends roughly 380 meters into the mountain. The system shows three connected mining areas, where visitors can still see the dark brown and reddish rock formations that came from copper, manganese, and iron ore deposits.

The first record of this adit dates back to 1842, when miners opened it to extract copper ore. Over the following decades, this site became a center of regional mining activity and shaped Marsberg's economic development.

The name Kilianstollen refers to Saint Kilian, patron of the Franconian mission, though the sources do not explain the choice. Since 1984 the Marsberg Heimatbund has run the former copper mine as a show mine, with guided tours from April to October. Visitors also pass the Heilstollen, opened in summer 2013 a few metres inside the mine, where the air at 10 °C and 98 % humidity is nearly dust- and allergen-free.

Access is limited and only with a guide to ensure underground safety. Visitors should bring sturdy shoes and a jacket, as it is cooler inside and the ground can be wet.

The adit lies a few metres from the Heilstollen Marsberg, opened in summer 2013, where the air at 10 °C and 98 % relative humidity is almost dust- and allergen-free. The same passages also expose Upper Devonian to Lower Carboniferous rock in full sequence.