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K 5103 (Suggenbad)
Entrance to an underground mine

The iron ore was already processed at the Mauracher Hof in Denzlingen in Roman times. It is possible that the ore originated around the Einbollen, where there are several iron ore deposits. Nine so-called Pingenzüge are scattered on the mountain. These witness to the fact that there was extensive mining in the past. The entrance to the tunnel in front of which we are located extends for approx. 40 m into the mountain and then ends.

In the mining industry, “drifts” are understood as a mine construction dug horizontally into the mountain, which offers access to the “Untertage” (underground) and to the deposits of valuable mineral resources suspected there. You are standing in front of such a drift, which is located on the border of Denzlingen. It can no longer be determined for sure when and for what specific it was dug. Since this part of the Einbollen is iron-bearing, it may have been dug into the mountain for the purpose of mining a lode, which was verifiable there. Iron ores were mined in the Suggental and probably also on the Einbollen, especially in the period from the middle of the 16th to the second half of the 17th century.

Further above the entrance of the drift there are, as the map shows, numerous “Pingenzüge” (a row of various “Pingen”). “Pingen” are funnel-shaped sinkholes located above a cavity and created by the mining industry. They could also have been created by trial excavations in places where the presence of minerals was suspected. In any case, the “Pingen”, which are unusually numerous on the Einbollen, are the result of intensive mineral research.