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Natural Monuments

North Rhine-Westphalia

Cologne District

Bergisches Land

Rheinisch-Bergischer Kreis

Lüderich mine sewage sludge dump silted up

Natural Monuments

North Rhine-Westphalia

Cologne District

Bergisches Land

Rheinisch-Bergischer Kreis

Lüderich mine sewage sludge dump silted up

Highlight • Natural

Lüderich mine sewage sludge dump silted up

Hiking

4.8

(92)

This Highlight is in a protected area

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Naturpark Bergisches Land

Location: Overath, Rheinisch-Bergischer Kreis, Bergisches Land, Cologne District, North Rhine-Westphalia, Germany

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Tips

July 7, 2025

Hiking

A true idyll! Yet, this area was a DUMP for toxic sewage sludge until 50 years ago. The 50 m high dam was built over the long-closed Grünewald mine. Behind it, huge amounts of sewage sludge from the LÜDERICH lead and zinc mine, which lay on the other side of the Sülz valley, were finally disposed of. The sludge was pumped into the basin via an 800 m long pipeline across the Sülz valley. The pumping station in the valley can still be seen today.
de.wikipedia.org/wiki/Grube_Gr%C3%BCnewald

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March 23, 2023

Hiking

The ponds are former clearing ponds of the Grünewald pit, a non-ferrous metal ore pit in the Bensberg ore district. In 1905 the operation of the pit was stopped and the ponds were left to nature.

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Details

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Elevation 190 m

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Monday 28 September

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Location: Overath, Rheinisch-Bergischer Kreis, Bergisches Land, Cologne District, North Rhine-Westphalia, Germany

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