A true idyll! Until 50 years ago, this area was a landfill for toxic sewage sludge. The 50-meter-high dam was built over the long-disused Grünewald mine. Behind it, huge quantities of sewage sludge from the LÜDERICH lead and zinc mine, located on the other side of the Sülz Valley, were permanently stored. The sludge was pumped up into the basin via an 800-meter-long pipeline across the Sülz Valley. The pump house in the valley can still be seen today.
de.wikipedia.org/wiki/Grube_Gr%C3%BCnewald

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Isi-Sicilia

March 23, 2023

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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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Elevation 190 m

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Thursday 26 March

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

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