(Grube Silberkaule, Heckhaus, Engelskirchen, Bergisches Land, Nordrhein-Westfalen, Deutschland)
Ancient lead and copper mine (closed in 1896), of which some large dumps remain. The main ore was argentiferous galena.
Located on Heckberg hill near Heckhaus, about 4.5 km south of Engelskirchen.
Ref.:
- S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990