Bruchstrasse colliery!

This colliery was first mentionned in 1796 and produced coal until 1962, in the last years nearly half a million tons per year. The deepest level was at -933 metres.

(Source: Huske, Joachim: Die Steinkohlenzechen im Ruhrrevier, 2. überarbeitete und erweiterte Auflage, Bochum 1998).