'Prosperberg'
Production at shaft II in Bottrop was stopped in 1974 when Prosper merged with the mine imperium of the Haniel family (hence the new name Prosper-Haniel). The mine complex itself was preserved. Since 1988, the duo of the brick tower and the metal headframe has been protected as a monument.
Other pits at Prosper-Haniel remained active much longer, such as the 'Prosperberg.' In 1984, a tunnel of more than 3 kilometers long was drilled at this location, ultimately leading to the mine veins 786 meters underground. A conveyor belt ran through the shaft of Prosper Förderberg that brought the coal above the ground, and miners could descend into the underground using all-terrain vehicles.
The Prosper-Haniel mine was active until December 21, 2018, when coal production in Zeche Frans Haniel from the Prosper-Haniel mining group ended in the presence of German Federal President Frank-Walter Steinmeier.