Cadeby Colliery upcast shaft (site of).

This is the site of the former Cadeby Main Colliery near Conisbrough, in South Yorkshire. Shaft sinking commenced in 1889 and the mine worked until 1986. In July 1912, two explosions within hours of of each other killed a total of 88 men. The concrete monolith marks the position of Cadeby upcast shaft. There is a similar monolith a short distance away to the east, marking the position of the downcast shaft.

The disused buildings of The Earth Centre are just visible on the skyline, left of centre.

Flickr member loose_grip_99 has a photo of Cadeby colliery in 1976 here:
www.flickr.com/photos/loose_grip_99/163184624/