1864 - First drift named Tower was
started on Hirwaun common
(named after the nearby "Crawshay's Tower") A folly
built in 1848.
1941 -
The present shaft was sunk (1941-1943) and is 160m
deep. This shaft is used as the main "return" ventilation
shaft and for the transport of men.
1958 -
Tower No. 3 new drift was driven to meet the No. 4
colliery workings and is used as the main "intake"
airway, conveying coal to the surface and transporting
materials into the mine working areas.