I remember back during the early 1990's both engine houses had scaffolding round them, whilst work was done to them. I wish I could find the pictures I took from the scaffolding all very impressive. I also remember the bob stools being lifted by crane and placed back on the bob wall. If my memory serves me, both (Stools)were stored at King Edward Mine.
Yes there was a pumping house (south west water) on the shaft which was concrete and demolished about the same time.
The 90 inch beam engine was transferred to New Cooks Shaft (South Crofty) where it continued to work until the 1950's - the breakage of the beam is well documented elsewhere. Part of the top of the cylinder has been located on the South Crofty site and is now lying next to the Blacksmith's shop. I do my best not to hit it when I park there every morning.
If it can't be grown it has to be mined.