Hi High Pit Wilma,
Thanks for that - I think you're right - looking at an old aerial photo of the colliery (although most of the building I'm interest in is hidden behind the headgear). The westernmost part of that building which was left onsite following the closure of the colliery was the winding house (almost identical to the one still standing at Earsdon - Fenwick Colliery), the boiler chimney behind that and other associated uses in the attached building behind including (as you stated) baths, equipment storage etc. - although the baths weren't opened until 1951.
However, I'm more interested in what the use of this building was after the colliery closed (see attached with red outline of the building left after the closure of the colliery and which was demolished some time after 1977. This is now on the site of the first unit on your right when you enter the industrial estate (previously Elite Car Transport Ltd). This is the building which is shown as "works" on the earlier map.
Cheers
Gary