I simply had to go back to the derelict Mine Manager’s House in Bonmahon ~ what I think of as The House on the Hill ~ as there were so many unanswered questions after my last posting. The interaction associated with blogging is certainly one way to keep one’s mind moving!
It’s the back of the house that one sees from the road:

I was determined to get to the front and see how it looked from there. I still can’t figure out where the main gate to the house is/was but I crawled through a load of thorny overgrowth and came to the front which rather took my breath away:

There is a lot of ground in front of the house and it felt like no one had been there since the front door was finally boarded up years ago.

As for the ‘fire place’ round the back, there is definitely a space that could have housed a chimney – albeit a rather narrow one.

As the little plaque notes, the Mine Manager’s house had a good view of the works going on in the area below it:
This is a view of how the area looks these days:

Many thanks for asking all the questions that you did about the original post and generating my curiosity to go back and take another look at a house with a history.