Robbie
Google
This place is a great attraction, the whole experience was very enjoyable. We visited on a Sunday mid September and it wasn’t overly busy. The staff were really nice, friendly and talkative. The layout from the car park, shop/entrance to the mines is well laid out.
When you go into the attraction you get a hard hat and can take your time going through the experience, roughly 40 minutes to an hour but there is no rush. There is lots of history and information about the history of the mines and people that worked there and it that was fascinating to read, there is a short video presentation you can choose to watch which gave more insight into the history.
You get to walk round the open quarry site and venture into the mines. It’s a self guided tour/walk and as others have stated and I’ll confirm it is narrow with low ceilings in places, this adds to the experience in a good way (unless you’re claustrophobic).
There is lighting in the mine which highlights the natural features, but I would advise a good torch to see into the dark areas not lit, not necessary but again this added to our experience in a good way.