https://www.dailypost.co.uk/news/north-wales-news/renowned-gwynedd-tourist-attraction-goes-19831242

Details don't seem to have been uploaded to the estate agency's website yet.

He's done well to have made a success of it. It is a little off the main tourist track even now and it certainly was 30 years ago. We (TL Mining Ltd) spent a couple of months creating the canal and other features, as well as some safety work. The second exit took a bit of sorting out. An interesting job. Glad it's still going.