Thank you everyone who has replied :thumbsup:
SimonRL - That is indeed the adit that I found 🙂 Thank you for the additional description, those other mines look equally as interesting, it's a shame there aren't enough hours in a day it seems.
Royfellows - Thanks for all that information, I have walked through some of the local slate mines and have enjoyed them, it is the underground element that I am keen to explore though, adds another element to it I suppose 🙂
Do I understand it correctly, that this mine is split into three levels. The "Deep Adit" being the lowest one, which has the "portal" (or entrance, not sure what term is best used here) which is flooded and which I have already found. Ross's Engine Shaft being the means of abseiling into the mine, which provides access to all levels (?). Middle Adit and Upper Adit are more self explanatory I suppose 🙂
Would you have the grid reference/position for the Engine Shaft available? I fully intend to try and seek it out myself, as I feel like I'm cheating if I only use positions to gain entry to the mines 😞 But it would be nice to have when/if I get desperate 😉
Rufenig - Thanks for the link, I shall look at getting a copy of that book, regardless of it's practical use It sounds like interesting reading nonetheless :thumbup:
Again, thank you all :)
Bryn