Thanks for the responses, will certainly have a look into these!
The thought behind it is to try and find an appropriate use so that there is reason to preserve the buildings that are a key part of the history of the slate industry in Wales. The remoteness of some of the sites is really interesting, it could be seen as both a positive and a negative, I for one think that the seclusion of some of the sites is what makes them so beautiful. you definitely wouldn't be allowed to build new structures where some of the ruins are!