The slate quarry is near to the Craig Goch reservoir in the Elan Valley, not far from Rhayador in Radnor. The photo above shows the dam, one of several made in a series of reservoirs which were constructed during the latter part of the 19th century and opened by King Edward VII and Queen Alexandra on 21 July 1904.
Shut down during the early to mid seventies, the quarries in Wales were mostly left undisturbed. I visited this one in 1976 and, because it was such a long time ago, I can't really recall it's exact position. I took some photos on slide film and, again, because of the length of time, they have deteriorated and the quality isn't that great, so apologies for that. However, I've recently bought myself a new toy for Christmas...a slide and negative scanner, so I couldn't resist adding this to my site visits.
In the photo below is what looks like the housing for a pulley system.
There were several derelict buildings, but it's hard to tell (in hindsight) as to which were works buildings, housing for the manager, or even for the quarry workers themselves.
These, together with a couple more photos, can also be seen in the Photo Gallery album.