In reply to Nick Allan: I think all the 'restarted industrial works' are just taking out already blasted stuff for road balast, they didn't work on Sunday so with a low profile you still could climb on Sundays.
However I would stress that this was a bit pre 2009 and some of the routes had had their bottoms mined out so the bolts were a bit high. Pay a visit and let us know how you get on, it's a great crag.