I am not too sure about the access arrangements as to where is this locked gate??? The adit that once came out on the dressing floors has been collapsed in (but access may still be possible by removal of stones in a hole in the drying rooms) Jope's adit is running / flooded. The only access I can think of is Kittow's adit up the top. I have ventured into this adit, the entrance is slightly collapsed but passable, once inside it is slightly flooded (approx 12") but then rises up to dry ground, I only adventured in a little way as far as a shaft leading up. I am planning to go further next time when I will be accompanied by experienced person armed with head lamps, not a torch.