A number of trips are possible, the two most interesting being the round trip via the two inclines and the cunning through trip to the huge chambers of Oakely. Cwt y Bugail SH734468 Partly underground quarry, some chambering of which is accessible. First large quarry to work in Ffestiniog. Modern untopping work has confused the site. Much underground work during the end of the 19th century.
Some adits are accessible.
Some untopping work and a collapse reveal underground chambers. Well known underground quarry operated both as a show mine and a working quarry. Maenofferen SH714465 Underground quarry. Manod SH732455 Underground quarry. Used for art storage during WW2 and by DDE until 1980.