Small underground working. Adit collapsed.*

Ruins of the dressing sheds remain near the adit site. Slate waste is visible around Pont Sion Goch. Three trial adits lie on the hillside above the workings.

A small late-period underground working dating from around 1866–68. Operated without mechanisation, with hand dressing carried out in shelters beside the adit. Employed about 12 men, though annual output was only around 40 tons. Finished material was taken out by cart track to the Croesor Tramway at Pont Sion Goch.