Lead (1846-1880) Geology: The workings are on a branch vein of the main NE-SW lode in Nant Y Gwrdy. Exposure of the vein here displays a quartz brecciated gangue in rocks of the Silurian Frongoch formation. Workings: Four shafts (SN83158506, SN82988501, SN82868499) and an adit (SN82818505). The earlier engine shaft is drained by an adit crosscut with extensive stopping above adit. A second shaft was sunk in 1879. Transport: No evidence. Power: A reservoir on Nant Y Gwrdy at SN83138521 drove the dressing floors to the west. Processing: In 1874/5 a self acting dressing plant was installed on the dressing floors SN82698510 but this is now almost totally destroyed by clearance for farm buildings and parking areas. Other features No evidence (CPAT 1996). No further information . R.S. Jones, Cambrian Archaeological Projects, 2004