NPRN245049
Cyfeirnod MapSN85SW
Cyfeirnod GridSN8437051510
Awdurdod Unedol (Lleol)Powys
Hen SirBrecknockshire
CymunedLlanwrtyd Wells
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Disgrifiad
A rock-cut adit, associated with Nant-Y-Brain mine, c. 2m high and 1m wide, with bank of excavated material to north of entrance. Now filled with water, and fenced off within boggy and scrubby enclosure.

Helen Whitear and Duncan Schlee, Dyfed Archaeological Trust, 2008.