Possible mine shaft or other mining associated feature or trial excavation sited on spur of hill. Feature orientated east - west (total length c. 10m), with circular 'shaft head at east end (c. 5m diameter), and linear extension to west (c. 5m length). Earth embankment (spoil from excavations?) along northern edge of feature.
Helen Whitear and Duncan Schlee, Dyfed Archaeological Trust, 2008.
