1. Remains of building in small stream valley, amorphous rubble heaps with no structural form visible. 6m x 10m, 2.5m high with adjoining heap 3m x 5m, 1.5m high. It has been suggested this is the site of a horizontal or Norse mill. The structure occupies the small base of the Darren Ddu valley and water is audibly flowing at depth under the remains (could be a buried wheel pit). Current stream course probably later - naturally found its way round the rubble. Immediately downhill the valley is choked with stone - giving the structure an artificial platform. For later reuse as probable ford see nprn 243287.
Anne C.K.Roseveare, Archaeophysica, 26 March 2008.
2. See article in Melin, the Journal of the Welsh Mills Society, vol 15 (1999): Phillips, Neil, 'A suggested horizontal or Norse mill site at Darren Ddu, Mynydd Llangynidr, Powys', pp.16-24.
B.A.Malaws, RCAHMW, 25 July 2013.