An incline from Moelwyn slate quarry emerges from the base of the Stwlan dam (c1963) and terminates next to the footings of this small slate mill. It was probably built in the 1860s, using local rock rubble rather than slate. It contained six saw benches and seven dressing machines, driven by a 40ft (18.9m) diameter by 4ft (1.2m) wide waterwheel in a pit on the north side. There was a small stacking area to the east by the exit tramway, and a building to the west which may have been an office and store. The very small tips of trimmings testify to very small production at this site,
W J Crompton, RCAHMW, 30 July 2009.