Extensive mill area. Short adit to pit with remains of dressing shed. Deep adit, which may be open to bottom of pit.

Clogwyn y Gwin Slate Company Ltd registered in 1879, dissolved < 1916

During 1880s, a short upper tunnel brought slate to and extensive dressing area. An incline then took finished product down to a sidings on the NWNGR.

During the 1920s, slates were dressed in a small dressing shed within the pit. Finished slate then taken via the bottom adit and a short aerial ropeway to the railway.

Take the path from Rhyd Ddu towards Glanrafon. After the path crosses the railway, a slatey path climbs up on the right towards the quarry.