A small lead mine located in the lower Clettwr valley, on its north side, above Tre'r-ddol. It was apparently being worked in 1940 when a lower adit (at NGR) had been driven north-north-east from the stream to intersect two narrow east-west trending lodes approximately 2m apart, about 50m from the portal. The lodes, which carried galena, chalcopyrite and sphalerite, had been followed some 50m to the east. An upper adit, 20m upstream, had intersected a third parallel quartz-galena lode about 10m from the portal (1).
Air photos show what appears to be waste material immediately north of the mine above the stream cutting, at SN 67809178.
The mine does not appear on the early edition Ordnance Survey 6-inch and 25-inch sheets, or on the post-war national grid six-inch sheet.

(1) R.Cave & B.A. Hains Geology of the Country between Aberystwyth and Machynlleth. (British Geological Survey 1986. London HMSO), p.131.

David Leighton, RCAHMW, 3 October 2012