Slime tank associated with Dyfngwm Mine, on S bank of Afon Clywedog. Earthen and rubble banks, 20m NW-SE x 10m NE-SW. Natural ground to upper SW side; outflow in E corner to a 2nd tank (NPRN517389). Part of the revival of Dyfngwm by Hirnant Minerals Ltd 1931-35.
Recorded as part of RCAHMW Uplands Initiative Project. W.B. Horton, H&H, 11/11/2011.