Ystumtuen Fach (near Cwm Rheidol since there are two mines that had the same name during a period in the area, the other being Powell Mine near Llywernog).
The site can be reached ny following a steep forestry track up from Dol cottage in Cwm Rheidol, into Coed Penhriw wood. An overgrown tip below the track near the top marks the site of the now run-in adit portal, where either an air-shaft or a recent collapse leads into the adit from above.
Above the track is what looks like another adit portal, also run-in.