One shaft, appearing to be concrete-capped, is located at SJ 0610 8040. The opencuts at SJ 0640 8040 are associated with stone quarrying. Along the Mineral Railway, several adits have been blocked off, cutting into the northern and western slopes of Graig Fawr. Additional levels are identifiable up the western slopes near the main Talargoch Mine site (SJ 0590 8060). The south-west side of Graig Bach is also covered with open-cut workings, notably the China Rake. The Mineral Railway runs along the contours of a 1750s leat, which traces the lower slopes of Graig Fawr on its western side.

Graig Fawr, a limestone hill, is likely the site of very early mining activities. Earthworks on the site include open workings and small shafts, which follow veins running from north-east to south-west. Smith (1921) describes a haematite and copper lode cutting the hillside. The opencuts on the hill suggest 18th-century or earlier activity. The China Rake, crossing the southwest side of Graig Bach in an east-west direction, is an early, probably hand-worked feature.