Pit accessed by adit. Tramway.**

Open workings are accessed via an adit driven in from below. A surviving tramway formation remains, with lengths of rail still lying on the ground. The water-powered mill at SH723542 contains a small forge hearth, remains of a sand saw, plummer blocks in a rear room, and two lean-to structural additions. At least one surviving 7-inch sand-saw blade is present, along with fragments of others. Tip heaps contain substantial quantities of reject hones.

Worked intermittently from the mid-19th century to the First World War. The workforce was typically small, usually fewer than six men. Stone was carried by tramway to a water-powered mill equipped with a sand saw and possibly a polishing machine. Some machinery was relocated from Melynllyn in 1908. Finished hones were carted to Capel Curig for dispatch.