1. Balance shaft, part of Pwll-du Quarries (nprn 85859).
Source: Cadw Industrial Landscape Survey.
2. A building of coursed stone c3 x 5m containing a shaft, built into a corner of the quarry. The superstructure stands up to 4m high to the rear and 1m high to the front and sides. A tramroad runs up to it (34965). Site visited, 2000.06.15/H&H/WH.