The Dyfngwm Mine is located on the western extreme of the Dyfngwm lode, which consists of Lower Silurian shales with sphalerite, galena, and chalcopyrite mineralisation.

Engine shaft open and dangerous. Whim shaft run in. Remains of deep adit and various trials.

Mining operations at the site were extensive, with evidence of multiple shafts, adits, and infrastructure to support extraction and transportation. In 1878, skip-roads were installed to facilitate the movement of ore from the shafts, and their remains are still visible on the spoil heaps. A transportation route extended eastward from the mine above the River Clywedog toward Dylife, which has since become part of the Glyndŵr’s Way public footpath.

The mine includes a large engine shaft at SN 8336 9306 and a whim shaft at SN 8330 9311. Other notable features include a deep adit, an air shaft at SN 8387 9311, and several short and shallow level trials, some of which have resulted in surface subsidence. Large spoil heaps are present in proximity to the shafts, marking the scale of excavation that once took place. Numerous leats were constructed to provide water for mining operations. One leat, originating from the Nant Ddu stream, supplied water to the crusher house, while another extended southward for over a kilometre from the upper reaches of Nant Goch at SN 8355 9406. This second leat followed the 467-metre contour, discharging into Nant Ddu above the pumping wheel pit via a stone-lined channel. It is likely that this feature was designed to supplement the main water supply during periods of drought. A stone culvert, used to divert water from Glaslyn to the reservoir, remains visible at SN 8320 9430.

Water played a significant role in powering the mine’s operations. A large earthen dam, located west of the site at SN 3109 325, supplied water to Dyfngwm Mine and may have also been used by Cyfarthfa. A pumping wheel at SN 8349 9305 drove a system of flatrods that transmitted power to both shafts. The alignment of the flatrods leading to the northern shaft is still discernible as a low earthwork gulley, while an angle bob pit and its surrounding wall remain intact on the eastern rim of the engine shaft at SN 8330 9316. The pumping wheelpit itself is well-preserved. A horse whim was employed at the northern shaft, with the overgrown whim circle still visible to the northeast of the shaft. The crusher house was powered by a large waterwheel, and while modern farm buildings have been constructed onto its front wall, the original wheel pit and crusher roll housing remain in good condition.

Although the crusher house at SN 8369 9301 has survived, much of the infrastructure associated with the dressing floors has been lost to modern agricultural activity. However, some remnants of the site’s ore processing operations persist. South of the agricultural buildings, traces of slime settling tanks and other stone foundations are still visible. Ore bins and a picking and washing floor remain near the Whim Shaft at SN 8330 9317, providing further evidence of the site’s industrial past.

At the western extreme of the site, a square stone building with a partially intact collapsed south wall stands at SN 8323 9319. The purpose of this structure is unclear. Nearby, a large triangular enclosure at SN 8325 9319 is marked by a low earthen bank, measuring one metre wide and 0.40 metres high. A possible entrance is visible on the western side, and a stone-lined culvert crosses the enclosure from northeast to southwest. Additional buried structures are evident on the southern side, though their function remains uncertain.

Close to the engine shaft, a complex of mine office buildings includes several storerooms and possibly a smithy at SN 8342 9310. Nearby, two groups of house platforms, which likely predate the mining activity, retain partially intact basal wall foundations. These platforms are situated near leat systems, though this may be coincidental. The first group at SN 8365 9331 consists of at least two building platforms adjacent to a short eastern branch of the main leat carrying water from Nant Goch to Nant Ddu. The second platform, at SN 8376 9331, consists of a rectangular stone foundation with a single eastern doorway. An associated enclosure lies to the north, with possible traces of cultivation beds visible in aerial imagery.