Mining activities in the area initially focused on the productive Westminster Vein, with the Nant Mine extracting ore from the western end of the vein. Ellis’s Shaft, located at SJ 1980 5768, is capped with concrete and includes an air vent.

The Engine Shaft, a rectangular stone-lined structure, was sealed as part of the 1978 shaft capping program by NKC Partnerships. The shaft measures 2.1 meters by 3.4 meters and is situated south of the engine house.

Various shafts are located along the Westminster Vein to the west of the Nant Engine Shaft, including shafts at SJ 1925 5780, two adjacent shafts at SJ 1930 5780, two more adjacent shafts at SJ 1935 5770, and single shafts at SJ 1950 5775 and SJ 1960 5775. The most westerly shaft on the vein was an old whim shaft to the north of Bryn-y-gloch. To the east, the Castell Engine Shaft near Castell Farm remains visible. This shaft was used to pump water from the New Shaft, which is marked as a whim shaft on the abandoned mine plan deposited at CRO.

The mine workings were drained by the Nant Adda Level, with the portal located at SJ 1874 5798. The Grosvenor Caving Club has gained access to the underground workings and reports that artifacts still remain, potentially offering insights into historical mining technology.

Regarding the transport infrastructure, there is no evidence of specific transport features related to the mine. The Grade II Listed Pumping Engine House, located at SJ 1977 5774, is an important historical feature. It was constructed in 1841, as indicated by the inscription on the sandstone arch over the doorway. The engine house survives to a height of about 7 meters and is built from local limestone with dressed stone quoins. Some timber lintels and beam ends are still in place, while the large rear doorway, which once served as the cylinder opening, is now blocked with brick. All windows are sealed, and there are signs of rendering. Although fallen stonework has obstructed a full examination of the interior, the structure remains in good condition.

Ellis’s Shaft is believed to have been a ladder shaft. The Castell Shaft Pumping Engine seems to have served both Castell and New Shafts, with New Shaft being a whim shaft. A circular stone chimney, approximately 8 meters tall, is located uphill at SJ 1990 5775. The chimney, built from stone, has a flue leading downhill to the engine house.

Large areas of waste and dressing tailings are found at SJ 1985 5760, situated on the edge of a limestone escarpment extending toward Graig Quarry’s old workings. This area extends southeast from Ellis’s Shaft. The area surrounding the Engine House is covered with spoil heaps from dressing operations, while the dressing floor is partially bulldozed and partly grassed over. To the west of the Engine Shaft, fallen stone may indicate collapsed ore bins.

Other significant features include concrete and stone structures south of Ellis’s Shaft, which may relate to later quarry activities, possibly the base for a hopper. West of the engine house, a rectangular stone building remains, with walls surviving to a height of 1 to 2 meters. A derelict stone cottage to the north of the engine house is likely the former mine office, located at SJ 1980 5775. Three cottages stand uphill and to the right of the chimney at SJ 1985 5765. Additionally, a stone revetment wall runs along the right side of the road leading from the chimney to Eryrys, at SJ 1980 5775, linking the engine house site to the nearby waste areas at SJ 1980 5770.