Small pit accessed by tunnel.

Compact site comprising two principal excavations served by tunnels. The upper (main) quarry is arranged on three levels: the top level consists of an open cutting representing the original 1825 trial, with tips that have engulfed the remains of the Bryn Fferam smallholding; the second and third levels are pits accessed and drained by tunnels, marking the working of successive areas. The lower and later tunnel, now run-in, lies in a neatly walled cutting. At its outer end stands a hut containing the concrete base of the 1920s oil engine, built within the footprint of an earlier smithy. Adjacent to this is the 19th-century production area, identifiable by a long wall topped with a cantilevered slab parapet constructed to protect against the prevailing wind.

There is current day reworking for bulk material.

Brynfferam Slate Quarry opened in 1825 as a small pit working with two excavations accessed by tunnels. During its early years, the quarry experienced numerous setbacks and speculative ventures, struggling to establish stable operations. By 1883, it recorded an output of 252 tons with 18 men employed, though production was typically about half this figure. The quarry closed in the early 1900s but was reworked in the 1920s, during which time an oil-engine-powered saw was installed. It was reworked once more in the early 1950s before final abandonment. Throughout its operational life, Brynfferam had no rail connection, and all material was carted to Fron Quarry for transport.