Pit.

Remains of the site include traces of several buildings. Two distinct wheel pits survive, likely representing different phases of power use. Launder pillars and partial remains of a reservoir—dammed in part by natural rock—are evident behind the site. A unique horse whim circle survives, identifiable by its curved screening wall.

Operated from around 1840, producing the same black slate as Coed Mawr. Early haulage used a horse whim for raising waste. Haulage and pumping were later converted to water power, and subsequently to steam. Output exceeded 600 tons in the early years; by 1882, six men produced 120 tons. Transport relied on carting down the valley.