Pit with various remains.**

This remarkably diverse site retains numerous structures, including a well-preserved row of dressing sheds and an engine house with its chimney still intact. A stone-lined pump shaft, measuring roughly two meters square and containing surviving pump rods, can be found on the site. Evidence suggests the haulage incline operated using water power. Next to the engine house lie the firebox and boiler from a semi-portable steam engine, while elsewhere the remnants of a wheel pit and a separate chimney—which once served another engine and winder—survive, though much of this has been quarried away. The original engine and winding installations from around 1870 were superseded in the 1890s by the current engine house. Near the pit are foundation bases that may have supported a Blondin aerial ropeway. A well-constructed access road provides the approach to the quarry.

Operations commenced in the 1860s as part of the original Ty Mawr quarry, which ranked among the largest slate workings on the valley’s southern slopes. Before steam power arrived, water may have driven both the haulage system and pumping equipment. By 1882, approximately twenty men were employed at the site, though output remained modest at just one hundred and fifty tons annually. The quarry never gained a railway connection and ceased production around 1910.