The 18th-century quarry, developed significantly from the 1840s, expanded operations in the 1860s with the construction of the Rhiwbach tramway, reaching a peak output of over 8000 tons in 1869. The site includes various remains, such as inclines, mills, dwellings, and underground chambers, showcasing the quarry’s history and layout, with notable features like the sheave mounting, ruins of the main mill, and traces of the ‘new’ workings to the south.

Gated.
http://caveaccess.co.uk/rhiwbach.html