Hillside workings on several levels with a number of inclines. Remains of drumhouses and water power. Some underground extraction.***

The mill area has been landscaped; only two small buildings and part of one mill remain. Inclines serving lower terraces are degraded, but one drum house and a revetted tramway formation survive. A prominent slate-paved table incline brought blocks from the upper working to the mills and doubled as up-haulage for lower working rubbish. Near the incline head are a waterwheel pit, formation for balance tank conversion, a fine accommodation arch, header tank structure, wooden launders, and fabricated pipe.

The upper working contains four inclines in good condition, some with drums and one with remnants of a wooden bridge, plus vestiges of older inclines. An intermediate level contains parts of a tripod crane and a trial adit. Other buildings include a hydro-compressor house with piping. Llyn Penrhiw provided the water supply. Quarry-owned village housing survives, including several rows of single-storey cottages, some still occupied.

In operation without interruption from 1818 or earlier to 1962. Employment reached upwards of 100 men up to World War II; closure was due to lack of skilled manpower. Three mills operated successively: waterwheel, turbine, and internal combustion powered. Material was carted to Trefriw wharf, later to Betws y Coed station. Transport evolved from horses to traction engine, then steam lorry, motor lorry, and from 1948, a diesel locomotive on the Moel Marchyria rail link. The post-World War II workforce comprised 75 men, maintaining over half of pre-war numbers of 108.

Open