Penmachno quarry, Slate quarry in Conwy County Borough, Wales
Located at the head of River Machno valley, Penmachno quarry features galleried pits and underground chambers across five main veins of Ordovician slate.
The quarry operated from 1818 to 1962, reaching its peak production in 1898 with 178 workers extracting and processing slate materials.
The slate from Penmachno quarry contributed to the construction of the bardic chair for the 2019 National Eisteddfod of Wales in Llanrwst.
The quarry sits at 330 meters above sea level, with limited water supply that occasionally affected its operations during drought periods.
Unlike other Welsh quarries, Penmachno transported its slate by horse-drawn carts to Trefriw's River Conwy wharf instead of using railway connections.
Location: Conwy County Borough
Elevation above the sea: 330 m
GPS coordinates: 53.00439,-3.86286
Latest update: March 5, 2025 10:58
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