Blaen y Cwm Quarry
Conwy County Borough, United Kingdom
The Blaen y Cwm quarry was a slate quarry located east of Blaenau Ffestiniog in Wales. It was first worked in some time between 1813 and 1818 and sporadically after that until 1914. The quarry was connected to the Ffestiniog Railway at Duffws Station via the Rhiwbach Tramway.
Mine data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).