Pen-yr-Orsedd Quarry
Gwynedd, United Kingdom · built 1862
Pen-yr-Orsedd quarry was a slate quarry in the Nantlle Valley in North Wales. It was one of the last slate quarries operating in North Wales and the last operating in the Nantlle Valley area, finally closing in 1979.
Mine data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).