Nantlle is a small village in the slate quarrying Nantlle Valley in Gwynedd, Wales. It lies on the north shore of Llyn Nantlle Uchaf and is part of the community of Llanllyfni. The population was 228
Diphwys Casson quarry was a major slate quarry in the town of Blaenau Ffestiniog, Gwynedd, North Wales. It was one of the major users of the Ffestiniog Railway.
The remains of the main Diphwys Casson mill
Method used for underground slate quarrying in the Blaenau Ffestiniog region