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
Oakeley quarry is a slate quarry in the town of Blaenau Ffestiniog, north Wales. It was the largest underground slate mine in the world, and had 26 floors spanning a vertical height of nearly 1,500 fe
The disused main incline from Oakeley quarry to the Ffestiniog Railway in 1977
The 1839 incline connecting Holland's Quarry with the Festiniog Railway at Dinas
A 1990 view of Gloddfa Ganol showing the modern open-cast working
The remains of the Welsh Slate Company's incline connection with the Ffestiniog Railway