Publications (2)
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
- Richards, Alun John, (1999); The Slate Regions of North and Mid Wales and their Railways; Gwasg Carreg Gwalch; 0863815543
Griffin Mine - 223m
Pen yr Allt - 315m
Bwlch Cyrau - 438m
Aberllyn - 503m
Wheal George - 1,120m
Ffrith Rhedyn - 1,330m
Diosgydd - 1,412m
Ffridd Rhedyn - 1,452m
Coed Mawr Pool - 1,456m
Rhyd y Creau - 1,473m
Cilcenus - 1,653m
Ffriddllechwedd - 1,767m
Gwaynllifon Deep Adit - 1,810m
Gwaynllifon - 1,844m
Suttons Shaft - 1,905m
Alltwen Mine - 1,956m
Hafodlas - 1,976m