Early underground working.*
Publications (3)
- Richards, Alun J. (2013); Slate Quarrying in Wales; Gwasg Carreg Gwalch; ISBN 1-84527-026-6
- 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; 0863815872
Bryngelynnen - 223m
Parc Slab - 329m
Garreg Uchaf - 354m
Rhaiadr Mine - 671m
Croesor Bach - 727m
Hafodty - 1,017m
Cefn y Braich - 1,137m
Criblwyd - 1,216m
Cwm Croesor - 1,221m
Fronboeth - 1,222m
Parc - 1,270m
Hafod Uchaf - 1,393m
Hafod Uchaf - 1,428m
Gelli - 1,703m
Cnicht - 1,877m
Traian - 1,909m
Ty'n y Ddol - 1,927m