Working with collapsed tunnels.*
Publications (1)
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
Caerbanciau - 326m
Bwlch y Groes - 458m
Twll Goch - 468m
Glynrhonwy Lower - 494m
Glynrhonwy Upper - 531m
Goodmans - 669m
Cook & Ddol - 684m
Glynrhonwy - Bomb Store - 806m
Cefn Ddu - 1,101m
Donnen Las - 1,348m
Brynmawr - 1,354m
Ladas - 1,422m
Chwarel Fawr - 1,427m
Boundary - 1,434m
Alltwen - 1,676m
Vaynol - 1,719m
Chwarel Isaf - 1,748m
Fronhyfryd - 1,917m
Pen Llyn - 1,926m
National Slate Museum - 1,944m