Small underground working.*
Publications (1)
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
Clogwyn Garw - 457m
Chwarel Llew Twrog - 592m
Y Garnedd - 633m
Llyn Gamallt - 818m
Chwarel Llew Twrog - 855m
Gamallt - 930m
Bwlch y Slaters - 1,005m
Sarn Helen - 1,097m
South Pole - 1,142m
Ffridd - 1,290m
Frudd - 1,372m
Graig Ddu - 1,452m
Carters - 1,455m
Blaen y Cwm - 1,525m
Drum - 1,613m
Nantpistyll Gwyn - 1,685m
Nelw Williams Quarry - 1,762m
Rhiwbach - 1,824m
Foel-Gron - 1,936m