Small underground working with collapsed adit.
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; 0863815716
Dol Pistyll - 705m- Nant Heilyn - 921m
- Gyrn - 984m
- Ffridd - 1,027m
- Bryn Hafod y Wern - 1,167m
- Crymlyn - 1,227m
- Aber - 1,398m
- Pant y Darren - 1,472m
- Bronnydd - 1,553m
- Gallt y Mawn - 1,801m
- Yr Ogof - 1,896m
- Tan y Bwlch - 1,976m
- Bronydd Isaf - 1,989m
