Underground trial, with adit to flooded chamber.
Publications (1)
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
Sarn Helen
Slate Mine
Jan 1st, 2024 from GWSI by Buddle-Bot
| North Wales | |
| Llan Ffestiniog | |
| 52.974685, -3.8912959 | |
| SH 7310 4360 | |
| Private Land | |
| 350m | |
| #1,553 |
Carters - 360m
Gamallt - 480m- Drum - 719m
- Chwarel Llew Twrog - 765m
- Chwarel Llew Twrog - 924m
- Cwm Teigl - 1,097m
- Clogwyn Garw - 1,203m
- Y Garnedd - 1,403m
- Bryn-Glas - 1,481m
- Foel-Gron - 1,497m
Llyn Gamallt - 1,500m- South Pole - 1,649m
- Bwlch y Slaters - 1,901m
- Graig Ddu - 1,929m