Small underground working.**
Publications (1)
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
Gelli
Slate Mine
Jan 1st, 2024 from GWSI by Buddle-Bot
| North Wales | |
| Croesor | |
| 52.995664, -4.0323043 | |
| SH 6370 4619 | |
| Open Access | |
| 330m | |
| #1,501 |
Criblwyd - 492m
Cwm Croesor - 513m- Cnicht - 599m
- Croesor Bach - 992m
- Bryngelynnen - 1,521m
- Cefn y Braich - 1,656m
- Llidiart yr Arian - 1,703m
- Fronboeth - 1,706m
- Parc Slab - 1,781m