Tiny workings.
Publications (1)
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
Ynystywyn
Slate Quarry
Jan 1st, 2024 from GWSI by Buddle-Bot
| North Wales | |
| Porthmadog | |
| 52.9252313, -4.1255379 | |
| SH 5721 3854 | |
| Private Land | |
| 5m | |
| #1,470 |
Morfa Lodge - 512m- Garth - 672m
- Tyddyn Llwyn - 1,033m
- Tu Hwnt y Bwlch - 1,135m
Gallt y Calch Ironworks - 1,183m- Moel y Gest - 1,331m
Pensyflog Rocks Mine - 1,391m- Penrhynllwyd - 1,511m
- Penybanc - 1,676m