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The Gwydir estate in the Conwy valley, which owned the land of Chwarel Ddu slate quarry near Dolwyddelan and built a cart road from it to the Holyhead road in 1810.
| Mine | Region | Years |
|---|---|---|
| Chwarel Ddu Quarry | Conwy | ?–? |
Record created: 4 October 2026 · Last researched: 4 October 2026
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