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Formed in 1864-65 to consolidate and develop the Graig Ddu workings; succeeded by the Craigddu Slate Company from 1880.
| Mine | Region | Years |
|---|---|---|
| Graig Ddu Quarry | Gwynedd | 1864–1880 |
Record created: 26 August 2026 · Last researched: 26 August 2026
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