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Formed in 1889 by the two sons of William Bullock to work Minllyn quarry, the last company to do so; the quarry closed for the final time in 1925.
| Mine | Region | Years |
|---|---|---|
| Minllyn Slate Quarry | Gwynedd | 1889–1925 |
Record created: 8 September 2026 · Last researched: 8 September 2026
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