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Company formed in 1857 to work the Cambrian slate quarries west of Glyn Ceiriog, which it ran until their closure in 1947.
| Mine | Region | Years |
|---|---|---|
| Cambrian Quarry | Wrexham | 1857–1947 |
Record created: 4 October 2026 · Last researched: 4 October 2026
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