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Partnership of the Shrewsbury ironmaster William Hazeldine and William Edwards, which bought and worked the slate quarry at Chwarel Isaf, Glyn Ceiriog, from 1818.
| Mine | Region | Years |
|---|---|---|
| Cambrian Quarry | Wrexham | 1818–? |
Record created: 4 October 2026 · Last researched: 4 October 2026
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