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Opened Penybont Colliery at Abertillery in the late 1840s and reached its steam coal in November 1850.
| Mine | Region | Years |
|---|---|---|
| Penybont Colliery | Blaenau Gwent | ?–1851 |
Record created: 11 October 2026 · Last researched: 11 October 2026
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