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Owners of the Rhiw Colbren levels near Abertillery from about 1918, employing 26 men underground and 9 at the surface in 1923.
| Mine | Region | Years |
|---|---|---|
| Rhiw Colbren Colliery | Blaenau Gwent | ?–? |
Record created: 11 October 2026 · Last researched: 11 October 2026
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