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The company that sank Cefn Slip Colliery near Tondu in the 1860s to supply coal to the Cefn Iron Works.
| Mine | Region | Years |
|---|---|---|
| Cefn Slip Colliery | Bridgend | ?–? |
Record created: 16 October 2026 · Last researched: 16 October 2026
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