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The company that opened Gwendraeth Colliery outside Pontyates in the late 1800s and owned it in 1910.
| Mine | Region | Years |
|---|---|---|
| Gwendraeth Colliery, Pontyates | Carmarthenshire | ?–? |
Record created: 10 October 2026 · Last researched: 10 October 2026
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