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Company that opened Clydach Merthyr Colliery at Craig Cefn Parc in 1863; it later became the Graigola Merthyr Company.
| Mine | Region | Years |
|---|---|---|
| Clydach Merthyr Colliery | Swansea | 1863–? |
Record created: 10 October 2026 · Last researched: 10 October 2026
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