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David James of Merthyr, who sank the Porth Colliery in 1845 and Llwyncelyn Colliery, Porth, in 1851.
| Mine | Region | Years |
|---|---|---|
| Llwyncelyn Colliery | Rhondda Cynon Taf | 1851–? |
Record created: 9 October 2026 · Last researched: 9 October 2026
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