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The Lewis Merthyr company of Hafod, near Pontypridd, recorded as owner of Llwyncelyn Colliery from 1891 until it closed it in April 1895.
| Mine | Region | Years |
|---|---|---|
| Llwyncelyn Colliery | Rhondda Cynon Taf | 1891–1895 |
Record created: 9 October 2026 · Last researched: 9 October 2026
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