MineArchiveLlwyn Du Colliery Company Limited
The company that worked the Graigola Level and the Upper Graigola Level at Glais in the Swansea Valley together from 1923, employing 90 men between them that year and 120 at Upper Graigola in 1925 and 1927.
Mines operated
| Mine | Region | Years |
|---|---|---|
| Upper Graigola Colliery | Neath Port Talbot | 1923–? |
Record created: 29 September 2026 · Last researched: 29 September 2026