MineArchiveJ.W. Greaves
John Whitehead Greaves opened the Llechwedd slate quarry in 1846 and nearly lost everything before his workers, carrying on unpaid, struck the rich 'Old Merioneth Vein' that secured the quarry's future.
Mines operated
| Mine | Region | Years |
|---|---|---|
| Llechwedd Slate Caverns | Gwynedd | 1846–? |
Record created: 21 August 2026 · Last researched: 21 August 2026