MineArchiveDyffryn Mining Company
Opened Hafotty in December 1885 and worked it as the largest of Merioneth's manganese mines until 1894, when underground working ceased.
Mines operated
| Mine | Region | Years |
|---|---|---|
| Hafotty Manganese Mine | Gwynedd | 1885–1894 |
Record created: 22 August 2026