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Recorded as operators of Glanrafon slate quarry, Rhyd Ddu, from 1892 until the Glanrafon Slate Quarry company took it on; no further detail of the partners has been found.
| Mine | Region | Years |
|---|---|---|
| Glanrafon Quarry | Gwynedd | 1892–? |
Record created: 21 October 2026 · Last researched: 21 October 2026
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