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The limited company that held Glanrafon slate quarry, Rhyd Ddu, by 1904 and was wound up in 1916, when the quarry closed.
| Mine | Region | Years |
|---|---|---|
| Glanrafon Quarry | Gwynedd | ?–1916 |
Record created: 21 October 2026 · Last researched: 21 October 2026
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