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The cost-book company that reopened the Walkham valley sett below Grenofen as Gem Mine in 1871, under managing director J. Legassick, and was wound up in 1874.
| Mine | Region | Years |
|---|---|---|
| Gem Mine | Devon | 1871–1874 |
Record created: 21 October 2026 · Last researched: 21 October 2026
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