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The firm of James Furness Tone, which took over Plashetts Colliery in the North Tyne valley from the Duke of Northumberland in the 1860s and sank its Seldom Seen Pit.
| Mine | Region | Years |
|---|---|---|
| Plashetts Colliery | Northumberland | ?–? |
Record created: 5 October 2026 · Last researched: 5 October 2026
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