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William Elmore and his sons Francis and Alexander Stanley bought Glasdir in 1896 and installed the world's first industrial-scale oil-flotation plant there in 1897.
| Mine | Region | Years |
|---|---|---|
| Glasdir Mine | Gwynedd | 1896–1915 |
Record created: 24 August 2026 · Last researched: 24 August 2026
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