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Thompson & Hill acquired the Cae Coch pyrite (sulphur) mine in North Wales in 1821 to supply their sulphur manufacturing works in Liverpool, with output peaking at around 80 tons a month during the 1830s and 1840s.
| Mine | Region | Years |
|---|---|---|
| Cae Coch Sulphur Mine | Conwy | 1820–1880 |
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