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The construction group that owned Honister at the point it closed in the 1980s, after a long decline in demand for Lakeland green slate.
| Mine | Region | Years |
|---|---|---|
| Honister Slate Mine | Cumbria | 1980–1989 |
| Manod Quarry | Gwynedd | 1980–2007 |
Record created: 24 August 2026 · Last researched: 24 August 2026
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