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Methusalem Jones

A quarryman from the established Cilgwyn quarry in Nantlle who led the workers that first opened Diphwys Casson around 1760, discovering and exploiting the Old Vein that underpinned the prosperity of the wider Ffestiniog slate district.

Mines operated

MineRegionYears
Diphwys Casson Quarry Gwynedd 1760–1800

Record created: 29 August 2026 · Last researched: 29 August 2026

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