The Pantdreiniog quarry was a slate quarry within the town of Bethesda in North Wales. It was worked between about 1825 and 1923. It played a significant part in the Penrhyn Great Strike, Britain's longest industrial dispute.
The early history of the quarry is obscure, but it appears to have started around 1825, and was certainly working in 1845, when quarryman John Hughes of Maentwrog fell to his death into the pit, which was then 40 yards deep. In 1860, owned by William Owen, the Pantdreiniog Slate Company produced 3,000 tons of slate, dropping to 1,372 tons produced by 30 men in 1864. During the 1860s, the quarry expanded and took over the adjacent Coetmor Quarry. Sometime in the late 1860s the quarry closed.
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