First developed in 1770 by Richard Pennant, who became the first Baron Penrhyn, Penrhyn Quarry, a huge pit a mile long and 1200 ft deep is reputedly the world's largest slate quarry.
Profits from the quarry financed the construction of Penrhyn Castle at nearby Bangor. A feature of the castle is the great four-poster bed of Penrhyn slate, which weighs four tons.
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UK OS Grid Reference: SH620648 Map Reference: 53°9'43"N , 4°3'51"W
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