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Penrhyn Slate Quarry, Bethesda, Gwynedd (Caernarvonshire), Wales, UK
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UK Grid Reference: SH620648
Latitude: 53°9'43"N
Longitude: 4°3'51"W
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.

Mineral List


8 entries listed. 8 valid minerals.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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