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Penrhyn Slate Quarry, Bethesda, Gwynedd, Wales, UK

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Latitude & Longitude (WGS84): 53° 9' 43'' North , 4° 3' 51'' West
Latitude & Longitude (decimal): 53.1621236692, -4.06437811779
UK National Grid Reference:SH620648
Other/historical region names associated with this locality:Caernarvonshire
Other regions containing this locality:Snowdonia National Park, Wales, UK

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

9 valid minerals.

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Bevins, R.E. (1994) A Mineralogy of Wales. National Museum of Wales, Geological Series No. 16. Cardiff.

Green, D.I., Hubbard, N., and Ince, F. (2008) A review of the occurrences of the copper vanadate minerals volborthite and tangeite in the British Isles. Journal of the Russell Society, vol. 11, 54-58.

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