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Nant Mine, Nant-y-Gadwen, Llanfaelrhys, Lleyn Peninsula, Gwynedd, Wales, UK

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Latitude & Longitude (WGS84): 52° 48' 21'' North , 4° 39' 21'' West
Latitude & Longitude (decimal): 52.80583,-4.65583
UK National Grid Reference:SH210265
Other/historical region names associated with this locality:Caernarvonshire


The southernmost of a small group of manganese mines near the village of Rhiw. The group, which included the Bennalt and Rhiw mines was the largest producer of manganese ore in the UK in the early 20th century. Nant Mine raised 45,644 tons of manganese ore prior to its closure in 1927.

Caryopilite (first UK occurrence) and pyroxmanganite (first Welsh occurrence) both occur as thin orange-brown veins in siliceous, massive manganese ore.

Mineral List


11 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Whiterock
456.5 - 470 Ma
Llanvirn Rocks (Undifferentiated)

Age: Ordovician (456.5 - 470 Ma)

Lithology: Mudstone, siltstone and sandstone

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Cotterell, T.F. (2006): Caryopilite and pyroxmangite from Nant Mine, Nant-y-Gadwen, Llanfaelrhys, Pen Llyn, Gwynedd, Wales. UK Journal of Mines and Minerals, 27, 51-53.

Mineral and/or Locality  
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