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.
Ref.:
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.
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UK OS Grid Reference: SH210265
Map Reference: 52°48'21"N , 4°39'21"W
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