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Castell Carn Dochan, Llanuwchilyn, Dolgellau Gold Belt, Gwynedd, Wales, UK

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Latitude & Longitude (WGS84): 52° 51' 40'' North , 3° 42' 30'' West
Latitude & Longitude (decimal): 52.86116,-3.70835
UK National Grid Reference:SH850307
Köppen climate type:Cfb : Temperate oceanic climate
Other/historical region names associated with this locality:Merionethshire
Other regions containing this locality:Snowdonia National Park, Wales, UK

A small mine, and by far the most easterly mine within the Merioneth gold-mining area, being isolated over 6 miles to the east of the northerly group of mines that includes the well-known Gwynfnydd Mine.

Castell Carn Dochan was a relatively late discovery in the area, a company being formed in Manchester in 1863 to work the mine after gold was discovered here by a 12 year old boy, although many quartz boulders showing visible gold were scattered on the hillside.

Operations between 1864-66 produced 1508 ounces of gold from 3158 tons of quartz, with fine specimens being found underground. However, yields declined by 1866, and the plant was sold in 1876 following a winding-up order.

Later revived, the mine worked on a small scale till 1905. Records show 12.5 ounces of gold from 50 tons of quartz in 1889, and 393 ounces of gold from 2638 tons of quartz between 1895-98. The deep adit, north-east of the mine from near the river, was completed about 1901.

Castell Carn Dochan was the 4th most productive of the Merioneth gold mines. Some lead was also produced.

ref. - The Gold Mines of Merioneth, G.W. Hall (undated)

Mineral List

15 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

449 - 458.4 Ma

ID: 2025455
Caradoc Rocks (Undifferentiated)

Age: Late Ordovician (449 - 458.4 Ma)

Lithology: Mudstone, siltstone and sandstone

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

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

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.
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