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United Mines (Gwennap United Mines), Clifford Amalgamated Mines, St Day, Gwennap CP, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 13' 52'' North , 5° 9' 25'' West
Latitude & Longitude (decimal): 50.23115,-5.15714
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK
Köppen climate type:Cfb : Temperate oceanic climate

United Mines (Gwennap United Mines) was the name taken by the company consisting of the former Ale and Cakes Mine, Wheal Cupboard and Poldory who amalgamated in about 1780. Later the group was expanded to include East Ale and Cakes Mine and Wheals Andrew (Friendship), Clifford and Squire, which all are located within a distance of about 1 km from United Downs. The United Mines worked mainly two lodes: the 'Great South Lode' and, a little further to the north, the 'Hot Lode', named for its extreme temperatures at greater depth.

In 1861, the United Mines were combined with the Great Consolidated Mines which ceased working in 1856, and which lay about 1 km further to the north, and included Wheals Girl, West Virgin, Virgin, East Virgin and Fortune.

The combined group was renamed Clifford Amalgamated Mines and continued, unprofitably, until 1870.

Note: Not to be mistaken for the St Day United Mines.

Mineral List

Mineral list contains entries from the region specified including sub-localities

28 valid minerals.


Geologic TimeRocks, Minerals and Events
ⓘ Major polymetallic mineralization~270 MaCornwall, England, UK
ⓘ Porphyry dikes intruded (latest age)~275 MaCornwall, England, UK
ⓘ Greisenization (latest age)~280 MaCornwall, England, UK
ⓘ Porphyry dikes intruded (earliest age)~280 MaCornwall, England, UK
ⓘ Formation of metallized pegmatites~285 MaCornwall, England, UK
ⓘ Greisenization (earliest age)~285 MaCornwall, England, UK
ⓘ Emplacement of major plutons~295 MaCornwall, England, UK

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

Late Devonian
358.9 - 382.7 Ma

ID: 2033495
Upper Devonian Rocks (Undifferentiated)

Age: Late Devonian (358.9 - 382.7 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

Localities in this Region


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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 420-426.
Lapis 11(2), 33 (1986)

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