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St Day United Mines (Poldice Mines), St Day, Redruth, Gwennap CP, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 14' 16'' North , 5° 10' 28'' West
Latitude & Longitude (decimal): 50.23785,-5.17470
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK
Köppen climate type:Cfb : Temperate oceanic climate


The name St Day United Mines was given to Poldice Mine and Carharrack Mine following an amalgamation in 1852.

In 1864, Wheal Unity, Wheal Gorland and Creegbrawse and Penkevil were added to this amalgamation. Subsequently in 1870 the group name was changed to Poldice Mines. Wheal Maid is also stated to have formed part of the group, probably as a result of working in conjunction with Carharrack Mine, which adjoins Wheal Maid's south-western boundary.

The initial name of the amalgamation is based upon the principal village in the area and has no relevance to the parish boundaries, hence most of the mines are located in Gwennap parish, except for Wheal Gorland (in St Day parish) and Creegbrawse and Penkevil Mine (in Chacewater parish).

Since the amalgamation between 1852-93 the outputs given under St Day United or Poldice Mines are: 22,900 tons of 6% copper ore, 3280 tons of black tin, 124 tons of mispickel (arsenic ore) and 49 tons of fluorspar.

Not to be mistaken for the Gwennap United Mines.

From a mineral location perspective, unless no other information is available, specimens should be assigned to the individual mines rather than the group designation.

Edited by Dale Foster


Mineral List


5 valid minerals.

Geochronology

Geologic TimeRocks, Minerals and Events
Phanerozoic
 Paleozoic
  Permian
   Guadalupian
ⓘ Major polymetallic mineralization~270 MaCornwall, England, UK
   Cisuralian
ⓘ 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 Macrostrat.org

Middle Devonian
382.7 - 393.3 Ma



ID: 2035678
Middle Devonian (Undifferentiated)

Age: Middle Devonian (382.7 - 393.3 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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Russell, A. (1911) On the occurrence of phenacite in Cornwall. Mineralogical Magazine, vol. 16, n° 73, 55-62.
Russell, A. (1920) On the occurrence of phenacite and scheelite at Wheal Cock, St. Just, Cornwall. Mineralogical Magazine, vol. 19, n° 88, 19-22. (referring to Russell, 1911).
Dines, H.G. (1956) The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, p. 417.

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