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North Wheal Crofty, Pool, Carn Brea, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 13' 33'' North , 5° 16' 34'' West
Latitude & Longitude (decimal): 50.22596,-5.27619
UK National Grid Reference:SW661414
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK


This mine was started as a copper mine in the early 19th century. First known as Trevenson Mine, it changed its name to East Wheal Crofty, when two small adjoining properties, Longclose and Dudnance mines, were included with the sett in 1830. In 1854, the latter mines were taken over by South Crofty Mine and East Wheal Crofty changed its name again to North Wheal Crofty. It continued work under this name until 1915, when it was included with South Crofty Mine. Pool Mine was the easternmost section; it was located just west of Pool cross-roads.

The sett extends from the Red River valley in the west to Pool in the east. The Camborne-Redruth road marks the southern boundary, and in the north, it is adjoined by East Wheal Seton. It comprises four lodes, from north to south, Fane's lode, Reeve's lode, Trevenson lode (Engine lode) and Cherry Garden lode. Except for Reeve's lode, which trends E-W, they all course in north-easterly directions. Trevenson lode, about 100 yards south of Reeve's lode in the west, joins the footwall of Reeve's lode in the middle of the sett. Cherry Garden lode, just south of Trevenson lode, does not intersect Reeve's lode, but changes strike and trends ENE in the eastern part of the sett. Only Reeve's lode was worked throughout the full length of the sett, a distance of about 1,000 yards. It was particularly productive in the western part, where it was up to 4 feet wide, and carried mainly copper ores. At depth, it became generally poor, although some patches of rich tin ores are said to have been encountered below the 110 fm level. It extends westwards into the Wheal Crofty sett, where it was known as Caunter lode.

Under the name East Wheal Crofty, the mine produced 100,952 tons of 7% copper ore during the periods 1832-1836, 1838, and 1848-1853, and 41 tons of black tin in 1855 and 1861. As North Wheal Crofty, it raised 9,319 tons of 6% copper ore between 1854 and 1874, and 1,635 tons of black tin in the years 1855-1874, 1899 and 1910.

Mineral List


12 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

Late Devonian
358.9 - 382.7 Ma
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 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

- Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 288-290.

 
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