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Old Gunnislake Mine (Gunnislake Mine), Clitters United Mines, Gunnislake, Calstock, Callington District, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 31' 30'' North , 4° 12' 54'' West
Latitude & Longitude (decimal): 50.52500,-4.21500
UK National Grid Reference:SX430719
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK
Köppen climate type:Cfb : Temperate oceanic climate


This site was right in the middle of Gunnislake village and famed for the diversity of its minerals. The site was cleared and built on in the late 1970's early 1980's.
An adit level is driven from the river bank, initially in the killas heading slightly north of due west following the copper lode evidence of which is clear in the site photos. Copper mineralisation apparently stops well short of the granite killas boundary (photo) and the drive further into the granite is also barren. About 20 yards from the boundary the adit turns sharply to almost due north.
The granite-killas boundary marks the re-appearance of the main lode which has been exploited to the west. This initially follows the contact but then drives into the granite. Along the drive of the original adit a second mineral vein appears about 10 yards into the granite but this has only been exploited for about 20 yards to the west.
On the main drive to the west the mineralisation quickly ends and there is then another patch of barren ground before the lode reappears, heaved slightly to the north. Here the lode is very rich in copper (photo) as well as dark purple fluorite with lenses of arsenopyrite. Wolframite appears here as blades up to 2 inches long as pegmatites in quartz. The only stoping on this adit level is at the far end of the drive where the lode is most extensive. There is then a short brick tunnel, blocked at the far end, which gave access to one of the 2 shafts which reached this level. At this point there is also a flooded winze to a lower level.
The adit is quite radioactive, counts rising to about 100/ second within 50 yards of the portal and remaining so throughout the works except in the barren ground on the main drive to the west where counts in excess of 200/ second prevail. However, no localisations of radioactive sources were detected throughout the workings.


Mineral List


30 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



ID: 2034644
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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
- Dines H.G. (1956)
- Braithwaite, R. S. W. and Ryback, G. (1994): Reichenbachite from Cornwall and Portugal. Mineralogical Magazine, 58, 449-454.
- Chris Popham (visit Jan 2005)

Mineral and/or Locality  
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