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Old Gunnislake Mine, Clitters United Mines, Gunnislake, Calstock, Callington District, Cornwall, England, UK
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UK Grid Reference: SX430719
Latitude: 50°31'30"N
Longitude: 4°12'54"W
 
 
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

Autunite
Azurite
Cassiterite
Chalcanthite
Chalcocite
Chalcophyllite
Chenevixite
Chrysocolla
Connellite
Copper
Cuprite
var: Chalcotrichite
Cuprotungstite
Erythrite
Fluorapatite
var: Carbonate-rich Fluorapatite
Libethenite
Liroconite
Malachite
Metatorbernite
Mixite
Olivenite
Pharmacosiderite
Pseudomalachite
Reichenbachite
Scheelite
Scorodite
Tenorite
Torbernite
Tyrolite
Uraninite
'Wolframite'
Zippeite


34 entries listed. 30 valid minerals.

The above list 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)
- Braithwaite, R. S. W. and Ryback, G. (1994): Reichenbachite from Cornwall and Portugal. Mineral. Mag., 58, 449-454.
- Chris Popham (visit Jan 2005)

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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