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Excelsior Mine (incl. Excelsior Tunnel), Stoke Climsland, Callington District, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 31' 42'' North , 4° 17' 4'' West
Latitude & Longitude (decimal): 50.52833,-4.28444
UK National Grid Reference:SX381724
Köppen climate type:Cfb : Temperate oceanic climate
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK


Ref; Richardson.P.H.G (1991)., Mines of Dartmoor & the Tamar Valley after 1913., Deven Books, Tiverton.
Hanilton Jenkin XV 1969.
Dines 1956.

Under the name Excelsior the mine was at work at times between 1873 and 1884 on far older workings, producing 5 tons of tin ore. The Excelsior Tunnel was driven southwestward from Deerpark Wood towards the North Engine Shaft of Kit Hill looking for lodes of tin and copper. Driving of the tunnel started in 1877 and continued on and off over the next 60 years until 1938 when it was finally given up, still about 310mts short of its objective. It is however almost 1km in length and dead straight, it is possible to see the portal from the far end.
In 1959 it was receiving the attention of the Military / Atomic Energy Authority as a site to test the possibility of masking the seismic signal given out by underground nuclear tests. A history is given here with excellent photos http://www.subbrit.org.uk/sb-sites/sites/e/excelsior_tunnel/index3.shtml
However, to update the above page there are now several collapsed areas and the remaining timbering is looking very unstable. There are no mineral exposures within the tunnel and the minerals listed were most likely recovered from the now very overgrown dumps. (June 2005).

Mineral List


3 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



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