|Latitude & Longitude (WGS84):||50° 14' 5'' North , 5° 14' 47'' West|
|Latitude & Longitude (decimal):||50.23474,-5.24654|
|UK National Grid Reference:||SW685424|
|Other regions containing this locality:||Devon and Cornwall metalliferous mining district, England, UK|
In 1918, the Tolgus groups were acquired by East Pool and Agar Ltd. in order to develop the tin ground that was believed to lie below the copper orebodies of these mines. From 1923 to 1927, New Tolgus shaft was sunk within the Great South Tolgus sett to a depth of 2,000 feet to open up deep ground. At depths of 490 feet, 1,000 feet, 1,700 feet and 2,000 feet, crosscuts and prospection boreholes were driven. The shaft passed mainly through killas; at around 800 feet, a 200 feet thick greenstone layer was hit. Above this layer, elvans and barren quartz strings were encountered; below, more greenstone bands and occasional aplite veins were passed through. Lode fragments occurred at various depths below 1,000 feet, but they contained only traces of tin. Since the bores and crosscuts also failed to hit any economic mineralization, the project was abandoned; no work was carried out in the Tolgus sections after 1927.
The reference to danalite at New Tolgus Shaft is a Kingsbury (1961) citation. Given the doubts about the provenance of other Kingsbury specimens (Ryback et al. 1998, 2001), further confirmation is required.
9 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
|Geologic Time||Rocks, Minerals and Events|
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
358.9 - 382.7 Ma
|Upper Devonian Rocks (Undifferentiated)|
- Embrey, P.G., and Symes, R.F. (1987): Minerals of Cornwall and Devon, p. 43.