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.
References:
- Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 1, pp. 294-296.
- Embrey, P.G., and Symes, R.F. (1987): Minerals of Cornwall and Devon, p. 43.
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UK OS Grid Reference: SW685424
Map Reference: 50°14'8"N , 5°14'48"W
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Mineral List:12 entries listed. 8 valid minerals.
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