Carnmenellis granite (Camborne-Redruth)
Camborne-Redruth, central Cornwall, United Kingdom
Other hydrothermalSn-Cu
- Type
- Granite-related cassiterite veins and greisens
Camborne-Redruth district around the Carnmenellis granite, the most productive in Cornwall (South Crofty, Wheal Pendarves, St Day); Carnon valley placers. Cassiterite studied by Marahrens (2021) for Bronze Age tin provenance. Indicative coordinates.
δ124Sn in ‰ (per mil) Values of the same system
Standard : NIST SRM 3161a
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.01 ± 0.96 ‰ | −1.43 / 0.61 ‰ | 4 | primary cassiterite Mean and standard deviation recalculated from 4 samples, Appendix A1. Mean δ124/120Sn of -0.13 ‰ (Puratronic). Replicates of a sample averaged. Breakdown (δ124Sn): St. Day 0.44; South Crofty Mine, Pool -1.43; Wheal Maid Mine 0.61; Wheal Pendarves Mine 0.41. South Crofty very light (-1.43 ‰). Table 6.1 splits sample MA-081297 (Wheal Pendarves, six analyses) among several mines. | Marahrens (2021), Tin isotope analysis of tin ore deposits in Europe and Central Asia in … |
| −0.05 ± 0.67 ‰ | −0.75 / 0.59 ‰ | 3 | secondary cassiterite (placers), Carnon valley Mean and standard deviation recalculated from 3 samples, Appendix A7. Mean δ124/120Sn of -0.15 ‰ (Puratronic). Replicates of a sample averaged. Breakdown (δ124Sn): Carnon-placer near Truro 0.01; Carnon River 0.59; Carnon Wakes Flock -0.75. | Marahrens (2021), Tin isotope analysis of tin ore deposits in Europe and Central Asia in … |
| 0.75 ± 0.06 ‰ | 0.7 / 0.81 ‰ | 3 | placer cassiterite, including ores from Bronze Age sites Mean and standard deviation recalculated from 3 samples, "Tin isotopes - tin ores" sheet of OSM2; replicates averaged. Detail (δ124Sn): Carnon (0.70), Tregurra pit 3417 (0.73, mean of three samples), Tolgarrick pit 2687 (0.81, mean of two). | Williams et al. (2025), From Land's End to the Levant: did Britain's tin sources transfor… |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 17.7875 / 53.748 | 15 | cassiterite concentrate (bulk lead) Range of 15 ores, "Lead isotopes - tin ores" sheet of OSM2 (buried placer, marine placer, surface placer, underground vein). Authors' "Carnmenellis and Godolphin" group. Cassiterite lead is partly radiogenic and spreads along an isochron: no representative central value. Sites: Carnon Valley tin + gold, Creegbrawse, Great Wheal Fortune, Higher Besore, Porthtowan, Portreath Beach two outfalls, River Allen Idless, South Crofty Mine (vein sample), St Erth Valley, Tolgarrick Farm (pit 2687-46-2511), Tregurra (pit 2447, Tregurra (pit 3417, Wheal Grey, Wheal Henry. | Williams et al. (2025), From Land's End to the Levant: did Britain's tin sources transfor… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.587 / 17.9155 | 15 | cassiterite concentrate (bulk lead) Range of 15 ores, "Lead isotopes - tin ores" sheet of OSM2 (buried placer, marine placer, surface placer, underground vein). Authors' "Carnmenellis and Godolphin" group. Cassiterite lead is partly radiogenic and spreads along an isochron: no representative central value. Sites: Carnon Valley tin + gold, Creegbrawse, Great Wheal Fortune, Higher Besore, Porthtowan, Portreath Beach two outfalls, River Allen Idless, South Crofty Mine (vein sample), St Erth Valley, Tolgarrick Farm (pit 2687-46-2511), Tregurra (pit 2447, Tregurra (pit 3417, Wheal Grey, Wheal Henry. | Williams et al. (2025), From Land's End to the Levant: did Britain's tin sources transfor… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 37.742 / 40.761 | 15 | cassiterite concentrate (bulk lead) Range of 15 ores, "Lead isotopes - tin ores" sheet of OSM2 (buried placer, marine placer, surface placer, underground vein). Authors' "Carnmenellis and Godolphin" group. Cassiterite lead is partly radiogenic and spreads along an isochron: no representative central value. Sites: Carnon Valley tin + gold, Creegbrawse, Great Wheal Fortune, Higher Besore, Porthtowan, Portreath Beach two outfalls, River Allen Idless, South Crofty Mine (vein sample), St Erth Valley, Tolgarrick Farm (pit 2687-46-2511), Tregurra (pit 2447, Tregurra (pit 3417, Wheal Grey, Wheal Henry. | Williams et al. (2025), From Land's End to the Levant: did Britain's tin sources transfor… |
Deposits of the same type
- Cornwall tin district United Kingdom
- St Agnes (tin district) United Kingdom
- Cligga Head United Kingdom
- Land's End granite (tin district) United Kingdom
- St Austell granite United Kingdom
- Bodmin Moor granite United Kingdom
- Kit Hill granite (Callington) United Kingdom
- Hingston Down (quarry, Calstock) United Kingdom
Cite this page
IsoFind Atlas (2026). Carnmenellis granite (Camborne-Redruth), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/granite-de-carnmenellis-camborne-redruth/ (accessed 2026-10-13).
@misc{isofind2026carnmenellisgranitecambornere,
title = {Carnmenellis granite (Camborne-Redruth), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/granite-de-carnmenellis-camborne-redruth/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13