St Agnes (tin district)
North Cornwall coast, United Kingdom
Other hydrothermalSn
- Type
- Granite-related cassiterite veins and greisens
Tin lodes of the St Agnes district (Wheal Kitty, Trevaunance, Blue Hills) above a shallow granite cupola. 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 |
|---|---|---|---|---|
| 0.68 ± 1.37 ‰ | −1.18 / 2.1 ‰ | 4 | primary cassiterite, St Agnes mine Mean and standard deviation recalculated from 4 samples, Appendix A1. Mean δ124/120Sn of 0.19 ‰ (Puratronic). Replicates of a sample averaged. Highly scattered: from -1.18 ‰ (MA-080507) to 2.10 ‰ (MA-080508). | Marahrens (2021), Tin isotope analysis of tin ore deposits in Europe and Central Asia in … |
| 0.92 ± 0.57 ‰ | 0.34 / 1.77 ‰ | 6 | primary cassiterite, other mines of the district Mean and standard deviation recalculated from 6 samples, Appendix A1. Mean δ124/120Sn of 0.31 ‰ (Puratronic). Replicates of a sample averaged. Breakdown (δ124Sn): Wheal Kitty Mine 0.34, 1.08; unknown locality 1.77, 1.30; Wheal Vottle Mine 0.34; Trevaunance Mine 0.69. | Marahrens (2021), Tin isotope analysis of tin ore deposits in Europe and Central Asia in … |
| 0.57 ± 0.04 ‰ | 0.54 / 0.6 ‰ | 2 | secondary cassiterite (placers) Mean and standard deviation recalculated from 2 samples, Appendix A7. Mean δ124/120Sn of 0.14 ‰ (Puratronic). Replicates of a sample averaged. Breakdown (δ124Sn): Wheal Kitty Mine 0.54; Blue Hills Mine 0.60. | Marahrens (2021), Tin isotope analysis of tin ore deposits in Europe and Central Asia in … |
| 1.29 ± 0.48 ‰ | 0.95 / 1.62 ‰ | 2 | placer and vein cassiterite Mean and standard deviation recalculated from 2 samples, "Tin isotopes - tin ores" sheet of OSM2; replicates averaged. Detail (δ124Sn): Wheal Droskyn, surface vein (1.62), Chapel Porth stream (0.95). | 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 |
|---|---|---|---|---|
| 18.4355 / 29.5713 | 5 | cassiterite concentrate (bulk lead) Range of 5 ores, "Lead isotopes - tin ores" sheet of OSM2 (marine placer, surface vein). Cassiterite lead is partly radiogenic and spreads along an isochron: no representative central value. Sites: Blue Hills, Chapel Porth stream, Trevaunance Cove, Wheal Bungay, Wheal Droskyn. | 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 |
|---|---|---|---|---|
| 15.6375 / 16.2322 | 5 | cassiterite concentrate (bulk lead) Range of 5 ores, "Lead isotopes - tin ores" sheet of OSM2 (marine placer, surface vein). Cassiterite lead is partly radiogenic and spreads along an isochron: no representative central value. Sites: Blue Hills, Chapel Porth stream, Trevaunance Cove, Wheal Bungay, Wheal Droskyn. | 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 |
|---|---|---|---|---|
| 38.033 / 38.505 | 5 | cassiterite concentrate (bulk lead) Range of 5 ores, "Lead isotopes - tin ores" sheet of OSM2 (marine placer, surface vein). Cassiterite lead is partly radiogenic and spreads along an isochron: no representative central value. Sites: Blue Hills, Chapel Porth stream, Trevaunance Cove, Wheal Bungay, Wheal Droskyn. | Williams et al. (2025), From Land's End to the Levant: did Britain's tin sources transfor… |
Deposits of the same type
- Cligga Head United Kingdom
- Cornwall tin district United Kingdom
- Carnmenellis granite (Camborne-Redruth) United Kingdom
- St Austell granite United Kingdom
- Land's End granite (tin district) 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). St Agnes (tin district), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/st-agnes-district-stannifere/ (accessed 2026-10-13).
@misc{isofind2026stagnestindistrictisotopesign,
title = {St Agnes (tin district), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/st-agnes-district-stannifere/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13