Surface soils around the Nanhua mine

Eastern Yunnan, Nanhua mine, China

Soils

Type: Soil

Surroundings of the Nanhua arsenic-thallium mine (eastern Yunnan), where As2O3 was produced for over 40 years until 2000. Three mixing end-members: lorandite ore (-0.10), host rock (+1.85) and roasting tailings (+5.35); mine wastes supply on average 78 % of Tl in surface soils, over 90 % in the profile and almost all in rhizosphere soils; values too heavy for mixing (surface soil 6, profile 2 at 20-40 cm) are ascribed to Tl oxidation and fixation on Fe-Mn oxides (abundant hematite). (Wei et al., 2026). Coordinates not published (map only); individual values from Table S2; profile levels numbered without published depths, except level 2 (20-40 cm).

ε205Tl in ε units (parts per 10,000) Values of the same system

Standard : NIST SRM 997

Value	n	Mineral or matrix	Source
0.93 ± 0.31 ε	1	surface soil 1 Published value; ± 0.31 (2 SD).	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
0.42 ± 0.08 ε	1	surface soil 2 Published value; ± 0.08 (2 SD); lowest surface soil value.	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
3.22 ± 0.4 ε	1	surface soil 3 Published value; ± 0.4 (2 SD).	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
4.16 ± 0.34 ε	1	surface soil 4 Published value; ± 0.34 (2 SD).	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
2.21 ± 0.09 ε	1	surface soil 5 Published value; ± 0.09 (2 SD).	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
5.61 ± 0.4 ε	1	surface soil 6 Published value; ± 0.4 (2 SD); highest value, beyond the tailings end-member: Tl oxidation and fixation on Fe-Mn oxides, possibly plant uptake of light Tl.	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
1.5 ± 0.24 ε	1	surface soil 7 Published value; ± 0.24 (2 SD).	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
3.04 ± 0.08 ε	1	surface soil 8 Published value; ± 0.08 (2 SD).	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
3.84 ± 0.44 ε	1	surface soil 9 Published value; ± 0.44 (2 SD).	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
0.71 ± 0.18 ε	1	surface soil 10 Published value; ± 0.18 (2 SD).	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…
2.55 ± 0.57 ε	1	surface soil 11 Published value; ± 0.57 (2 SD); sample farthest from the mine, the only one with under 50 % mining-derived Tl.	Wei et al. (2026), Tracing thallium pollution in arsenic mining/smelting areas using high…

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Cite this page

IsoFind Atlas (2026). Surface soils around the Nanhua mine, isotope signatures. https://www.isofind.tech/isotopes/en/sites/sols-de-surface-autour-de-la-mine-de-nanhua/ (accessed 2026-10-16).

@misc{isofind2026surfacesoilsaroundthenanhuami,
  title = {Surface soils around the Nanhua mine, isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/sites/sols-de-surface-autour-de-la-mine-de-nanhua/},
  note = {Accessed 2026-10-16}
}

Updated : 2026-10-16