Rosh Pinah
Karas, edge of the Namib Desert (20 km north of the Orange River), Namibia
SEDEXZn-Pb (Cu, Ba)
- Type
- Neoproterozoic stratiform sedimentary-exhalative Zn-Pb
740 Ma disseminated to massive sulphides (sphalerite, pyrite, galena, minor chalcopyrite) in silicified black shales, As-bearing feldspars and altered carbonates of the Rosh Pinah Formation (Hilda Subgroup, Port Nolloth Group), with Ba enrichment (barite) (Alchin et al., 2005). Underground mine operating since 1969, about 700,000 t/yr at 7.9 % Zn, 1.7 % Pb and 0.1 % Cu; flotation tailings stored in a 60 ha dam 1.5 km south of the plant. Milled flotation tailings with a mean ε205Tl of +6.2, taken as an approximate reference for mineralisation Tl (Grösslová et al., 2018). Indicative coordinates (Rosh Pinah settlement, after Wikipedia).
ε205Tl in ε units (parts per 10,000) Values of the same system
Standard : NIST SRM 997
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 6.21 ± 0.16 ε | 6.1 / 6.32 ε | 2 | flotation tailings (milled ore without thermal or chemical treatment) Mean and standard deviation recalculated from 2 analyses, FW1 (13.0 mg/kg Tl) and FW2 (26.5 mg/kg); ± 0.7 ε (2 SD) on each value; Tl mostly held by pyrite, sphalerite and muscovite-illite (over 80 % in the oxidisable fraction); approximate reference for mineralisation Tl, ore and silico-carbonate gangue mixed. | Grösslová et al. (2018), Thallium contamination of desert soil in Namibia: Chemical, mine… |
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Cite this page
IsoFind Atlas (2026). Rosh Pinah, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/rosh-pinah/ (accessed 2026-10-15).
@misc{isofind2026roshpinahisotopesignatures,
title = {Rosh Pinah, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/rosh-pinah/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15