Gounkoto
Kayes (Loulo district, Senegal-Mali shear zone), Mali
Orogenic goldAu
- Type
- Birimian orogenic gold, in a jog zone
A recent discovery (2009), part of the Loulo-Gounkoto complex mined by Barrick. Mineralisation lies in a jog zone where metamorphic and magmatic fluids mixed, with albitisation, hydrothermal breccias and carbonate-pyrite cement. Lawrence et al. (2013) studied it for strontium and sulfur isotopes and tourmaline boron isotopes.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 8.6 ± 2 ‰ | 5.8 / 12.8 ‰ | 18 | auriferous pyrite (jog zone) Auriferous pyrite of the jog zone (18 analyses). The heavy values are attributed to reduction of sulfate held in diagenetic evaporitic sequences. Partial fluid mixing in this zone promotes phase separation and gold deposition. | Lawrence et al. 2015, The Gounkoto Au deposit West Africa: Constraints on ore genesis and… |
| 8.8 ‰ | auriferous arsenopyrite (one analysis) A single value on auriferous arsenopyrite, in good agreement with the pyrite mean (8.6 ‰), confirming a single sulfur source for the main ore. | Lawrence et al. 2015, Ore Geology Reviews |
Deposits of the same type
- Loulo (district de Gara-Yalea) Mali
- Massawa Senegal
- Ashanti (Obuasi) Ghana
- Muruntau Uzbekistan
- Kalgoorlie (Golden Mile) Australia
- Victorian Goldfields Australia
Cite this page
IsoFind Atlas (2026). Gounkoto, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/gounkoto/ (accessed 2026-10-06).
@misc{isofind2026gounkotoisotopesignatures,
title = {Gounkoto, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/gounkoto/},
note = {Accessed 2026-10-06}
}Updated : 2026-10-06