Lafigué

North-central, Oumé-Fétékro greenstone belt (Fétékro project), Côte d'Ivoire

Orogenic goldAu

Type: Orogenic gold in fault veins and extension veins along thrusts

Paleoproterozoic (Birimian) deposit in the northern Toumodi-Fétékro belt, indicated resource of 2.5 Moz gold at 2.40 g/t; metagabbro, metabasalts and metagranodiorite cut by a NNE-SSW sinistral shear zone (D2) with a contractional jog of south-dipping E-W thrusts. Quartz-calcite-tourmaline-sulphide-gold veins; barren tourmaline 2a and auriferous 2b. Hauteville et al. (2025): homogeneous δ11B from -20.1 to -18.1 ‰ along a zoned grain, crystallization by successive fluid discharges related to fault-valve behaviour.

δ11B in ‰ (per mil) Values of the same system

Standard : NIST SRM 951

Value	Range	n	Mineral or matrix	Source
−19.18 ± 0.51 ‰	−20.06 / −18.25 ‰	24	auriferous tourmaline 2b, core and dark growth bands Mean and standard deviation recalculated from 24 analyses, -20.06 to -18.25 (1 -19.31; 2 -18.91; 3 -19.96; 4 -20.06; 5 -20.00; 6 -19.66; 7 -19.40; 8 -19.36; 9 -19.67; 35 -19.30; 36 -19.58; 37 -19.38; 38 -18.97; 39 -19.10; 40 -18.74; 41 -19.21; 42 -19.00; 43 -19.09; 44 -18.79; 45 -18.38; 46 -18.30; 52 -18.25; 53 -18.63; 54 -19.31). Analysis 1 in the core (-19.31 ‰), the others in the dark bands. #Mg 0.55 to 0.63 in the dark bands; no clear link between #Mg and δ11B.	Hauteville et al. (2025), Tourmaline as a textural, geochemical and isotopic marker of fa…
−19.22 ± 0.4 ‰	−19.89 / −18.11 ‰	32	auriferous tourmaline 2b, light growth bands Mean and standard deviation recalculated from 32 analyses, -19.89 to -18.11 (10 -19.63; 11 -19.58; 12 -19.65; 13 -18.78; 14 -18.88; 15 -19.27; 16 -19.48; 17 -18.89; 18 -19.28; 19 -19.68; 20 -19.71; 21 -18.94; 22 -19.12; 23 -19.29; 24 -19.09; 25 -19.41; 26 -19.89; 27 -19.38; 28 -19.62; 29 -19.69; 30 -19.26; 31 -19.25; 32 -19.18; 33 -19.39; 34 -19.28; 47 -19.12; 48 -18.11; 49 -19.20; 50 -18.70; 51 -18.34; 55 -18.69; 56 -19.11). Same grain; #Mg 0.53 to 0.61. The discussion text gives -18.3 ‰ for the deposit maximum, the table gives -18.11 ‰ (analysis 48).	Hauteville et al. (2025), Tourmaline as a textural, geochemical and isotopic marker of fa…

Deposits of the same type

Cite this page

IsoFind Atlas (2026). Lafigué, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/lafigue/ (accessed 2026-10-20).

@misc{isofind2026lafigueisotopesignatures,
  title = {Lafigué, isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/deposits/lafigue/},
  note = {Accessed 2026-10-20}
}

Updated : 2026-10-20