Mokta (Grand Lahou)
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Location - Côte d'Ivoire
Age (of protore) - Birimian: 2100-2000
Original size -1.3 million tonnes of Mn
References
Varentsov, I.M., 1996, Manganese Ores of Supergene Zone: Geochemistry of Formation: Dordrecht, Kluwer Academic Publishers, 342 pp.
Grandin, G., and Perseil, E.A., 1977, Le gisement de manganèse de Mokta (Côte d'Ivoire): Transformations minéralogiques des minerais par action météorique: Bull soc geol France 7, p. 309-317.
Perseil, E. A., and Grandin, G. , 1978, Evolution mineralogique du manganèse dans trois gisements d'Afrique de l'Ouest; Mokta, Tambao, Nsuta: Mineralium Deposita, v. 13, p. 295-311.
major elements - trace elements - rare-earth elements - REE normalized - isotopes
Major Elements, oxide percent
|
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sample number and type
|
% |
% |
% |
% |
% |
% |
% |
% |
% |
% |
% |
|
MnO |
Fe2O3t |
SiO2 |
Al203 |
CaO |
MgO |
K2O |
Na2O |
TiO2 |
P205 |
LOI |
||
Average
|
Mn oxide |
66.0 |
2.17 |
6.18 |
4.19 |
0.26 |
0.28 |
0.13 |
0.81 |
0.25 |
5.64 |
|
| 1 | supergene ore | 78.9 | 0.24 | 0.00 | 0.38 | 0.12 | 0.02 | 0.43 | 0.14 | 3.00 | ||
| 2 | supergene ore | 73.1 | 0.50 | 1.00 | 3.42 | 0.06 | bd | 1.46 | 0.39 | 5.00 | ||
| 3 | supergene ore | 72.3 | 0.90 | 1.00 | 3.60 | 0.06 | bd | 1.66 | 0.45 | 5.80 | ||
| 4 | supergene ore | 71.5 | 1.76 | 1.80 | 2.95 | 0.14 | 0.07 | 0.44 | 0.13 | 5.50 | ||
| 5 | supergene ore | 69.9 | 2.16 | 3.50 | 2.60 | 0.23 | 0.07 | 0.42 | 0.21 | 4.40 | ||
| 6 | supergene ore | 64.7 | 2.41 | 9.70 | 3.54 | 0.70 | 0.30 | 0.32 | 0.15 | 5.20 | ||
| 7 | supergene ore | 60.4 | 3.88 | 0.90 | 9.50 | 0.26 | 0.06 | 0.11 | 1.46 | 0.39 | 8.80 | |
| 8 | supergene ore | 59.9 | 3.00 | 11.5 | 4.67 | 0.80 | 0.20 | 0.64 | 0.20 | 6.30 | ||
| 9 | supergene ore | 43.5 | 4.66 | 26.2 | 7.08 | 0.35 | 0.44 | 0.15 | 6.78 | |||
| 10 | protore | 3.68 | 1.73 | 83.4 | 5.52 | 0.34 | 3.30 | |||||
Trace elements, ppm
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
|||
|
As |
Ba |
Cd |
Co |
Cr |
Cu |
Mo |
Nb |
Ni |
Pb |
Rb |
Sc |
Sr |
Th |
U |
V |
Y |
Zn |
Zr |
|||
74
|
nr |
|
nr |
|
nr |
nr |
nr |
nr |
|
nr |
nr |
nr |
nr |
nr |
nr |
nr |
nr |
nr |
nr |
|||
blank or nr = not reported; bd = below detection
Rare-earth elements, ppm
|
||||||||||||||
| Sample | La |
Ce |
Pr |
Nd |
Sm |
Eu |
Gd |
Tb |
Dy |
Ho |
Er |
Tm |
Yb |
Lu |
Rare-earth elements, normalized to chondritic values of Taylor & McLennan (1992) |
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Sample |
LaN |
CeN |
PrN |
NdN |
SmN |
EuN |
GdN |
TbN |
YbN |
Ce/Ce* |
Eu/Eu* |
LaN/YbN |
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Isotopes |
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Sample |
TC % | TOC % | Ccarb % | δ13C pdb | δ18O pdb | δ18O smow | Stotal % | δ34S sulfide | 87Sr/86Sr |