Description
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Recommended Concentrations and Limits
Certified Concentrations (at two Standard Deviations)
Au Pb Collection 1.28 0.12 g/t
Au PA 1.29 0.11 g/t
Ag 4A_MICP 0.3 0.08 ppm
Cu 4A_MICP 167 24 ppm
C Combustion/LECO 2.79 0.19 %
S 4A_MICP 0.63 0.07 %
LOI LOI 11.58 1.2 %
SG SG 2.74 0.15 Dimensionless
Al 4A_MICP 6.69 0.37 %
As 4A_MICP 245 23 ppm
Ba 4A_MICP 348 24 ppm
Be 4A_MICP 1 0.2 ppm
Bi 4A_MICP 0.2 0.05 ppm
Ca 4A_MICP 3.99 0.21 %
Cd 4A_MICP 0.1 0.03 ppm
Ce 4A_MICP 38 9 ppm
Co 4A_MICP 33 6 ppm
Cr 4A_MICP 256 18 ppm
Cs 4A_MICP 2 0.2 ppm
Fe 4A_MICP 5.66 0.32 %
Ga 4A_MICP 16 2 ppm
Hf 4A_MICP 3 0.8 ppm
In 4A_MICP 0.05 0.006 ppm
K 4A_MICP 1.53 0.10 %
La 4A_MICP 18 3 ppm
Li 4A_MICP 39 4 ppm
Lu 4A_MICP 0.2 0.07 ppm
Mg 4A_MICP 2.67 0.15 %
Mn 4A_MICP 1115 45 ppm
Mo 4A_MICP 2 0.9 ppm
Na 4A_MICP 1.37 0.070 %
Nb 4A_MICP 4 2 ppm
Ni 4A_MICP 217 16 ppm
P 4A_MICP 561 48 ppm
Pb 4A_MICP 14 3 ppm
Rb 4A_MICP 61 5 ppm
Re 4A_MICP 0.003 0.0009 ppm
Sb 4A_MICP 14 3 ppm
Sc 4A_MICP 21 2 ppm
Sn 4A_MICP 0.9 0.2 ppm
Sr 4A_MICP 269 21 ppm
Te 4A_MICP 0.1 0.04 ppm
Th 4A_MICP 4 0.4 ppm
Tl 4A_MICP 0.3 0.03 ppm
U 4A_MICP 12 2 ppm
V 4A_MICP 165 12 ppm
W 4A_MICP 8 3 ppm
Y 4A_MICP 14 2 ppm
Yb 4A_MICP 2 0.2 ppm
Zn 4A_MICP 78 11 ppm
Zr 4A_MICP 92 26 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Al2O3 XRF 12.80 0.14 %
CaO XRF 5.60 0.088 %
Cr2O3 XRF 0.045 0.009 %
Fe2O3 XRF 8.27 0.22 %
K2O XRF 1.84 0.052 %
MgO XRF 4.53 0.11 %
MnO XRF 0.15 0.002 %
Na2O XRF 1.83 0.11 %
P2O5 XRF 0.12 0.02 %
SiO2 XRF 51.58 0.63 %
TiO2 XRF 0.72 0.02 %
V2O5 XRF 0.033 0.009 %
Origin of Material
The material comes from a Geita gold deposit hosted within an Archean mesothermal orebody located in the Sukumaland Greenstones of the Geita Greenstone Belt. The deposit is largely hosted in a banded ironstone formation (BIF). Mineralisation is found where auriferous fluids, which are interpreted to have moved along shears often on BIF-diorite contacts, reacted with the BIF. Some lower-grade mineralisation can occur in the diorite as well (usually in association with BIF-hosted mineralisation).
Approximate Mineral and Chemical Composition
The mineralisation is associated with sulfidation fronts and replacements textures in ironstones and is mostly contained as disseminated sulphides in diorite. The major gangue mineral is magnetite with quartz, ankerite, and minor pyrrhotite and chalcopyrite. Approximately 20% of the gold is hosted in the diorite.
