Description
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AMIS0592 Cr 10.02 % ultramafic Great Dyke Zimbabwe
Origin of Material
The material was sourced from African Chrome Field’s (ACF) alluvial chrome mining concessions located in the Great Dyke region of Mashonaland and Midlands provinces of Central Zimbabwe.
The Great Dyke is a layered mafic intrusion of igneous, metal-bearing rocks that was formed approximately 2.5 billion years ago. The chrome ores are located in seams along the flanks of the centre part of the Great Dyke.
Approximate Mineral and Chemical Composition
Chromite occurs to the base of the Ultramafic Sequence and is mined throughout the Great Dyke.
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method 7(µ) 10 ± (2s) Unit
Cr XRF1 10.02 0.53 %
C Combustion/LECO2 8481 219 ppm
LOI LOI3 5.33 0.21 %
SG SG4 3.175 0.26 Dimensionless
Al FUS5 3.23 0.78 %
As 4A_MICP6 12 2 ppm
Ba 4A_MICP 97 17 ppm
Ca 4A_MICP 770 123 ppm
Ce 4A_MICP 14 3 ppm
Co 4A_MICP 383 37 ppm
Cs 4A_MICP 0.5 0.05 ppm
Fe 4A_MICP 20.02 1.1 %
Ga 4A_MICP 14 1 ppm
Hf 4A_MICP 1.0 0.5 ppm
La 4A_MICP 6 0.9 ppm
Li 4A_MICP 15 2 ppm
Mn 4A_MICP 1935 167 ppm
Mn FUS 2122 237 ppm
Mo 4A_MICP 1 0.1 ppm
Nb 4A_MICP 3 0.2 ppm
Ni 4A_MICP 4290 61 ppm
P 4A_MICP 259 37 ppm
Rb 4A_MICP 16 1 ppm
Sb 4A_MICP 5 0.8 ppm
Sc 4A_MICP 10 1 ppm
Sr 4A_MICP 11 0.4 ppm
Ta 4A_MICP 0.2 0.02 ppm
Th 4A_MICP 3 0.1 ppm
Ti 4A_MICP 2458 279 ppm
Tl 4A_MICP 0.1 0.03 ppm
U 4A_MICP 8 0.3 ppm
W 4A_MICP 0.6 0.10 ppm
Y 4A_MICP 4 0.8 ppm
Zr 4A_MICP 38 2 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method 7(µ) 10 ± (2s) Unit
Al2O3 FUS 6.10 1.00 %
Al2O3 XRF 6.40 0.044 %
CaO XRF 0.12 0.01 %
Cr2O3 XRF 14.65 0.78 %
Fe2O3 XRF 29.05 0.40 %
K2O XRF 0.33 0.01 %
MgO XRF 8.04 0.11 %
MnO FUS 0.27 0.03 %
MnO XRF 0.26 0.02 %
SiO2 FUS 36.60 15.0 %
SiO2 XRF 34.01 0.40 %
TiO2 XRF 0.44 0.02 %
V2O5 XRF 0.070 N/A %
