Description
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AMIS0644 Au 0.151g/t U 58ppm Wits South Africa
Origin of Material
This standard is made from uranium bearing gold ore originating from the Ventersdorp, Contact Reef, Carbon Leader Reef and Vaal Reef. The uranium bearing ore was blended with low grade material of similar matrix to obtain the required grade.
Approximate Mineral and Chemical Composition
Throughout the Witwatersrand, gold ores occur in sheets or reefs originally deposited horizontally under water. The thickness of the reefs range between a lie of grit to several meters, with an average of 300mm. The sediments were also intersected by dykes and sills of dolomite, diabase and syenite intruding existing faults. The reefs can be in the form of either course conglomerates, rock pebbles and cemented in a silicate matrix. Pebbles usually derived from vein quarts, may also consist of quarzitic, chert jasper and quartz porphyry. The matrix consists of pure silica, but also contains minute flakes of muscovite and pyrophyllite as well as visible pyrite and other sulphides. The gold is usually confined to the matrix and tends to be concentrated along bedding planes (Vermeulen, 2001).
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method Certified (µ)8 (2s)10 ± Unit
Au Pb Collection1 0.151 0.015 g/t
U 4A_MICP2 53 6 ppm
U XRF3 58 14 ppm
Moisture Moisture4 0.28 0.02 %
SG SG5 2.78 0.16 Dimensionless
S Combustion/LECO6 0.53 0.04 %
S 4A_MICP 0.57 0.03 %
Al 4A_MICP 5.85 0.38 %
As 4A_MICP 110 9 ppm
Ba 4A_MICP 310 36 ppm
Be 4A_MICP 1 0.1 ppm
Bi 4A_MICP 0.9 0.05 ppm
Ca 4A_MICP 5693 454 ppm
Co 4A_MICP 36 3 ppm
Cr 4A_MICP 235 18 ppm
Cs 4A_MICP 2 0.2 ppm
Cu 4A_MICP 63 5 ppm
Fe 4A_MICP 2.05 0.18 %
Fe FUS7 2.07 0.27 %
Ga 4A_MICP 13 0.8 ppm
Hf 4A_MICP 3 0.4 ppm
K 4A_MICP 1.34 0.056 %
K FUS 1.25 0.14 %
Li 4A_MICP 9 0.8 ppm
Mg 4A_MICP 2331 188 ppm
Mg FUS 2359 305 ppm
Mn 4A_MICP 561 39 ppm
Mn FUS 537 59 ppm
Mo 4A_MICP 3 1 ppm
Na 4A_MICP 1536 150 ppm
Nb 4A_MICP 4 0.7 ppm
Ni 4A_MICP 92 9 ppm
P 4A_MICP 158 20 ppm
Pb 4A_MICP 88 4 ppm
Rb 4A_MICP 57 2 ppm
Sb 4A_MICP 3 0.5 ppm
Sr 4A_MICP 53 8 ppm
Ta 4A_MICP 0.6 0.2 ppm
Th 4A_MICP 23 4 ppm
Ti 4A_MICP 1038 127 ppm
Ti FUS 1639 95 ppm
Tl 4A_MICP 0.5 0.03 ppm
V 4A_MICP 42 5 ppm
W 4A_MICP 0.6 0.2 ppm
Y 4A_MICP 9 2 ppm
Zn 4A_MICP 144 10 ppm
Zr 4A_MICP 100 31 ppm
