Description
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AMIS0694 Au 72.42 g/t U 5568 ppm Wits South Africa
Origin of Material
The material is from Orkney – North West SA (Kopanang shaft previously owned by Anglo-gold Ashanti, Vaal Reef, Carbonaceous Gold ore material.
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 8(µ) 10 ± (2s) Unit
Au 1Pb Collection 72.42 8.5 g/t
U 24A_MICP 5568 516 ppm
C 3Combustion/LECO 1.2 0.06 %
S 4A_MICP 5.3 0.3 %
S Combustion/LECO 5.4 0.4 %
LOI 4LOI 5.8 0.4 %
Moisture 5Moisture 0.23 0.4 %
SG 6SG 3 0.1 Dimensionless
Ag 4A_MICP 6 2 ppm
Al 4A_MICP 3.1 0.2 %
As 4A_MICP 1243 88 ppm
Ba 4A_MICP 227 27 ppm
Be 4A_MICP 4 0.4 ppm
Bi 4A_MICP 8 0.5 ppm
Ca 4A_MICP 1277 133 ppm
Cd 4A_MICP 1 0.3 ppm
Ce 4A_MICP 511 52 ppm
Co 4A_MICP 287 24 ppm
Cr 4A_MICP 664 284 ppm
Cs 4A_MICP 8 0.5 ppm
Cu 4A_MICP 137 15 ppm
Fe 4A_MICP 6.5 0.8 %
Ga 4A_MICP 9 2 ppm
Ge 4A_MICP 1 1 ppm
Hf 4A_MICP 26 11 ppm
In 4A_MICP 0.1 0.01 ppm
K 4A_MICP 8051 522 ppm
La 4A_MICP 266 15 ppm
Li 4A_MICP 10 1 ppm
Mg 4A_MICP 1980 167 ppm
Mn 4A_MICP 367 24 ppm
Mo 4A_MICP 5 0.6 ppm
Na 4A_MICP 1200 130 ppm
Nb 4A_MICP 23 2 ppm
Ni 4A_MICP 645 49 ppm
Pb 4A_MICP 2567 338 ppm
Rb 4A_MICP 41 2 ppm
Sb 4A_MICP 28 5 ppm
Sc 4A_MICP 11 0.9 ppm
Sr 4A_MICP 133 9 ppm
Ta 4A_MICP 10 0.8 ppm
Th 4A_MICP 614 24 ppm
Tl 4A_MICP 1 0.02 ppm
V 4A_MICP 26 4 ppm
W 4A_MICP 2 0.4 ppm
Y 4A_MICP 207 29 ppm
Zn 4A_MICP 288 33 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method 8(µ) 10 ± (2s) Unit
U3O8 4A_MICP 0.66 0.06 %
U3O8 7XRF 0.61 0.2 %
Al2O3 XRF 5.9 0.1 %
CaO XRF 0.17 0.01 %
Fe2O3 XRF 9.4 0.5 %
K2O XRF 0.98 0.02 %
MgO XRF 0.37 0.08 %
MnO XRF 0.050 0.02 %
Na2O XRF 0.19 0.10 %
P2O5 XRF 0.15 0.01 %
SiO2 XRF 73.05 1.6 %
TiO2 XRF 0.54 0.03 %
