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Au 26.75g/t U 660 ppm Wits South Africa

Category: GOLD MULTI-ELEMENT CONCENTRATE 
Product Code: AMIS 0553

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AMIS0553 Au 26.75g/t U 660 ppm 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

Au Pb Collection1 26.75 3.02 g/t
U 4A_MICP2 629 109 ppm
U XRF3 660 40 ppm
U3O8 XRF 0.078 0.005 %
LOI LOI4 2.10 0.15 %
S 4A_MICP 1.94 0.27 %
S Combustion/LECO5 1.90 0.059 %
SG SG6 2.76 0.070 Dimensionless
Ag 4A_MICP 2.89 0.59 ppm
As 4A_MICP 203 20 ppm
Ba 4A_MICP 62 7 ppm
Be 4A_MICP 0.5 0.1 ppm
Bi 4A_MICP 2 0.2 ppm
Ca 4A_MICP 488 50 ppm
Cd 4A_MICP 3 0.5 ppm
Ce 4A_MICP 45 13 ppm
Co 4A_MICP 56 6 ppm
Cr 4A_MICP 379 55 ppm
Cs 4A_MICP 1 0.1 ppm
Cu 4A_MICP 80 12 ppm
Dy 4A_MICP 6 1 ppm
Er 4A_MICP 3 1 ppm
Eu 4A_MICP 1 0.2 ppm
Fe 4A_MICP 32758 1853 ppm
Ga 4A_MICP 4 1 ppm
Gd 4A_MICP 5 0.5 ppm
Hf 4A_MICP 2 0.9 ppm
Ho 4A_MICP 1 0.4 ppm
In 4A_MICP 0.1 0.02 ppm
K 4A_MICP 2959 164 ppm
La 4A_MICP 22 5 ppm
Li 4A_MICP 5 1 ppm
Lu 4A_MICP 0.2 0.1 ppm
Mg 4A_MICP 1628 103 ppm
Mn 4A_MICP 137 7 ppm
Mo 4A_MICP 3 0.5 ppm
Na 4A_MICP 859 186 ppm
Nb 4A_MICP 3 1 ppm
Nd 4A_MICP 20 4 ppm
Ni 4A_MICP 114 8 ppm
Pb 4A_MICP 225 19 ppm
Pr 4A_MICP 5 1 ppm
Rb 4A_MICP 13 3 ppm
Sb 4A_MICP 7 2 ppm
Sc 4A_MICP 3 0.6 ppm
Sm 4A_MICP 5 0.6 ppm
Sn 4A_MICP 1 0.5 ppm
Sr 4A_MICP 30 2 ppm
Tb 4A_MICP 1 0.3 ppm
Te 4A_MICP 0.5 0.1 ppm
Th 4A_MICP 49 3 ppm
Tl 4A_MICP 0.2 0.1 ppm
Tm 4A_MICP 0.3 0.1 ppm
V 4A_MICP 16 4 ppm
W 4A_MICP 1 0.2 ppm
Y 4A_MICP 18 7 ppm
Yb 4A_MICP 2 0.4 ppm
Zn 4A_MICP 335 27 ppm
Zr 4A_MICP 98 23 ppm


Major Oxides
Certified Concentrations (at two Standard Deviations)

Al2O3 FUS 3.03 0.11 %
Al2O3 XRF 3.14 0.068 %
CaO XRF 0.057 0.01 %
Cr2O3 XRF 0.066 0.01 %
Fe2O3 FUS 4.39 0.22 %
Fe2O3 XRF 4.50 0.10 %
K2O XRF 0.350 0.0083 %
MgO FUS 0.262 0.039 %
MgO XRF 0.269 0.033 %
SiO2 XRF 88.67 1.50 %
TiO2 XRF 0.155 0.010 %

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