Description
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AMIS0729 Au 1.12g/t U 53ppm Wits South Africa
Origin of Material
The standard was made using material from the Ventersdorp Contact Reef of the Witwatersrand Basin.
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).
Certified Concentrations
Analyte Method 8(µ) 10 ± (2s) Unit
Au 1Pb Collection 1.12 0.20 g/t
U 24A_MICP 53 6 ppm
U 3FUS 54 2 ppm
C 4Combustion/LECO 2317 363 ppm
S 4A_MICP 1.29 0.099 %
S Combustion/LECO 1.25 0.11 %
LOI 5LOI 1.76 0.072 %
SG 6SG 2.78 0.12 Dimensionless
Ag 4A_MICP 0.9 0.2 ppm
Al 4A_MICP 1.88 0.22 %
Al FUS 1.97 0.095 %
As 4A_MICP 285 44 ppm
Ba 4A_MICP 105 12 ppm
Ba FUS 103 8 ppm
Be 4A_MICP 0.3 0.05 ppm
Bi 4A_MICP 2 0.4 ppm
Ca 4A_MICP 4453 284 ppm
Ca FUS 4450 656 ppm
Cd 4A_MICP 0.2 0.08 ppm
Ce 4A_MICP 37 3 ppm
Ce FUS 37 2 ppm
Co 4A_MICP 42 5 ppm
Co FUS 42 4 ppm
Cr FUS 475 81 ppm
Cs 4A_MICP 0.9 0.1 ppm
Cu 4A_MICP 40 6 ppm
Dy 4A_MICP 2 0.5 ppm
Dy FUS 2 0.3 ppm
Er 4A_MICP 0.8 0.3 ppm
Er FUS 1 0.3 ppm
Eu 4A_MICP 0.4 0.3 ppm
Eu FUS 0.5 0.02 ppm
Fe 4A_MICP 2.23 0.18 %
Fe FUS 2.24 0.054 %
Ga 4A_MICP 5 1 ppm
Ga FUS 6 0.6 ppm
Gd 4A_MICP 2 0.4 ppm
Gd FUS 3 0.5 ppm
Hf 4A_MICP 2 0.4 ppm
Hf FUS 3 1 ppm
Ho 4A_MICP 0.3 0.1 ppm
K 4A_MICP 4848 270 ppm
K FUS 4999 293 ppm
La 4A_MICP 19 1 ppm
La FUS 19 0.9 ppm
Li 4A_MICP 6 0.4 ppm
Lu 4A_MICP 0.1 0.03 ppm
Mg 4A_MICP 2109 104 ppm
Mg FUS 2178 80 ppm
Mn 4A_MICP 7873 312 ppm
Mn FUS 8044 189 ppm
Mo 4A_MICP 8 0.9 ppm
Mo FUS 9 2 ppm
Na 4A_MICP 475 86 ppm
Nb 4A_MICP 2 0.4 ppm
Nd 4A_MICP 15 1 ppm
Nd FUS 15 0.5 ppm
Ni 4A_MICP 95 5 ppm
P 4A_MICP 86 23 ppm
Pb 4A_MICP 57 7 ppm
Analyte Method 8(µ) 10 ± (2s) Unit
Pr 4A_MICP 4 0.3 ppm
Pr FUS 4 0.4 ppm
Rb 4A_MICP 21 3 ppm
Rb FUS 21 2 ppm
Sb 4A_MICP 2 0.3 ppm
Sb FUS 2 0.3 ppm
Sc 4A_MICP 3 0.7 ppm
Si FUS 42.08 2.2 %
Sm 4A_MICP 3 0.1 ppm
Sm FUS 3 0.3 ppm
Sn 4A_MICP 1 0.6 ppm
Sr 4A_MICP 20 3 ppm
Sr FUS 21 2 ppm
Ta 4A_MICP 0.6 0.1 ppm
Tb 4A_MICP 0.3 0.07 ppm
Th 4A_MICP 9 0.8 ppm
Th FUS 9 1 ppm
Ti FUS 697 17 ppm
Tl 4A_MICP 0.2 0.06 ppm
Tm 4A_MICP 0.1 0.02 ppm
V 4A_MICP 17 3 ppm
W 4A_MICP 4 0.7 ppm
Y 4A_MICP 7 2 ppm
Y FUS 11 0.8 ppm
Yb 4A_MICP 0.8 0.2 ppm
Yb FUS 1 0.2 ppm
Zn 4A_MICP 60 9 ppm
Zr 4A_MICP 52 13 ppm
Zr FUS 109 27 ppm
