OREAS 232

OREAS 232 was prepared from a blend of high grade gold-bearing ore and barren
metasediments. The ore was sourced from the Fosterville Mine, located 20km from
the city of Bendigo in the state of Victoria, Australia. The deposit is hosted
by a metamorphosed interbedded turbidite sequence of sandstones, siltstones and
shales. Primary gold mineralization occurs as disseminated arsenopyrite and
pyrite in a quartz–carbonate veinlet stockwork. Primary gold also occurs as
visible gold where it variably overprints sulphide mineralization and is found
as disseminated fine specks (>1 mm) of gold within host quartz veins. The
visible gold is spatially associated with antimony mineralization, in the form
of stibnite that occurs with quartz and varies from replacement and infill of
earlier quartz-carbonate stockwork veins, to massive stibnite-only veins of up
to 0.5m in width (Hitchman, Philips, & Greenberger, 2017).


Thirty four commercial analytical laboratories participated in the program to
certify the elements reported in Table 1. The following methods were
employed:



  • Gold via 15-50g fire assay with AAS finish (27 laboratories) and ICP-OES
    (7 laboratories) finish;
  • Gold via 15-50g aqua regia digestion with ICP-MS finish (13 laboratories),
    AAS (11 laboratories) and ICP-OES (1 laboratory) finish;
  • Gold by cyanide leach – A variety of cyanide leach methods were undertaken
    by the participating laboratories including the use of LeachWELL tablets,
    alkaline added sodium cyanide solution as well as sodium cyanide liquor with
    LeachWELL powder. The sample weights included: 10g (1 laboratory by ICP-OES
    finish), 30g (9 laboratories by AAS finish and 1 laboratory by ICP-MS finish),
    50g (1 laboratory by AAS finish and 1 laboratory by ICP-MS finish) and 200g (6
    laboratories by AAS finish and 1 laboratory by ICP-MS finish);
  • Aqua regia digestion for full elemental suite ICP-OES and ICP-MS finish
    (up to 23 laboratories depending on the element).

Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Au, Gold (ppm) 0.902 0.023 0.895 0.909 Pb Fire Assay
Au, Gold (ppm) 0.873 0.042 0.858 0.889 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 0.803 0.050 0.780 0.826 Cyanide Leach
Ag, Silver (ppm) 0.093 0.007 0.089 0.096 Aqua Regia Digestion
Al, Aluminium (wt.%) 2.47 0.113 2.41 2.53 Aqua Regia Digestion
As, Arsenic (ppm) 185 8 181 188 Aqua Regia Digestion
Ba, Barium (ppm) 97 13 91 103 Aqua Regia Digestion
Be, Beryllium (ppm) 1.19 0.084 1.14 1.25 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.31 0.020 0.30 0.32 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.187 0.015 0.180 0.194 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.032 0.006 0.030 0.034 Aqua Regia Digestion
Ce, Cerium (ppm) 58 12 52 65 Aqua Regia Digestion
Co, Cobalt (ppm) 12.5 0.61 12.1 12.8 Aqua Regia Digestion
Cr, Chromium (ppm) 100 3 99 101 Aqua Regia Digestion
Cs, Caesium (ppm) 7.45 0.368 7.25 7.66 Aqua Regia Digestion
Cu, Copper (ppm) 22.6 1.28 22.0 23.1 Aqua Regia Digestion
Dy, Dysprosium (ppm) 2.25 0.33 1.94 2.57 Aqua Regia Digestion
Er, Erbium (ppm) 1.00 0.052 0.95 1.04 Aqua Regia Digestion
Eu, Europium (ppm) 0.80 0.19 0.54 1.05 Aqua Regia Digestion
Fe, Iron (wt.%) 3.41 0.207 3.32 3.50 Aqua Regia Digestion
Ga, Gallium (ppm) 7.53 0.675 7.21 7.86 Aqua Regia Digestion
Gd, Gadolinium (ppm) 3.78 0.74 3.06 4.51 Aqua Regia Digestion
Ge, Germanium (ppm) 0.099 0.010 0.089 0.108 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.78 0.11 0.71 0.84 Aqua Regia Digestion
Ho, Holmium (ppm) 0.39 0.05 0.32 0.46 Aqua Regia Digestion
In, Indium (ppm) 0.023 0.003 0.022 0.024 Aqua Regia Digestion
K, Potassium (wt.%) 0.972 0.042 0.951 0.993 Aqua Regia Digestion
La, Lanthanum (ppm) 29.8 5.4 27.3 32.4 Aqua Regia Digestion
Li, Lithium (ppm) 33.9 2.93 32.3 35.4 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.12 0.02 0.10 0.13 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.30 0.080 1.26 1.33 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.021 0.001 0.020 0.021 Aqua Regia Digestion
Mo, Molybdenum (ppm) 0.57 0.048 0.54 0.60 Aqua Regia Digestion
Na, Sodium (wt.%) 0.074 0.011 0.069 0.079 Aqua Regia Digestion
Ni, Nickel (ppm) 57 3.3 55 58 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.050 0.003 0.049 0.052 Aqua Regia Digestion
Pb, Lead (ppm) 7.74 0.612 7.38 8.10 Aqua Regia Digestion
Pr, Praseodymium (ppm) 7.63 1.39 6.10 9.16 Aqua Regia Digestion
Rb, Rubidium (ppm) 94 6.3 91 98 Aqua Regia Digestion
S, Sulphur (wt.%) 0.050 0.005 0.048 0.052 Aqua Regia Digestion
Sb, Antimony (ppm) 133 24 122 145 Aqua Regia Digestion
Sc, Scandium (ppm) 5.80 0.299 5.67 5.94 Aqua Regia Digestion
Sm, Samarium (ppm) 5.14 0.94 4.11 6.17 Aqua Regia Digestion
Sn, Tin (ppm) 1.30 0.086 1.25 1.34 Aqua Regia Digestion
Sr, Strontium (ppm) 15.5 0.63 15.1 15.8 Aqua Regia Digestion
Tb, Terbium (ppm) 0.45 0.07 0.38 0.52 Aqua Regia Digestion
Th, Thorium (ppm) 13.1 0.99 12.7 13.6 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.146 0.020 0.137 0.156 Aqua Regia Digestion
Tl, Thallium (ppm) 0.59 0.037 0.57 0.61 Aqua Regia Digestion
U, Uranium (ppm) 1.51 0.093 1.46 1.57 Aqua Regia Digestion
V, Vanadium (ppm) 67 2.6 66 68 Aqua Regia Digestion
W, Tungsten (ppm) 0.38 0.04 0.36 0.41 Aqua Regia Digestion
Y, Yttrium (ppm) 9.53 0.934 9.04 10.02 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.86 0.11 0.71 1.00 Aqua Regia Digestion
Zn, Zinc (ppm) 75 4.8 72 77 Aqua Regia Digestion
Zr, Zirconium (ppm) 28.1 5.5 25.4 30.9 Aqua Regia Digestion
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