OREAS 238c

OREAS 238c was prepared from a blend of gold ore sourced primarily from the Fosterville Gold Mine, Victoria, Australia, and is representative of orogenic gold mineralisation within the Lachlan Fold Belt. Barren hornfels and basalt were included, together with a minor proportion of gold ore from the Stawell Gold Mine, Victoria, Australia, to achieve the target grade and matrix composition.

Fifty-three commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:

  • Gold by Pb collection fire assay (25-50 g charge weight)
    with AAS, ICP-OES or ICP-MS finish
  • Gold by PhotonAssay™ with a recommended gross fill mass of 525-555g
  • Gold by 15-50g aqua regia digestion with ICP-MS and AAS finish
  • Gold by cyanide leach (5-200g) via a variety of cyanide leach methods (LeachWELL tablets, alkaline added sodium cyanide solution and sodium cyanide liquor with LeachWELL powder) with ICP or AAS finish
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion

To confirm homogeneity, gold by instrumental neutron activation analysis (INAA) was undertaken on 20 x 85mg. This format enabled a nested ANOVA treatment of the INAA results to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 3.17 0.081 3.14 3.20 Pb Fire Assay
Au, Gold (ppm) 3.21 0.093 3.18 3.23 PhotonAssay
Au, Gold (ppm) 3.08 0.138 3.01 3.14 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 2.75 0.154 2.67 2.83 Cyanide Leach
Ag, Silver (ppm) 0.262 0.018 0.239 0.284 4-Acid Digestion
Al, Aluminium (wt.%) 6.43 0.129 6.24 6.63 4-Acid Digestion
As, Arsenic (ppm) 776 29 749 803 4-Acid Digestion
Ba, Barium (ppm) 716 27 693 740 4-Acid Digestion
Be, Beryllium (ppm) 2.06 0.131 1.92 2.20 4-Acid Digestion
Bi, Bismuth (ppm) 0.31 0.024 0.28 0.34 4-Acid Digestion
Ca, Calcium (wt.%) 1.55 0.032 1.50 1.60 4-Acid Digestion
Cd, Cadmium (ppm) 0.067 0.012 0.055 0.079 4-Acid Digestion
Ce, Cerium (ppm) 76 3.5 72 80 4-Acid Digestion
Co, Cobalt (ppm) 17.8 0.45 17.0 18.5 4-Acid Digestion
Cr, Chromium (ppm) 122 15 113 130 4-Acid Digestion
Cs, Caesium (ppm) 7.49 0.262 7.22 7.76 4-Acid Digestion
Cu, Copper (ppm) 74 2.7 71 77 4-Acid Digestion
Dy, Dysprosium (ppm) 3.64 0.137 3.45 3.83 4-Acid Digestion
Er, Erbium (ppm) 1.72 0.080 1.58 1.85 4-Acid Digestion
Eu, Europium (ppm) 1.35 0.076 1.27 1.44 4-Acid Digestion
Fe, Iron (wt.%) 4.66 0.119 4.50 4.82 4-Acid Digestion
Ga, Gallium (ppm) 16.5 0.74 15.9 17.2 4-Acid Digestion
Gd, Gadolinium (ppm) 5.29 0.203 4.89 5.68 4-Acid Digestion
Hf, Hafnium (ppm) 3.99 0.203 3.77 4.21 4-Acid Digestion
Ho, Holmium (ppm) 0.65 0.049 0.59 0.71 4-Acid Digestion
In, Indium (ppm) 0.065 0.006 0.057 0.074 4-Acid Digestion
K, Potassium (wt.%) 2.25 0.037 2.19 2.32 4-Acid Digestion
La, Lanthanum (ppm) 37.6 1.57 36.1 39.2 4-Acid Digestion
Li, Lithium (ppm) 39.6 1.54 38.2 41.0 4-Acid Digestion
Lu, Lutetium (ppm) 0.27 0.015 0.24 0.30 4-Acid Digestion
Mg, Magnesium (wt.%) 1.68 0.044 1.62 1.73 4-Acid Digestion
Mn, Manganese (wt.%) 0.075 0.002 0.073 0.077 4-Acid Digestion
Mo, Molybdenum (ppm) 1.98 0.122 1.84 2.11 4-Acid Digestion
Na, Sodium (wt.%) 0.867 0.028 0.837 0.898 4-Acid Digestion
Nb, Niobium (ppm) 15.0 0.70 14.3 15.6 4-Acid Digestion
Nd, Neodymium (ppm) 33.8 1.29 32.1 35.5 4-Acid Digestion
Ni, Nickel (ppm) 59 1.9 57 61 4-Acid Digestion
P, Phosphorus (wt.%) 0.091 0.003 0.088 0.094 4-Acid Digestion
Pb, Lead (ppm) 18.7 0.89 17.8 19.6 4-Acid Digestion
Pr, Praseodymium (ppm) 8.86 0.267 8.53 9.19 4-Acid Digestion
Rb, Rubidium (ppm) 126 4 122 130 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.439 0.017 0.424 0.455 4-Acid Digestion
Sb, Antimony (ppm) 599 31 577 621 4-Acid Digestion
Sc, Scandium (ppm) 14.5 0.51 14.0 15.1 4-Acid Digestion
Sm, Samarium (ppm) 6.52 0.233 6.16 6.88 4-Acid Digestion
Sn, Tin (ppm) 2.97 0.167 2.82 3.11 4-Acid Digestion
Sr, Strontium (ppm) 155 5 149 161 4-Acid Digestion
Ta, Tantalum (ppm) 1.03 0.093 0.96 1.10 4-Acid Digestion
Tb, Terbium (ppm) 0.71 0.047 0.65 0.77 4-Acid Digestion
Te, Tellurium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 12.9 0.61 12.3 13.5 4-Acid Digestion
Ti, Titanium (wt.%) 0.505 0.013 0.487 0.523 4-Acid Digestion
Tl, Thallium (ppm) 0.64 0.032 0.60 0.68 4-Acid Digestion
Tm, Thulium (ppm) 0.25 0.010 0.22 0.27 4-Acid Digestion
U, Uranium (ppm) 2.55 0.109 2.39 2.70 4-Acid Digestion
V, Vanadium (ppm) 108 3 104 112 4-Acid Digestion
W, Tungsten (ppm) 2.68 0.201 2.45 2.91 4-Acid Digestion
Y, Yttrium (ppm) 16.9 0.79 15.9 17.9 4-Acid Digestion
Yb, Ytterbium (ppm) 1.66 0.095 1.56 1.76 4-Acid Digestion
Zn, Zinc (ppm) 88 2.7 85 92 4-Acid Digestion
Zr, Zirconium (ppm) 145 8 138 152 4-Acid Digestion
Ag, Silver (ppm) 0.251 0.011 0.236 0.265 Aqua Regia Digestion
Al, Aluminium (wt.%) 2.77 0.175 2.67 2.88 Aqua Regia Digestion
As, Arsenic (ppm) 758 24 738 778 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 199 10 191 207 Aqua Regia Digestion
Be, Beryllium (ppm) 1.24 0.14 1.15 1.33 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.31 0.021 0.28 0.33 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.731 0.030 0.708 0.755 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.050 0.008 0.039 0.061 Aqua Regia Digestion
Ce, Cerium (ppm) 40.7 3.91 37.9 43.4 Aqua Regia Digestion
Co, Cobalt (ppm) 16.2 0.52 15.7 16.7 Aqua Regia Digestion
Cr, Chromium (ppm) 111 4 107 115 Aqua Regia Digestion
Cs, Caesium (ppm) 6.03 0.236 5.79 6.27 Aqua Regia Digestion
Cu, Copper (ppm) 73 1.7 71 75 Aqua Regia Digestion
Dy, Dysprosium (ppm) 2.24 0.213 1.97 2.51 Aqua Regia Digestion
Er, Erbium (ppm) 1.02 0.096 0.90 1.14 Aqua Regia Digestion
Eu, Europium (ppm) 0.53 0.045 0.46 0.61 Aqua Regia Digestion
Fe, Iron (wt.%) 3.98 0.100 3.90 4.06 Aqua Regia Digestion
Ga, Gallium (ppm) 9.40 0.559 9.01 9.79 Aqua Regia Digestion
Gd, Gadolinium (ppm) 3.15 0.38 2.65 3.65 Aqua Regia Digestion
Ge, Germanium (ppm) 0.11 0.03 0.08 0.14 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.45 0.06 0.41 0.49 Aqua Regia Digestion
Hg, Mercury (ppm) 0.016 0.006 0.007 0.025 Aqua Regia Digestion
Ho, Holmium (ppm) 0.37 0.05 0.31 0.43 Aqua Regia Digestion
In, Indium (ppm) 0.047 0.004 0.044 0.049 Aqua Regia Digestion
K, Potassium (wt.%) 0.926 0.035 0.899 0.952 Aqua Regia Digestion
La, Lanthanum (ppm) 20.3 1.84 19.1 21.6 Aqua Regia Digestion
Li, Lithium (ppm) 27.6 1.61 26.3 28.9 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.11 0.008 0.10 0.12 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.29 0.040 1.25 1.33 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.058 0.002 0.057 0.060 Aqua Regia Digestion
Mo, Molybdenum (ppm) 1.85 0.113 1.74 1.96 Aqua Regia Digestion
Na, Sodium (wt.%) 0.202 0.012 0.192 0.212 Aqua Regia Digestion
Nd, Neodymium (ppm) 20.2 3.1 16.8 23.7 Aqua Regia Digestion
Ni, Nickel (ppm) 55 1.6 53 56 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.081 0.003 0.079 0.083 Aqua Regia Digestion
Pb, Lead (ppm) 8.22 0.394 7.80 8.64 Aqua Regia Digestion
Pr, Praseodymium (ppm) 5.01 1.06 3.94 6.07 Aqua Regia Digestion
Rb, Rubidium (ppm) 78 3.5 76 81 Aqua Regia Digestion
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion
S, Sulphur (wt.%) 0.439 0.018 0.426 0.452 Aqua Regia Digestion
Sb, Antimony (ppm) 459 62 426 491 Aqua Regia Digestion
Sc, Scandium (ppm) 9.43 0.408 9.07 9.80 Aqua Regia Digestion
Sm, Samarium (ppm) 3.71 0.52 3.18 4.24 Aqua Regia Digestion
Sn, Tin (ppm) 2.02 0.124 1.92 2.13 Aqua Regia Digestion
Sr, Strontium (ppm) 53 4.4 50 55 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.42 0.05 0.37 0.47 Aqua Regia Digestion
Te, Tellurium (ppm) 0.041 0.009 0.024 0.057 Aqua Regia Digestion
Th, Thorium (ppm) 8.47 0.741 7.95 8.98 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.257 0.012 0.249 0.266 Aqua Regia Digestion
Tl, Thallium (ppm) 0.44 0.027 0.41 0.46 Aqua Regia Digestion
Tm, Thulium (ppm) 0.13 0.02 0.10 0.15 Aqua Regia Digestion
U, Uranium (ppm) 1.22 0.12 1.13 1.31 Aqua Regia Digestion
V, Vanadium (ppm) 85 2.0 83 87 Aqua Regia Digestion
W, Tungsten (ppm) 0.94 0.091 0.84 1.04 Aqua Regia Digestion
Y, Yttrium (ppm) 9.54 0.491 9.17 9.90 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.79 0.063 0.70 0.89 Aqua Regia Digestion
Zn, Zinc (ppm) 76 2.7 74 79 Aqua Regia Digestion
Zr, Zirconium (ppm) 19.4 1.50 18.3 20.4 Aqua Regia Digestion
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