OREAS 523b

OREAS 523b was prepared from a blend of iron oxide copper-gold (IOCG) ore, barren rhyodacite and iron oxide ore. The IOCG ore was sourced from the Ernest Henry Mine located about 38 kilometres north-east of Cloncurry in north-west Queensland.

IOCG mineralisation at the Ernest Henry Mine is hosted in breccia comprising strongly altered and replaced felsic volcanic fragments in a matrix largely composed of magnetite, calcite, pyrite, biotite, chalcopyrite, K feldspar titanite and quartz. Accessory minerals include garnet, barite, molybdenite, fluorite, amphibole, apatite, monazite, arsenopyrite, a LREE fluorcarbonate, galena, cobaltite, sphalerite, scheelite, uraninite and tourmaline. Copper occurs as native copper, bornite and chalcopyrite. Gold occurs mainly in the molecular framework of the chalcopyrite. Significant levels of cobalt, molybdenum, rare earth elements and low levels of uranium are also present.

Twenty-nine commercial analytical laboratories participated in the program to certify the elements reported below. The following methods were employed:

  • Gold by fire assay (25-50g charge weight) with AAS, ICP-OES or ICP-MS finish
  • Gold by aqua regia digestion (15-30g sample weight) with AAS, ICP-OES or ICP-MS 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
  • Full ICP-OES and ICP-MS elemental suites by peroxide fusion
  • Ag, As, Cu, Co, Fe, Mo and S by 3-acid (HNO3-HClO4-HCl) digestion with ICP-OES finish
  • Total Sulphur by infrared combustion furnace and
  • Fluorine by various methods.

Instrumental neutron activation analysis for Au on 20 x 85mg subsamples was also undertaken at ANSTO, Lucas Heights to confirm homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Cu, Copper (wt.%) 1.66 0.041 1.63 1.69 4-Acid Digestion
Au, Gold (ppm) 1.05 0.029 1.04 1.06 Pb Fire Assay
Co, Cobalt (ppm) 247 10 237 257 4-Acid Digestion
Au, Gold (ppm) 1.03 0.067 0.99 1.06 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 3.18 0.126 3.00 3.36 4-Acid Digestion
Al, Aluminium (wt.%) 5.32 0.174 5.15 5.49 4-Acid Digestion
As, Arsenic (ppm) 157 8 150 164 4-Acid Digestion
Be, Beryllium (ppm) 1.83 0.145 1.71 1.95 4-Acid Digestion
Bi, Bismuth (ppm) 8.47 0.398 8.09 8.86 4-Acid Digestion
Ca, Calcium (wt.%) 2.04 0.076 1.98 2.11 4-Acid Digestion
Cd, Cadmium (ppm) 0.40 0.04 0.36 0.45 4-Acid Digestion
Ce, Cerium (ppm) 100 7.2 92 107 4-Acid Digestion
Cr, Chromium (ppm) 36.2 3.9 33.1 39.4 4-Acid Digestion
Cs, Caesium (ppm) 2.53 0.097 2.42 2.64 4-Acid Digestion
Dy, Dysprosium (ppm) 3.86 0.196 3.63 4.08 4-Acid Digestion
Er, Erbium (ppm) 1.89 0.105 1.72 2.06 4-Acid Digestion
Eu, Europium (ppm) 1.55 0.111 1.42 1.69 4-Acid Digestion
Fe, Iron (wt.%) 17.07 0.862 16.41 17.72 4-Acid Digestion
Ga, Gallium (ppm) 17.3 1.04 16.5 18.1 4-Acid Digestion
Gd, Gadolinium (ppm) 5.20 0.224 4.83 5.57 4-Acid Digestion
Ge, Germanium (ppm) 0.23 0.04 0.19 0.27 4-Acid Digestion
Hf, Hafnium (ppm) 4.94 0.257 4.67 5.21 4-Acid Digestion
Ho, Holmium (ppm) 0.71 0.027 0.66 0.76 4-Acid Digestion
In, Indium (ppm) 0.38 0.021 0.35 0.40 4-Acid Digestion
K, Potassium (wt.%) 3.05 0.105 2.95 3.14 4-Acid Digestion
La, Lanthanum (ppm) 77 7.4 72 82 4-Acid Digestion
Li, Lithium (ppm) 15.7 1.00 14.9 16.5 4-Acid Digestion
Lu, Lutetium (ppm) 0.27 0.021 0.25 0.29 4-Acid Digestion
Mg, Magnesium (wt.%) 0.611 0.026 0.590 0.632 4-Acid Digestion
Mn, Manganese (wt.%) 0.175 0.005 0.169 0.180 4-Acid Digestion
Mo, Molybdenum (ppm) 223 10 214 233 4-Acid Digestion
Na, Sodium (wt.%) 1.24 0.049 1.21 1.28 4-Acid Digestion
Nb, Niobium (ppm) 11.7 1.2 10.9 12.6 4-Acid Digestion
Nd, Neodymium (ppm) 34.0 1.74 31.7 36.4 4-Acid Digestion
Ni, Nickel (ppm) 61 3.0 58 63 4-Acid Digestion
P, Phosphorus (wt.%) 0.118 0.005 0.114 0.123 4-Acid Digestion
Pb, Lead (ppm) 141 7 135 147 4-Acid Digestion
Pr, Praseodymium (ppm) 9.92 0.316 9.29 10.55 4-Acid Digestion
Rb, Rubidium (ppm) 109 6 101 117 4-Acid Digestion
Re, Rhenium (ppm) 0.11 0.008 0.10 0.13 4-Acid Digestion
S, Sulphur (wt.%) 2.86 0.093 2.77 2.95 4-Acid Digestion
Sb, Antimony (ppm) 4.55 0.251 4.29 4.81 4-Acid Digestion
Sc, Scandium (ppm) 8.82 0.548 8.32 9.32 4-Acid Digestion
Se, Selenium (ppm) 3.45 0.57 2.56 4.35 4-Acid Digestion
Sm, Samarium (ppm) 6.02 0.335 5.42 6.62 4-Acid Digestion
Sn, Tin (ppm) 5.22 0.359 4.92 5.53 4-Acid Digestion
Sr, Strontium (ppm) 163 11 157 170 4-Acid Digestion
Ta, Tantalum (ppm) 0.81 0.09 0.73 0.89 4-Acid Digestion
Tb, Terbium (ppm) 0.73 0.064 0.67 0.80 4-Acid Digestion
Te, Tellurium (ppm) 1.17 0.090 1.07 1.27 4-Acid Digestion
Th, Thorium (ppm) 11.9 0.98 11.0 12.7 4-Acid Digestion
Ti, Titanium (wt.%) 0.320 0.022 0.304 0.335 4-Acid Digestion
Tl, Thallium (ppm) 0.68 0.034 0.64 0.72 4-Acid Digestion
Tm, Thulium (ppm) 0.27 0.009 0.25 0.29 4-Acid Digestion
U, Uranium (ppm) 18.3 0.93 17.4 19.2 4-Acid Digestion
V, Vanadium (ppm) 105 4 101 109 4-Acid Digestion
W, Tungsten (ppm) 23.7 1.44 22.4 25.1 4-Acid Digestion
Y, Yttrium (ppm) 18.7 1.37 17.7 19.7 4-Acid Digestion
Yb, Ytterbium (ppm) 1.67 0.097 1.54 1.80 4-Acid Digestion
Zn, Zinc (ppm) 529 15 516 542 4-Acid Digestion
Zr, Zirconium (ppm) 187 9 180 194 4-Acid Digestion
Ag, Silver (ppm) 2.96 0.118 2.85 3.07 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.939 0.038 0.908 0.970 Aqua Regia Digestion
As, Arsenic (ppm) 150 6 145 154 Aqua Regia Digestion
Be, Beryllium (ppm) 0.77 0.074 0.71 0.83 Aqua Regia Digestion
Bi, Bismuth (ppm) 8.30 0.313 7.95 8.65 Aqua Regia Digestion
Ca, Calcium (wt.%) 1.77 0.072 1.71 1.82 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.41 0.07 0.36 0.45 Aqua Regia Digestion
Ce, Cerium (ppm) 75 5.3 71 78 Aqua Regia Digestion
Co, Cobalt (ppm) 242 9 234 251 Aqua Regia Digestion
Cr, Chromium (ppm) 24.2 2.03 22.7 25.6 Aqua Regia Digestion
Cs, Caesium (ppm) 0.61 0.061 0.57 0.66 Aqua Regia Digestion
Cu, Copper (wt.%) 1.67 0.027 1.64 1.69 Aqua Regia Digestion
Fe, Iron (wt.%) 15.56 0.891 14.94 16.18 Aqua Regia Digestion
Ga, Gallium (ppm) 7.52 0.605 7.06 7.97 Aqua Regia Digestion
Ge, Germanium (ppm) 0.24 0.03 0.22 0.27 Aqua Regia Digestion
Hf, Hafnium (ppm) 1.22 0.071 1.15 1.29 Aqua Regia Digestion
Hg, Mercury (ppm) 0.078 0.019 0.056 0.100 Aqua Regia Digestion
In, Indium (ppm) 0.34 0.014 0.32 0.36 Aqua Regia Digestion
K, Potassium (wt.%) 0.368 0.022 0.352 0.383 Aqua Regia Digestion
La, Lanthanum (ppm) 64 7 60 68 Aqua Regia Digestion
Li, Lithium (ppm) 7.76 0.365 7.46 8.05 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.16 0.015 0.14 0.18 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.534 0.039 0.513 0.555 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.164 0.011 0.158 0.170 Aqua Regia Digestion
Mo, Molybdenum (ppm) 217 11 208 226 Aqua Regia Digestion
Na, Sodium (wt.%) 0.084 0.008 0.078 0.090 Aqua Regia Digestion
Nb, Niobium (ppm) 0.69 0.11 0.59 0.79 Aqua Regia Digestion
Ni, Nickel (ppm) 56 3.0 54 58 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.108 0.005 0.103 0.112 Aqua Regia Digestion
Pb, Lead (ppm) 118 9 112 123 Aqua Regia Digestion
Rb, Rubidium (ppm) 20.1 1.29 19.0 21.2 Aqua Regia Digestion
Re, Rhenium (ppm) 0.11 0.005 0.11 0.12 Aqua Regia Digestion
S, Sulphur (wt.%) 2.82 0.118 2.75 2.89 Aqua Regia Digestion
Sb, Antimony (ppm) 2.96 0.45 2.72 3.20 Aqua Regia Digestion
Sc, Scandium (ppm) 5.21 0.406 4.96 5.46 Aqua Regia Digestion
Se, Selenium (ppm) 2.88 0.224 2.54 3.21 Aqua Regia Digestion
Sn, Tin (ppm) 3.19 0.222 2.96 3.41 Aqua Regia Digestion
Sr, Strontium (ppm) 37.9 4.8 35.2 40.6 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.050 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.48 0.024 0.45 0.52 Aqua Regia Digestion
Te, Tellurium (ppm) 0.97 0.18 0.85 1.09 Aqua Regia Digestion
Th, Thorium (ppm) 8.41 0.672 7.90 8.93 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.089 0.008 0.083 0.094 Aqua Regia Digestion
Tl, Thallium (ppm) 0.21 0.015 0.20 0.23 Aqua Regia Digestion
U, Uranium (ppm) 15.0 0.87 14.2 15.8 Aqua Regia Digestion
V, Vanadium (ppm) 97 5.9 93 100 Aqua Regia Digestion
W, Tungsten (ppm) 16.3 1.00 15.3 17.2 Aqua Regia Digestion
Y, Yttrium (ppm) 11.9 0.57 11.4 12.4 Aqua Regia Digestion
Yb, Ytterbium (ppm) 1.02 0.079 0.93 1.11 Aqua Regia Digestion
Zn, Zinc (ppm) 489 23 473 506 Aqua Regia Digestion
Zr, Zirconium (ppm) 47.8 2.29 45.7 49.9 Aqua Regia Digestion
Al, Aluminium (wt.%) 5.43 0.079 5.29 5.56 Peroxide Fusion ICP
As, Arsenic (ppm) 149 20 132 165 Peroxide Fusion ICP
Ba, Barium (ppm) 5816 156 5654 5978 Peroxide Fusion ICP
Be, Beryllium (ppm) < 5.00 IND IND IND Peroxide Fusion ICP
Bi, Bismuth (ppm) 9.03 0.312 8.32 9.74 Peroxide Fusion ICP
Ca, Calcium (wt.%) 2.06 0.090 1.96 2.15 Peroxide Fusion ICP
Ce, Cerium (ppm) 113 3 107 119 Peroxide Fusion ICP
Co, Cobalt (ppm) 249 10 237 260 Peroxide Fusion ICP
Cr, Chromium (ppm) 56 11 45 67 Peroxide Fusion ICP
Cs, Caesium (ppm) 2.56 0.159 2.33 2.80 Peroxide Fusion ICP
Cu, Copper (wt.%) 1.68 0.036 1.63 1.72 Peroxide Fusion ICP
Dy, Dysprosium (ppm) 4.09 0.336 3.64 4.54 Peroxide Fusion ICP
Er, Erbium (ppm) 1.99 0.157 1.83 2.16 Peroxide Fusion ICP
Fe, Iron (wt.%) 18.33 0.377 17.94 18.71 Peroxide Fusion ICP
Ga, Gallium (ppm) 17.4 0.91 16.0 18.8 Peroxide Fusion ICP
Gd, Gadolinium (ppm) 5.17 0.502 4.67 5.67 Peroxide Fusion ICP
Ge, Germanium (ppm) 2.23 0.39 1.50 2.96 Peroxide Fusion ICP
Ho, Holmium (ppm) 0.80 0.029 0.75 0.85 Peroxide Fusion ICP
In, Indium (ppm) 0.39 0.033 0.31 0.47 Peroxide Fusion ICP
K, Potassium (wt.%) 3.11 0.094 3.00 3.21 Peroxide Fusion ICP
La, Lanthanum (ppm) 87 5.1 82 92 Peroxide Fusion ICP
Li, Lithium (ppm) 17.4 1.8 14.9 19.8 Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.30 0.014 0.26 0.33 Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.638 0.022 0.619 0.657 Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.183 0.005 0.177 0.189 Peroxide Fusion ICP
Mo, Molybdenum (ppm) 228 22 210 246 Peroxide Fusion ICP
Nb, Niobium (ppm) 13.9 1.12 12.4 15.4 Peroxide Fusion ICP
Nd, Neodymium (ppm) 36.0 1.88 33.1 38.9 Peroxide Fusion ICP
Ni, Nickel (ppm) 63 4.7 57 69 Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.116 0.017 0.100 0.133 Peroxide Fusion ICP
Pb, Lead (ppm) 141 10 132 150 Peroxide Fusion ICP
Pr, Praseodymium (ppm) 9.96 0.791 8.95 10.96 Peroxide Fusion ICP
Rb, Rubidium (ppm) 111 5 105 117 Peroxide Fusion ICP
S, Sulphur (wt.%) 2.99 0.134 2.89 3.10 Peroxide Fusion ICP
Sb, Antimony (ppm) 5.09 0.56 4.26 5.93 Peroxide Fusion ICP
Si, Silicon (wt.%) 21.48 0.686 20.98 21.98 Peroxide Fusion ICP
Sm, Samarium (ppm) 6.29 0.582 5.59 7.00 Peroxide Fusion ICP
Sr, Strontium (ppm) 175 11 163 186 Peroxide Fusion ICP
Ta, Tantalum (ppm) 1.11 0.14 0.89 1.32 Peroxide Fusion ICP
Tb, Terbium (ppm) 0.74 0.052 0.64 0.84 Peroxide Fusion ICP
Th, Thorium (ppm) 13.4 1.4 12.1 14.6 Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.370 0.013 0.359 0.382 Peroxide Fusion ICP
Tl, Thallium (ppm) 0.69 0.067 0.58 0.81 Peroxide Fusion ICP
Tm, Thulium (ppm) 0.29 0.04 0.25 0.33 Peroxide Fusion ICP
U, Uranium (ppm) 18.6 1.11 17.5 19.7 Peroxide Fusion ICP
V, Vanadium (ppm) 110 11 102 119 Peroxide Fusion ICP
W, Tungsten (ppm) 24.2 1.97 21.7 26.6 Peroxide Fusion ICP
Y, Yttrium (ppm) 20.9 1.15 19.6 22.3 Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.82 0.20 1.59 2.04 Peroxide Fusion ICP
Zn, Zinc (ppm) 540 40 510 570 Peroxide Fusion ICP
Ag, Silver (ppm) 2.98 0.46 2.44 3.52 3-Acid Digestion (no HF)
As, Arsenic (ppm) 153 5 146 161 3-Acid Digestion (no HF)
Co, Cobalt (ppm) 241 11 230 253 3-Acid Digestion (no HF)
Cu, Copper (wt.%) 1.66 0.027 1.59 1.72 3-Acid Digestion (no HF)
Fe, Iron (wt.%) 16.15 1.116 15.10 17.19 3-Acid Digestion (no HF)
Mo, Molybdenum (ppm) 217 8 206 228 3-Acid Digestion (no HF)
S, Sulphur (wt.%) 2.92 0.057 2.80 3.04 3-Acid Digestion (no HF)
S, Sulphur (wt.%) 2.98 0.062 2.91 3.06 Infrared Combustion
F, Fluorine (ppm) 805 122 719 892 Ion Selective Electrode
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