OREAS 525

OREAS 525 was prepared from a blend of iron oxide copper-gold (IOCG) ore, barren waste rock and barren rhyodacite. The IOCG ore and waste rock were 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.%) 1.35 0.027 1.32 1.37 4-Acid Digestion
Au, Gold (ppm) 0.818 0.017 0.811 0.825 Pb Fire Assay
Co, Cobalt (ppm) 379 15 369 389 4-Acid Digestion
Au, Gold (ppm) 0.792 0.045 0.768 0.815 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 2.09 0.087 1.99 2.18 4-Acid Digestion
Al, Aluminium (wt.%) 5.25 0.159 5.13 5.37 4-Acid Digestion
As, Arsenic (ppm) 331 13 322 341 4-Acid Digestion
Be, Beryllium (ppm) 1.66 0.122 1.55 1.78 4-Acid Digestion
Bi, Bismuth (ppm) 8.45 0.426 8.12 8.77 4-Acid Digestion
Ca, Calcium (wt.%) 2.41 0.093 2.35 2.47 4-Acid Digestion
Cd, Cadmium (ppm) 0.21 0.05 0.16 0.25 4-Acid Digestion
Ce, Cerium (ppm) 154 15 145 164 4-Acid Digestion
Cr, Chromium (ppm) 22.4 1.66 20.8 23.9 4-Acid Digestion
Cs, Caesium (ppm) 2.39 0.122 2.29 2.49 4-Acid Digestion
Dy, Dysprosium (ppm) 4.03 0.264 3.76 4.31 4-Acid Digestion
Er, Erbium (ppm) 1.97 0.114 1.84 2.09 4-Acid Digestion
Eu, Europium (ppm) 2.16 0.26 1.90 2.42 4-Acid Digestion
Fe, Iron (wt.%) 16.77 0.636 16.31 17.23 4-Acid Digestion
Ga, Gallium (ppm) 18.1 0.82 17.3 18.8 4-Acid Digestion
Gd, Gadolinium (ppm) 5.85 0.309 5.49 6.21 4-Acid Digestion
Ge, Germanium (ppm) 0.25 0.04 0.21 0.30 4-Acid Digestion
Hf, Hafnium (ppm) 4.87 0.200 4.65 5.10 4-Acid Digestion
Ho, Holmium (ppm) 0.75 0.034 0.70 0.80 4-Acid Digestion
In, Indium (ppm) 0.31 0.018 0.29 0.33 4-Acid Digestion
K, Potassium (wt.%) 3.28 0.114 3.20 3.37 4-Acid Digestion
La, Lanthanum (ppm) 144 17 134 154 4-Acid Digestion
Li, Lithium (ppm) 16.2 0.80 15.6 16.8 4-Acid Digestion
Lu, Lutetium (ppm) 0.29 0.023 0.26 0.31 4-Acid Digestion
Mg, Magnesium (wt.%) 0.773 0.032 0.753 0.793 4-Acid Digestion
Mn, Manganese (wt.%) 0.323 0.011 0.314 0.331 4-Acid Digestion
Mo, Molybdenum (ppm) 190 8 185 196 4-Acid Digestion
Na, Sodium (wt.%) 1.15 0.032 1.12 1.17 4-Acid Digestion
Nb, Niobium (ppm) 12.1 1.4 11.1 13.1 4-Acid Digestion
Nd, Neodymium (ppm) 42.7 2.32 40.0 45.5 4-Acid Digestion
Ni, Nickel (ppm) 54 3.2 53 56 4-Acid Digestion
P, Phosphorus (wt.%) 0.105 0.003 0.103 0.108 4-Acid Digestion
Pb, Lead (ppm) 18.4 2.8 16.7 20.0 4-Acid Digestion
Pr, Praseodymium (ppm) 13.1 0.79 12.2 14.1 4-Acid Digestion
Rb, Rubidium (ppm) 115 5 110 119 4-Acid Digestion
Re, Rhenium (ppm) 0.11 0.008 0.10 0.12 4-Acid Digestion
S, Sulphur (wt.%) 2.39 0.077 2.31 2.46 4-Acid Digestion
Sb, Antimony (ppm) 5.59 0.234 5.37 5.81 4-Acid Digestion
Sc, Scandium (ppm) 8.45 0.569 8.09 8.82 4-Acid Digestion
Se, Selenium (ppm) 3.06 0.54 2.32 3.81 4-Acid Digestion
Sm, Samarium (ppm) 6.82 0.412 6.36 7.28 4-Acid Digestion
Sn, Tin (ppm) 6.97 0.458 6.62 7.31 4-Acid Digestion
Sr, Strontium (ppm) 222 20 210 234 4-Acid Digestion
Ta, Tantalum (ppm) 0.81 0.064 0.74 0.88 4-Acid Digestion
Tb, Terbium (ppm) 0.79 0.075 0.72 0.85 4-Acid Digestion
Te, Tellurium (ppm) 1.06 0.103 0.98 1.14 4-Acid Digestion
Th, Thorium (ppm) 12.2 1.2 11.3 13.2 4-Acid Digestion
Ti, Titanium (wt.%) 0.319 0.017 0.307 0.331 4-Acid Digestion
Tl, Thallium (ppm) 0.42 0.024 0.40 0.44 4-Acid Digestion
Tm, Thulium (ppm) 0.27 0.018 0.24 0.30 4-Acid Digestion
U, Uranium (ppm) 30.8 1.76 29.4 32.2 4-Acid Digestion
V, Vanadium (ppm) 107 3 104 110 4-Acid Digestion
W, Tungsten (ppm) 85 3.8 81 89 4-Acid Digestion
Y, Yttrium (ppm) 19.5 1.04 18.8 20.3 4-Acid Digestion
Yb, Ytterbium (ppm) 1.71 0.099 1.59 1.83 4-Acid Digestion
Zn, Zinc (ppm) 68 3.2 66 71 4-Acid Digestion
Zr, Zirconium (ppm) 182 8 177 188 4-Acid Digestion
Ag, Silver (ppm) 1.97 0.093 1.90 2.04 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.10 0.054 1.06 1.14 Aqua Regia Digestion
As, Arsenic (ppm) 321 12 312 330 Aqua Regia Digestion
Be, Beryllium (ppm) 0.69 0.064 0.65 0.74 Aqua Regia Digestion
Bi, Bismuth (ppm) 8.44 0.448 8.05 8.84 Aqua Regia Digestion
Ca, Calcium (wt.%) 2.15 0.083 2.10 2.20 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.18 0.03 0.15 0.22 Aqua Regia Digestion
Ce, Cerium (ppm) 133 10 126 140 Aqua Regia Digestion
Co, Cobalt (ppm) 378 13 367 389 Aqua Regia Digestion
Cr, Chromium (ppm) 18.7 1.51 17.6 19.7 Aqua Regia Digestion
Cs, Caesium (ppm) 0.78 0.073 0.73 0.84 Aqua Regia Digestion
Cu, Copper (wt.%) 1.35 0.025 1.32 1.38 Aqua Regia Digestion
Fe, Iron (wt.%) 16.07 0.446 15.69 16.45 Aqua Regia Digestion
Ga, Gallium (ppm) 9.03 0.765 8.43 9.63 Aqua Regia Digestion
Ge, Germanium (ppm) 0.20 0.03 0.16 0.24 Aqua Regia Digestion
Hf, Hafnium (ppm) 1.73 0.127 1.64 1.83 Aqua Regia Digestion
In, Indium (ppm) 0.28 0.015 0.26 0.30 Aqua Regia Digestion
K, Potassium (wt.%) 0.536 0.028 0.517 0.555 Aqua Regia Digestion
La, Lanthanum (ppm) 131 16 121 141 Aqua Regia Digestion
Li, Lithium (ppm) 11.2 0.48 10.7 11.6 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.19 0.008 0.17 0.20 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.703 0.042 0.682 0.724 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.303 0.017 0.294 0.312 Aqua Regia Digestion
Mo, Molybdenum (ppm) 186 9 179 192 Aqua Regia Digestion
Na, Sodium (wt.%) 0.090 0.007 0.085 0.094 Aqua Regia Digestion
Nb, Niobium (ppm) 1.12 0.19 0.97 1.27 Aqua Regia Digestion
Ni, Nickel (ppm) 52 3.0 50 54 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.098 0.005 0.095 0.101 Aqua Regia Digestion
Pb, Lead (ppm) 14.4 1.7 13.1 15.6 Aqua Regia Digestion
Rb, Rubidium (ppm) 30.3 2.20 28.9 31.8 Aqua Regia Digestion
Re, Rhenium (ppm) 0.11 0.004 0.10 0.11 Aqua Regia Digestion
S, Sulphur (wt.%) 2.42 0.095 2.36 2.48 Aqua Regia Digestion
Sb, Antimony (ppm) 3.57 0.64 3.21 3.93 Aqua Regia Digestion
Sc, Scandium (ppm) 5.82 0.455 5.51 6.13 Aqua Regia Digestion
Se, Selenium (ppm) 2.93 0.198 2.67 3.19 Aqua Regia Digestion
Sn, Tin (ppm) 5.03 0.247 4.81 5.26 Aqua Regia Digestion
Sr, Strontium (ppm) 68 12 62 74 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.050 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.58 0.035 0.53 0.62 Aqua Regia Digestion
Te, Tellurium (ppm) 1.01 0.10 0.90 1.11 Aqua Regia Digestion
Th, Thorium (ppm) 8.99 0.94 8.34 9.64 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.118 0.015 0.110 0.127 Aqua Regia Digestion
Tl, Thallium (ppm) 0.13 0.011 0.12 0.15 Aqua Regia Digestion
U, Uranium (ppm) 27.3 1.11 25.9 28.6 Aqua Regia Digestion
V, Vanadium (ppm) 97 6.0 94 100 Aqua Regia Digestion
W, Tungsten (ppm) 67 5.0 63 71 Aqua Regia Digestion
Y, Yttrium (ppm) 13.9 0.72 13.3 14.5 Aqua Regia Digestion
Yb, Ytterbium (ppm) 1.18 0.068 1.09 1.28 Aqua Regia Digestion
Zn, Zinc (ppm) 47.7 3.24 45.5 49.8 Aqua Regia Digestion
Zr, Zirconium (ppm) 66 2.9 64 69 Aqua Regia Digestion
Al, Aluminium (wt.%) 5.38 0.121 5.25 5.50 Peroxide Fusion ICP
As, Arsenic (ppm) 329 34 299 358 Peroxide Fusion ICP
Ba, Barium (wt.%) 1.55 0.18 1.41 1.70 Peroxide Fusion ICP
Be, Beryllium (ppm) 2.16 0.23 1.78 2.54 Peroxide Fusion ICP
Bi, Bismuth (ppm) 8.67 0.457 7.87 9.46 Peroxide Fusion ICP
Ca, Calcium (wt.%) 2.45 0.086 2.35 2.54 Peroxide Fusion ICP
Ce, Cerium (ppm) 175 12 161 189 Peroxide Fusion ICP
Co, Cobalt (ppm) 385 17 370 401 Peroxide Fusion ICP
Cs, Caesium (ppm) 2.37 0.152 2.17 2.57 Peroxide Fusion ICP
Cu, Copper (wt.%) 1.35 0.024 1.32 1.38 Peroxide Fusion ICP
Dy, Dysprosium (ppm) 4.31 0.199 3.84 4.79 Peroxide Fusion ICP
Er, Erbium (ppm) 2.11 0.138 1.94 2.29 Peroxide Fusion ICP
Fe, Iron (wt.%) 17.18 0.372 16.81 17.56 Peroxide Fusion ICP
Ga, Gallium (ppm) 18.5 0.79 17.4 19.7 Peroxide Fusion ICP
Gd, Gadolinium (ppm) 5.76 0.500 5.12 6.39 Peroxide Fusion ICP
Ho, Holmium (ppm) 0.82 0.036 0.76 0.88 Peroxide Fusion ICP
In, Indium (ppm) 0.32 0.06 0.23 0.42 Peroxide Fusion ICP
K, Potassium (wt.%) 3.39 0.095 3.28 3.49 Peroxide Fusion ICP
La, Lanthanum (ppm) 176 11 167 185 Peroxide Fusion ICP
Li, Lithium (ppm) 16.6 2.6 14.0 19.3 Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.32 0.027 0.28 0.37 Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.801 0.018 0.779 0.823 Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.336 0.009 0.324 0.347 Peroxide Fusion ICP
Mo, Molybdenum (ppm) 195 18 180 209 Peroxide Fusion ICP
Nb, Niobium (ppm) 14.9 1.29 13.2 16.5 Peroxide Fusion ICP
Nd, Neodymium (ppm) 43.3 1.96 39.7 46.9 Peroxide Fusion ICP
Ni, Nickel (ppm) 58 9 52 65 Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.109 0.010 0.098 0.120 Peroxide Fusion ICP
Pr, Praseodymium (ppm) 13.6 0.43 12.9 14.4 Peroxide Fusion ICP
Rb, Rubidium (ppm) 116 6 110 122 Peroxide Fusion ICP
S, Sulphur (wt.%) 2.78 0.098 2.71 2.86 Peroxide Fusion ICP
Sb, Antimony (ppm) 5.97 0.69 5.02 6.93 Peroxide Fusion ICP
Si, Silicon (wt.%) 21.22 0.970 20.52 21.92 Peroxide Fusion ICP
Sm, Samarium (ppm) 6.64 0.307 6.11 7.18 Peroxide Fusion ICP
Sr, Strontium (ppm) 250 14 239 262 Peroxide Fusion ICP
Ta, Tantalum (ppm) 1.08 0.087 0.94 1.22 Peroxide Fusion ICP
Tb, Terbium (ppm) 0.79 0.027 0.75 0.83 Peroxide Fusion ICP
Th, Thorium (ppm) 13.4 0.39 12.8 14.0 Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.375 0.013 0.363 0.386 Peroxide Fusion ICP
Tl, Thallium (ppm) < 0.50 IND IND IND Peroxide Fusion ICP
Tm, Thulium (ppm) 0.30 0.018 0.27 0.33 Peroxide Fusion ICP
U, Uranium (ppm) 31.0 1.67 29.2 32.7 Peroxide Fusion ICP
V, Vanadium (ppm) 113 13 103 124 Peroxide Fusion ICP
W, Tungsten (ppm) 83 6.7 76 89 Peroxide Fusion ICP
Y, Yttrium (ppm) 22.4 0.91 21.4 23.5 Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.98 0.100 1.80 2.15 Peroxide Fusion ICP
Zn, Zinc (ppm) 71 9 63 80 Peroxide Fusion ICP
Ag, Silver (ppm) 2.19 0.138 1.94 2.44 3-Acid Digestion (no HF)
As, Arsenic (ppm) 324 14 311 336 3-Acid Digestion (no HF)
Co, Cobalt (ppm) 370 18 353 388 3-Acid Digestion (no HF)
Cu, Copper (wt.%) 1.33 0.020 1.29 1.37 3-Acid Digestion (no HF)
Fe, Iron (wt.%) 16.65 0.667 15.97 17.34 3-Acid Digestion (no HF)
Mo, Molybdenum (ppm) 186 7 179 192 3-Acid Digestion (no HF)
S, Sulphur (wt.%) 2.48 0.057 2.39 2.58 3-Acid Digestion (no HF)
S, Sulphur (wt.%) 2.75 0.098 2.68 2.82 Infrared Combustion
F, Fluorine (ppm) 2780 245 2611 2948 Ion Selective Electrode
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