OREAS 612

OREAS 612 was prepared predominantly from a blend of silver ore materials sourced from the Bowdens Silver Project, New South Wales, Australia, together with barren rhyodacite used as a matrix component. The Bowdens material represents low-sulphidation epithermal mineralisation characterised by elevated silver with minor associated copper, gold, lead and arsenic. Minor quantities of Zn–Pb–Ag–rich sulphide ore and gold ore were also added to achieve target grades.

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

  • Gold by Pb collection fire assay (25-30 g charge weight) with AAS or ICP-OES finish
  • Gold by aqua regia digestion (10-50g sample weight) with AAS or ICP-MS finish
  • Full ICP-OES and ICP-MS elemental suites by four-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 (ppb) 62.3 6.01 59.6 64.9 Pb Fire Assay
Au, Gold (ppb) 58.3 3.37 56.1 60.6 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 48.2 1.43 46.8 49.6 4-Acid Digestion
Cu, Copper (ppm) 94 4.5 89 98 4-Acid Digestion
Al, Aluminium (wt.%) 7.22 0.248 6.96 7.48 4-Acid Digestion
As, Arsenic (ppm) 331 11 321 341 4-Acid Digestion
Ba, Barium (ppm) 2163 59 2101 2226 4-Acid Digestion
Be, Beryllium (ppm) 2.48 0.109 2.37 2.60 4-Acid Digestion
Bi, Bismuth (ppm) 0.85 0.079 0.79 0.92 4-Acid Digestion
Ca, Calcium (wt.%) 0.705 0.026 0.680 0.729 4-Acid Digestion
Cd, Cadmium (ppm) 13.8 0.38 13.3 14.4 4-Acid Digestion
Ce, Cerium (ppm) 77 4.1 73 80 4-Acid Digestion
Co, Cobalt (ppm) 4.11 0.201 3.88 4.34 4-Acid Digestion
Cr, Chromium (ppm) 21.8 2.8 19.1 24.4 4-Acid Digestion
Cs, Caesium (ppm) 6.63 0.226 6.35 6.90 4-Acid Digestion
Dy, Dysprosium (ppm) 3.41 0.097 3.23 3.58 4-Acid Digestion
Er, Erbium (ppm) 1.27 0.059 1.18 1.36 4-Acid Digestion
Eu, Europium (ppm) 1.39 0.082 1.30 1.49 4-Acid Digestion
Fe, Iron (wt.%) 2.23 0.053 2.18 2.28 4-Acid Digestion
Ga, Gallium (ppm) 20.2 0.86 19.3 21.1 4-Acid Digestion
Gd, Gadolinium (ppm) 5.45 0.261 5.12 5.78 4-Acid Digestion
Hf, Hafnium (ppm) 4.29 0.176 4.04 4.54 4-Acid Digestion
Ho, Holmium (ppm) 0.52 0.025 0.48 0.55 4-Acid Digestion
In, Indium (ppm) 0.14 0.009 0.12 0.16 4-Acid Digestion
K, Potassium (wt.%) 4.33 0.265 4.15 4.51 4-Acid Digestion
La, Lanthanum (ppm) 36.0 3.9 33.6 38.4 4-Acid Digestion
Li, Lithium (ppm) 32.3 1.41 30.6 34.0 4-Acid Digestion
Lu, Lutetium (ppm) 0.15 0.012 0.13 0.16 4-Acid Digestion
Mg, Magnesium (wt.%) 0.259 0.008 0.249 0.268 4-Acid Digestion
Mn, Manganese (wt.%) 0.045 0.002 0.043 0.046 4-Acid Digestion
Mo, Molybdenum (ppm) 7.07 0.360 6.65 7.48 4-Acid Digestion
Na, Sodium (wt.%) 1.68 0.059 1.63 1.73 4-Acid Digestion
Nb, Niobium (ppm) 14.5 0.55 14.0 15.1 4-Acid Digestion
Nd, Neodymium (ppm) 33.6 1.46 31.8 35.5 4-Acid Digestion
Ni, Nickel (ppm) 10.8 0.92 9.8 11.8 4-Acid Digestion
P, Phosphorus (wt.%) 0.047 0.002 0.045 0.049 4-Acid Digestion
Pb, Lead (wt.%) 0.253 0.009 0.246 0.261 4-Acid Digestion
Pr, Praseodymium (ppm) 8.98 0.448 8.43 9.52 4-Acid Digestion
Rb, Rubidium (ppm) 211 12 201 222 4-Acid Digestion
S, Sulphur (wt.%) 0.518 0.015 0.502 0.535 4-Acid Digestion
Sb, Antimony (ppm) 14.1 0.73 13.4 14.9 4-Acid Digestion
Sc, Scandium (ppm) 5.28 0.378 5.02 5.53 4-Acid Digestion
Sm, Samarium (ppm) 6.75 0.230 6.37 7.13 4-Acid Digestion
Sn, Tin (ppm) 3.62 0.130 3.41 3.83 4-Acid Digestion
Sr, Strontium (ppm) 228 7 220 237 4-Acid Digestion
Ta, Tantalum (ppm) 1.08 0.070 1.00 1.16 4-Acid Digestion
Tb, Terbium (ppm) 0.70 0.040 0.66 0.74 4-Acid Digestion
Te, Tellurium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 12.9 0.61 12.3 13.5 4-Acid Digestion
Ti, Titanium (wt.%) 0.201 0.007 0.192 0.209 4-Acid Digestion
Tl, Thallium (ppm) 3.77 0.159 3.60 3.94 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.006 0.15 0.18 4-Acid Digestion
U, Uranium (ppm) 4.36 0.209 4.19 4.53 4-Acid Digestion
V, Vanadium (ppm) 28.9 0.98 27.9 30.0 4-Acid Digestion
W, Tungsten (ppm) 3.07 0.234 2.81 3.33 4-Acid Digestion
Y, Yttrium (ppm) 14.3 0.76 13.6 14.9 4-Acid Digestion
Yb, Ytterbium (ppm) 1.02 0.067 0.93 1.10 4-Acid Digestion
Zn, Zinc (wt.%) 0.367 0.010 0.357 0.376 4-Acid Digestion
Zr, Zirconium (ppm) 149 6 144 155 4-Acid Digestion
Ag, Silver (ppm) 47.2 1.69 45.8 48.7 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.874 0.041 0.836 0.911 Aqua Regia Digestion
As, Arsenic (ppm) 322 10 311 332 Aqua Regia Digestion
Ba, Barium (ppm) 324 28 304 344 Aqua Regia Digestion
Be, Beryllium (ppm) 0.63 0.024 0.60 0.66 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.85 0.044 0.78 0.91 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.501 0.015 0.487 0.516 Aqua Regia Digestion
Cd, Cadmium (ppm) 13.9 0.35 13.4 14.4 Aqua Regia Digestion
Ce, Cerium (ppm) 48.6 3.09 45.8 51.4 Aqua Regia Digestion
Co, Cobalt (ppm) 3.69 0.155 3.53 3.85 Aqua Regia Digestion
Cr, Chromium (ppm) 19.5 1.32 17.6 21.4 Aqua Regia Digestion
Cs, Caesium (ppm) 2.25 0.095 2.14 2.36 Aqua Regia Digestion
Cu, Copper (ppm) 92 3.4 89 95 Aqua Regia Digestion
Dy, Dysprosium (ppm) 1.91 0.19 1.71 2.12 Aqua Regia Digestion
Er, Erbium (ppm) 0.59 0.056 0.53 0.66 Aqua Regia Digestion
Eu, Europium (ppm) 0.84 0.11 0.71 0.97 Aqua Regia Digestion
Fe, Iron (wt.%) 1.84 0.064 1.78 1.89 Aqua Regia Digestion
Ga, Gallium (ppm) 4.33 0.337 4.02 4.65 Aqua Regia Digestion
Gd, Gadolinium (ppm) 3.50 0.336 3.08 3.92 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.82 0.050 0.75 0.88 Aqua Regia Digestion
Hg, Mercury (ppm) 0.19 0.013 0.17 0.21 Aqua Regia Digestion
Ho, Holmium (ppm) 0.27 0.03 0.23 0.31 Aqua Regia Digestion
In, Indium (ppm) 0.064 0.008 0.055 0.074 Aqua Regia Digestion
K, Potassium (wt.%) 0.436 0.022 0.414 0.457 Aqua Regia Digestion
La, Lanthanum (ppm) 23.6 1.65 22.2 24.9 Aqua Regia Digestion
Li, Lithium (ppm) 10.4 0.75 9.8 11.0 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.057 0.007 0.052 0.063 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.165 0.009 0.156 0.174 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.041 0.001 0.040 0.042 Aqua Regia Digestion
Mo, Molybdenum (ppm) 6.49 0.283 6.18 6.79 Aqua Regia Digestion
Na, Sodium (wt.%) 0.060 0.005 0.052 0.068 Aqua Regia Digestion
Nd, Neodymium (ppm) 22.5 2.14 19.8 25.3 Aqua Regia Digestion
Ni, Nickel (ppm) 10.3 0.75 9.4 11.2 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.037 0.002 0.035 0.038 Aqua Regia Digestion
Pb, Lead (wt.%) 0.248 0.007 0.241 0.255 Aqua Regia Digestion
Pr, Praseodymium (ppm) 5.78 0.541 5.10 6.46 Aqua Regia Digestion
Rb, Rubidium (ppm) 23.5 1.09 22.3 24.8 Aqua Regia Digestion
S, Sulphur (wt.%) 0.515 0.013 0.499 0.530 Aqua Regia Digestion
Sb, Antimony (ppm) 10.5 1.2 9.7 11.3 Aqua Regia Digestion
Sc, Scandium (ppm) 1.61 0.22 1.44 1.77 Aqua Regia Digestion
Sm, Samarium (ppm) 4.28 0.351 3.84 4.71 Aqua Regia Digestion
Sn, Tin (ppm) 0.98 0.16 0.85 1.10 Aqua Regia Digestion
Sr, Strontium (ppm) 49.2 6.9 45.3 53.2 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.41 0.023 0.38 0.44 Aqua Regia Digestion
Te, Tellurium (ppm) < 0.050 IND IND IND Aqua Regia Digestion
Th, Thorium (ppm) 7.79 0.80 7.13 8.44 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.016 0.002 0.014 0.018 Aqua Regia Digestion
Tl, Thallium (ppm) 0.86 0.060 0.81 0.91 Aqua Regia Digestion
Tm, Thulium (ppm) 0.073 0.009 0.060 0.086 Aqua Regia Digestion
U, Uranium (ppm) 2.22 0.132 2.08 2.35 Aqua Regia Digestion
V, Vanadium (ppm) 9.41 1.35 8.30 10.52 Aqua Regia Digestion
W, Tungsten (ppm) 1.03 0.26 0.83 1.23 Aqua Regia Digestion
Y, Yttrium (ppm) 7.22 0.543 6.80 7.64 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.40 0.028 0.37 0.44 Aqua Regia Digestion
Zn, Zinc (wt.%) 0.362 0.006 0.354 0.371 Aqua Regia Digestion
Zr, Zirconium (ppm) 28.0 1.79 26.2 29.8 Aqua Regia Digestion
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