OREAS 613

OREAS 613 was prepared predominantly from a blend of silver ore materials sourced from the Bowdens Silver deposit, New South Wales, Australia, together with barren rhyodacite used as a matrix component. Bowdens silver ore is a low-sulphidation epithermal mineralisation type, containing minor amounts gold, lead, zinc, arsenic and copper. Ag, Cu Au, Zn & Pb sulphide ores were also added to achieve the target grades and high sulphidation matrix characteristics.

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
  • Silver by Pb collection fire assay (10-30 g charge weight) with gravimetric 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
  • Total Sulphur by IR induction or combustion furnace

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) 5.21 0.172 5.13 5.29 Pb Fire Assay
Ag, Silver (ppm) 299 13 286 311 Pb Fire Assay (Grav)
Au, Gold (ppm) 5.11 0.204 4.99 5.24 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 312 6 305 320 4-Acid Digestion
Cu, Copper (wt.%) 1.03 0.019 1.01 1.05 4-Acid Digestion
Al, Aluminium (wt.%) 6.90 0.231 6.60 7.19 4-Acid Digestion
As, Arsenic (ppm) 1157 29 1124 1189 4-Acid Digestion
Be, Beryllium (ppm) 2.34 0.097 2.24 2.44 4-Acid Digestion
Bi, Bismuth (ppm) 64 3.2 61 66 4-Acid Digestion
Ca, Calcium (wt.%) 0.904 0.035 0.876 0.932 4-Acid Digestion
Cd, Cadmium (ppm) 12.0 0.36 11.6 12.5 4-Acid Digestion
Ce, Cerium (ppm) 74 3.5 71 78 4-Acid Digestion
Co, Cobalt (ppm) 18.5 0.86 17.9 19.1 4-Acid Digestion
Cr, Chromium (ppm) 18.2 1.81 16.7 19.6 4-Acid Digestion
Cs, Caesium (ppm) 5.22 0.184 5.03 5.41 4-Acid Digestion
Dy, Dysprosium (ppm) 3.56 0.149 3.35 3.78 4-Acid Digestion
Er, Erbium (ppm) 1.33 0.063 1.25 1.40 4-Acid Digestion
Eu, Europium (ppm) 1.20 0.070 1.11 1.30 4-Acid Digestion
Fe, Iron (wt.%) 4.17 0.112 4.05 4.29 4-Acid Digestion
Ga, Gallium (ppm) 20.4 0.69 19.7 21.1 4-Acid Digestion
Gd, Gadolinium (ppm) 5.37 0.444 4.86 5.87 4-Acid Digestion
Hf, Hafnium (ppm) 5.44 0.188 5.18 5.71 4-Acid Digestion
Ho, Holmium (ppm) 0.53 0.022 0.49 0.58 4-Acid Digestion
In, Indium (ppm) 2.19 0.080 2.08 2.30 4-Acid Digestion
K, Potassium (wt.%) 4.01 0.148 3.91 4.12 4-Acid Digestion
La, Lanthanum (ppm) 35.8 1.68 34.2 37.5 4-Acid Digestion
Li, Lithium (ppm) 24.4 1.73 22.9 25.9 4-Acid Digestion
Lu, Lutetium (ppm) 0.14 0.01 0.12 0.16 4-Acid Digestion
Mg, Magnesium (wt.%) 0.165 0.007 0.158 0.172 4-Acid Digestion
Mn, Manganese (wt.%) 0.035 0.001 0.034 0.036 4-Acid Digestion
Mo, Molybdenum (ppm) 11.9 0.38 11.5 12.3 4-Acid Digestion
Na, Sodium (wt.%) 1.83 0.055 1.77 1.89 4-Acid Digestion
Nb, Niobium (ppm) 14.7 0.55 14.2 15.1 4-Acid Digestion
Nd, Neodymium (ppm) 33.0 1.32 31.2 34.7 4-Acid Digestion
Ni, Nickel (ppm) 5.96 0.417 5.49 6.44 4-Acid Digestion
P, Phosphorus (wt.%) 0.032 0.001 0.030 0.033 4-Acid Digestion
Pb, Lead (wt.%) 0.146 0.004 0.141 0.150 4-Acid Digestion
Pr, Praseodymium (ppm) 8.67 0.424 8.18 9.17 4-Acid Digestion
Rb, Rubidium (ppm) 187 8 179 195 4-Acid Digestion
S, Sulphur (wt.%) 2.59 0.051 2.53 2.66 4-Acid Digestion
Sb, Antimony (ppm) 104 4 100 108 4-Acid Digestion
Sc, Scandium (ppm) 5.37 0.321 5.09 5.64 4-Acid Digestion
Se, Selenium (ppm) 19.1 1.09 17.9 20.3 4-Acid Digestion
Sm, Samarium (ppm) 6.59 0.496 6.08 7.09 4-Acid Digestion
Sn, Tin (ppm) 8.30 0.421 7.92 8.67 4-Acid Digestion
Sr, Strontium (ppm) 219 9 210 228 4-Acid Digestion
Ta, Tantalum (ppm) 1.06 0.067 0.97 1.15 4-Acid Digestion
Tb, Terbium (ppm) 0.68 0.019 0.65 0.72 4-Acid Digestion
Te, Tellurium (ppm) 15.6 0.84 14.8 16.3 4-Acid Digestion
Th, Thorium (ppm) 11.6 0.54 11.0 12.2 4-Acid Digestion
Ti, Titanium (wt.%) 0.163 0.006 0.157 0.169 4-Acid Digestion
Tl, Thallium (ppm) 3.54 0.123 3.40 3.69 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.015 0.15 0.19 4-Acid Digestion
U, Uranium (ppm) 4.09 0.214 3.87 4.31 4-Acid Digestion
V, Vanadium (ppm) 19.6 0.65 18.8 20.5 4-Acid Digestion
W, Tungsten (ppm) 3.92 0.203 3.68 4.16 4-Acid Digestion
Y, Yttrium (ppm) 15.5 0.70 15.0 16.1 4-Acid Digestion
Yb, Ytterbium (ppm) 1.00 0.081 0.91 1.10 4-Acid Digestion
Zn, Zinc (wt.%) 0.245 0.007 0.239 0.252 4-Acid Digestion
Zr, Zirconium (ppm) 204 4 198 211 4-Acid Digestion
Ag, Silver (ppm) 307 8 298 317 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.800 0.067 0.753 0.846 Aqua Regia Digestion
As, Arsenic (ppm) 1115 44 1083 1147 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Be, Beryllium (ppm) 0.47 0.06 0.42 0.52 Aqua Regia Digestion
Bi, Bismuth (ppm) 65 1.7 63 66 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.544 0.022 0.527 0.561 Aqua Regia Digestion
Cd, Cadmium (ppm) 12.1 0.39 11.6 12.5 Aqua Regia Digestion
Ce, Cerium (ppm) 41.5 3.05 38.7 44.2 Aqua Regia Digestion
Co, Cobalt (ppm) 17.6 0.90 16.8 18.3 Aqua Regia Digestion
Cr, Chromium (ppm) 18.3 1.43 17.2 19.4 Aqua Regia Digestion
Cs, Caesium (ppm) 1.48 0.16 1.37 1.59 Aqua Regia Digestion
Cu, Copper (wt.%) 1.04 0.018 1.02 1.07 Aqua Regia Digestion
Dy, Dysprosium (ppm) 2.10 0.26 1.84 2.36 Aqua Regia Digestion
Er, Erbium (ppm) 0.69 0.061 0.61 0.76 Aqua Regia Digestion
Eu, Europium (ppm) 0.73 0.10 0.62 0.85 Aqua Regia Digestion
Fe, Iron (wt.%) 3.77 0.154 3.67 3.87 Aqua Regia Digestion
Ga, Gallium (ppm) 4.78 0.340 4.44 5.12 Aqua Regia Digestion
Gd, Gadolinium (ppm) 3.37 0.323 3.01 3.72 Aqua Regia Digestion
Hf, Hafnium (ppm) 1.52 0.16 1.39 1.65 Aqua Regia Digestion
Hg, Mercury (ppm) 0.50 0.030 0.44 0.56 Aqua Regia Digestion
Ho, Holmium (ppm) 0.30 0.03 0.26 0.33 Aqua Regia Digestion
In, Indium (ppm) 2.11 0.074 1.99 2.23 Aqua Regia Digestion
K, Potassium (wt.%) 0.448 0.032 0.425 0.472 Aqua Regia Digestion
La, Lanthanum (ppm) 20.0 1.61 18.7 21.3 Aqua Regia Digestion
Li, Lithium (ppm) 5.07 0.66 4.58 5.55 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.066 0.009 0.056 0.076 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.081 0.010 0.073 0.089 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.028 0.001 0.027 0.029 Aqua Regia Digestion
Mo, Molybdenum (ppm) 11.1 0.43 10.7 11.5 Aqua Regia Digestion
Na, Sodium (wt.%) 0.081 0.008 0.073 0.089 Aqua Regia Digestion
Nb, Niobium (ppm) 1.60 0.30 1.36 1.84 Aqua Regia Digestion
Nd, Neodymium (ppm) 21.3 3.3 18.0 24.6 Aqua Regia Digestion
Ni, Nickel (ppm) 5.71 0.434 5.29 6.12 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.023 0.002 0.022 0.024 Aqua Regia Digestion
Pb, Lead (wt.%) 0.139 0.005 0.135 0.144 Aqua Regia Digestion
Pr, Praseodymium (ppm) 5.51 0.91 4.59 6.42 Aqua Regia Digestion
Rb, Rubidium (ppm) 23.1 1.17 21.9 24.4 Aqua Regia Digestion
Re, Rhenium (ppm) 0.006 0.001 0.005 0.007 Aqua Regia Digestion
S, Sulphur (wt.%) 2.55 0.061 2.49 2.62 Aqua Regia Digestion
Sb, Antimony (ppm) 79 9 73 84 Aqua Regia Digestion
Sc, Scandium (ppm) 2.31 0.26 2.11 2.50 Aqua Regia Digestion
Se, Selenium (ppm) 19.4 0.82 18.3 20.5 Aqua Regia Digestion
Sm, Samarium (ppm) 3.80 0.368 3.36 4.25 Aqua Regia Digestion
Sn, Tin (ppm) 6.48 0.300 6.17 6.80 Aqua Regia Digestion
Sr, Strontium (ppm) 41.7 3.01 39.0 44.4 Aqua Regia Digestion
Tb, Terbium (ppm) 0.41 0.032 0.37 0.44 Aqua Regia Digestion
Te, Tellurium (ppm) 15.4 0.69 14.7 16.1 Aqua Regia Digestion
Th, Thorium (ppm) 7.01 0.501 6.54 7.48 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.038 0.007 0.034 0.042 Aqua Regia Digestion
Tl, Thallium (ppm) 1.18 0.048 1.12 1.24 Aqua Regia Digestion
Tm, Thulium (ppm) 0.084 0.011 0.067 0.101 Aqua Regia Digestion
U, Uranium (ppm) 2.04 0.136 1.91 2.17 Aqua Regia Digestion
V, Vanadium (ppm) 7.51 0.86 6.74 8.29 Aqua Regia Digestion
W, Tungsten (ppm) 1.94 0.28 1.72 2.16 Aqua Regia Digestion
Y, Yttrium (ppm) 8.06 0.729 7.56 8.56 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.50 0.049 0.44 0.55 Aqua Regia Digestion
Zn, Zinc (wt.%) 0.240 0.006 0.234 0.245 Aqua Regia Digestion
Zr, Zirconium (ppm) 57 4.3 54 61 Aqua Regia Digestion
S, Sulphur (wt.%) 2.57 0.059 2.52 2.63 Infrared Combustion
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