Specifications
-
CRM State:
-
Matrix:
-
Mineralisation:
OREAS 247b was prepared from a blend of high-grade gold ores and barren metasediments sourced from Australia. The majority of the ore was sourced from the central Victorian goldfields, where gold is hosted in a metamorphosed turbidite sequence of interbedded sandstones, siltstones, and shales. Gold mineralisation is predominantly associated with disseminated arsenopyrite and pyrite, with minor stibnite–quartz zones. Material from the Agate Creek Gold Project in the Etheridge Goldfield of northern Queensland was also included to achieve the target gold grade.
Thirty-seven commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:
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) | 42.18 | 1.243 | 41.68 | 42.69 | Pb Fire Assay |
Au, Gold (ppm) | 43.65 | 0.977 | 43.17 | 44.14 | PhotonAssay |
Ag, Silver (ppm) | 15.0 | 0.61 | 14.4 | 15.7 | 4-Acid Digestion |
Al, Aluminium (wt.%) | 4.67 | 0.156 | 4.53 | 4.81 | 4-Acid Digestion |
As, Arsenic (wt.%) | 0.385 | 0.015 | 0.372 | 0.398 | 4-Acid Digestion |
Ba, Barium (ppm) | 368 | 11 | 358 | 379 | 4-Acid Digestion |
Be, Beryllium (ppm) | 1.94 | 0.068 | 1.85 | 2.03 | 4-Acid Digestion |
Bi, Bismuth (ppm) | 0.66 | 0.042 | 0.61 | 0.70 | 4-Acid Digestion |
Ca, Calcium (wt.%) | 0.682 | 0.020 | 0.658 | 0.706 | 4-Acid Digestion |
Cd, Cadmium (ppm) | 0.099 | 0.018 | 0.076 | 0.121 | 4-Acid Digestion |
Ce, Cerium (ppm) | 59 | 2.4 | 57 | 62 | 4-Acid Digestion |
Co, Cobalt (ppm) | 10.3 | 0.38 | 9.9 | 10.7 | 4-Acid Digestion |
Cr, Chromium (ppm) | 77 | 6.3 | 72 | 81 | 4-Acid Digestion |
Cs, Caesium (ppm) | 7.35 | 0.289 | 6.98 | 7.71 | 4-Acid Digestion |
Cu, Copper (ppm) | 245 | 5 | 237 | 252 | 4-Acid Digestion |
Dy, Dysprosium (ppm) | 2.30 | 0.107 | 2.11 | 2.49 | 4-Acid Digestion |
Eu, Europium (ppm) | 0.68 | 0.023 | 0.62 | 0.73 | 4-Acid Digestion |
Fe, Iron (wt.%) | 3.10 | 0.055 | 3.02 | 3.18 | 4-Acid Digestion |
Ga, Gallium (ppm) | 15.0 | 0.88 | 14.3 | 15.6 | 4-Acid Digestion |
Hf, Hafnium (ppm) | 2.61 | 0.164 | 2.38 | 2.85 | 4-Acid Digestion |
Ho, Holmium (ppm) | 0.45 | 0.035 | 0.39 | 0.50 | 4-Acid Digestion |
In, Indium (ppm) | 0.067 | 0.005 | 0.059 | 0.074 | 4-Acid Digestion |
K, Potassium (wt.%) | 1.82 | 0.038 | 1.76 | 1.87 | 4-Acid Digestion |
La, Lanthanum (ppm) | 30.3 | 1.27 | 28.8 | 31.7 | 4-Acid Digestion |
Li, Lithium (ppm) | 46.7 | 2.09 | 44.7 | 48.6 | 4-Acid Digestion |
Lu, Lutetium (ppm) | 0.20 | 0.010 | 0.18 | 0.22 | 4-Acid Digestion |
Mg, Magnesium (wt.%) | 0.828 | 0.030 | 0.800 | 0.856 | 4-Acid Digestion |
Mn, Manganese (wt.%) | 0.030 | 0.001 | 0.029 | 0.031 | 4-Acid Digestion |
Mo, Molybdenum (ppm) | 29.1 | 1.38 | 27.6 | 30.7 | 4-Acid Digestion |
Na, Sodium (wt.%) | 0.264 | 0.010 | 0.253 | 0.275 | 4-Acid Digestion |
Nb, Niobium (ppm) | 8.80 | 0.742 | 8.10 | 9.50 | 4-Acid Digestion |
Nd, Neodymium (ppm) | 25.8 | 0.77 | 24.0 | 27.6 | 4-Acid Digestion |
Ni, Nickel (ppm) | 31.0 | 1.36 | 30.1 | 32.0 | 4-Acid Digestion |
P, Phosphorus (wt.%) | 0.037 | 0.001 | 0.035 | 0.038 | 4-Acid Digestion |
Pb, Lead (ppm) | 43.0 | 2.41 | 40.5 | 45.4 | 4-Acid Digestion |
Rb, Rubidium (ppm) | 117 | 4 | 111 | 124 | 4-Acid Digestion |
Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | 4-Acid Digestion |
S, Sulphur (wt.%) | 0.868 | 0.016 | 0.842 | 0.895 | 4-Acid Digestion |
Sb, Antimony (wt.%) | 0.365 | 0.021 | 0.348 | 0.381 | 4-Acid Digestion |
Sc, Scandium (ppm) | 7.42 | 0.282 | 7.01 | 7.83 | 4-Acid Digestion |
Se, Selenium (ppm) | 2.23 | 0.49 | 1.43 | 3.03 | 4-Acid Digestion |
Sm, Samarium (ppm) | 4.72 | 0.165 | 4.33 | 5.12 | 4-Acid Digestion |
Sn, Tin (ppm) | 3.01 | 0.244 | 2.81 | 3.21 | 4-Acid Digestion |
Sr, Strontium (ppm) | 89 | 2.4 | 85 | 92 | 4-Acid Digestion |
Ta, Tantalum (ppm) | 0.59 | 0.030 | 0.54 | 0.63 | 4-Acid Digestion |
Tb, Terbium (ppm) | 0.43 | 0.019 | 0.38 | 0.48 | 4-Acid Digestion |
Te, Tellurium (ppm) | 0.16 | 0.02 | 0.12 | 0.20 | 4-Acid Digestion |
Th, Thorium (ppm) | 10.1 | 0.44 | 9.4 | 10.8 | 4-Acid Digestion |
Ti, Titanium (wt.%) | 0.209 | 0.008 | 0.201 | 0.218 | 4-Acid Digestion |
Tl, Thallium (ppm) | 0.68 | 0.050 | 0.64 | 0.72 | 4-Acid Digestion |
U, Uranium (ppm) | 2.27 | 0.120 | 2.13 | 2.40 | 4-Acid Digestion |
V, Vanadium (ppm) | 57 | 2.4 | 54 | 59 | 4-Acid Digestion |
W, Tungsten (ppm) | 7.73 | 0.83 | 7.02 | 8.44 | 4-Acid Digestion |
Yb, Ytterbium (ppm) | 1.33 | 0.081 | 1.16 | 1.49 | 4-Acid Digestion |
Zn, Zinc (ppm) | 80 | 2.7 | 78 | 83 | 4-Acid Digestion |
Zr, Zirconium (ppm) | 87 | 2.4 | 84 | 91 | 4-Acid Digestion |
Ag, Silver (ppm) | 15.0 | 0.46 | 14.5 | 15.6 | Aqua Regia Digestion |
Al, Aluminium (wt.%) | 0.915 | 0.073 | 0.829 | 1.002 | Aqua Regia Digestion |
As, Arsenic (wt.%) | 0.382 | 0.012 | 0.370 | 0.394 | Aqua Regia Digestion |
Ba, Barium (ppm) | 75 | 5.3 | 68 | 82 | Aqua Regia Digestion |
Be, Beryllium (ppm) | 0.63 | 0.020 | 0.59 | 0.67 | Aqua Regia Digestion |
Bi, Bismuth (ppm) | 0.66 | 0.025 | 0.63 | 0.70 | Aqua Regia Digestion |
Ca, Calcium (wt.%) | 0.560 | 0.019 | 0.538 | 0.582 | Aqua Regia Digestion |
Cd, Cadmium (ppm) | 0.097 | 0.015 | 0.083 | 0.112 | Aqua Regia Digestion |
Ce, Cerium (ppm) | 30.8 | 1.65 | 28.5 | 33.2 | Aqua Regia Digestion |
Co, Cobalt (ppm) | 9.73 | 0.543 | 9.18 | 10.27 | Aqua Regia Digestion |
Cr, Chromium (ppm) | 47.1 | 1.85 | 44.9 | 49.2 | Aqua Regia Digestion |
Cs, Caesium (ppm) | 2.20 | 0.194 | 2.04 | 2.36 | Aqua Regia Digestion |
Cu, Copper (ppm) | 245 | 8 | 239 | 252 | Aqua Regia Digestion |
Fe, Iron (wt.%) | 2.83 | 0.107 | 2.72 | 2.94 | Aqua Regia Digestion |
Ga, Gallium (ppm) | 4.18 | 0.53 | 3.77 | 4.58 | Aqua Regia Digestion |
Ge, Germanium (ppm) | 0.066 | 0.014 | 0.043 | 0.089 | Aqua Regia Digestion |
Hf, Hafnium (ppm) | 0.38 | 0.04 | 0.33 | 0.44 | Aqua Regia Digestion |
Hg, Mercury (ppm) | 0.17 | 0.02 | 0.14 | 0.19 | Aqua Regia Digestion |
In, Indium (ppm) | 0.039 | 0.002 | 0.036 | 0.042 | Aqua Regia Digestion |
K, Potassium (wt.%) | 0.359 | 0.028 | 0.327 | 0.391 | Aqua Regia Digestion |
La, Lanthanum (ppm) | 14.5 | 0.95 | 13.1 | 16.0 | Aqua Regia Digestion |
Li, Lithium (ppm) | 7.42 | 0.614 | 6.75 | 8.08 | Aqua Regia Digestion |
Mg, Magnesium (wt.%) | 0.592 | 0.016 | 0.573 | 0.610 | Aqua Regia Digestion |
Mn, Manganese (wt.%) | 0.026 | 0.001 | 0.026 | 0.027 | Aqua Regia Digestion |
Mo, Molybdenum (ppm) | 27.1 | 1.42 | 26.0 | 28.2 | Aqua Regia Digestion |
Na, Sodium (wt.%) | 0.035 | 0.006 | 0.028 | 0.041 | Aqua Regia Digestion |
Ni, Nickel (ppm) | 29.4 | 1.19 | 27.6 | 31.1 | Aqua Regia Digestion |
P, Phosphorus (wt.%) | 0.031 | 0.001 | 0.029 | 0.033 | Aqua Regia Digestion |
Pb, Lead (ppm) | 36.7 | 1.34 | 34.8 | 38.6 | Aqua Regia Digestion |
Rb, Rubidium (ppm) | 23.1 | 2.09 | 21.1 | 25.0 | Aqua Regia Digestion |
S, Sulphur (wt.%) | 0.865 | 0.021 | 0.844 | 0.885 | Aqua Regia Digestion |
Sb, Antimony (wt.%) | 0.313 | 0.018 | 0.296 | 0.330 | Aqua Regia Digestion |
Sc, Scandium (ppm) | 2.18 | 0.211 | 1.94 | 2.42 | Aqua Regia Digestion |
Se, Selenium (ppm) | 1.96 | 0.21 | 1.64 | 2.27 | Aqua Regia Digestion |
Sn, Tin (ppm) | 1.08 | 0.069 | 1.00 | 1.17 | Aqua Regia Digestion |
Sr, Strontium (ppm) | 45.7 | 3.06 | 43.2 | 48.1 | Aqua Regia Digestion |
Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
Te, Tellurium (ppm) | 0.13 | 0.02 | 0.11 | 0.15 | Aqua Regia Digestion |
Th, Thorium (ppm) | 6.34 | 0.246 | 5.83 | 6.85 | Aqua Regia Digestion |
Ti, Titanium (wt.%) | 0.010 | 0.001 | 0.009 | 0.011 | Aqua Regia Digestion |
Tl, Thallium (ppm) | 0.21 | 0.020 | 0.20 | 0.23 | Aqua Regia Digestion |
U, Uranium (ppm) | 0.99 | 0.044 | 0.94 | 1.05 | Aqua Regia Digestion |
V, Vanadium (ppm) | 17.4 | 1.19 | 16.0 | 18.8 | Aqua Regia Digestion |
W, Tungsten (ppm) | 2.50 | 0.32 | 2.24 | 2.77 | Aqua Regia Digestion |
Y, Yttrium (ppm) | 5.12 | 0.247 | 4.85 | 5.40 | Aqua Regia Digestion |
Zn, Zinc (ppm) | 74 | 1.7 | 71 | 76 | Aqua Regia Digestion |
Zr, Zirconium (ppm) | 13.3 | 0.56 | 12.7 | 13.9 | Aqua Regia Digestion |