OREAS 267
SKU: 267
OREAS 267 was prepared from a blend of high-grade oxide gold ore and barren
materials (basaltic scoria and oxidised siliciclastic sediments). The scoria and
sediments were sourced from quarries located in the states of New South Wales
and Victoria, Australia. The gold ore was sourced from the Agate Creek Gold
Project located in the Etheridge Goldfield of northern Queensland, Australia.
The project is hosted within a i faulted block of Silurian age Granodiorite,
intruded by Permian rhyolitic ignimbrite dykes and vein breccias. Epithermal and
mesothermal gold mineralisation occurs within quartz veining, stockworks and
breccias associated with Permian rhyolitic volcanic dykes and highly fractured
granodiorite.
Thirty-eight commercial analytical laboratories participated in the program
to certify the elements reported below using the following methods:
Gold by Pb collection fire assay (25-50 g charge weight) with AAS,
ICP-OES or gravimetric finish
Gold by PhotonAssay™ with a recommended gross fill mass of 440-470 g
Gold by 15-50g aqua regia digestion with ICP-MS and AAS finish
Gold by cyanide leach (20-200g) via a variety of cyanide leach methods
(LeachWELL tablets, alkaline added sodium cyanide solution and sodium cyanide
liquor with LeachWELL powder) with ICP or AAS 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
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.
Specifications
- State: oxide
- Matrix: siliclastic sediment and basaltic scoria
- Mineralisation: epithermal
- CRM Group: Au >1 ppm, Au only
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL High | Method |
|---|---|---|---|---|---|
| Au, Gold (ppm) | 13.21 | 0.400 | 13.06 | 13.36 | Pb Fire Assay |
| Au, Gold (ppm) | 13.18 | 0.559 | 12.90 | 13.46 | Bi Fire Assay |
| Au, Gold (ppm) | 13.56 | 0.284 | 13.46 | 13.66 | PhotonAssay |
| Au, Gold (ppm) | 13.42 | 0.526 | 13.14 | 13.69 | Aqua Regia Digestion (sample weights 10-50g) |
| Au, Gold (ppm) | 12.96 | 0.643 | 12.65 | 13.26 | Cyanide Leach |
| Ag, Silver (ppm) | 5.54 | 0.215 | 5.32 | 5.76 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 5.05 | 0.186 | 4.91 | 5.18 | 4-Acid Digestion |
| As, Arsenic (ppm) | 137 | 5 | 131 | 142 | 4-Acid Digestion |
| Ba, Barium (ppm) | 381 | 12 | 369 | 393 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 1.80 | 0.072 | 1.73 | 1.88 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 1.28 | 0.123 | 1.17 | 1.39 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 1.13 | 0.031 | 1.10 | 1.16 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 58 | 3.2 | 55 | 62 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 11.0 | 0.26 | 10.6 | 11.5 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 98 | 7.1 | 92 | 104 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 5.50 | 0.154 | 5.25 | 5.75 | 4-Acid Digestion |
| Cu, Copper (ppm) | 23.9 | 1.39 | 22.6 | 25.2 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.07 | 0.092 | 2.87 | 3.27 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.50 | 0.093 | 1.33 | 1.67 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.03 | 0.039 | 0.93 | 1.13 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 2.86 | 0.068 | 2.80 | 2.93 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 14.5 | 0.74 | 13.7 | 15.3 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 4.10 | 0.324 | 3.52 | 4.69 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 2.96 | 0.195 | 2.75 | 3.17 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.56 | 0.029 | 0.51 | 0.62 | 4-Acid Digestion |
| In, Indium (ppm) | 0.061 | 0.005 | 0.052 | 0.069 | 4-Acid Digestion |
| K, Potassium (wt.%) | 1.25 | 0.023 | 1.22 | 1.27 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 31.0 | 1.28 | 29.7 | 32.2 | 4-Acid Digestion |
| Li, Lithium (ppm) | 55 | 2.1 | 53 | 57 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.20 | 0.007 | 0.18 | 0.22 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 0.929 | 0.034 | 0.904 | 0.953 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.028 | 0.001 | 0.027 | 0.028 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 6.94 | 0.345 | 6.55 | 7.32 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 0.505 | 0.022 | 0.489 | 0.520 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 13.9 | 0.98 | 13.0 | 14.7 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 26.7 | 0.85 | 25.1 | 28.2 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 48.9 | 2.39 | 46.7 | 51.1 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.048 | 0.001 | 0.046 | 0.049 | 4-Acid Digestion |
| Pb, Lead (ppm) | 15.2 | 1.50 | 13.9 | 16.5 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 6.95 | 0.341 | 6.45 | 7.45 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 71 | 2.6 | 68 | 74 | 4-Acid Digestion |
| Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.024 | 0.004 | 0.023 | 0.026 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 5.15 | 1.59 | 4.15 | 6.14 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 9.25 | 0.602 | 8.72 | 9.78 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 5.11 | 0.186 | 4.72 | 5.49 | 4-Acid Digestion |
| Sn, Tin (ppm) | 5.95 | 0.288 | 5.56 | 6.34 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 159 | 4 | 155 | 163 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 0.93 | 0.037 | 0.87 | 0.99 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.54 | 0.016 | 0.52 | 0.57 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.068 | 0.011 | 0.038 | 0.098 | 4-Acid Digestion |
| Th, Thorium (ppm) | 9.13 | 0.340 | 8.74 | 9.53 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.373 | 0.013 | 0.361 | 0.385 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.39 | 0.025 | 0.37 | 0.42 | 4-Acid Digestion |
| U, Uranium (ppm) | 1.93 | 0.121 | 1.81 | 2.05 | 4-Acid Digestion |
| V, Vanadium (ppm) | 68 | 1.9 | 66 | 70 | 4-Acid Digestion |
| W, Tungsten (ppm) | 7.32 | 0.360 | 6.99 | 7.65 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 14.0 | 0.70 | 13.2 | 14.8 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.38 | 0.070 | 1.26 | 1.49 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 43.4 | 1.60 | 41.8 | 45.1 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 112 | 3 | 107 | 118 | 4-Acid Digestion |
| Ag, Silver (ppm) | 5.35 | 0.180 | 5.16 | 5.54 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 0.879 | 0.080 | 0.820 | 0.938 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 112 | 4 | 107 | 116 | Aqua Regia Digestion |
| Ba, Barium (ppm) | 71 | 9 | 67 | 76 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 0.52 | 0.018 | 0.49 | 0.55 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 1.03 | 0.085 | 0.94 | 1.13 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.279 | 0.024 | 0.262 | 0.296 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 31.9 | 2.61 | 29.7 | 34.0 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 7.02 | 0.582 | 6.53 | 7.50 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 46.8 | 2.09 | 44.8 | 48.7 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 1.18 | 0.057 | 1.13 | 1.24 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 19.7 | 1.10 | 18.7 | 20.7 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 2.02 | 0.094 | 1.94 | 2.11 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 3.71 | 0.43 | 3.41 | 4.02 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.48 | 0.05 | 0.44 | 0.53 | Aqua Regia Digestion |
| Hg, Mercury (ppm) | 0.043 | 0.008 | 0.030 | 0.055 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.020 | 0.002 | 0.017 | 0.024 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.158 | 0.020 | 0.144 | 0.172 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 15.2 | 1.30 | 14.1 | 16.2 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 5.56 | 0.60 | 5.10 | 6.01 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 0.371 | 0.022 | 0.353 | 0.389 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.015 | 0.001 | 0.014 | 0.015 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 5.89 | 0.235 | 5.69 | 6.09 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.083 | 0.012 | 0.072 | 0.093 | Aqua Regia Digestion |
| Nb, Niobium (ppm) | 0.35 | 0.07 | 0.29 | 0.41 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 39.6 | 2.59 | 37.3 | 42.0 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.032 | 0.001 | 0.030 | 0.033 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 8.60 | 0.92 | 7.91 | 9.30 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 11.2 | 0.91 | 10.4 | 12.1 | Aqua Regia Digestion |
| Re, Rhenium (ppm) | < 0.001 | IND | IND | IND | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.022 | 0.004 | 0.020 | 0.024 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 2.23 | 0.198 | 1.99 | 2.47 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 1.18 | 0.16 | 1.01 | 1.34 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 30.6 | 3.1 | 28.2 | 33.1 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.053 | 0.011 | 0.032 | 0.075 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 5.96 | 0.328 | 5.65 | 6.28 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.060 | 0.011 | 0.053 | 0.067 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.090 | 0.013 | 0.079 | 0.101 | Aqua Regia Digestion |
| U, Uranium (ppm) | 0.90 | 0.035 | 0.85 | 0.95 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 20.8 | 0.75 | 19.7 | 21.9 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 1.81 | 0.25 | 1.57 | 2.06 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 6.29 | 0.463 | 5.92 | 6.66 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 23.5 | 2.34 | 21.8 | 25.2 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 21.3 | 1.03 | 20.2 | 22.3 | Aqua Regia Digestion |
Product Specifications
Certified Reference Values
| Analyte | Certified Value | Uncertainty (1SD) | 95% Confidence Low | 95% Confidence High | Method |
|---|---|---|---|---|---|
| Ce - Cerium (ppm) | 58 | - | - | - | 4-Acid Digestion |
| Dy - Dysprosium (ppm) | 3.07 | - | - | - | 4-Acid Digestion |
| Er - Erbium (ppm) | 1.50 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.03 | - | - | - | 4-Acid Digestion |
| Gd - Gadolinium (ppm) | 4.10 | - | - | - | 4-Acid Digestion |
| Ho - Holmium (ppm) | 0.56 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 31.0 | - | - | - | 4-Acid Digestion |
| Lu - Lutetium (ppm) | 0.20 | - | - | - | 4-Acid Digestion |
| Nd - Neodymium (ppm) | 26.7 | - | - | - | 4-Acid Digestion |
| Pr - Praseodymium (ppm) | 6.95 | - | - | - | 4-Acid Digestion |
| Sm - Samarium (ppm) | 5.11 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.54 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 14.0 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.38 | - | - | - | 4-Acid Digestion |
| Ag - Silver (ppm) | 5.35 | - | - | - | Aqua Regia |
| As - Arsenic (ppm) | 112 | - | - | - | Aqua Regia |
| Bi - Bismuth (ppm) | 1.03 | - | - | - | Aqua Regia |
| Co - Cobalt (ppm) | 7.02 | - | - | - | Aqua Regia |
| Cu - Copper (ppm) | 19.7 | - | - | - | Aqua Regia |
| Hg - Mercury (ppm) | 0.043 | - | - | - | Aqua Regia |
| Ni - Nickel (ppm) | 39.6 | - | - | - | Aqua Regia |
| Pb - Lead (ppm) | 8.60 | - | - | - | Aqua Regia |
| Sn - Tin (ppm) | 1.18 | - | - | - | Aqua Regia |
| Te - Tellurium (ppm) | 0.053 | - | - | - | Aqua Regia |
| Zn - Zinc (ppm) | 23.5 | - | - | - | Aqua Regia |
SD = Standard Deviation | CL = 95% Confidence Limits
Methods: AR = Aqua Regia, 4-Acid = 4-Acid Digestion, LBF = Lithium Borate Fusion, FA/AAS = Fire Assay with Atomic Absorption, LECO = LECO Combustion Analysis
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