OREAS 268
oxide
siltstone
low sulphidation epithermal
OREAS 268
SKU: 268
OREAS 268 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 New South Wales and Victoria in
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 metamorphosed turbidite sequence of interbedded sandstones, siltstones
and shales. Epithermal and mesothermal gold mineralisation occurs within quartz
veining, stockworks and breccias associated with Permian felsic volcanic units
and Proterozoic batholith. Thirty-one commercial analytical laboratories
participated in the program to certify the elements reported below.
Gold by fire assay (25-50g charge weight) with AAS and ICP-OES finish;
Gold by aqua regia digestion (15-50g sample weight) with ICP-OES and/or
ICP-MS finish;
Gold by cyanide leach (20-200g) with AAS or ICP-MS finish;
Gold by x-ray photon assay with recommended gross mass 460-490g (12
Chrysos PhotonAssay units at 7 laboratories with two rounds of data reported
from each unit);
Full ICP-OES and ICP-MS elemental suites by 4-acid 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 subsamples (see Table 6 in the
‘Homogeneity Evaluation’ section of the Certificate).
Specifications
- State: oxide
- Matrix: siltstone
- Mineralisation: low sulphidation epithermal
- CRM Group: Au >1 ppm, Au only
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL High | Method |
|---|---|---|---|---|---|
| Au, Gold (ppm) | 11.42 | 0.332 | 11.28 | 11.56 | Pb Fire Assay |
| Au, Gold (ppm) | 11.67 | 0.214 | 11.58 | 11.76 | PhotonAssay |
| Au, Gold (ppm) | 11.29 | 0.519 | 11.07 | 11.51 | Aqua Regia Digestion (sample weights 10-50g) |
| Au, Gold (ppm) | 11.17 | 0.277 | 11.05 | 11.29 | Cyanide Leach |
| Ag, Silver (ppm) | 4.86 | 0.211 | 4.62 | 5.09 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 5.18 | 0.162 | 5.05 | 5.31 | 4-Acid Digestion |
| As, Arsenic (ppm) | 134 | 4 | 130 | 139 | 4-Acid Digestion |
| Ba, Barium (ppm) | 385 | 12 | 374 | 397 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 1.92 | 0.135 | 1.77 | 2.07 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 5.31 | 0.385 | 4.86 | 5.75 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 1.18 | 0.046 | 1.14 | 1.22 | 4-Acid Digestion |
| Cd, Cadmium (ppm) | 0.041 | 0.014 | 0.025 | 0.056 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 61 | 2.6 | 59 | 64 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 11.1 | 0.43 | 10.5 | 11.7 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 94 | 7.9 | 87 | 100 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 6.05 | 0.270 | 5.79 | 6.32 | 4-Acid Digestion |
| Cu, Copper (ppm) | 27.1 | 1.22 | 25.7 | 28.5 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.14 | 0.147 | 2.95 | 3.34 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.52 | 0.129 | 1.39 | 1.65 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.03 | 0.074 | 0.94 | 1.12 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 2.95 | 0.088 | 2.86 | 3.05 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 15.0 | 0.62 | 14.3 | 15.6 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 4.15 | 0.156 | 3.82 | 4.48 | 4-Acid Digestion |
| Ge, Germanium (ppm) | 0.15 | 0.05 | 0.10 | 0.21 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 3.11 | 0.141 | 2.93 | 3.29 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.56 | 0.040 | 0.48 | 0.63 | 4-Acid Digestion |
| In, Indium (ppm) | 0.063 | 0.005 | 0.054 | 0.072 | 4-Acid Digestion |
| K, Potassium (wt.%) | 1.30 | 0.057 | 1.26 | 1.34 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 31.3 | 1.50 | 29.8 | 32.8 | 4-Acid Digestion |
| Li, Lithium (ppm) | 56 | 3.1 | 54 | 59 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.21 | 0.016 | 0.19 | 0.24 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 0.990 | 0.052 | 0.958 | 1.022 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.028 | 0.001 | 0.027 | 0.029 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 7.19 | 0.436 | 6.74 | 7.65 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 0.543 | 0.020 | 0.524 | 0.562 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 15.2 | 1.14 | 14.2 | 16.2 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 27.0 | 0.84 | 25.5 | 28.4 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 50 | 2.3 | 48 | 52 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.053 | 0.002 | 0.052 | 0.055 | 4-Acid Digestion |
| Pb, Lead (ppm) | 15.5 | 1.12 | 14.4 | 16.6 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 7.22 | 0.229 | 6.85 | 7.60 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 77 | 3.3 | 74 | 80 | 4-Acid Digestion |
| Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.028 | 0.004 | 0.022 | 0.034 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 4.83 | 0.244 | 4.61 | 5.06 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 9.23 | 0.467 | 8.76 | 9.70 | 4-Acid Digestion |
| Se, Selenium (ppm) | 0.95 | 0.21 | 0.61 | 1.28 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 5.12 | 0.148 | 4.82 | 5.41 | 4-Acid Digestion |
| Sn, Tin (ppm) | 6.51 | 0.409 | 6.09 | 6.93 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 170 | 4 | 166 | 175 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 1.04 | 0.092 | 0.95 | 1.12 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.54 | 0.036 | 0.51 | 0.57 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.12 | 0.03 | 0.07 | 0.18 | 4-Acid Digestion |
| Th, Thorium (ppm) | 9.36 | 0.489 | 8.88 | 9.84 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.393 | 0.017 | 0.376 | 0.410 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.46 | 0.028 | 0.44 | 0.48 | 4-Acid Digestion |
| Tm, Thulium (ppm) | 0.20 | 0.010 | 0.19 | 0.21 | 4-Acid Digestion |
| U, Uranium (ppm) | 1.82 | 0.086 | 1.72 | 1.93 | 4-Acid Digestion |
| V, Vanadium (ppm) | 69 | 2.2 | 66 | 72 | 4-Acid Digestion |
| W, Tungsten (ppm) | 25.2 | 1.26 | 23.4 | 27.0 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 13.7 | 0.91 | 12.9 | 14.5 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.36 | 0.100 | 1.24 | 1.49 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 47.8 | 2.37 | 45.7 | 49.9 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 113 | 6 | 108 | 118 | 4-Acid Digestion |
| Ag, Silver (ppm) | 4.65 | 0.132 | 4.48 | 4.81 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 0.918 | 0.067 | 0.874 | 0.961 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 116 | 4 | 111 | 120 | Aqua Regia Digestion |
| B, Boron (ppm) | < 10.0 | IND | IND | IND | Aqua Regia Digestion |
| Ba, Barium (ppm) | 79 | 7.4 | 74 | 84 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 0.56 | 0.032 | 0.53 | 0.60 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 4.70 | 0.327 | 4.36 | 5.04 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.332 | 0.025 | 0.315 | 0.350 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.031 | 0.007 | 0.017 | 0.046 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 35.2 | 3.20 | 32.9 | 37.5 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 7.22 | 0.79 | 6.70 | 7.73 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 43.7 | 2.21 | 42.0 | 45.4 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 1.39 | 0.18 | 1.25 | 1.53 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 22.8 | 1.38 | 21.5 | 24.0 | Aqua Regia Digestion |
| Eu, Europium (ppm) | 0.53 | 0.10 | 0.38 | 0.69 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 2.14 | 0.148 | 2.03 | 2.24 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 3.64 | 0.256 | 3.41 | 3.86 | Aqua Regia Digestion |
| Ge, Germanium (ppm) | 0.079 | 0.028 | 0.046 | 0.112 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.51 | 0.07 | 0.45 | 0.57 | Aqua Regia Digestion |
| Hg, Mercury (ppm) | 0.042 | 0.013 | 0.021 | 0.064 | Aqua Regia Digestion |
| Ho, Holmium (ppm) | 0.25 | 0.04 | 0.19 | 0.31 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.024 | 0.003 | 0.020 | 0.027 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.169 | 0.021 | 0.155 | 0.182 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 17.1 | 1.9 | 15.9 | 18.3 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 5.60 | 0.73 | 5.02 | 6.18 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 0.400 | 0.022 | 0.385 | 0.415 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.016 | 0.001 | 0.015 | 0.016 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 6.53 | 0.421 | 6.23 | 6.83 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.090 | 0.007 | 0.081 | 0.098 | Aqua Regia Digestion |
| Nb, Niobium (ppm) | 0.43 | 0.12 | 0.32 | 0.54 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 40.3 | 1.98 | 38.4 | 42.2 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.036 | 0.002 | 0.034 | 0.037 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 8.83 | 0.90 | 8.27 | 9.40 | Aqua Regia Digestion |
| Pr, Praseodymium (ppm) | 4.31 | 0.78 | 3.21 | 5.40 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 12.9 | 0.66 | 12.3 | 13.6 | Aqua Regia Digestion |
| Re, Rhenium (ppm) | < 0.001 | IND | IND | IND | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.022 | 0.003 | 0.020 | 0.024 | Aqua Regia Digestion |
| Sb, Antimony (ppm) | 1.82 | 0.21 | 1.67 | 1.96 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 2.19 | 0.192 | 2.05 | 2.34 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 1.36 | 0.25 | 1.17 | 1.55 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 35.4 | 4.2 | 32.9 | 37.9 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Tb, Terbium (ppm) | 0.29 | 0.021 | 0.26 | 0.33 | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.089 | 0.014 | 0.067 | 0.112 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 6.26 | 0.576 | 5.89 | 6.64 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.066 | 0.010 | 0.060 | 0.072 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.11 | 0.01 | 0.09 | 0.12 | Aqua Regia Digestion |
| U, Uranium (ppm) | 0.89 | 0.054 | 0.85 | 0.94 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 20.2 | 1.05 | 19.0 | 21.3 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 8.54 | 1.33 | 7.65 | 9.43 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 6.43 | 0.203 | 6.12 | 6.74 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 28.9 | 3.2 | 26.8 | 31.1 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 22.9 | 1.96 | 21.4 | 24.5 | Aqua Regia Digestion |
Product Specifications
State
oxide
Matrix
siltstone
Mineralisation
low sulphidation epithermal
Availability
available
Certified Reference Values
| Analyte | Certified Value | Uncertainty (1SD) | 95% Confidence Low | 95% Confidence High | Method |
|---|---|---|---|---|---|
| Ce - Cerium (ppm) | 61 | - | - | - | 4-Acid Digestion |
| Dy - Dysprosium (ppm) | 3.14 | - | - | - | 4-Acid Digestion |
| Er - Erbium (ppm) | 1.52 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.03 | - | - | - | 4-Acid Digestion |
| Gd - Gadolinium (ppm) | 4.15 | - | - | - | 4-Acid Digestion |
| Ho - Holmium (ppm) | 0.56 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 31.3 | - | - | - | 4-Acid Digestion |
| Lu - Lutetium (ppm) | 0.21 | - | - | - | 4-Acid Digestion |
| Nd - Neodymium (ppm) | 27.0 | - | - | - | 4-Acid Digestion |
| Pr - Praseodymium (ppm) | 7.22 | - | - | - | 4-Acid Digestion |
| Sm - Samarium (ppm) | 5.12 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.54 | - | - | - | 4-Acid Digestion |
| Tm - Thulium (ppm) | 0.20 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 13.7 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.36 | - | - | - | 4-Acid Digestion |
| Ag - Silver (ppm) | 4.65 | - | - | - | Aqua Regia |
| As - Arsenic (ppm) | 116 | - | - | - | Aqua Regia |
| Bi - Bismuth (ppm) | 4.70 | - | - | - | Aqua Regia |
| Cd - Cadmium (ppm) | 0.031 | - | - | - | Aqua Regia |
| Co - Cobalt (ppm) | 7.22 | - | - | - | Aqua Regia |
| Cu - Copper (ppm) | 22.8 | - | - | - | Aqua Regia |
| Hg - Mercury (ppm) | 0.042 | - | - | - | Aqua Regia |
| Mo - Molybdenum (ppm) | 6.53 | - | - | - | Aqua Regia |
| Pb - Lead (ppm) | 8.83 | - | - | - | Aqua Regia |
| Sb - Antimony (ppm) | 1.82 | - | - | - | Aqua Regia |
| Sn - Tin (ppm) | 1.36 | - | - | - | Aqua Regia |
| Te - Tellurium (ppm) | 0.089 | - | - | - | Aqua Regia |
| Zn - Zinc (ppm) | 28.9 | - | - | - | 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
Need Assistance?
Contact our technical team for custom orders, bulk pricing, or analytical support.
Contact Us