OREAS 251c
SKU: 251c
OREAS 251c was prepared from a blend of gold-bearing oxide ore and barren
metasediments. The ore (Wilber Lode) was sourced from the Andy Well Gold Project
located approximately 45km north of Meekatharra in the Murchison region of
Western Australia. The Wilber Lode is a shear- hosted, narrow vein, quartz
lode-style gold deposit situated within the Meekatharra-Wydgee greenstone belt
in the Archaean Yilgarn Craton of Western Australia. The common primary mineral
assemblage as stated by Mason and Harris (2011, 2012, cited in Hingston et al,
2014) is quartz, calcite, chlorite, fuchsite, pyrite, galena, sphalerite,
chalcopyrite and gold. The host rock consists of a complex sequence of weathered
Archaean meta-basalt and meta-porphyritic rocks derived from a primary
mineralogy of albite, actinolite, chlorite, sericite, biotite, calcite, zoisite,
muscovite, quartz and titanate. 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 PhotonAssay with recommended gross mass 495-525g (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: weathered greenstone/ sediments/ scoria
- Mineralisation: orogenic lode gold
- CRM Group: Au, Au only
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL High | Method |
|---|---|---|---|---|---|
| Au, Gold (ppm) | 0.508 | 0.014 | 0.502 | 0.514 | Pb Fire Assay |
| Au, Gold (ppm) | 0.501 | 0.033 | 0.495 | 0.506 | PhotonAssay |
| Au, Gold (ppm) | 0.485 | 0.022 | 0.476 | 0.494 | Aqua Regia Digestion (sample weights 10-50g) |
| Au, Gold (ppm) | 0.492 | 0.021 | 0.484 | 0.501 | Cyanide Leach |
| Ag, Silver (ppm) | 0.296 | 0.028 | 0.261 | 0.332 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 6.77 | 0.171 | 6.60 | 6.94 | 4-Acid Digestion |
| As, Arsenic (ppm) | 175 | 5 | 169 | 181 | 4-Acid Digestion |
| Ba, Barium (ppm) | 509 | 12 | 496 | 522 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 2.39 | 0.158 | 2.19 | 2.59 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 7.52 | 0.551 | 6.90 | 8.15 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 1.71 | 0.040 | 1.67 | 1.76 | 4-Acid Digestion |
| Cd, Cadmium (ppm) | 0.051 | 0.023 | 0.025 | 0.077 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 88 | 4.4 | 84 | 93 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 17.2 | 0.59 | 16.5 | 17.8 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 120 | 9 | 114 | 126 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 5.94 | 0.232 | 5.70 | 6.18 | 4-Acid Digestion |
| Cu, Copper (ppm) | 27.5 | 1.65 | 26.1 | 28.9 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 4.28 | 0.245 | 4.03 | 4.53 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.96 | 0.159 | 1.78 | 2.14 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.68 | 0.080 | 1.56 | 1.80 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 4.28 | 0.113 | 4.17 | 4.39 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 18.9 | 0.77 | 18.0 | 19.8 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 5.80 | 0.230 | 5.49 | 6.12 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 4.70 | 0.202 | 4.45 | 4.95 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.72 | 0.071 | 0.64 | 0.81 | 4-Acid Digestion |
| In, Indium (ppm) | 0.087 | 0.009 | 0.079 | 0.096 | 4-Acid Digestion |
| K, Potassium (wt.%) | 1.87 | 0.072 | 1.81 | 1.93 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 45.3 | 2.90 | 43.0 | 47.6 | 4-Acid Digestion |
| Li, Lithium (ppm) | 30.6 | 1.61 | 29.4 | 31.8 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.26 | 0.021 | 0.23 | 0.30 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 1.37 | 0.058 | 1.32 | 1.41 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.041 | 0.002 | 0.040 | 0.043 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 2.48 | 0.183 | 2.32 | 2.65 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 0.957 | 0.038 | 0.930 | 0.984 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 26.3 | 1.95 | 24.7 | 28.0 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 38.4 | 1.70 | 36.4 | 40.4 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 72 | 2.5 | 70 | 74 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.092 | 0.003 | 0.089 | 0.094 | 4-Acid Digestion |
| Pb, Lead (ppm) | 13.3 | 1.13 | 12.6 | 14.1 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 10.2 | 0.53 | 9.6 | 10.8 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 99 | 3.2 | 96 | 103 | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.010 | 0.000 | 0.009 | 0.010 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 2.65 | 0.182 | 2.48 | 2.83 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 12.9 | 0.61 | 12.2 | 13.6 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 7.34 | 0.437 | 6.89 | 7.80 | 4-Acid Digestion |
| Sn, Tin (ppm) | 8.95 | 0.666 | 8.33 | 9.56 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 280 | 8 | 272 | 288 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 1.83 | 0.144 | 1.72 | 1.95 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.77 | 0.031 | 0.71 | 0.82 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.12 | 0.03 | 0.09 | 0.15 | 4-Acid Digestion |
| Th, Thorium (ppm) | 12.3 | 0.76 | 11.7 | 12.9 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.593 | 0.021 | 0.572 | 0.614 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.52 | 0.029 | 0.49 | 0.55 | 4-Acid Digestion |
| Tm, Thulium (ppm) | 0.25 | 0.04 | 0.22 | 0.29 | 4-Acid Digestion |
| U, Uranium (ppm) | 2.18 | 0.166 | 2.06 | 2.30 | 4-Acid Digestion |
| V, Vanadium (ppm) | 92 | 2.8 | 89 | 95 | 4-Acid Digestion |
| W, Tungsten (ppm) | 31.5 | 2.43 | 29.0 | 33.9 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 18.3 | 1.30 | 17.2 | 19.4 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.72 | 0.145 | 1.58 | 1.87 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 69 | 2.6 | 67 | 72 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 183 | 8 | 176 | 190 | 4-Acid Digestion |
| Ag, Silver (ppm) | 0.269 | 0.028 | 0.243 | 0.295 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 1.13 | 0.070 | 1.06 | 1.19 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 153 | 5 | 148 | 158 | Aqua Regia Digestion |
| B, Boron (ppm) | < 10.0 | IND | IND | IND | Aqua Regia Digestion |
| Ba, Barium (ppm) | 72 | 6.2 | 67 | 77 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 0.93 | 0.072 | 0.88 | 0.99 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 6.83 | 0.670 | 6.25 | 7.40 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.437 | 0.040 | 0.410 | 0.463 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.026 | 0.008 | 0.015 | 0.037 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 52 | 5.1 | 49 | 56 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 11.6 | 1.01 | 10.8 | 12.4 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 46.3 | 5.8 | 42.7 | 49.8 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 1.43 | 0.16 | 1.30 | 1.56 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 22.7 | 1.13 | 21.6 | 23.8 | Aqua Regia Digestion |
| Eu, Europium (ppm) | 0.94 | 0.074 | 0.82 | 1.07 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 3.03 | 0.275 | 2.87 | 3.19 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 3.94 | 0.376 | 3.63 | 4.26 | Aqua Regia Digestion |
| Ho, Holmium (ppm) | 0.38 | 0.04 | 0.33 | 0.43 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.026 | 0.003 | 0.023 | 0.029 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.186 | 0.019 | 0.172 | 0.201 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 26.7 | 2.9 | 24.9 | 28.5 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 6.78 | 0.437 | 6.30 | 7.25 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 0.539 | 0.051 | 0.509 | 0.569 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.023 | 0.003 | 0.021 | 0.024 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 1.96 | 0.134 | 1.82 | 2.09 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.192 | 0.010 | 0.182 | 0.201 | Aqua Regia Digestion |
| Nb, Niobium (ppm) | 0.62 | 0.16 | 0.47 | 0.77 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 57 | 3.0 | 54 | 59 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.065 | 0.003 | 0.062 | 0.067 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 8.01 | 1.27 | 7.20 | 8.82 | Aqua Regia Digestion |
| Pr, Praseodymium (ppm) | 7.40 | 1.75 | 4.99 | 9.81 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 13.1 | 0.77 | 12.3 | 13.9 | Aqua Regia Digestion |
| Re, Rhenium (ppm) | < 0.001 | IND | IND | IND | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.010 | 0.004 | 0.007 | 0.012 | Aqua Regia Digestion |
| Sb, Antimony (ppm) | 1.66 | 0.22 | 1.52 | 1.80 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 3.01 | 0.32 | 2.76 | 3.26 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 1.46 | 0.110 | 1.33 | 1.58 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 39.2 | 4.0 | 36.6 | 41.9 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Tb, Terbium (ppm) | 0.49 | 0.09 | 0.36 | 0.61 | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.083 | 0.016 | 0.065 | 0.100 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 8.67 | 0.90 | 8.09 | 9.25 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.112 | 0.027 | 0.096 | 0.127 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.088 | 0.014 | 0.077 | 0.099 | Aqua Regia Digestion |
| U, Uranium (ppm) | 1.05 | 0.073 | 0.99 | 1.12 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 29.4 | 2.58 | 27.7 | 31.0 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 9.78 | 1.68 | 8.67 | 10.89 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 9.19 | 0.520 | 8.72 | 9.65 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 42.2 | 5.6 | 38.8 | 45.5 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 29.4 | 6.5 | 24.5 | 34.3 | Aqua Regia Digestion |
Product Specifications
Certified Reference Values
| Analyte | Certified Value | Uncertainty (1SD) | 95% Confidence Low | 95% Confidence High | Method |
|---|---|---|---|---|---|
| Ce - Cerium (ppm) | 88 | - | - | - | 4-Acid Digestion |
| Dy - Dysprosium (ppm) | 4.28 | - | - | - | 4-Acid Digestion |
| Er - Erbium (ppm) | 1.96 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.68 | - | - | - | 4-Acid Digestion |
| Gd - Gadolinium (ppm) | 5.80 | - | - | - | 4-Acid Digestion |
| Ho - Holmium (ppm) | 0.72 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 45.3 | - | - | - | 4-Acid Digestion |
| Lu - Lutetium (ppm) | 0.26 | - | - | - | 4-Acid Digestion |
| Nd - Neodymium (ppm) | 38.4 | - | - | - | 4-Acid Digestion |
| Pr - Praseodymium (ppm) | 10.2 | - | - | - | 4-Acid Digestion |
| Sm - Samarium (ppm) | 7.34 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.77 | - | - | - | 4-Acid Digestion |
| Tm - Thulium (ppm) | 0.25 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 18.3 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.72 | - | - | - | 4-Acid Digestion |
| Ag - Silver (ppm) | 0.269 | - | - | - | Aqua Regia |
| As - Arsenic (ppm) | 153 | - | - | - | Aqua Regia |
| Bi - Bismuth (ppm) | 6.83 | - | - | - | Aqua Regia |
| Cd - Cadmium (ppm) | 0.026 | - | - | - | Aqua Regia |
| Co - Cobalt (ppm) | 11.6 | - | - | - | Aqua Regia |
| Cu - Copper (ppm) | 22.7 | - | - | - | Aqua Regia |
| Mo - Molybdenum (ppm) | 1.96 | - | - | - | Aqua Regia |
| Tl - Thallium (ppm) | 0.088 | - | - | - | 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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