OREAS 234b
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Description
Description
OREAS 234b was prepared from a blend of gold-bearing ore and barren greenstone. The ore was sourced from the Frogs Leg Gold Mine located 19km west of Kalgoorlie in Western Australia. The ore lodes lie within sheared contacts between volcaniclastics and basalt and are hosted in laminated quartz veins, breccia and wall rock alteration. The Cambrian greenstone was sourced from a quarry 145km north of Melbourne, Australia.
Thirty-six commercial analytical laboratories participated in the program to certify the elements reported below. The following methods were employed:
- Gold by fire assay (15-50g charge weight) with AAS, ICP-OES or ICP-MS finish.
- Gold by aqua regia digestion (10-50g sample weight) with ICP-OES or ICP-MS finish.
- Gold by cyanide leach (5-200g sample weight) by a variety of cyanide leach methods including LeachWELL, alkaline added sodium cyanide solution or sodium cyanide liquor with LeachWELL. Finishes included AAS, ICP-OES or ICP-MS.
- 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.
Gold homogeneity was confirmed by instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples undertaken at ANSTO, Lucas Heights.
|
Analyte
|
Certified Value
|
1SD
|
Expanded Uncertainty Low
|
Expanded Uncertainty High
|
Method
|
|---|---|---|---|---|---|
| Au, Gold (ppm) | 1.234 | 0.037 | 1.221 | 1.248 | Pb Fire Assay |
| Au, Gold (ppm) | 1.219 | 0.050 | 1.211 | 1.228 | PhotonAssay |
| Au, Gold (ppm) | 1.172 | 0.045 | 1.153 | 1.192 | Aqua Regia Digestion (sample weights 10-50g) |
| Au, Gold (ppm) | 1.173 | 0.058 | 1.146 | 1.200 | Cyanide Leach |
| Ag, Silver (ppm) | 0.348 | 0.021 | 0.325 | 0.371 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 6.72 | 0.223 | 6.54 | 6.90 | 4-Acid Digestion |
| As, Arsenic (ppm) | 65 | 2.9 | 63 | 67 | 4-Acid Digestion |
| Ba, Barium (ppm) | 290 | 10 | 278 | 302 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 0.44 | 0.05 | 0.40 | 0.47 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 0.047 | 0.007 | 0.037 | 0.058 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 6.15 | 0.248 | 5.98 | 6.31 | 4-Acid Digestion |
| Cd, Cadmium (ppm) | 0.62 | 0.041 | 0.57 | 0.67 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 13.1 | 0.81 | 12.5 | 13.7 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 43.2 | 2.49 | 41.7 | 44.7 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 144 | 17 | 136 | 153 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 0.95 | 0.050 | 0.91 | 1.00 | 4-Acid Digestion |
| Cu, Copper (ppm) | 162 | 7 | 157 | 167 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.59 | 0.162 | 3.35 | 3.83 | 4-Acid Digestion |
| Er, Erbium (ppm) | 2.17 | 0.129 | 2.01 | 2.33 | 4-Acid Digestion |
| Eu, Europium (ppm) | 0.91 | 0.051 | 0.84 | 0.98 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 7.83 | 0.330 | 7.62 | 8.03 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 15.2 | 0.70 | 14.6 | 15.9 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 2.96 | 0.211 | 2.70 | 3.23 | 4-Acid Digestion |
| Ge, Germanium (ppm) | 0.088 | 0.020 | 0.068 | 0.107 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 1.64 | 0.19 | 1.49 | 1.79 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.74 | 0.045 | 0.67 | 0.80 | 4-Acid Digestion |
| In, Indium (ppm) | 0.075 | 0.007 | 0.065 | 0.084 | 4-Acid Digestion |
| K, Potassium (wt.%) | 0.578 | 0.026 | 0.559 | 0.596 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 5.61 | 0.393 | 5.34 | 5.89 | 4-Acid Digestion |
| Li, Lithium (ppm) | 12.2 | 0.84 | 11.5 | 12.8 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.31 | 0.026 | 0.27 | 0.35 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 3.76 | 0.163 | 3.67 | 3.86 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.148 | 0.005 | 0.144 | 0.152 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 2.57 | 0.239 | 2.41 | 2.73 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 1.94 | 0.073 | 1.88 | 2.00 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 3.59 | 0.290 | 3.33 | 3.85 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 8.39 | 0.343 | 7.92 | 8.87 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 97 | 4.0 | 94 | 100 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.043 | 0.001 | 0.042 | 0.045 | 4-Acid Digestion |
| Pb, Lead (ppm) | 26.2 | 1.36 | 25.1 | 27.4 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 1.75 | 0.081 | 1.64 | 1.86 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 15.2 | 0.91 | 14.4 | 15.9 | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.405 | 0.010 | 0.393 | 0.417 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 1.43 | 0.086 | 1.32 | 1.53 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 36.8 | 2.22 | 35.2 | 38.3 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 2.48 | 0.110 | 2.29 | 2.68 | 4-Acid Digestion |
| Sn, Tin (ppm) | 1.14 | 0.17 | 1.03 | 1.25 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 194 | 9 | 186 | 202 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 0.24 | 0.04 | 0.21 | 0.27 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.54 | 0.043 | 0.50 | 0.58 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.10 | 0.02 | 0.07 | 0.13 | 4-Acid Digestion |
| Th, Thorium (ppm) | 1.02 | 0.074 | 0.95 | 1.09 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.592 | 0.014 | 0.575 | 0.609 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.23 | 0.014 | 0.21 | 0.24 | 4-Acid Digestion |
| Tm, Thulium (ppm) | 0.31 | 0.024 | 0.28 | 0.35 | 4-Acid Digestion |
| U, Uranium (ppm) | 0.30 | 0.010 | 0.29 | 0.31 | 4-Acid Digestion |
| V, Vanadium (ppm) | 258 | 10 | 250 | 266 | 4-Acid Digestion |
| W, Tungsten (ppm) | 33.3 | 2.56 | 31.7 | 34.9 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 19.4 | 1.19 | 18.6 | 20.3 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 2.03 | 0.168 | 1.86 | 2.20 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 143 | 7 | 139 | 147 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 49.6 | 6.3 | 45.9 | 53.2 | 4-Acid Digestion |
| Ag, Silver (ppm) | 0.343 | 0.021 | 0.316 | 0.370 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 3.12 | 0.259 | 2.99 | 3.24 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 65 | 2.8 | 63 | 67 | Aqua Regia Digestion |
| B, Boron (ppm) | 26.9 | 7.3 | 21.3 | 32.4 | Aqua Regia Digestion |
| Ba, Barium (ppm) | 41.2 | 4.3 | 38.9 | 43.4 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 0.21 | 0.04 | 0.19 | 0.24 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 0.042 | 0.010 | 0.033 | 0.052 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 2.20 | 0.33 | 2.06 | 2.34 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.59 | 0.046 | 0.56 | 0.63 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 9.73 | 0.422 | 9.36 | 10.11 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 31.4 | 2.06 | 30.3 | 32.5 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 30.0 | 2.79 | 28.5 | 31.6 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 0.71 | 0.039 | 0.69 | 0.74 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 160 | 6 | 156 | 165 | Aqua Regia Digestion |
| Dy, Dysprosium (ppm) | 2.05 | 0.28 | 1.66 | 2.43 | Aqua Regia Digestion |
| Er, Erbium (ppm) | 1.18 | 0.17 | 0.96 | 1.39 | Aqua Regia Digestion |
| Eu, Europium (ppm) | 0.45 | 0.08 | 0.34 | 0.56 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 5.71 | 0.229 | 5.53 | 5.88 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 9.78 | 0.922 | 9.20 | 10.36 | Aqua Regia Digestion |
| Gd, Gadolinium (ppm) | 1.81 | 0.18 | 1.55 | 2.06 | Aqua Regia Digestion |
| Ge, Germanium (ppm) | 0.10 | 0.03 | 0.08 | 0.13 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.41 | 0.05 | 0.36 | 0.46 | Aqua Regia Digestion |
| Ho, Holmium (ppm) | 0.39 | 0.038 | 0.32 | 0.46 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.031 | 0.002 | 0.028 | 0.033 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.151 | 0.010 | 0.144 | 0.157 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 4.38 | 0.294 | 4.21 | 4.56 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 10.3 | 0.78 | 9.8 | 10.9 | Aqua Regia Digestion |
| Lu, Lutetium (ppm) | 0.13 | 0.02 | 0.12 | 0.15 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 1.80 | 0.091 | 1.75 | 1.85 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.082 | 0.006 | 0.079 | 0.084 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 2.41 | 0.103 | 2.31 | 2.52 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.240 | 0.017 | 0.230 | 0.251 | Aqua Regia Digestion |
| Nd, Neodymium (ppm) | 5.78 | 0.441 | 5.30 | 6.25 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 68 | 3.4 | 65 | 70 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.042 | 0.002 | 0.041 | 0.044 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 25.9 | 1.24 | 25.0 | 26.8 | Aqua Regia Digestion |
| Pr, Praseodymium (ppm) | 1.23 | 0.083 | 1.11 | 1.35 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 6.33 | 0.441 | 6.05 | 6.61 | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.402 | 0.015 | 0.390 | 0.414 | Aqua Regia Digestion |
| Sb, Antimony (ppm) | 0.87 | 0.23 | 0.76 | 0.99 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 4.96 | 0.68 | 4.53 | 5.38 | Aqua Regia Digestion |
| Sm, Samarium (ppm) | 1.52 | 0.117 | 1.37 | 1.66 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 0.65 | 0.07 | 0.59 | 0.71 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 36.9 | 6.6 | 33.8 | 40.1 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Tb, Terbium (ppm) | 0.30 | 0.010 | 0.28 | 0.33 | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.10 | 0.02 | 0.08 | 0.13 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 0.80 | 0.038 | 0.75 | 0.85 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.315 | 0.064 | 0.286 | 0.343 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.12 | 0.007 | 0.11 | 0.13 | Aqua Regia Digestion |
| Tm, Thulium (ppm) | 0.16 | 0.03 | 0.10 | 0.21 | Aqua Regia Digestion |
| U, Uranium (ppm) | 0.20 | 0.016 | 0.19 | 0.22 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 127 | 18 | 119 | 136 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 23.5 | 4.0 | 21.6 | 25.4 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 10.6 | 0.54 | 10.3 | 11.0 | Aqua Regia Digestion |
| Yb, Ytterbium (ppm) | 0.97 | 0.14 | 0.81 | 1.13 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 129 | 7 | 125 | 134 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 13.9 | 2.3 | 12.7 | 15.1 | Aqua Regia Digestion |
