OREAS 152c
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Description
Description
OREAS 152c is a porphyry Cu-Au certified reference material prepared from a blend of ores, barren granodiorite and minor additions of copper and molybdenum concentrates. The ores were predominantly sourced from the Waisoi district, Viti Levu, Fiji and this was blended with lesser quantities of other porphyry ores from Chile and Australia. Copper mineralisation in the Namosi district is accompanied by stockwork quartz veinlets and is characterised by bornite-chalcopyrite-pyrite assemblages formed under a high sulphidation environment. The barren granodiorite was sourced from the mafic, S-Type, Late Devonian Bulla Granodiorite complex located in northern Melbourne, Australia. Thirty-one commercial analytical laboratories participated in the program to certify the elements reported below.
- Gold by fire assay (15-50g charge weight) with ICP-OES, ICP-MS or AAS finish
- Gold by aqua regia digestion (10-50g sample weight) with ICP-OES, ICP-MS 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
Instrumental neutron activation analysis for Au on 20 x 85mg subsamples was also undertaken at ANSTO, Lucas Heights to confirm homogeneity.
|
Analyte
|
Certified Value
|
1SD
|
Expanded Uncertainty Low
|
Expanded Uncertainty High
|
Method
|
|---|---|---|---|---|---|
| Cu, Copper (wt.%) | 0.378 | 0.012 | 0.367 | 0.389 | 4-Acid Digestion |
| Au, Gold (ppb) | 134 | 5.8 | 132 | 136 | Pb Fire Assay |
| Mo, Molybdenum (ppm) | 93 | 3.9 | 89 | 97 | 4-Acid Digestion |
| Au, Gold (ppb) | 134 | 5.4 | 132 | 136 | Aqua Regia Digestion (sample weights 10-50g) |
| Ag, Silver (ppm) | 0.910 | 0.072 | 0.853 | 0.967 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 7.64 | 0.375 | 7.28 | 8.01 | 4-Acid Digestion |
| As, Arsenic (ppm) | 22.5 | 1.75 | 21.0 | 23.9 | 4-Acid Digestion |
| Ba, Barium (ppm) | 870 | 36 | 838 | 902 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 2.14 | 0.142 | 2.03 | 2.24 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 1.59 | 0.140 | 1.35 | 1.82 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 1.55 | 0.080 | 1.48 | 1.61 | 4-Acid Digestion |
| Cd, Cadmium (ppm) | 0.65 | 0.042 | 0.60 | 0.70 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 63 | 5.0 | 58 | 68 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 11.2 | 0.43 | 10.7 | 11.7 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 41.3 | 4.7 | 38.4 | 44.2 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 9.32 | 0.532 | 8.82 | 9.82 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.05 | 0.179 | 2.81 | 3.28 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.25 | 0.108 | 1.12 | 1.39 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.25 | 0.13 | 1.10 | 1.40 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 2.96 | 0.117 | 2.86 | 3.06 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 20.5 | 1.03 | 19.4 | 21.5 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 4.91 | 0.444 | 4.45 | 5.37 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 1.63 | 0.143 | 1.49 | 1.76 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.50 | 0.011 | 0.48 | 0.53 | 4-Acid Digestion |
| In, Indium (ppm) | 0.33 | 0.018 | 0.31 | 0.35 | 4-Acid Digestion |
| K, Potassium (wt.%) | 2.59 | 0.053 | 2.52 | 2.66 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 30.6 | 2.47 | 28.6 | 32.6 | 4-Acid Digestion |
| Li, Lithium (ppm) | 43.5 | 2.02 | 41.7 | 45.2 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.15 | 0.02 | 0.12 | 0.18 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 0.755 | 0.030 | 0.731 | 0.779 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.032 | 0.001 | 0.031 | 0.033 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 2.20 | 0.057 | 2.13 | 2.26 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 10.6 | 0.65 | 10.0 | 11.3 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 27.5 | 1.53 | 24.7 | 30.2 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 16.8 | 0.62 | 16.0 | 17.6 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.076 | 0.002 | 0.074 | 0.079 | 4-Acid Digestion |
| Pb, Lead (ppm) | 61 | 3.6 | 59 | 64 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 7.07 | 0.350 | 6.43 | 7.71 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 144 | 10 | 137 | 152 | 4-Acid Digestion |
| Re, Rhenium (ppm) | 0.055 | 0.004 | 0.049 | 0.061 | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.618 | 0.028 | 0.595 | 0.640 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 1.45 | 0.088 | 1.36 | 1.54 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 8.17 | 0.469 | 7.76 | 8.58 | 4-Acid Digestion |
| Se, Selenium (ppm) | 4.63 | 0.57 | 3.80 | 5.46 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 5.82 | 0.463 | 5.18 | 6.46 | 4-Acid Digestion |
| Sn, Tin (ppm) | 4.56 | 0.414 | 4.29 | 4.84 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 196 | 12 | 188 | 204 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 0.93 | 0.031 | 0.88 | 0.97 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.64 | 0.07 | 0.55 | 0.73 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.61 | 0.06 | 0.53 | 0.69 | 4-Acid Digestion |
| Th, Thorium (ppm) | 11.7 | 0.91 | 10.8 | 12.6 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.323 | 0.013 | 0.312 | 0.333 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.81 | 0.043 | 0.77 | 0.86 | 4-Acid Digestion |
| Tm, Thulium (ppm) | 0.16 | 0.02 | 0.13 | 0.19 | 4-Acid Digestion |
| U, Uranium (ppm) | 3.20 | 0.319 | 2.75 | 3.65 | 4-Acid Digestion |
| V, Vanadium (ppm) | 74 | 2.2 | 72 | 77 | 4-Acid Digestion |
| W, Tungsten (ppm) | 9.36 | 1.05 | 8.41 | 10.31 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 13.7 | 1.20 | 12.8 | 14.7 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 0.99 | 0.10 | 0.85 | 1.14 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 229 | 4 | 223 | 234 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 53 | 3.6 | 50 | 56 | 4-Acid Digestion |
| Ag, Silver (ppm) | 0.899 | 0.053 | 0.860 | 0.939 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 1.94 | 0.097 | 1.87 | 2.01 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 21.5 | 1.05 | 20.3 | 22.6 | Aqua Regia Digestion |
| B, Boron (ppm) | < 10.0 | IND | IND | IND | Aqua Regia Digestion |
| Ba, Barium (ppm) | 406 | 25 | 388 | 423 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 1.43 | 0.132 | 1.34 | 1.53 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 1.64 | 0.133 | 1.46 | 1.82 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.418 | 0.026 | 0.401 | 0.436 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.57 | 0.06 | 0.52 | 0.62 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 30.9 | 2.70 | 28.8 | 33.0 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 11.1 | 0.83 | 10.4 | 11.7 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 47.3 | 2.22 | 45.8 | 48.8 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 7.76 | 0.551 | 7.37 | 8.16 | Aqua Regia Digestion |
| Cu, Copper (wt.%) | 0.376 | 0.010 | 0.368 | 0.385 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 2.89 | 0.113 | 2.82 | 2.96 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 9.00 | 0.672 | 8.50 | 9.51 | Aqua Regia Digestion |
| Ge, Germanium (ppm) | 0.10 | 0.02 | 0.08 | 0.13 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.27 | 0.03 | 0.25 | 0.30 | Aqua Regia Digestion |
| Hg, Mercury (ppm) | 0.032 | 0.010 | 0.018 | 0.046 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.32 | 0.015 | 0.31 | 0.34 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.863 | 0.042 | 0.836 | 0.890 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 14.4 | 1.14 | 13.5 | 15.3 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 36.0 | 2.03 | 34.6 | 37.3 | Aqua Regia Digestion |
| Lu, Lutetium (ppm) | 0.090 | 0.012 | 0.074 | 0.105 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 0.697 | 0.030 | 0.677 | 0.718 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.027 | 0.001 | 0.027 | 0.028 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 90 | 4.4 | 86 | 93 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.156 | 0.018 | 0.144 | 0.168 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 15.9 | 0.84 | 15.3 | 16.6 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.058 | 0.003 | 0.056 | 0.060 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 43.8 | 2.64 | 41.9 | 45.6 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 84 | 3.2 | 80 | 88 | Aqua Regia Digestion |
| Re, Rhenium (ppm) | 0.056 | 0.003 | 0.053 | 0.059 | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.607 | 0.020 | 0.587 | 0.627 | Aqua Regia Digestion |
| Sb, Antimony (ppm) | 0.99 | 0.15 | 0.90 | 1.09 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 7.25 | 0.411 | 6.84 | 7.67 | Aqua Regia Digestion |
| Se, Selenium (ppm) | 4.54 | 0.368 | 4.20 | 4.88 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 3.25 | 0.269 | 3.05 | 3.45 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 32.1 | 1.97 | 30.9 | 33.4 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Tb, Terbium (ppm) | 0.47 | 0.06 | 0.38 | 0.55 | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.60 | 0.041 | 0.54 | 0.65 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 6.02 | 0.69 | 5.52 | 6.53 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.222 | 0.011 | 0.213 | 0.232 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.55 | 0.045 | 0.51 | 0.58 | Aqua Regia Digestion |
| U, Uranium (ppm) | 2.80 | 0.228 | 2.45 | 3.15 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 61 | 2.0 | 59 | 63 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 5.82 | 0.98 | 5.14 | 6.50 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 9.83 | 0.534 | 9.31 | 10.34 | Aqua Regia Digestion |
| Yb, Ytterbium (ppm) | 0.69 | 0.031 | 0.64 | 0.74 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 222 | 6 | 217 | 227 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 6.89 | 0.605 | 6.40 | 7.39 | Aqua Regia Digestion |
