OREAS 284
primary
granodiorite
orogenic lode gold
OREAS 284
SKU: 284
OREAS 284 is one of a suite of six gold ore CRMs (OREAS 284 to OREAS 289)
prepared from a blend of ores and barren granodiorite. The ores were
sourced from the Loulo-Gounkoto Complex in Western Mali. The certification
program includes:
Au by 25-40g fire assay with ICP-OES or AAS finish;
Gold by Chrysos’ PhotonAssay™ (protocol PAAU02) with recommended gross
mass 470±15g (15 laboratories);
Au by aqua regia digestion (10-50g sample weight) with AAS or ICP finish;
Au by cyanide leach (5-200g sample weight) with ICP or AAS finish;
Full elemental suites by 4-acid (HCl-HNO3-HF-HClO4) digestion with ICP-OES
and MS finish, including over range analytes by ore-grade 4A digestion;
Full elemental suites by aqua regia digestion with ICP-OES and MS
analysis, including over range analytes by ore-grade AR digestion;
Total S by IR combustion furnace (Leco).
Specifications
- State: primary
- Matrix: granodiorite
- 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) | 0.404 | 0.016 | 0.399 | 0.409 | Pb Fire Assay |
| Au, Gold (ppm) | 0.411 | 0.036 | 0.403 | 0.419 | PhotonAssay |
| Au, Gold (ppm) | 0.394 | 0.019 | 0.386 | 0.402 | Aqua Regia Digestion (sample weights 10-50g) |
| Au, Gold (ppm) | 0.385 | 0.037 | 0.369 | 0.402 | Cyanide Leach |
| Ag, Silver (ppm) | 0.095 | 0.012 | 0.080 | 0.111 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 7.74 | 0.288 | 7.50 | 7.98 | 4-Acid Digestion |
| As, Arsenic (ppm) | 180 | 7 | 173 | 187 | 4-Acid Digestion |
| Ba, Barium (ppm) | 1045 | 49 | 1005 | 1084 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 2.56 | 0.179 | 2.42 | 2.70 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 0.67 | 0.10 | 0.54 | 0.80 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 1.87 | 0.081 | 1.81 | 1.93 | 4-Acid Digestion |
| Cd, Cadmium (ppm) | 0.20 | 0.02 | 0.17 | 0.23 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 79 | 4.7 | 74 | 84 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 12.3 | 0.71 | 11.6 | 13.0 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 47.7 | 3.96 | 44.2 | 51.3 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 11.4 | 0.56 | 10.8 | 12.0 | 4-Acid Digestion |
| Cu, Copper (ppm) | 27.6 | 2.32 | 25.7 | 29.5 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.94 | 0.190 | 3.66 | 4.22 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.42 | 0.083 | 1.24 | 1.60 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.48 | 0.088 | 1.31 | 1.64 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 3.15 | 0.099 | 3.05 | 3.26 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 21.0 | 1.40 | 19.8 | 22.3 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 6.19 | 0.260 | 5.54 | 6.84 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 1.93 | 0.142 | 1.76 | 2.09 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.63 | 0.039 | 0.58 | 0.68 | 4-Acid Digestion |
| In, Indium (ppm) | 0.069 | 0.004 | 0.063 | 0.075 | 4-Acid Digestion |
| K, Potassium (wt.%) | 2.93 | 0.104 | 2.83 | 3.03 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 38.0 | 1.69 | 35.7 | 40.2 | 4-Acid Digestion |
| Li, Lithium (ppm) | 53 | 3.2 | 50 | 56 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.16 | 0.02 | 0.14 | 0.18 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 0.852 | 0.034 | 0.825 | 0.880 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.038 | 0.002 | 0.036 | 0.039 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 2.58 | 0.200 | 2.29 | 2.86 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 2.04 | 0.070 | 1.98 | 2.10 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 12.9 | 0.76 | 12.3 | 13.5 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 35.6 | 2.09 | 32.7 | 38.5 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 18.9 | 0.87 | 17.8 | 19.9 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.084 | 0.003 | 0.081 | 0.087 | 4-Acid Digestion |
| Pb, Lead (ppm) | 23.6 | 1.63 | 22.4 | 24.7 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 9.28 | 0.515 | 8.30 | 10.27 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 170 | 10 | 161 | 178 | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.262 | 0.011 | 0.250 | 0.273 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 0.47 | 0.028 | 0.42 | 0.51 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 9.03 | 0.567 | 8.51 | 9.55 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 7.27 | 0.468 | 6.24 | 8.30 | 4-Acid Digestion |
| Sn, Tin (ppm) | 4.79 | 0.236 | 4.51 | 5.06 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 161 | 7 | 155 | 167 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 1.09 | 0.058 | 1.01 | 1.17 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.79 | 0.065 | 0.71 | 0.87 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.056 | 0.025 | 0.013 | 0.099 | 4-Acid Digestion |
| Th, Thorium (ppm) | 15.3 | 0.68 | 14.7 | 15.9 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.373 | 0.012 | 0.360 | 0.386 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.95 | 0.050 | 0.91 | 1.00 | 4-Acid Digestion |
| Tm, Thulium (ppm) | 0.19 | 0.014 | 0.17 | 0.21 | 4-Acid Digestion |
| U, Uranium (ppm) | 4.09 | 0.44 | 3.53 | 4.66 | 4-Acid Digestion |
| V, Vanadium (ppm) | 62 | 2.6 | 60 | 65 | 4-Acid Digestion |
| W, Tungsten (ppm) | 16.1 | 0.97 | 14.9 | 17.2 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 15.8 | 1.13 | 14.8 | 16.8 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.17 | 0.14 | 1.02 | 1.33 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 82 | 3.4 | 79 | 85 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 59 | 5.4 | 54 | 63 | 4-Acid Digestion |
| Ag, Silver (ppm) | 0.082 | 0.009 | 0.070 | 0.095 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 2.16 | 0.162 | 2.08 | 2.25 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 174 | 8 | 167 | 181 | Aqua Regia Digestion |
| Ba, Barium (ppm) | 510 | 34 | 487 | 534 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 1.66 | 0.094 | 1.55 | 1.77 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 0.69 | 0.08 | 0.53 | 0.86 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.572 | 0.033 | 0.551 | 0.593 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.084 | 0.009 | 0.068 | 0.099 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 40.4 | 4.8 | 36.5 | 44.4 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 11.9 | 0.62 | 11.3 | 12.5 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 52 | 2.4 | 50 | 55 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 9.48 | 0.292 | 9.11 | 9.85 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 27.4 | 1.59 | 26.1 | 28.7 | Aqua Regia Digestion |
| Dy, Dysprosium (ppm) | 2.81 | 0.270 | 2.40 | 3.22 | Aqua Regia Digestion |
| Er, Erbium (ppm) | 1.00 | 0.11 | 0.83 | 1.17 | Aqua Regia Digestion |
| Eu, Europium (ppm) | 0.39 | 0.08 | 0.28 | 0.49 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 3.08 | 0.160 | 2.94 | 3.22 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 9.76 | 0.588 | 9.28 | 10.24 | Aqua Regia Digestion |
| Gd, Gadolinium (ppm) | 4.05 | 0.82 | 2.90 | 5.21 | Aqua Regia Digestion |
| Ge, Germanium (ppm) | 0.12 | 0.02 | 0.09 | 0.16 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.34 | 0.04 | 0.30 | 0.38 | Aqua Regia Digestion |
| Ho, Holmium (ppm) | 0.41 | 0.032 | 0.36 | 0.45 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.066 | 0.005 | 0.056 | 0.076 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 1.02 | 0.062 | 0.98 | 1.05 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 19.2 | 3.5 | 17.2 | 21.2 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 44.4 | 1.83 | 42.6 | 46.3 | Aqua Regia Digestion |
| Lu, Lutetium (ppm) | 0.095 | 0.007 | 0.084 | 0.106 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 0.810 | 0.032 | 0.778 | 0.842 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.033 | 0.001 | 0.031 | 0.034 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 2.37 | 0.220 | 2.15 | 2.59 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.159 | 0.024 | 0.146 | 0.173 | Aqua Regia Digestion |
| Nb, Niobium (ppm) | 0.78 | 0.26 | 0.59 | 0.97 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 18.7 | 0.79 | 17.8 | 19.5 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.064 | 0.003 | 0.062 | 0.066 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 4.79 | 0.50 | 4.41 | 5.17 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 105 | 6 | 100 | 110 | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.255 | 0.017 | 0.240 | 0.270 | Aqua Regia Digestion |
| Sb, Antimony (ppm) | 0.25 | 0.04 | 0.22 | 0.27 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 8.16 | 0.233 | 7.88 | 8.44 | Aqua Regia Digestion |
| Se, Selenium (ppm) | 0.40 | 0.12 | 0.15 | 0.65 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 3.54 | 0.199 | 3.35 | 3.74 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 19.3 | 2.4 | 17.9 | 20.7 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Tb, Terbium (ppm) | 0.57 | 0.051 | 0.51 | 0.64 | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.049 | 0.014 | 0.028 | 0.070 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 8.52 | 1.63 | 7.56 | 9.47 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.273 | 0.023 | 0.259 | 0.286 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.68 | 0.029 | 0.65 | 0.71 | Aqua Regia Digestion |
| U, Uranium (ppm) | 3.47 | 0.283 | 2.99 | 3.95 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 61 | 2.4 | 59 | 63 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 10.1 | 1.4 | 9.3 | 11.0 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 10.8 | 0.58 | 10.3 | 11.4 | Aqua Regia Digestion |
| Yb, Ytterbium (ppm) | 0.71 | 0.017 | 0.68 | 0.73 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 77 | 4.2 | 74 | 80 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 8.27 | 0.681 | 7.75 | 8.79 | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.257 | 0.015 | 0.246 | 0.268 | Infrared Combustion |
Product Specifications
State
primary
Matrix
granodiorite
Mineralisation
orogenic lode gold
Availability
available
Certified Reference Values
| Analyte | Certified Value | Uncertainty (1SD) | 95% Confidence Low | 95% Confidence High | Method |
|---|---|---|---|---|---|
| Ce - Cerium (ppm) | 79 | - | - | - | 4-Acid Digestion |
| Dy - Dysprosium (ppm) | 3.94 | - | - | - | 4-Acid Digestion |
| Er - Erbium (ppm) | 1.42 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.48 | - | - | - | 4-Acid Digestion |
| Gd - Gadolinium (ppm) | 6.19 | - | - | - | 4-Acid Digestion |
| Ho - Holmium (ppm) | 0.63 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 38.0 | - | - | - | 4-Acid Digestion |
| Lu - Lutetium (ppm) | 0.16 | - | - | - | 4-Acid Digestion |
| Nd - Neodymium (ppm) | 35.6 | - | - | - | 4-Acid Digestion |
| Pr - Praseodymium (ppm) | 9.28 | - | - | - | 4-Acid Digestion |
| Sm - Samarium (ppm) | 7.27 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.79 | - | - | - | 4-Acid Digestion |
| Tm - Thulium (ppm) | 0.19 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 15.8 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.17 | - | - | - | 4-Acid Digestion |
| Ag - Silver (ppm) | 0.082 | - | - | - | Aqua Regia |
| As - Arsenic (ppm) | 174 | - | - | - | Aqua Regia |
| Bi - Bismuth (ppm) | 0.69 | - | - | - | Aqua Regia |
| Cd - Cadmium (ppm) | 0.084 | - | - | - | Aqua Regia |
| Co - Cobalt (ppm) | 11.9 | - | - | - | Aqua Regia |
| Cu - Copper (ppm) | 27.4 | - | - | - | Aqua Regia |
| Mo - Molybdenum (ppm) | 2.37 | - | - | - | Aqua Regia |
| Sb - Antimony (ppm) | 0.25 | - | - | - | Aqua Regia |
| Se - Selenium (ppm) | 0.40 | - | - | - | Aqua Regia |
| Te - Tellurium (ppm) | 0.049 | - | - | - | Aqua Regia |
| Tl - Thallium (ppm) | 0.68 | - | - | - | Aqua Regia |
| Zn - Zinc (ppm) | 77 | - | - | - | 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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