OREAS 286
primary
granodiorite
orogenic lode gold
OREAS 286
SKU: 286
OREAS 286 is one of a suite of six gold ore CRMs (OREAS 284 to OREAS 289)
prepared from a blend of Gounkoto ore and barren granodiorite. The ore was
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 455±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 >1 ppm, Au only
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL High | Method |
|---|---|---|---|---|---|
| Au, Gold (ppm) | 1.40 | 0.043 | 1.39 | 1.42 | Pb Fire Assay |
| Au, Gold (ppm) | 1.43 | 0.058 | 1.42 | 1.45 | PhotonAssay |
| Au, Gold (ppm) | 1.37 | 0.087 | 1.33 | 1.40 | Aqua Regia Digestion (sample weights 10-50g) |
| Au, Gold (ppm) | 1.37 | 0.065 | 1.34 | 1.40 | Cyanide Leach |
| Ag, Silver (ppm) | 0.095 | 0.012 | 0.078 | 0.112 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 7.63 | 0.293 | 7.37 | 7.90 | 4-Acid Digestion |
| As, Arsenic (ppm) | 549 | 22 | 529 | 568 | 4-Acid Digestion |
| Ba, Barium (ppm) | 993 | 43 | 955 | 1032 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 2.42 | 0.176 | 2.28 | 2.55 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 0.62 | 0.08 | 0.49 | 0.75 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 2.06 | 0.074 | 2.00 | 2.12 | 4-Acid Digestion |
| Cd, Cadmium (ppm) | 0.20 | 0.02 | 0.16 | 0.23 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 75 | 4.8 | 70 | 80 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 15.1 | 0.69 | 14.5 | 15.7 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 50 | 2.9 | 48 | 53 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 10.5 | 0.50 | 10.0 | 11.0 | 4-Acid Digestion |
| Cu, Copper (ppm) | 38.7 | 1.96 | 37.2 | 40.1 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.86 | 0.156 | 3.65 | 4.08 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.45 | 0.142 | 1.24 | 1.65 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.45 | 0.049 | 1.35 | 1.55 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 3.64 | 0.127 | 3.53 | 3.75 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 20.7 | 1.38 | 19.8 | 21.7 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 5.97 | 0.337 | 5.55 | 6.40 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 1.87 | 0.139 | 1.72 | 2.02 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.62 | 0.08 | 0.50 | 0.73 | 4-Acid Digestion |
| In, Indium (ppm) | 0.074 | 0.006 | 0.065 | 0.083 | 4-Acid Digestion |
| K, Potassium (wt.%) | 2.96 | 0.102 | 2.88 | 3.04 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 36.4 | 1.78 | 34.0 | 38.8 | 4-Acid Digestion |
| Li, Lithium (ppm) | 52 | 2.7 | 50 | 54 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.17 | 0.016 | 0.15 | 0.18 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 1.12 | 0.029 | 1.09 | 1.15 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.040 | 0.001 | 0.039 | 0.041 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 2.74 | 0.199 | 2.44 | 3.03 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 1.94 | 0.062 | 1.88 | 1.99 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 12.4 | 0.72 | 11.8 | 13.0 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 34.5 | 1.83 | 31.6 | 37.5 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 21.2 | 0.94 | 20.3 | 22.0 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.083 | 0.003 | 0.080 | 0.086 | 4-Acid Digestion |
| Pb, Lead (ppm) | 21.9 | 1.49 | 20.7 | 23.1 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 9.00 | 0.456 | 8.16 | 9.84 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 160 | 10 | 152 | 168 | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.544 | 0.027 | 0.522 | 0.567 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 0.50 | 0.030 | 0.45 | 0.56 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 9.10 | 0.601 | 8.62 | 9.57 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 6.97 | 0.285 | 6.28 | 7.66 | 4-Acid Digestion |
| Sn, Tin (ppm) | 4.44 | 0.249 | 4.17 | 4.71 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 152 | 6 | 148 | 157 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 1.02 | 0.073 | 0.97 | 1.07 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.76 | 0.027 | 0.72 | 0.81 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.087 | 0.022 | 0.051 | 0.124 | 4-Acid Digestion |
| Th, Thorium (ppm) | 14.5 | 0.78 | 13.5 | 15.5 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.361 | 0.013 | 0.349 | 0.374 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.90 | 0.044 | 0.85 | 0.94 | 4-Acid Digestion |
| Tm, Thulium (ppm) | 0.19 | 0.010 | 0.17 | 0.21 | 4-Acid Digestion |
| U, Uranium (ppm) | 4.07 | 0.43 | 3.43 | 4.72 | 4-Acid Digestion |
| V, Vanadium (ppm) | 66 | 2.7 | 64 | 68 | 4-Acid Digestion |
| W, Tungsten (ppm) | 12.8 | 0.77 | 11.7 | 13.9 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 15.9 | 0.99 | 15.0 | 16.7 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.16 | 0.072 | 1.07 | 1.26 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 76 | 3.0 | 74 | 78 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 59 | 4.3 | 55 | 63 | 4-Acid Digestion |
| Ag, Silver (ppm) | 0.088 | 0.010 | 0.073 | 0.103 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 2.19 | 0.133 | 2.10 | 2.28 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 533 | 23 | 517 | 550 | Aqua Regia Digestion |
| Ba, Barium (ppm) | 477 | 34 | 456 | 498 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 1.55 | 0.153 | 1.44 | 1.66 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 0.61 | 0.07 | 0.51 | 0.71 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.856 | 0.071 | 0.821 | 0.892 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.076 | 0.012 | 0.057 | 0.095 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 35.1 | 4.3 | 31.2 | 39.1 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 14.8 | 0.75 | 14.0 | 15.6 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 53 | 2.4 | 51 | 55 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 8.73 | 0.363 | 8.41 | 9.06 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 39.5 | 2.57 | 37.5 | 41.5 | Aqua Regia Digestion |
| Dy, Dysprosium (ppm) | 2.64 | 0.246 | 2.27 | 3.01 | Aqua Regia Digestion |
| Er, Erbium (ppm) | 0.96 | 0.10 | 0.80 | 1.11 | Aqua Regia Digestion |
| Eu, Europium (ppm) | 0.39 | 0.08 | 0.27 | 0.50 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 3.56 | 0.193 | 3.43 | 3.68 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 9.72 | 0.603 | 9.22 | 10.23 | Aqua Regia Digestion |
| Gd, Gadolinium (ppm) | 3.70 | 0.73 | 2.66 | 4.75 | Aqua Regia Digestion |
| Ge, Germanium (ppm) | 0.10 | 0.01 | 0.08 | 0.13 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.32 | 0.04 | 0.28 | 0.36 | Aqua Regia Digestion |
| Ho, Holmium (ppm) | 0.39 | 0.031 | 0.34 | 0.44 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.066 | 0.005 | 0.058 | 0.074 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.984 | 0.064 | 0.947 | 1.021 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 16.6 | 3.0 | 14.6 | 18.6 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 43.1 | 1.96 | 41.5 | 44.8 | Aqua Regia Digestion |
| Lu, Lutetium (ppm) | 0.093 | 0.006 | 0.084 | 0.103 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 1.09 | 0.039 | 1.05 | 1.12 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.036 | 0.002 | 0.035 | 0.037 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 2.49 | 0.27 | 2.26 | 2.71 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.150 | 0.020 | 0.137 | 0.162 | Aqua Regia Digestion |
| Nb, Niobium (ppm) | 0.91 | 0.31 | 0.69 | 1.14 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 20.6 | 1.12 | 19.6 | 21.5 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.064 | 0.002 | 0.062 | 0.066 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 4.55 | 0.54 | 4.12 | 4.98 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 99 | 7.4 | 94 | 105 | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.535 | 0.024 | 0.517 | 0.553 | Aqua Regia Digestion |
| Sb, Antimony (ppm) | 0.24 | 0.04 | 0.21 | 0.27 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 8.08 | 0.282 | 7.72 | 8.44 | Aqua Regia Digestion |
| Se, Selenium (ppm) | 0.49 | 0.11 | 0.25 | 0.74 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 3.21 | 0.265 | 2.99 | 3.44 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 18.8 | 2.2 | 17.3 | 20.2 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Tb, Terbium (ppm) | 0.54 | 0.039 | 0.48 | 0.59 | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.082 | 0.018 | 0.051 | 0.114 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 7.12 | 1.25 | 6.26 | 7.98 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.258 | 0.022 | 0.246 | 0.270 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.62 | 0.024 | 0.59 | 0.66 | Aqua Regia Digestion |
| U, Uranium (ppm) | 3.37 | 0.257 | 3.01 | 3.73 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 61 | 2.2 | 59 | 63 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 6.86 | 1.24 | 6.07 | 7.65 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 10.4 | 0.67 | 9.8 | 11.0 | Aqua Regia Digestion |
| Yb, Ytterbium (ppm) | 0.71 | 0.020 | 0.67 | 0.74 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 72 | 3.9 | 69 | 75 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 8.11 | 0.763 | 7.43 | 8.79 | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.537 | 0.023 | 0.522 | 0.553 | 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) | 75 | - | - | - | 4-Acid Digestion |
| Dy - Dysprosium (ppm) | 3.86 | - | - | - | 4-Acid Digestion |
| Er - Erbium (ppm) | 1.45 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.45 | - | - | - | 4-Acid Digestion |
| Gd - Gadolinium (ppm) | 5.97 | - | - | - | 4-Acid Digestion |
| Ho - Holmium (ppm) | 0.62 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 36.4 | - | - | - | 4-Acid Digestion |
| Lu - Lutetium (ppm) | 0.17 | - | - | - | 4-Acid Digestion |
| Nd - Neodymium (ppm) | 34.5 | - | - | - | 4-Acid Digestion |
| Pr - Praseodymium (ppm) | 9.00 | - | - | - | 4-Acid Digestion |
| Sm - Samarium (ppm) | 6.97 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.76 | - | - | - | 4-Acid Digestion |
| Tm - Thulium (ppm) | 0.19 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 15.9 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.16 | - | - | - | 4-Acid Digestion |
| Ag - Silver (ppm) | 0.088 | - | - | - | Aqua Regia |
| As - Arsenic (ppm) | 533 | - | - | - | Aqua Regia |
| Bi - Bismuth (ppm) | 0.61 | - | - | - | Aqua Regia |
| Cd - Cadmium (ppm) | 0.076 | - | - | - | Aqua Regia |
| Co - Cobalt (ppm) | 14.8 | - | - | - | Aqua Regia |
| Cu - Copper (ppm) | 39.5 | - | - | - | Aqua Regia |
| Mo - Molybdenum (ppm) | 2.49 | - | - | - | Aqua Regia |
| Sb - Antimony (ppm) | 0.24 | - | - | - | Aqua Regia |
| Se - Selenium (ppm) | 0.49 | - | - | - | Aqua Regia |
| Te - Tellurium (ppm) | 0.082 | - | - | - | 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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