OREAS 237b
primary
metasediments
orogenic lode gold
OREAS 237b
SKU: 237b
OREAS 237b was prepared from a blend of high-grade, gold-bearing ore and
barren metasediments. The ore was sourced from the Fosterville Mine, located
20km from the city of Bendigo in the state of Victoria, Australia. The deposit
is hosted by a metamorphosed interbedded turbidite sequence of sandstones,
siltstones and shales. Primary gold mineralization occurs as disseminated
arsenopyrite and pyrite in a quartz–carbonate veinlet stockwork. Primary gold
also occurs as visible gold where it variably overprints sulphide mineralization
and is found as disseminated fine specks (>1 mm) of gold within host quartz
veins. The visible gold is spatially associated with antimony mineralization, in
the form of stibnite that occurs with quartz and varies from replacement and
infill of earlier quartz-carbonate stockwork veins, to massive stibnite-only
veins of up to 0.5m in width (Hitchman, Philips, & Greenberger, 2017).
Thirty-five commercial analytical laboratories participated in the program to
certify the elements shown below. The following methods were employed:
Gold by fire assay
Gold by aqua regia digestion (15-50g sample weight)
Gold by cyanide leach
Gold by X-ray PhotonAssay with recommended gross mass 470-500g
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 of Au on 20 x 85mg subsamples to
confirm homogeneity (undertaken at ANSTO)
Specifications
- State: primary
- Matrix: metasediments
- 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) | 2.26 | 0.067 | 2.24 | 2.29 | Pb Fire Assay |
| Au, Gold (ppm) | 2.20 | 0.078 | 2.16 | 2.23 | Aqua Regia Digestion (sample weights 10-50g) |
| Au, Gold (ppm) | 1.98 | 0.104 | 1.93 | 2.03 | Cyanide Leach |
| Au, Gold (ppm) | 2.30 | 0.076 | 2.26 | 2.34 | PhotonAssay |
| Ag, Silver (ppm) | 0.183 | 0.035 | 0.152 | 0.214 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 7.32 | 0.231 | 7.12 | 7.52 | 4-Acid Digestion |
| As, Arsenic (ppm) | 591 | 34 | 566 | 616 | 4-Acid Digestion |
| Ba, Barium (ppm) | 683 | 19 | 664 | 702 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 2.47 | 0.188 | 2.35 | 2.58 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 0.35 | 0.030 | 0.32 | 0.39 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 0.903 | 0.029 | 0.877 | 0.930 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 81 | 3.4 | 77 | 84 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 17.3 | 0.52 | 16.8 | 17.8 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 123 | 15 | 115 | 131 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 9.42 | 0.337 | 9.05 | 9.79 | 4-Acid Digestion |
| Cu, Copper (ppm) | 28.3 | 1.53 | 27.1 | 29.5 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.60 | 0.70 | 3.07 | 4.13 | 4-Acid Digestion |
| Er, Erbium (ppm) | 2.00 | 0.48 | 1.51 | 2.48 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.25 | 0.079 | 1.15 | 1.34 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 4.05 | 0.072 | 3.94 | 4.15 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 19.4 | 1.20 | 18.4 | 20.4 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 5.06 | 0.321 | 4.75 | 5.38 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 3.94 | 0.215 | 3.68 | 4.19 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.68 | 0.17 | 0.52 | 0.85 | 4-Acid Digestion |
| In, Indium (ppm) | 0.066 | 0.007 | 0.058 | 0.074 | 4-Acid Digestion |
| K, Potassium (wt.%) | 2.65 | 0.075 | 2.57 | 2.72 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 38.6 | 2.03 | 37.0 | 40.3 | 4-Acid Digestion |
| Li, Lithium (ppm) | 52 | 3.7 | 50 | 55 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.28 | 0.07 | 0.22 | 0.33 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 1.70 | 0.051 | 1.65 | 1.74 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.041 | 0.002 | 0.040 | 0.042 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 0.97 | 0.069 | 0.90 | 1.04 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 0.756 | 0.018 | 0.736 | 0.776 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 13.6 | 1.4 | 12.8 | 14.4 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 34.2 | 1.30 | 33.0 | 35.4 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 64 | 3.1 | 62 | 66 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.066 | 0.002 | 0.064 | 0.068 | 4-Acid Digestion |
| Pb, Lead (ppm) | 20.0 | 0.74 | 19.0 | 21.0 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 9.29 | 0.461 | 8.92 | 9.66 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 155 | 11 | 147 | 163 | 4-Acid Digestion |
| Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.193 | 0.010 | 0.183 | 0.203 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 460 | 26 | 442 | 478 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 14.2 | 0.76 | 13.4 | 14.9 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 6.61 | 0.413 | 6.19 | 7.02 | 4-Acid Digestion |
| Sn, Tin (ppm) | 3.61 | 0.230 | 3.40 | 3.82 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 123 | 4 | 120 | 126 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 1.03 | 0.099 | 0.95 | 1.11 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.66 | 0.044 | 0.61 | 0.71 | 4-Acid Digestion |
| Th, Thorium (ppm) | 14.5 | 0.66 | 13.8 | 15.1 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.456 | 0.017 | 0.443 | 0.469 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.84 | 0.056 | 0.79 | 0.90 | 4-Acid Digestion |
| Tm, Thulium (ppm) | 0.25 | 0.04 | 0.22 | 0.29 | 4-Acid Digestion |
| U, Uranium (ppm) | 2.73 | 0.116 | 2.59 | 2.88 | 4-Acid Digestion |
| V, Vanadium (ppm) | 104 | 3 | 102 | 107 | 4-Acid Digestion |
| W, Tungsten (ppm) | 2.44 | 0.29 | 2.22 | 2.66 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 16.2 | 2.2 | 14.9 | 17.5 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.76 | 0.29 | 1.55 | 1.97 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 95 | 3.6 | 92 | 98 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 135 | 7 | 130 | 139 | 4-Acid Digestion |
| Ag, Silver (ppm) | 0.176 | 0.015 | 0.163 | 0.189 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 2.75 | 0.153 | 2.64 | 2.85 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 583 | 29 | 567 | 600 | Aqua Regia Digestion |
| Ba, Barium (ppm) | 108 | 8 | 103 | 113 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 1.26 | 0.098 | 1.17 | 1.35 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 0.33 | 0.019 | 0.31 | 0.36 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.312 | 0.020 | 0.300 | 0.325 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.043 | 0.014 | 0.032 | 0.054 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 54 | 2.6 | 51 | 58 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 15.7 | 0.83 | 15.1 | 16.3 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 108 | 5 | 105 | 111 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 6.93 | 0.289 | 6.72 | 7.15 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 26.9 | 1.37 | 25.7 | 28.1 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 3.43 | 0.121 | 3.35 | 3.52 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 8.88 | 0.393 | 8.49 | 9.27 | Aqua Regia Digestion |
| Ge, Germanium (ppm) | 0.11 | 0.02 | 0.08 | 0.14 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.49 | 0.08 | 0.43 | 0.54 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.033 | 0.005 | 0.030 | 0.037 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.866 | 0.041 | 0.838 | 0.895 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 27.5 | 3.4 | 25.5 | 29.5 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 43.0 | 3.10 | 41.0 | 45.0 | Aqua Regia Digestion |
| Lu, Lutetium (ppm) | 0.12 | 0.02 | 0.09 | 0.15 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 1.37 | 0.078 | 1.32 | 1.42 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.028 | 0.001 | 0.027 | 0.029 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 0.88 | 0.045 | 0.80 | 0.95 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.082 | 0.008 | 0.076 | 0.088 | Aqua Regia Digestion |
| Nb, Niobium (ppm) | 0.39 | 0.11 | 0.30 | 0.47 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 60 | 3.3 | 58 | 62 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.058 | 0.002 | 0.056 | 0.060 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 9.97 | 0.926 | 9.34 | 10.59 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 85 | 3.0 | 82 | 88 | Aqua Regia Digestion |
| Re, Rhenium (ppm) | < 0.001 | IND | IND | IND | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.192 | 0.018 | 0.181 | 0.202 | Aqua Regia Digestion |
| Sb, Antimony (ppm) | 343 | 58 | 312 | 374 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 7.29 | 0.572 | 6.92 | 7.67 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 1.67 | 0.074 | 1.58 | 1.75 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 26.2 | 1.11 | 25.0 | 27.3 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.050 | IND | IND | IND | Aqua Regia Digestion |
| Th, Thorium (ppm) | 12.3 | 0.63 | 11.7 | 12.8 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.150 | 0.015 | 0.141 | 0.159 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.50 | 0.038 | 0.48 | 0.53 | Aqua Regia Digestion |
| U, Uranium (ppm) | 1.46 | 0.117 | 1.37 | 1.54 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 69 | 3.0 | 67 | 71 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 0.49 | 0.07 | 0.43 | 0.56 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 9.23 | 0.633 | 8.79 | 9.68 | Aqua Regia Digestion |
| Yb, Ytterbium (ppm) | 0.84 | 0.09 | 0.71 | 0.98 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 85 | 3.2 | 82 | 88 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 19.1 | 3.7 | 17.0 | 21.2 | Aqua Regia Digestion |
Product Specifications
State
primary
Matrix
metasediments
Mineralisation
orogenic lode gold
Availability
available
Certified Reference Values
| Analyte | Certified Value | Uncertainty (1SD) | 95% Confidence Low | 95% Confidence High | Method |
|---|---|---|---|---|---|
| Ce - Cerium (ppm) | 81 | - | - | - | 4-Acid Digestion |
| Dy - Dysprosium (ppm) | 3.60 | - | - | - | 4-Acid Digestion |
| Er - Erbium (ppm) | 2.00 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.25 | - | - | - | 4-Acid Digestion |
| Gd - Gadolinium (ppm) | 5.06 | - | - | - | 4-Acid Digestion |
| Ho - Holmium (ppm) | 0.68 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 38.6 | - | - | - | 4-Acid Digestion |
| Lu - Lutetium (ppm) | 0.28 | - | - | - | 4-Acid Digestion |
| Nd - Neodymium (ppm) | 34.2 | - | - | - | 4-Acid Digestion |
| Pr - Praseodymium (ppm) | 9.29 | - | - | - | 4-Acid Digestion |
| Sm - Samarium (ppm) | 6.61 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.66 | - | - | - | 4-Acid Digestion |
| Tm - Thulium (ppm) | 0.25 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 16.2 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.76 | - | - | - | 4-Acid Digestion |
| Ag - Silver (ppm) | 0.176 | - | - | - | Aqua Regia |
| As - Arsenic (ppm) | 583 | - | - | - | Aqua Regia |
| Bi - Bismuth (ppm) | 0.33 | - | - | - | Aqua Regia |
| Cd - Cadmium (ppm) | 0.043 | - | - | - | Aqua Regia |
| Co - Cobalt (ppm) | 15.7 | - | - | - | Aqua Regia |
| Cu - Copper (ppm) | 26.9 | - | - | - | Aqua Regia |
| Ni - Nickel (ppm) | 60 | - | - | - | Aqua Regia |
| Pb - Lead (ppm) | 9.97 | - | - | - | 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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