OREAS 290b
primary
metasediments
orogenic lode gold
OREAS 290b
SKU: 290b
OREAS 290b was prepared from a blend of high-grade gold-antimony ore and
barren metasediments. The ore was sourced from the Costerfield Operation
(Mandalay Resources Ltd), located ~10 km northeast of Heathcote, Victoria. The
deposit is hosted in Lower Silurian metasedimentary rocks and is characterised
by narrow, high-grade quartz-stibnite veins. Gold occurs with arsenopyrite and
pyrite, as well as in “gold-only” quartz-carbonate veins at depth or beneath
stibnite lodes.
Forty commercial analytical laboratories participated in the program to
certify the elements reported below using the following methods:
Gold by fire assay with AAS, ICP-OES or ICP-MS finish
Gold by PhotonAssay™ with a recommended gross fill mass of 450-480 g
Gold by 15-50g aqua regia digestion with ICP-MS and AAS finish
Antimony by peroxide fusion with ICP-OES and/or ICP-MS finish
Antimony by borate fusion with XRF 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
To confirm homogeneity, gold by instrumental neutron activation analysis
(INAA) was undertaken on 20 x 85mg. This format enabled a nested ANOVA treatment
of the INAA results to compare within- and between-unit variances, providing a
statistical measure of batch homogeneity.
Specifications
- State: primary
- Matrix: metasediments
- Mineralisation: orogenic lode gold
- CRM Group: Au >1 ppm, Au-Sb ore
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL High | Method |
|---|---|---|---|---|---|
| Au, Gold (ppm) | 2.23 | 0.090 | 2.19 | 2.26 | Pb Fire Assay |
| Au, Gold (ppm) | 2.21 | 0.055 | 2.18 | 2.24 | Bi Fire Assay |
| Au, Gold (ppm) | 2.27 | 0.067 | 2.24 | 2.30 | PhotonAssay |
| Au, Gold (ppm) | 2.08 | 0.118 | 2.02 | 2.14 | Aqua Regia Digestion (sample weights 10-50g) |
| Sb, Antimony (wt.%) | 0.830 | 0.035 | 0.799 | 0.862 | Peroxide Fusion ICP |
| Sb, Antimony (wt.%) | 0.856 | 0.017 | 0.834 | 0.878 | Borate Fusion XRF |
| Ag, Silver (ppm) | 0.239 | 0.041 | 0.203 | 0.275 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 7.47 | 0.212 | 7.26 | 7.69 | 4-Acid Digestion |
| As, Arsenic (ppm) | 287 | 9 | 277 | 296 | 4-Acid Digestion |
| Ba, Barium (ppm) | 735 | 18 | 711 | 758 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 2.42 | 0.091 | 2.33 | 2.51 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 0.39 | 0.028 | 0.36 | 0.42 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 0.444 | 0.009 | 0.430 | 0.458 | 4-Acid Digestion |
| Cd, Cadmium (ppm) | 0.062 | 0.018 | 0.041 | 0.083 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 82 | 4.3 | 77 | 87 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 15.2 | 0.36 | 14.6 | 15.8 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 126 | 4 | 122 | 130 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 11.3 | 0.38 | 10.7 | 11.9 | 4-Acid Digestion |
| Cu, Copper (ppm) | 36.0 | 1.31 | 34.4 | 37.5 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.28 | 0.245 | 2.86 | 3.70 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.64 | 0.153 | 1.42 | 1.86 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.23 | 0.078 | 1.09 | 1.36 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 4.19 | 0.102 | 4.08 | 4.30 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 20.0 | 1.16 | 19.0 | 21.1 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 4.61 | 0.321 | 4.04 | 5.18 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 3.85 | 0.260 | 3.63 | 4.08 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.59 | 0.053 | 0.51 | 0.68 | 4-Acid Digestion |
| In, Indium (ppm) | 0.069 | 0.005 | 0.063 | 0.075 | 4-Acid Digestion |
| K, Potassium (wt.%) | 2.97 | 0.071 | 2.87 | 3.06 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 42.1 | 1.71 | 39.6 | 44.5 | 4-Acid Digestion |
| Li, Lithium (ppm) | 51 | 2.3 | 49 | 52 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.27 | 0.026 | 0.23 | 0.31 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 1.51 | 0.054 | 1.46 | 1.56 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.063 | 0.002 | 0.061 | 0.064 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 0.96 | 0.077 | 0.85 | 1.06 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 0.520 | 0.015 | 0.504 | 0.536 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 13.5 | 0.88 | 12.5 | 14.5 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 36.3 | 1.50 | 33.5 | 39.1 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 58 | 1.7 | 55 | 60 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.062 | 0.002 | 0.059 | 0.064 | 4-Acid Digestion |
| Pb, Lead (ppm) | 24.1 | 1.49 | 22.7 | 25.4 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 9.56 | 0.669 | 8.43 | 10.69 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 176 | 8 | 168 | 185 | 4-Acid Digestion |
| Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.555 | 0.010 | 0.540 | 0.570 | 4-Acid Digestion |
| Sb, Antimony (wt.%) | 0.833 | 0.019 | 0.810 | 0.857 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 14.3 | 0.78 | 13.6 | 15.0 | 4-Acid Digestion |
| Se, Selenium (ppm) | 2.71 | 0.57 | 1.88 | 3.54 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 6.73 | 0.314 | 6.00 | 7.46 | 4-Acid Digestion |
| Sn, Tin (ppm) | 4.00 | 0.376 | 3.63 | 4.36 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 91 | 2.3 | 88 | 93 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 1.05 | 0.075 | 0.97 | 1.12 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.61 | 0.027 | 0.54 | 0.67 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.072 | 0.015 | 0.043 | 0.101 | 4-Acid Digestion |
| Th, Thorium (ppm) | 15.9 | 0.78 | 15.0 | 16.7 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.397 | 0.022 | 0.380 | 0.413 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.91 | 0.059 | 0.86 | 0.97 | 4-Acid Digestion |
| U, Uranium (ppm) | 2.92 | 0.160 | 2.78 | 3.06 | 4-Acid Digestion |
| V, Vanadium (ppm) | 105 | 3 | 101 | 108 | 4-Acid Digestion |
| W, Tungsten (ppm) | 3.13 | 0.46 | 2.75 | 3.51 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 16.0 | 0.62 | 15.3 | 16.7 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.71 | 0.17 | 1.44 | 1.98 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 105 | 3 | 101 | 109 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 130 | 5 | 124 | 136 | 4-Acid Digestion |
| Ag, Silver (ppm) | 0.215 | 0.021 | 0.194 | 0.236 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 2.55 | 0.192 | 2.44 | 2.67 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 263 | 21 | 248 | 277 | Aqua Regia Digestion |
| Ba, Barium (ppm) | 113 | 4 | 106 | 120 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 1.19 | 0.14 | 1.08 | 1.29 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 0.39 | 0.016 | 0.37 | 0.42 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.300 | 0.009 | 0.289 | 0.311 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.054 | 0.011 | 0.041 | 0.068 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 46.2 | 5.4 | 41.8 | 50.6 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 14.1 | 0.93 | 13.2 | 14.9 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 101 | 3 | 98 | 104 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 7.68 | 0.509 | 7.22 | 8.15 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 35.3 | 1.22 | 33.9 | 36.7 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 3.78 | 0.083 | 3.70 | 3.86 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 7.85 | 0.609 | 7.31 | 8.40 | Aqua Regia Digestion |
| Ge, Germanium (ppm) | 0.10 | 0.02 | 0.08 | 0.13 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.52 | 0.038 | 0.47 | 0.57 | Aqua Regia Digestion |
| Hg, Mercury (ppm) | 0.033 | 0.007 | 0.022 | 0.043 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.030 | 0.002 | 0.028 | 0.032 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.875 | 0.056 | 0.838 | 0.912 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 24.9 | 4.5 | 21.6 | 28.2 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 38.5 | 2.25 | 36.2 | 40.7 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 1.30 | 0.058 | 1.25 | 1.34 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.056 | 0.002 | 0.054 | 0.058 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 0.81 | 0.039 | 0.75 | 0.88 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.035 | 0.006 | 0.030 | 0.040 | Aqua Regia Digestion |
| Nb, Niobium (ppm) | 0.38 | 0.09 | 0.26 | 0.50 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 55 | 2.3 | 52 | 58 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.055 | 0.002 | 0.053 | 0.057 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 14.7 | 1.00 | 13.7 | 15.8 | Aqua Regia Digestion |
| Re, Rhenium (ppm) | < 0.001 | IND | IND | IND | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.557 | 0.018 | 0.541 | 0.573 | Aqua Regia Digestion |
| Sb, Antimony (wt.%) | 0.727 | 0.040 | 0.693 | 0.762 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 6.71 | 0.503 | 6.24 | 7.17 | Aqua Regia Digestion |
| Se, Selenium (ppm) | 2.08 | 0.179 | 1.80 | 2.36 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 1.32 | 0.090 | 1.21 | 1.43 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 29.1 | 1.62 | 27.7 | 30.5 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Th, Thorium (ppm) | 12.3 | 1.3 | 11.3 | 13.3 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.110 | 0.006 | 0.105 | 0.115 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.53 | 0.026 | 0.50 | 0.56 | Aqua Regia Digestion |
| U, Uranium (ppm) | 1.48 | 0.18 | 1.35 | 1.60 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 66 | 2.4 | 64 | 69 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 0.56 | 0.09 | 0.47 | 0.66 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 8.31 | 0.766 | 7.65 | 8.96 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 94 | 3.6 | 90 | 98 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 18.8 | 1.60 | 16.9 | 20.8 | 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) | 82 | - | - | - | 4-Acid Digestion |
| Dy - Dysprosium (ppm) | 3.28 | - | - | - | 4-Acid Digestion |
| Er - Erbium (ppm) | 1.64 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.23 | - | - | - | 4-Acid Digestion |
| Gd - Gadolinium (ppm) | 4.61 | - | - | - | 4-Acid Digestion |
| Ho - Holmium (ppm) | 0.59 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 42.1 | - | - | - | 4-Acid Digestion |
| Lu - Lutetium (ppm) | 0.27 | - | - | - | 4-Acid Digestion |
| Nd - Neodymium (ppm) | 36.3 | - | - | - | 4-Acid Digestion |
| Pr - Praseodymium (ppm) | 9.56 | - | - | - | 4-Acid Digestion |
| Sm - Samarium (ppm) | 6.73 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.61 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 16.0 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.71 | - | - | - | 4-Acid Digestion |
| Ag - Silver (ppm) | 0.215 | - | - | - | Aqua Regia |
| As - Arsenic (ppm) | 263 | - | - | - | Aqua Regia |
| Bi - Bismuth (ppm) | 0.39 | - | - | - | Aqua Regia |
| Cd - Cadmium (ppm) | 0.054 | - | - | - | Aqua Regia |
| Co - Cobalt (ppm) | 14.1 | - | - | - | Aqua Regia |
| Cu - Copper (ppm) | 35.3 | - | - | - | Aqua Regia |
| Hg - Mercury (ppm) | 0.033 | - | - | - | Aqua Regia |
| Mo - Molybdenum (ppm) | 0.81 | - | - | - | Aqua Regia |
| Sn - Tin (ppm) | 1.32 | - | - | - | Aqua Regia |
| Tl - Thallium (ppm) | 0.53 | - | - | - | Aqua Regia |
| Zn - Zinc (ppm) | 94 | - | - | - | 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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