OREAS 291b
primary
metasediments
orogenic lode gold
OREAS 291b
SKU: 291b
OREAS 291b 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.
Thirty-nine 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 440-470 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) | 4.26 | 0.162 | 4.20 | 4.32 | Pb Fire Assay |
| Au, Gold (ppm) | 4.35 | 0.151 | 4.27 | 4.42 | Bi Fire Assay |
| Au, Gold (ppm) | 4.42 | 0.120 | 4.37 | 4.47 | PhotonAssay |
| Au, Gold (ppm) | 3.95 | 0.213 | 3.86 | 4.05 | Aqua Regia Digestion (sample weights 10-50g) |
| Sb, Antimony (wt.%) | 1.56 | 0.063 | 1.49 | 1.63 | Peroxide Fusion ICP |
| Sb, Antimony (wt.%) | 1.59 | 0.025 | 1.55 | 1.62 | Borate Fusion XRF |
| Ag, Silver (ppm) | 0.325 | 0.022 | 0.294 | 0.357 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 7.39 | 0.225 | 7.16 | 7.63 | 4-Acid Digestion |
| As, Arsenic (ppm) | 401 | 10 | 392 | 409 | 4-Acid Digestion |
| Ba, Barium (ppm) | 697 | 31 | 673 | 720 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 2.50 | 0.088 | 2.41 | 2.58 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 0.75 | 0.073 | 0.69 | 0.81 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 0.383 | 0.006 | 0.371 | 0.395 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 81 | 5.0 | 76 | 86 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 15.9 | 0.64 | 15.2 | 16.7 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 134 | 3 | 129 | 139 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 11.3 | 0.33 | 10.8 | 11.8 | 4-Acid Digestion |
| Cu, Copper (ppm) | 53 | 1.9 | 51 | 55 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.21 | 0.233 | 2.81 | 3.61 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.61 | 0.17 | 1.36 | 1.86 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.18 | 0.044 | 1.08 | 1.28 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 3.85 | 0.099 | 3.75 | 3.95 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 20.0 | 0.95 | 19.1 | 20.9 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 4.56 | 0.253 | 4.11 | 5.01 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 3.79 | 0.218 | 3.57 | 4.00 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.59 | 0.052 | 0.51 | 0.66 | 4-Acid Digestion |
| In, Indium (ppm) | 0.076 | 0.010 | 0.060 | 0.093 | 4-Acid Digestion |
| K, Potassium (wt.%) | 3.00 | 0.088 | 2.91 | 3.08 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 42.0 | 1.65 | 39.8 | 44.1 | 4-Acid Digestion |
| Li, Lithium (ppm) | 49.3 | 2.51 | 47.2 | 51.4 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.27 | 0.03 | 0.24 | 0.31 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 1.47 | 0.049 | 1.43 | 1.52 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.046 | 0.001 | 0.045 | 0.047 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 2.17 | 0.176 | 2.00 | 2.34 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 0.508 | 0.014 | 0.492 | 0.524 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 13.0 | 1.8 | 11.7 | 14.2 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 35.8 | 1.10 | 33.7 | 38.0 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 58 | 2.2 | 55 | 60 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.054 | 0.002 | 0.052 | 0.056 | 4-Acid Digestion |
| Pb, Lead (ppm) | 48.6 | 3.24 | 46.2 | 51.0 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 9.41 | 0.619 | 8.44 | 10.39 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 176 | 8 | 169 | 183 | 4-Acid Digestion |
| Re, Rhenium (ppm) | 0.004 | 0.001 | 0.002 | 0.005 | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.818 | 0.016 | 0.798 | 0.838 | 4-Acid Digestion |
| Sb, Antimony (wt.%) | 1.41 | 0.057 | 1.32 | 1.50 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 14.1 | 0.89 | 13.3 | 14.8 | 4-Acid Digestion |
| Se, Selenium (ppm) | 3.65 | 0.73 | 2.98 | 4.33 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 6.57 | 0.252 | 5.99 | 7.15 | 4-Acid Digestion |
| Sn, Tin (ppm) | 4.54 | 0.87 | 3.77 | 5.30 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 95 | 2.7 | 92 | 98 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 1.01 | 0.077 | 0.94 | 1.08 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.60 | 0.032 | 0.55 | 0.66 | 4-Acid Digestion |
| Th, Thorium (ppm) | 15.9 | 0.67 | 15.2 | 16.6 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.375 | 0.040 | 0.348 | 0.402 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.93 | 0.071 | 0.88 | 0.98 | 4-Acid Digestion |
| U, Uranium (ppm) | 2.89 | 0.161 | 2.74 | 3.05 | 4-Acid Digestion |
| V, Vanadium (ppm) | 100 | 4 | 97 | 104 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 15.6 | 0.62 | 14.9 | 16.4 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.68 | 0.129 | 1.46 | 1.90 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 120 | 3 | 116 | 123 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 129 | 6 | 124 | 134 | 4-Acid Digestion |
| Ag, Silver (ppm) | 0.310 | 0.020 | 0.286 | 0.334 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 2.40 | 0.196 | 2.26 | 2.55 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 366 | 23 | 349 | 383 | Aqua Regia Digestion |
| Ba, Barium (ppm) | 103 | 4 | 98 | 107 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 1.20 | 0.14 | 1.10 | 1.31 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 0.78 | 0.041 | 0.72 | 0.83 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.250 | 0.008 | 0.241 | 0.258 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.070 | 0.008 | 0.053 | 0.087 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 44.9 | 4.5 | 41.1 | 48.8 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 14.8 | 0.76 | 14.1 | 15.6 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 97 | 2.8 | 94 | 99 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 7.32 | 0.498 | 6.93 | 7.71 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 52 | 1.5 | 51 | 54 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 3.44 | 0.066 | 3.36 | 3.52 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 7.40 | 0.727 | 6.81 | 7.99 | Aqua Regia Digestion |
| Ge, Germanium (ppm) | 0.097 | 0.016 | 0.077 | 0.117 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.46 | 0.10 | 0.38 | 0.55 | Aqua Regia Digestion |
| Hg, Mercury (ppm) | 0.068 | 0.009 | 0.056 | 0.080 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.036 | 0.003 | 0.032 | 0.039 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.863 | 0.061 | 0.824 | 0.903 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 23.1 | 3.0 | 20.4 | 25.8 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 35.8 | 2.96 | 33.2 | 38.4 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 1.23 | 0.045 | 1.20 | 1.27 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.040 | 0.001 | 0.039 | 0.041 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 1.97 | 0.095 | 1.86 | 2.08 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.032 | 0.005 | 0.028 | 0.037 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 55 | 2.3 | 52 | 58 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.046 | 0.002 | 0.044 | 0.048 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 39.9 | 2.18 | 37.8 | 42.0 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 77 | 3.8 | 72 | 81 | Aqua Regia Digestion |
| Re, Rhenium (ppm) | 0.004 | 0.001 | 0.003 | 0.005 | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.818 | 0.016 | 0.802 | 0.834 | Aqua Regia Digestion |
| Sb, Antimony (wt.%) | 1.26 | 0.21 | 1.02 | 1.51 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 6.29 | 0.485 | 5.86 | 6.72 | Aqua Regia Digestion |
| Se, Selenium (ppm) | 2.94 | 0.171 | 2.60 | 3.28 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 1.80 | 0.126 | 1.67 | 1.93 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 34.2 | 2.06 | 32.5 | 35.8 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.057 | 0.011 | 0.041 | 0.073 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 11.3 | 0.96 | 10.5 | 12.2 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.095 | 0.005 | 0.092 | 0.099 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.54 | 0.050 | 0.50 | 0.57 | Aqua Regia Digestion |
| U, Uranium (ppm) | 1.41 | 0.138 | 1.31 | 1.52 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 60 | 1.3 | 58 | 62 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 0.93 | 0.19 | 0.74 | 1.12 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 8.01 | 0.752 | 7.45 | 8.57 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 109 | 3 | 106 | 112 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 16.1 | 2.3 | 14.0 | 18.2 | 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) | 3.21 | - | - | - | 4-Acid Digestion |
| Er - Erbium (ppm) | 1.61 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.18 | - | - | - | 4-Acid Digestion |
| Gd - Gadolinium (ppm) | 4.56 | - | - | - | 4-Acid Digestion |
| Ho - Holmium (ppm) | 0.59 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 42.0 | - | - | - | 4-Acid Digestion |
| Lu - Lutetium (ppm) | 0.27 | - | - | - | 4-Acid Digestion |
| Nd - Neodymium (ppm) | 35.8 | - | - | - | 4-Acid Digestion |
| Pr - Praseodymium (ppm) | 9.41 | - | - | - | 4-Acid Digestion |
| Sm - Samarium (ppm) | 6.57 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.60 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 15.6 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.68 | - | - | - | 4-Acid Digestion |
| Ag - Silver (ppm) | 0.310 | - | - | - | Aqua Regia |
| As - Arsenic (ppm) | 366 | - | - | - | Aqua Regia |
| Bi - Bismuth (ppm) | 0.78 | - | - | - | Aqua Regia |
| Cd - Cadmium (ppm) | 0.070 | - | - | - | Aqua Regia |
| Co - Cobalt (ppm) | 14.8 | - | - | - | Aqua Regia |
| Cu - Copper (ppm) | 52 | - | - | - | Aqua Regia |
| Hg - Mercury (ppm) | 0.068 | - | - | - | Aqua Regia |
| Mo - Molybdenum (ppm) | 1.97 | - | - | - | Aqua Regia |
| Ni - Nickel (ppm) | 55 | - | - | - | Aqua Regia |
| Pb - Lead (ppm) | 39.9 | - | - | - | Aqua Regia |
| Sn - Tin (ppm) | 1.80 | - | - | - | Aqua Regia |
| Te - Tellurium (ppm) | 0.057 | - | - | - | Aqua Regia |
| Zn - Zinc (ppm) | 109 | - | - | - | 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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