OREAS 263b
SKU: 263b
OREAS 263b was prepared from a blend of oxidised gold ores (from Sepon gold
mine in Laos, Stawell and Boddington gold mines in Australia) and barren
metasediments. Gold mineralisation at Sepon is localised in structural and
stratigraphic fluid traps similar in style to the sediment-hosted gold deposits
of the Carlin Trend, Nevada, USA. Mineralisation is finely disseminated and
closely associated with decalcification and variable silica replacement of
calcareous rocks along structures and at lithological contacts. The Sepon
deposit is located approximately 40 kilometres north of the town of Sepon, in
Savannakhet province of south-central Laos. At the Stawell gold mine in
west-central Victoria, the Magdala lode is intimately associated with an
intensely deformed package of volcanogenic sedimentary rocks. The Stawell ore
samples were taken from basalt contact lodes and are strongly chlorite-altered
(+/- silica, stilpnomelane) carbonaceous mudstones located directly on the
western margin of the Magdala basalt dome. Mineralisation in the ore consists of
a quartz-sericite-carbonate schist assemblage containing the sulphides
arsenopyrite, pyrrhotite and pyrite. The Boddington gold mine is located within
the Saddleback Greenstone Belt, 130 kms southeast of Perth, Western Australia.
The Saddleback Greenstone Belt is a fault bounded sliver of Archaean volcanic
and shallow level intrusive rocks, surrounded by granitic and gneissic rocks.
The mineralisation is hosted in a complex of stockwork veining with chalcopyrite
and pyrrhotite the dominant sulphides, and minor pyrite, sphalerite, cubanite,
cobaltite, arsenopyrite and pentlandite. Thirty-one commercial analytical
laboratories participated in the program to certify the elements reported below.
Gold by fire assay (25-50g charge weight) with AAS and ICP-OES finish;
Gold by aqua regia digestion (15-50g sample weight) with ICP-OES and/or
ICP-MS finish;
Gold by cyanide leach (20-200g) with AAS or ICP-MS finish;
Gold by x-ray photon assay with recommended gross mass 450±15g (12 Chrysos
PhotonAssay units at 7 laboratories with two rounds of data reported from each
unit);
Full ICP-OES and ICP-MS elemental suites by 4-acid 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 subsamples (see Table 6 in the
‘Homogeneity Evaluation’ section of the Certificate).
Specifications
- State: oxide
- Matrix: mudstone
- Mineralisation: Carlin style
- CRM Group: Au, Au only
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL High | Method |
|---|---|---|---|---|---|
| Au, Gold (ppm) | 0.214 | 0.012 | 0.210 | 0.219 | Pb Fire Assay |
| Au, Gold (ppm) | 0.211 | 0.026 | 0.205 | 0.217 | PhotonAssay |
| Au, Gold (ppm) | 0.191 | 0.016 | 0.185 | 0.197 | Aqua Regia Digestion (sample weights 10-50g) |
| Au, Gold (ppm) | 0.191 | 0.015 | 0.185 | 0.197 | Cyanide Leach |
| Ag, Silver (ppm) | 0.307 | 0.017 | 0.277 | 0.337 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 6.30 | 0.219 | 6.15 | 6.45 | 4-Acid Digestion |
| As, Arsenic (ppm) | 257 | 8 | 251 | 264 | 4-Acid Digestion |
| Ba, Barium (ppm) | 479 | 14 | 466 | 492 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 2.16 | 0.136 | 2.06 | 2.26 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 10.1 | 0.62 | 9.3 | 10.9 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 0.294 | 0.009 | 0.284 | 0.305 | 4-Acid Digestion |
| Cd, Cadmium (ppm) | 0.044 | 0.017 | 0.024 | 0.064 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 82 | 3.7 | 79 | 85 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 4.81 | 0.261 | 4.48 | 5.14 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 78 | 6.3 | 74 | 82 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 8.01 | 0.363 | 7.74 | 8.29 | 4-Acid Digestion |
| Cu, Copper (ppm) | 75 | 3.5 | 71 | 79 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.21 | 0.282 | 2.95 | 3.47 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.67 | 0.21 | 1.47 | 1.86 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.02 | 0.082 | 0.93 | 1.11 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 2.68 | 0.098 | 2.62 | 2.75 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 16.6 | 0.61 | 16.0 | 17.1 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 4.26 | 0.240 | 3.90 | 4.62 | 4-Acid Digestion |
| Ge, Germanium (ppm) | 0.12 | 0.01 | 0.09 | 0.14 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 3.37 | 0.209 | 3.19 | 3.56 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.58 | 0.07 | 0.52 | 0.64 | 4-Acid Digestion |
| In, Indium (ppm) | 0.081 | 0.007 | 0.070 | 0.092 | 4-Acid Digestion |
| K, Potassium (wt.%) | 2.03 | 0.065 | 1.98 | 2.08 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 40.3 | 2.76 | 38.4 | 42.2 | 4-Acid Digestion |
| Li, Lithium (ppm) | 37.9 | 1.73 | 36.8 | 39.0 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.27 | 0.023 | 0.23 | 0.31 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 0.527 | 0.032 | 0.508 | 0.546 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.017 | 0.001 | 0.017 | 0.018 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 2.36 | 0.173 | 2.21 | 2.51 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 0.115 | 0.008 | 0.110 | 0.120 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 10.1 | 1.2 | 9.2 | 10.9 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 33.1 | 1.75 | 31.4 | 34.8 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 44.0 | 1.28 | 42.6 | 45.4 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.029 | 0.001 | 0.028 | 0.030 | 4-Acid Digestion |
| Pb, Lead (ppm) | 19.4 | 1.13 | 18.6 | 20.1 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 9.18 | 0.618 | 8.60 | 9.77 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 132 | 4 | 127 | 136 | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.029 | 0.005 | 0.026 | 0.032 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 11.3 | 1.07 | 10.5 | 12.1 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 10.9 | 0.57 | 10.4 | 11.4 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 5.86 | 0.372 | 5.47 | 6.25 | 4-Acid Digestion |
| Sn, Tin (ppm) | 11.6 | 1.05 | 10.9 | 12.4 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 52 | 2.4 | 50 | 55 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 0.93 | 0.044 | 0.85 | 1.01 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.56 | 0.08 | 0.48 | 0.65 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.26 | 0.03 | 0.22 | 0.30 | 4-Acid Digestion |
| Th, Thorium (ppm) | 15.1 | 0.71 | 14.5 | 15.7 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.315 | 0.027 | 0.297 | 0.333 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 1.16 | 0.072 | 1.11 | 1.21 | 4-Acid Digestion |
| Tm, Thulium (ppm) | 0.24 | 0.015 | 0.21 | 0.26 | 4-Acid Digestion |
| U, Uranium (ppm) | 2.49 | 0.134 | 2.35 | 2.62 | 4-Acid Digestion |
| V, Vanadium (ppm) | 76 | 1.8 | 74 | 78 | 4-Acid Digestion |
| W, Tungsten (ppm) | 42.5 | 3.65 | 39.6 | 45.5 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 14.3 | 1.5 | 13.4 | 15.2 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.63 | 0.24 | 1.42 | 1.83 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 44.0 | 2.10 | 42.2 | 45.8 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 110 | 9 | 104 | 117 | 4-Acid Digestion |
| Ag, Silver (ppm) | 0.275 | 0.020 | 0.252 | 0.297 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 0.967 | 0.060 | 0.907 | 1.028 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 231 | 7 | 224 | 239 | Aqua Regia Digestion |
| B, Boron (ppm) | < 10.0 | IND | IND | IND | Aqua Regia Digestion |
| Ba, Barium (ppm) | 68 | 9 | 61 | 75 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 0.68 | 0.047 | 0.63 | 0.73 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 9.10 | 0.514 | 8.55 | 9.65 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.162 | 0.005 | 0.154 | 0.170 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.035 | 0.007 | 0.025 | 0.045 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 48.2 | 5.5 | 44.3 | 52.1 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 3.36 | 0.41 | 3.08 | 3.65 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 33.9 | 1.45 | 32.3 | 35.5 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 2.09 | 0.23 | 1.91 | 2.27 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 73 | 2.9 | 70 | 76 | Aqua Regia Digestion |
| Eu, Europium (ppm) | 0.60 | 0.059 | 0.51 | 0.69 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 2.29 | 0.094 | 2.21 | 2.36 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 2.89 | 0.253 | 2.67 | 3.12 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.37 | 0.031 | 0.34 | 0.40 | Aqua Regia Digestion |
| Hg, Mercury (ppm) | 0.10 | 0.03 | 0.07 | 0.13 | Aqua Regia Digestion |
| Ho, Holmium (ppm) | 0.27 | 0.022 | 0.24 | 0.30 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.238 | 0.022 | 0.221 | 0.256 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 23.2 | 3.2 | 21.1 | 25.3 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 8.03 | 0.533 | 7.45 | 8.61 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 0.182 | 0.014 | 0.169 | 0.195 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.013 | 0.001 | 0.013 | 0.014 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 2.15 | 0.132 | 2.03 | 2.28 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.019 | 0.002 | 0.018 | 0.021 | Aqua Regia Digestion |
| Nb, Niobium (ppm) | 0.13 | 0.02 | 0.11 | 0.15 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 37.9 | 1.43 | 36.4 | 39.4 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.023 | 0.002 | 0.022 | 0.024 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 12.9 | 1.24 | 12.0 | 13.9 | Aqua Regia Digestion |
| Pr, Praseodymium (ppm) | 6.43 | 1.51 | 4.36 | 8.51 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 20.9 | 1.30 | 19.6 | 22.3 | Aqua Regia Digestion |
| Re, Rhenium (ppm) | < 0.001 | IND | IND | IND | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.027 | 0.005 | 0.023 | 0.031 | Aqua Regia Digestion |
| Sb, Antimony (ppm) | 7.35 | 1.27 | 6.67 | 8.03 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 2.33 | 0.172 | 2.16 | 2.49 | Aqua Regia Digestion |
| Se, Selenium (ppm) | 0.45 | 0.09 | 0.29 | 0.61 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 1.69 | 0.117 | 1.56 | 1.83 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 17.3 | 3.3 | 15.2 | 19.4 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Tb, Terbium (ppm) | 0.37 | 0.07 | 0.28 | 0.47 | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.22 | 0.020 | 0.20 | 0.25 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 10.7 | 0.95 | 10.1 | 11.3 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.015 | 0.004 | 0.013 | 0.017 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.43 | 0.034 | 0.40 | 0.46 | Aqua Regia Digestion |
| U, Uranium (ppm) | 1.31 | 0.094 | 1.23 | 1.38 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 22.0 | 1.11 | 20.8 | 23.2 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 14.8 | 1.41 | 13.2 | 16.3 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 6.20 | 0.378 | 5.79 | 6.61 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 30.0 | 2.74 | 27.9 | 32.0 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 15.7 | 1.03 | 14.8 | 16.6 | Aqua Regia Digestion |
Product Specifications
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) | 3.21 | - | - | - | 4-Acid Digestion |
| Er - Erbium (ppm) | 1.67 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.02 | - | - | - | 4-Acid Digestion |
| Gd - Gadolinium (ppm) | 4.26 | - | - | - | 4-Acid Digestion |
| Ho - Holmium (ppm) | 0.58 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 40.3 | - | - | - | 4-Acid Digestion |
| Lu - Lutetium (ppm) | 0.27 | - | - | - | 4-Acid Digestion |
| Nd - Neodymium (ppm) | 33.1 | - | - | - | 4-Acid Digestion |
| Pr - Praseodymium (ppm) | 9.18 | - | - | - | 4-Acid Digestion |
| Sm - Samarium (ppm) | 5.86 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.56 | - | - | - | 4-Acid Digestion |
| Tm - Thulium (ppm) | 0.24 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 14.3 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.63 | - | - | - | 4-Acid Digestion |
| Ag - Silver (ppm) | 0.275 | - | - | - | Aqua Regia |
| As - Arsenic (ppm) | 231 | - | - | - | Aqua Regia |
| Bi - Bismuth (ppm) | 9.10 | - | - | - | Aqua Regia |
| Cd - Cadmium (ppm) | 0.035 | - | - | - | Aqua Regia |
| Co - Cobalt (ppm) | 3.36 | - | - | - | Aqua Regia |
| Cu - Copper (ppm) | 73 | - | - | - | Aqua Regia |
| Ni - Nickel (ppm) | 37.9 | - | - | - | Aqua Regia |
| Pb - Lead (ppm) | 12.9 | - | - | - | Aqua Regia |
| Sb - Antimony (ppm) | 7.35 | - | - | - | Aqua Regia |
| Se - Selenium (ppm) | 0.45 | - | - | - | Aqua Regia |
| Te - Tellurium (ppm) | 0.22 | - | - | - | Aqua Regia |
| Zn - Zinc (ppm) | 30.0 | - | - | - | 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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