OREAS 913

OREAS 913 was prepared from volcanic-hosted massive sulphide (VMS) ore sourced from the Ming Lode, located in Newfoundland & Labrador, Canada. The Ming Lode is characterised by polymetallic sulphide assemblages containing copper, zinc, gold and silver, occurring as semi-massive to massive sulphide zones within volcanic host rocks. Sulphide mineralisation is dominated by pyrite and chalcopyrite hosted within a silica–sericite-altered rhyodacite matrix. The principal sulphide minerals, in approximate order of abundance, are pyrite, chalcopyrite, cubanite, sphalerite, pyrrhotite, arsenopyrite and galena.

Twenty-eight commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:

  • Gold by fire assay (15-50g charge weight) with ICP-OES, ICP-MS or AAS finish
  • Gold by aqua regia digestion (10-50g sample weight) with ICP-OES, ICP-MS or AAS finish
  • Total Sulphur by infrared combustion furnace
  • Lithium borate or sodium peroxide fusion with full suite ICP-OES and ICP-MS elemental packages
  • 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.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 2.06 0.044 2.05 2.08 Pb Fire Assay
Cu, Copper (wt.%) 1.51 0.030 1.47 1.54 4-Acid Digestion
Zn, Zinc (wt.%) 1.23 0.034 1.19 1.26 4-Acid Digestion
Au, Gold (ppm) 1.94 0.171 1.84 2.04 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 24.37 0.527 23.91 24.83 Infrared Combustion
Al, Aluminium (wt.%) 4.01 0.093 3.91 4.11 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 1014 44 962 1067 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 125 5 117 132 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) < 1.00 IND IND IND Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 6.16 0.171 5.84 6.48 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 1.14 0.046 1.08 1.19 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) 55 3.9 50 59 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 8.99 0.487 8.40 9.58 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 85 4.8 79 91 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 100 19 85 115 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 0.58 0.11 0.39 0.78 Borate / Peroxide Fusion ICP
Cu, Copper (wt.%) 1.49 0.022 1.46 1.52 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 1.06 0.096 0.91 1.21 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 0.61 0.06 0.49 0.74 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.32 0.032 0.26 0.38 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 23.07 0.440 22.38 23.76 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 12.3 0.51 11.2 13.4 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 1.06 0.096 0.94 1.18 Borate / Peroxide Fusion ICP
Ge, Germanium (ppm) 4.38 0.63 3.54 5.22 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.21 0.014 0.18 0.24 Borate / Peroxide Fusion ICP
In, Indium (ppm) 1.46 0.119 1.33 1.59 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 1.25 0.086 1.18 1.32 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 4.05 0.280 3.68 4.41 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.10 0.01 0.08 0.12 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.800 0.032 0.773 0.826 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.026 0.002 0.024 0.027 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 62 7 56 68 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 2.10 0.42 1.55 2.64 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 4.59 0.309 4.00 5.18 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 54 11 46 62 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 1401 53 1350 1453 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 1.07 0.048 1.00 1.14 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 24.7 1.47 22.9 26.4 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 24.30 0.495 23.73 24.87 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 107 3 103 111 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 12.0 0.80 10.3 13.7 Borate / Peroxide Fusion ICP
Se, Selenium (ppm) 58 10 44 71 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 34.48 0.933 33.17 35.79 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 1.04 0.11 0.82 1.26 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 13.0 1.07 10.8 15.1 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 51 3.1 48 54 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.17 0.015 0.15 0.19 Borate / Peroxide Fusion ICP
Te, Tellurium (ppm) 4.94 0.373 4.02 5.86 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 1.10 0.068 0.98 1.22 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.178 0.008 0.171 0.185 Borate / Peroxide Fusion ICP
Tl, Thallium (ppm) 9.16 0.736 8.43 9.89 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.093 0.009 0.075 0.111 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 4.59 0.284 4.27 4.92 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 96 6.1 90 101 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 5.32 0.65 4.11 6.54 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 5.72 0.393 5.16 6.27 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 0.64 0.08 0.52 0.77 Borate / Peroxide Fusion ICP
Zn, Zinc (wt.%) 1.22 0.058 1.17 1.27 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 44.8 3.57 39.6 50.0 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 13.1 0.67 12.6 13.6 4-Acid Digestion
Al, Aluminium (wt.%) 3.89 0.186 3.74 4.03 4-Acid Digestion
As, Arsenic (ppm) 968 48 929 1008 4-Acid Digestion
Ba, Barium (ppm) 115 15 105 126 4-Acid Digestion
Be, Beryllium (ppm) 0.21 0.03 0.19 0.23 4-Acid Digestion
Bi, Bismuth (ppm) 6.12 0.431 5.80 6.43 4-Acid Digestion
Ca, Calcium (wt.%) 1.11 0.049 1.07 1.15 4-Acid Digestion
Cd, Cadmium (ppm) 57 1.8 54 59 4-Acid Digestion
Ce, Cerium (ppm) 9.13 0.530 8.55 9.70 4-Acid Digestion
Co, Cobalt (ppm) 87 3.4 84 89 4-Acid Digestion
Cr, Chromium (ppm) 99 6.5 91 106 4-Acid Digestion
Cs, Caesium (ppm) 0.51 0.040 0.47 0.55 4-Acid Digestion
Dy, Dysprosium (ppm) 1.03 0.073 0.95 1.12 4-Acid Digestion
Er, Erbium (ppm) 0.61 0.042 0.54 0.67 4-Acid Digestion
Eu, Europium (ppm) 0.32 0.024 0.29 0.35 4-Acid Digestion
Fe, Iron (wt.%) 22.36 0.558 21.64 23.08 4-Acid Digestion
Ga, Gallium (ppm) 12.5 0.76 11.8 13.3 4-Acid Digestion
Gd, Gadolinium (ppm) 1.07 0.089 0.94 1.20 4-Acid Digestion
Ge, Germanium (ppm) 0.34 0.09 0.24 0.44 4-Acid Digestion
Hf, Hafnium (ppm) 0.77 0.058 0.69 0.86 4-Acid Digestion
Ho, Holmium (ppm) 0.20 0.02 0.17 0.23 4-Acid Digestion
In, Indium (ppm) 1.48 0.078 1.40 1.55 4-Acid Digestion
K, Potassium (wt.%) 1.19 0.055 1.15 1.24 4-Acid Digestion
La, Lanthanum (ppm) 4.01 0.294 3.75 4.27 4-Acid Digestion
Li, Lithium (ppm) 5.57 0.442 5.18 5.96 4-Acid Digestion
Lu, Lutetium (ppm) 0.094 0.013 0.077 0.111 4-Acid Digestion
Mg, Magnesium (wt.%) 0.737 0.035 0.706 0.767 4-Acid Digestion
Mn, Manganese (wt.%) 0.025 0.001 0.025 0.026 4-Acid Digestion
Mo, Molybdenum (ppm) 59 2.4 56 61 4-Acid Digestion
Na, Sodium (wt.%) 0.394 0.014 0.378 0.411 4-Acid Digestion
Nb, Niobium (ppm) 1.53 0.106 1.39 1.67 4-Acid Digestion
Nd, Neodymium (ppm) 4.56 0.277 4.22 4.90 4-Acid Digestion
Ni, Nickel (ppm) 49.3 2.88 47.2 51.3 4-Acid Digestion
P, Phosphorus (wt.%) 0.013 0.001 0.012 0.014 4-Acid Digestion
Pb, Lead (ppm) 1365 56 1313 1417 4-Acid Digestion
Pr, Praseodymium (ppm) 1.09 0.081 1.00 1.19 4-Acid Digestion
Rb, Rubidium (ppm) 24.3 1.43 22.9 25.7 4-Acid Digestion
Re, Rhenium (ppm) 0.017 0.003 0.013 0.021 4-Acid Digestion
S, Sulphur (wt.%) 23.55 0.759 22.74 24.36 4-Acid Digestion
Sb, Antimony (ppm) 102 5 97 107 4-Acid Digestion
Sc, Scandium (ppm) 12.5 0.69 11.9 13.2 4-Acid Digestion
Se, Selenium (ppm) 59 6 55 64 4-Acid Digestion
Sm, Samarium (ppm) 1.05 0.086 0.89 1.22 4-Acid Digestion
Sn, Tin (ppm) 12.0 0.88 11.2 12.8 4-Acid Digestion
Sr, Strontium (ppm) 48.6 2.23 46.5 50.7 4-Acid Digestion
Ta, Tantalum (ppm) 0.11 0.01 0.10 0.12 4-Acid Digestion
Tb, Terbium (ppm) 0.16 0.02 0.14 0.18 4-Acid Digestion
Te, Tellurium (ppm) 4.98 0.400 4.61 5.34 4-Acid Digestion
Th, Thorium (ppm) 1.09 0.088 1.02 1.16 4-Acid Digestion
Ti, Titanium (wt.%) 0.135 0.007 0.127 0.143 4-Acid Digestion
Tl, Thallium (ppm) 9.29 0.605 8.80 9.77 4-Acid Digestion
Tm, Thulium (ppm) 0.080 0.016 0.062 0.097 4-Acid Digestion
U, Uranium (ppm) 4.64 0.243 4.45 4.83 4-Acid Digestion
V, Vanadium (ppm) 92 5.2 89 96 4-Acid Digestion
W, Tungsten (ppm) 4.99 0.374 4.69 5.29 4-Acid Digestion
Y, Yttrium (ppm) 5.55 0.265 5.23 5.86 4-Acid Digestion
Yb, Ytterbium (ppm) 0.59 0.07 0.52 0.67 4-Acid Digestion
Zr, Zirconium (ppm) 28.8 1.58 26.9 30.7 4-Acid Digestion
Ag, Silver (ppm) 13.1 0.71 12.6 13.5 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.02 0.066 0.97 1.07 Aqua Regia Digestion
As, Arsenic (ppm) 984 45 942 1027 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Be, Beryllium (ppm) < 0.050 IND IND IND Aqua Regia Digestion
Bi, Bismuth (ppm) 5.99 0.331 5.70 6.28 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.624 0.047 0.593 0.654 Aqua Regia Digestion
Cd, Cadmium (ppm) 55 3.8 52 57 Aqua Regia Digestion
Ce, Cerium (ppm) 6.47 0.456 6.11 6.84 Aqua Regia Digestion
Co, Cobalt (ppm) 84 4.4 81 87 Aqua Regia Digestion
Cr, Chromium (ppm) 51 4.1 48 54 Aqua Regia Digestion
Cs, Caesium (ppm) 0.20 0.02 0.18 0.22 Aqua Regia Digestion
Cu, Copper (wt.%) 1.48 0.038 1.46 1.51 Aqua Regia Digestion
Dy, Dysprosium (ppm) 0.71 0.09 0.58 0.84 Aqua Regia Digestion
Er, Erbium (ppm) 0.41 0.05 0.34 0.48 Aqua Regia Digestion
Eu, Europium (ppm) 0.20 0.03 0.16 0.24 Aqua Regia Digestion
Fe, Iron (wt.%) 21.64 0.825 20.93 22.35 Aqua Regia Digestion
Ga, Gallium (ppm) 4.66 0.389 4.37 4.95 Aqua Regia Digestion
Gd, Gadolinium (ppm) 0.73 0.13 0.56 0.91 Aqua Regia Digestion
Ge, Germanium (ppm) 0.34 0.05 0.28 0.40 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.31 0.05 0.27 0.36 Aqua Regia Digestion
Hg, Mercury (ppm) 3.43 0.283 3.14 3.72 Aqua Regia Digestion
Ho, Holmium (ppm) 0.12 0.03 0.10 0.15 Aqua Regia Digestion
In, Indium (ppm) 1.48 0.101 1.36 1.59 Aqua Regia Digestion
K, Potassium (wt.%) 0.241 0.022 0.226 0.255 Aqua Regia Digestion
La, Lanthanum (ppm) 3.09 0.193 2.90 3.27 Aqua Regia Digestion
Li, Lithium (ppm) 3.52 0.195 3.31 3.72 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.054 0.015 0.029 0.078 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.567 0.034 0.545 0.589 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.020 0.001 0.019 0.021 Aqua Regia Digestion
Mo, Molybdenum (ppm) 44.2 11.3 37.5 51.0 Aqua Regia Digestion
Na, Sodium (wt.%) 0.052 0.006 0.048 0.057 Aqua Regia Digestion
Nb, Niobium (ppm) 0.18 0.05 0.13 0.22 Aqua Regia Digestion
Nd, Neodymium (ppm) 3.13 0.38 2.60 3.66 Aqua Regia Digestion
Ni, Nickel (ppm) 47.5 2.50 45.0 50.0 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.013 0.001 0.012 0.014 Aqua Regia Digestion
Pb, Lead (ppm) 1332 73 1277 1386 Aqua Regia Digestion
Pr, Praseodymium (ppm) 0.80 0.10 0.69 0.91 Aqua Regia Digestion
Rb, Rubidium (ppm) 5.17 0.383 4.78 5.56 Aqua Regia Digestion
S, Sulphur (wt.%) 23.08 0.918 22.31 23.86 Aqua Regia Digestion
Sb, Antimony (ppm) 75 12 68 81 Aqua Regia Digestion
Sc, Scandium (ppm) 3.76 0.221 3.41 4.10 Aqua Regia Digestion
Se, Selenium (ppm) 62 9 56 68 Aqua Regia Digestion
Sm, Samarium (ppm) 0.70 0.09 0.57 0.83 Aqua Regia Digestion
Sn, Tin (ppm) 8.51 0.319 8.04 8.98 Aqua Regia Digestion
Sr, Strontium (ppm) 11.7 1.6 10.5 12.9 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.10 0.008 0.09 0.12 Aqua Regia Digestion
Te, Tellurium (ppm) 5.17 0.66 4.70 5.65 Aqua Regia Digestion
Th, Thorium (ppm) 0.99 0.093 0.89 1.09 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.032 0.010 0.026 0.037 Aqua Regia Digestion
Tl, Thallium (ppm) 2.77 0.189 2.63 2.91 Aqua Regia Digestion
U, Uranium (ppm) 4.29 0.173 4.12 4.47 Aqua Regia Digestion
V, Vanadium (ppm) 34.9 4.7 31.9 37.9 Aqua Regia Digestion
W, Tungsten (ppm) 2.85 0.105 2.73 2.96 Aqua Regia Digestion
Y, Yttrium (ppm) 3.28 0.258 3.03 3.52 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.38 0.05 0.32 0.45 Aqua Regia Digestion
Zn, Zinc (wt.%) 1.19 0.051 1.16 1.22 Aqua Regia Digestion
Zr, Zirconium (ppm) 12.4 1.9 10.9 13.9 Aqua Regia Digestion
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