OREAS 264

OREAS 264 was prepared from oxide heap leach material sourced from the Goldstrike operation in Eureka County in north-eastern Nevada. The mining operation is located on the Carlin Trend and owned by Nevada Gold Mines (operated by Barrick).
Thirty-one commercial analytical laboratories participated in the program to certify the elements shown below. The following methods were employed:

  • Gold by fire assay (15-40g charge weight) with AAS, ICP-OES or ICP-MS finish (31 laboratories);
  • Gold by aqua regia digestion (15-50g sample weight) with ICP-MS, AAS or ICP-OES finish (22 laboratories);
  • Gold by cyanide leach (20-200g) via a variety of cyanide leach methods (LeachWELL tablets, alkaline added sodium cyanide solution and sodium cyanide liquor with LeachWELL powder) with ICP or AAS finish (20 laboratories);
  • Gold by x-ray photon assay on ~350g sample weights using 4 Chrysos PhotonAssay machines at 3 laboratories. Multiple rounds of data (comprising three or six replicates) were generated by different staff from 3 of the machines;
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion (up to 25 laboratories depending on the element);
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion (up to 25 laboratories depending on the element).
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Au, Gold (ppm) 0.307 0.011 0.304 0.311 Pb Fire Assay
Au, Gold (ppm) 0.295 0.015 0.289 0.301 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 0.273 0.021 0.264 0.282 Cyanide Leach
Au, Gold (ppm) 0.314 0.033 0.300 0.328 X-ray Photon Assay
Ag, Silver (ppm) 1.29 0.063 1.25 1.32 4-Acid Digestion
Al, Aluminium (wt.%) 4.31 0.103 4.28 4.35 4-Acid Digestion
As, Arsenic (ppm) 305 14 299 311 4-Acid Digestion
Ba, Barium (ppm) 841 21 833 849 4-Acid Digestion
Be, Beryllium (ppm) 1.49 0.104 1.44 1.53 4-Acid Digestion
Bi, Bismuth (ppm) 0.17 0.013 0.17 0.18 4-Acid Digestion
Ca, Calcium (wt.%) 0.405 0.019 0.397 0.413 4-Acid Digestion
Cd, Cadmium (ppm) 2.21 0.200 2.13 2.29 4-Acid Digestion
Ce, Cerium (ppm) 42.3 2.06 41.4 43.2 4-Acid Digestion
Co, Cobalt (ppm) 9.71 0.410 9.51 9.91 4-Acid Digestion
Cr, Chromium (ppm) 72 11 67 76 4-Acid Digestion
Cs, Caesium (ppm) 5.87 0.306 5.73 6.00 4-Acid Digestion
Cu, Copper (ppm) 94 4.2 92 95 4-Acid Digestion
Dy, Dysprosium (ppm) 3.64 0.173 3.52 3.76 4-Acid Digestion
Er, Erbium (ppm) 2.07 0.174 1.97 2.18 4-Acid Digestion
Eu, Europium (ppm) 0.93 0.069 0.88 0.99 4-Acid Digestion
Fe, Iron (wt.%) 2.24 0.072 2.21 2.27 4-Acid Digestion
Ga, Gallium (ppm) 12.7 0.46 12.5 12.9 4-Acid Digestion
Gd, Gadolinium (ppm) 3.97 0.382 3.73 4.21 4-Acid Digestion
Hf, Hafnium (ppm) 1.87 0.21 1.78 1.97 4-Acid Digestion
Ho, Holmium (ppm) 0.70 0.08 0.64 0.76 4-Acid Digestion
In, Indium (ppm) 0.039 0.002 0.039 0.040 4-Acid Digestion
K, Potassium (wt.%) 1.84 0.050 1.82 1.85 4-Acid Digestion
La, Lanthanum (ppm) 22.8 1.77 22.1 23.5 4-Acid Digestion
Li, Lithium (ppm) 19.8 1.00 19.5 20.2 4-Acid Digestion
Lu, Lutetium (ppm) 0.31 0.028 0.28 0.33 4-Acid Digestion
Mg, Magnesium (wt.%) 0.315 0.011 0.311 0.319 4-Acid Digestion
Mn, Manganese (wt.%) 0.045 0.001 0.045 0.046 4-Acid Digestion
Mo, Molybdenum (ppm) 9.69 0.461 9.50 9.88 4-Acid Digestion
Na, Sodium (wt.%) 0.036 0.010 0.032 0.040 4-Acid Digestion
Nb, Niobium (ppm) 7.79 0.533 7.56 8.02 4-Acid Digestion
Nd, Neodymium (ppm) 21.1 1.15 20.4 21.9 4-Acid Digestion
Ni, Nickel (ppm) 61 2.3 60 62 4-Acid Digestion
P, Phosphorus (wt.%) 0.217 0.008 0.214 0.221 4-Acid Digestion
Pb, Lead (ppm) 9.88 0.587 9.65 10.12 4-Acid Digestion
Pr, Praseodymium (ppm) 5.49 0.351 5.28 5.70 4-Acid Digestion
Rb, Rubidium (ppm) 76 3.7 75 78 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.129 0.004 0.128 0.131 4-Acid Digestion
Sb, Antimony (ppm) 26.3 2.43 25.3 27.4 4-Acid Digestion
Sc, Scandium (ppm) 8.38 0.310 8.25 8.52 4-Acid Digestion
Se, Selenium (ppm) 6.76 0.89 6.37 7.15 4-Acid Digestion
Sm, Samarium (ppm) 4.24 0.263 4.09 4.39 4-Acid Digestion
Sn, Tin (ppm) 1.42 0.134 1.36 1.48 4-Acid Digestion
Sr, Strontium (ppm) 100 3.3 99 101 4-Acid Digestion
Ta, Tantalum (ppm) 0.53 0.034 0.51 0.55 4-Acid Digestion
Tb, Terbium (ppm) 0.58 0.058 0.54 0.62 4-Acid Digestion
Te, Tellurium (ppm) 0.11 0.02 0.10 0.12 4-Acid Digestion
Th, Thorium (ppm) 6.99 0.431 6.81 7.18 4-Acid Digestion
Ti, Titanium (wt.%) 0.223 0.009 0.219 0.227 4-Acid Digestion
Tl, Thallium (ppm) 1.45 0.050 1.42 1.47 4-Acid Digestion
Tm, Thulium (ppm) 0.29 0.04 0.26 0.33 4-Acid Digestion
U, Uranium (ppm) 5.72 0.307 5.59 5.85 4-Acid Digestion
V, Vanadium (ppm) 301 10 297 305 4-Acid Digestion
W, Tungsten (ppm) 5.28 0.298 5.15 5.42 4-Acid Digestion
Y, Yttrium (ppm) 20.8 1.07 20.4 21.2 4-Acid Digestion
Yb, Ytterbium (ppm) 2.10 0.21 1.98 2.23 4-Acid Digestion
Zn, Zinc (ppm) 224 7 221 227 4-Acid Digestion
Zr, Zirconium (ppm) 70 7 67 73 4-Acid Digestion
Ag, Silver (ppm) 0.573 0.032 0.557 0.589 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.21 0.142 1.14 1.28 Aqua Regia Digestion
As, Arsenic (ppm) 300 13 295 306 Aqua Regia Digestion
Ba, Barium (ppm) 482 22 472 493 Aqua Regia Digestion
Be, Beryllium (ppm) 1.01 0.075 0.98 1.05 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.16 0.013 0.16 0.17 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.389 0.021 0.381 0.398 Aqua Regia Digestion
Cd, Cadmium (ppm) 2.26 0.178 2.19 2.34 Aqua Regia Digestion
Ce, Cerium (ppm) 10.4 0.89 10.0 10.9 Aqua Regia Digestion
Co, Cobalt (ppm) 9.66 0.494 9.44 9.87 Aqua Regia Digestion
Cr, Chromium (ppm) 37.9 4.1 36.0 39.7 Aqua Regia Digestion
Cs, Caesium (ppm) 2.76 0.51 2.51 3.01 Aqua Regia Digestion
Cu, Copper (ppm) 92 2.9 91 93 Aqua Regia Digestion
Dy, Dysprosium (ppm) 2.61 0.220 2.43 2.78 Aqua Regia Digestion
Er, Erbium (ppm) 1.24 0.090 1.18 1.30 Aqua Regia Digestion
Eu, Europium (ppm) 0.65 0.035 0.61 0.69 Aqua Regia Digestion
Fe, Iron (wt.%) 2.09 0.075 2.06 2.13 Aqua Regia Digestion
Ga, Gallium (ppm) 4.05 0.363 3.83 4.27 Aqua Regia Digestion
Gd, Gadolinium (ppm) 3.08 0.31 2.83 3.33 Aqua Regia Digestion
Ge, Germanium (ppm) < 0.10 IND IND IND Aqua Regia Digestion
Hf, Hafnium (ppm) 0.20 0.03 0.18 0.22 Aqua Regia Digestion
Hg, Mercury (ppm) 1.96 0.159 1.87 2.04 Aqua Regia Digestion
Ho, Holmium (ppm) 0.48 0.026 0.45 0.50 Aqua Regia Digestion
In, Indium (ppm) 0.030 0.001 0.029 0.030 Aqua Regia Digestion
K, Potassium (wt.%) 0.529 0.068 0.498 0.560 Aqua Regia Digestion
La, Lanthanum (ppm) 5.02 0.363 4.84 5.19 Aqua Regia Digestion
Li, Lithium (ppm) 3.63 0.233 3.50 3.76 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.13 0.008 0.13 0.14 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.099 0.011 0.093 0.104 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.046 0.002 0.045 0.046 Aqua Regia Digestion
Mo, Molybdenum (ppm) 9.15 0.668 8.86 9.45 Aqua Regia Digestion
Nb, Niobium (ppm) 0.063 0.012 0.054 0.071 Aqua Regia Digestion
Nd, Neodymium (ppm) 7.55 1.09 6.63 8.48 Aqua Regia Digestion
Ni, Nickel (ppm) 59 2.9 58 60 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.204 0.011 0.200 0.209 Aqua Regia Digestion
Pb, Lead (ppm) 9.30 0.520 9.05 9.54 Aqua Regia Digestion
Pr, Praseodymium (ppm) 1.66 0.27 1.43 1.89 Aqua Regia Digestion
Rb, Rubidium (ppm) 21.5 3.5 19.6 23.4 Aqua Regia Digestion
S, Sulphur (wt.%) 0.104 0.011 0.099 0.109 Aqua Regia Digestion
Sb, Antimony (ppm) 13.9 2.5 12.8 15.0 Aqua Regia Digestion
Sc, Scandium (ppm) 4.89 0.277 4.75 5.03 Aqua Regia Digestion
Se, Selenium (ppm) 6.09 0.87 5.60 6.57 Aqua Regia Digestion
Sm, Samarium (ppm) 2.34 0.186 2.19 2.49 Aqua Regia Digestion
Sn, Tin (ppm) 0.58 0.08 0.54 0.62 Aqua Regia Digestion
Sr, Strontium (ppm) 79 5.1 77 81 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.45 0.026 0.43 0.47 Aqua Regia Digestion
Te, Tellurium (ppm) 0.10 0.01 0.10 0.11 Aqua Regia Digestion
Th, Thorium (ppm) 2.60 0.26 2.47 2.73 Aqua Regia Digestion
Tl, Thallium (ppm) 0.93 0.052 0.91 0.96 Aqua Regia Digestion
Tm, Thulium (ppm) 0.15 0.007 0.15 0.16 Aqua Regia Digestion
U, Uranium (ppm) 3.33 0.147 3.26 3.39 Aqua Regia Digestion
V, Vanadium (ppm) 146 16 139 154 Aqua Regia Digestion
W, Tungsten (ppm) 1.32 0.23 1.22 1.43 Aqua Regia Digestion
Y, Yttrium (ppm) 13.5 0.83 13.1 13.9 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.95 0.052 0.92 0.99 Aqua Regia Digestion
Zn, Zinc (ppm) 221 9 218 225 Aqua Regia Digestion
Zr, Zirconium (ppm) 7.79 1.16 7.12 8.47 Aqua Regia Digestion
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