| Description: 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).
Download Certificate OREAS264 Download DataPack OREAS264 | Analyte | Certified Value | 1SD | 95% CI Low | 95% CI High | Method |
|---|
| Ag, Silver (ppm) | 1.29 | 0.063 | 1.22 | 1.35 | 4-Acid Digestion | | Al, Aluminium (wt.%) | 4.31 | 0.103 | 4.22 | 4.41 | 4-Acid Digestion | | As, Arsenic (ppm) | 305 | 14 | 295 | 314 | 4-Acid Digestion | | Ba, Barium (ppm) | 841 | 21 | 824 | 859 | 4-Acid Digestion | | Be, Beryllium (ppm) | 1.49 | 0.104 | 1.37 | 1.61 | 4-Acid Digestion | | Bi, Bismuth (ppm) | 0.17 | 0.013 | 0.16 | 0.19 | 4-Acid Digestion | | Ca, Calcium (wt.%) | 0.405 | 0.019 | 0.39 | 0.42 | 4-Acid Digestion | | Cd, Cadmium (ppm) | 2.21 | 0.2 | 2.1 | 2.32 | 4-Acid Digestion | | Ce, Cerium (ppm) | 42.3 | 2.06 | 40.6 | 44 | 4-Acid Digestion | | Co, Cobalt (ppm) | 9.71 | 0.41 | 9.39 | 10.02 | 4-Acid Digestion | | Cr, Chromium (ppm) | 72 | 11 | 65 | 78 | 4-Acid Digestion | | Cs, Caesium (ppm) | 5.87 | 0.306 | 5.67 | 6.06 | 4-Acid Digestion | | Cu, Copper (ppm) | 94 | 4.2 | 91 | 96 | 4-Acid Digestion | | Dy, Dysprosium (ppm) | 3.64 | 0.173 | 3.43 | 3.84 | 4-Acid Digestion | | Er, Erbium (ppm) | 2.07 | 0.174 | 1.94 | 2.21 | 4-Acid Digestion | | Eu, Europium (ppm) | 0.93 | 0.069 | 0.86 | 1 | 4-Acid Digestion | | Fe, Iron (wt.%) | 2.24 | 0.072 | 2.19 | 2.29 | 4-Acid Digestion | | Ga, Gallium (ppm) | 12.7 | 0.46 | 12.2 | 13.2 | 4-Acid Digestion | | Gd, Gadolinium (ppm) | 3.97 | 0.382 | 3.67 | 4.27 | 4-Acid Digestion | | Hf, Hafnium (ppm) | 1.87 | 0.21 | 1.71 | 2.03 | 4-Acid Digestion | | Ho, Holmium (ppm) | 0.7 | 0.08 | 0.63 | 0.77 | 4-Acid Digestion | | In, Indium (ppm) | 0.039 | 0.002 | 0.037 | 0.042 | 4-Acid Digestion | | K, Potassium (wt.%) | 1.84 | 0.05 | 1.78 | 1.89 | 4-Acid Digestion | | La, Lanthanum (ppm) | 22.8 | 1.77 | 21.4 | 24.2 | 4-Acid Digestion | | Li, Lithium (ppm) | 19.8 | 1 | 18.9 | 20.7 | 4-Acid Digestion | | Lu, Lutetium (ppm) | 0.31 | 0.028 | 0.27 | 0.35 | 4-Acid Digestion | | Mg, Magnesium (wt.%) | 0.315 | 0.011 | 0.306 | 0.324 | 4-Acid Digestion | | Mn, Manganese (wt.%) | 0.045 | 0.001 | 0.044 | 0.046 | 4-Acid Digestion | | Mo, Molybdenum (ppm) | 9.69 | 0.461 | 9.3 | 10.09 | 4-Acid Digestion | | Na, Sodium (wt.%) | 0.036 | 0.01 | 0.032 | 0.041 | 4-Acid Digestion | | Nb, Niobium (ppm) | 7.79 | 0.533 | 7.31 | 8.27 | 4-Acid Digestion | | Nd, Neodymium (ppm) | 21.1 | 1.15 | 20.2 | 22 | 4-Acid Digestion | | Ni, Nickel (ppm) | 61 | 2.3 | 59 | 62 | 4-Acid Digestion | | P, Phosphorus (wt.%) | 0.217 | 0.008 | 0.209 | 0.225 | 4-Acid Digestion | | Pb, Lead (ppm) | 9.88 | 0.587 | 9.43 | 10.33 | 4-Acid Digestion | | Pr, Praseodymium (ppm) | 5.49 | 0.351 | 5.23 | 5.76 | 4-Acid Digestion | | Rb, Rubidium (ppm) | 76 | 3.7 | 73 | 79 | 4-Acid Digestion | | Re, Rhenium (ppm) | 0.002 | IND | IND | IND | 4-Acid Digestion | | S, Sulphur (wt.%) | 0.129 | 0.004 | 0.124 | 0.135 | 4-Acid Digestion | | Sb, Antimony (ppm) | 26.3 | 2.43 | 24.7 | 28 | 4-Acid Digestion | | Sc, Scandium (ppm) | 8.38 | 0.31 | 7.94 | 8.82 | 4-Acid Digestion | | Se, Selenium (ppm) | 6.76 | 0.89 | 5.97 | 7.55 | 4-Acid Digestion | | Sm, Samarium (ppm) | 4.24 | 0.263 | 4.01 | 4.47 | 4-Acid Digestion | | Sn, Tin (ppm) | 1.42 | 0.134 | 1.31 | 1.53 | 4-Acid Digestion | | Sr, Strontium (ppm) | 100 | 3.3 | 97 | 102 | 4-Acid Digestion | | Ta, Tantalum (ppm) | 0.53 | 0.034 | 0.5 | 0.56 | 4-Acid Digestion | | Tb, Terbium (ppm) | 0.58 | 0.058 | 0.53 | 0.63 | 4-Acid Digestion | | Te, Tellurium (ppm) | 0.11 | 0.02 | 0.08 | 0.14 | 4-Acid Digestion | | Th, Thorium (ppm) | 6.99 | 0.431 | 6.7 | 7.29 | 4-Acid Digestion | | Ti, Titanium (wt.%) | 0.223 | 0.009 | 0.215 | 0.231 | 4-Acid Digestion | | Tl, Thallium (ppm) | 1.45 | 0.05 | 1.39 | 1.5 | 4-Acid Digestion | | Tm, Thulium (ppm) | 0.29 | 0.04 | 0.26 | 0.33 | 4-Acid Digestion | | U, Uranium (ppm) | 5.72 | 0.307 | 5.53 | 5.91 | 4-Acid Digestion | | V, Vanadium (ppm) | 301 | 10 | 293 | 309 | 4-Acid Digestion | | W, Tungsten (ppm) | 5.28 | 0.298 | 5.05 | 5.52 | 4-Acid Digestion | | Y, Yttrium (ppm) | 20.8 | 1.07 | 19.9 | 21.7 | 4-Acid Digestion | | Yb, Ytterbium (ppm) | 2.1 | 0.21 | 1.93 | 2.28 | 4-Acid Digestion | | Zn, Zinc (ppm) | 224 | 7 | 219 | 230 | 4-Acid Digestion | | Zr, Zirconium (ppm) | 70 | 7 | 65 | 75 | 4-Acid Digestion | | Ag, Silver (ppm) | 0.573 | 0.032 | 0.544 | 0.602 | Aqua Regia Digestion | | Al, Aluminium (wt.%) | 1.21 | 0.14 | 1.13 | 1.29 | Aqua Regia Digestion | | As, Arsenic (ppm) | 300 | 13 | 293 | 308 | Aqua Regia Digestion | | Ba, Barium (ppm) | 482 | 22 | 467 | 498 | Aqua Regia Digestion | | Be, Beryllium (ppm) | 1.01 | 0.075 | 0.93 | 1.1 | Aqua Regia Digestion | | Bi, Bismuth (ppm) | 0.16 | 0.013 | 0.15 | 0.17 | Aqua Regia Digestion | | Ca, Calcium (wt.%) | 0.389 | 0.021 | 0.377 | 0.402 | Aqua Regia Digestion | | Cd, Cadmium (ppm) | 2.26 | 0.178 | 2.15 | 2.38 | Aqua Regia Digestion | | Ce, Cerium (ppm) | 10.4 | 0.89 | 9.7 | 11.1 | Aqua Regia Digestion | | Co, Cobalt (ppm) | 9.66 | 0.494 | 9.23 | 10.09 | Aqua Regia Digestion | | Cr, Chromium (ppm) | 37.9 | 4.1 | 35.5 | 40.2 | Aqua Regia Digestion | | Cs, Caesium (ppm) | 2.76 | 0.51 | 2.48 | 3.03 | Aqua Regia Digestion | | Cu, Copper (ppm) | 92 | 2.9 | 90 | 95 | Aqua Regia Digestion | | Dy, Dysprosium (ppm) | 2.61 | 0.22 | 2.33 | 2.89 | Aqua Regia Digestion | | Er, Erbium (ppm) | 1.24 | 0.09 | 1.1 | 1.38 | Aqua Regia Digestion | | Eu, Europium (ppm) | 0.65 | 0.035 | 0.58 | 0.72 | Aqua Regia Digestion | | Fe, Iron (wt.%) | 2.09 | 0.075 | 2.04 | 2.15 | Aqua Regia Digestion | | Ga, Gallium (ppm) | 4.05 | 0.363 | 3.72 | 4.37 | Aqua Regia Digestion | | Gd, Gadolinium (ppm) | 3.08 | 0.31 | 2.71 | 3.45 | Aqua Regia Digestion | | Ge, Germanium (ppm) | 0.1 | IND | IND | IND | Aqua Regia Digestion | | Hf, Hafnium (ppm) | 0.2 | 0.03 | 0.17 | 0.23 | Aqua Regia Digestion | | Hg, Mercury (ppm) | 1.96 | 0.159 | 1.86 | 2.05 | Aqua Regia Digestion | | Ho, Holmium (ppm) | 0.48 | 0.026 | 0.43 | 0.52 | Aqua Regia Digestion | | In, Indium (ppm) | 0.03 | 0.001 | 0.029 | 0.031 | Aqua Regia Digestion | | K, Potassium (wt.%) | 0.529 | 0.068 | 0.492 | 0.566 | Aqua Regia Digestion | | La, Lanthanum (ppm) | 5.02 | 0.363 | 4.77 | 5.26 | Aqua Regia Digestion | | Li, Lithium (ppm) | 3.63 | 0.233 | 3.43 | 3.83 | Aqua Regia Digestion | | Lu, Lutetium (ppm) | 0.13 | 0.008 | 0.12 | 0.15 | Aqua Regia Digestion | | Mg, Magnesium (wt.%) | 0.099 | 0.011 | 0.093 | 0.104 | Aqua Regia Digestion | | Mn, Manganese (wt.%) | 0.046 | 0.002 | 0.044 | 0.047 | Aqua Regia Digestion | | Mo, Molybdenum (ppm) | 9.15 | 0.668 | 8.76 | 9.55 | Aqua Regia Digestion | | Nb, Niobium (ppm) | 0.063 | 0.012 | 0.048 | 0.078 | Aqua Regia Digestion | | Nd, Neodymium (ppm) | 7.55 | 1.09 | 6.4 | 8.71 | Aqua Regia Digestion | | Ni, Nickel (ppm) | 59 | 2.9 | 57 | 61 | Aqua Regia Digestion | | P, Phosphorus (wt.%) | 0.204 | 0.011 | 0.197 | 0.212 | Aqua Regia Digestion | | Pb, Lead (ppm) | 9.3 | 0.52 | 8.95 | 9.65 | Aqua Regia Digestion | | Pr, Praseodymium (ppm) | 1.66 | 0.27 | 1.39 | 1.93 | Aqua Regia Digestion | | Rb, Rubidium (ppm) | 21.5 | 3.5 | 19.4 | 23.7 | Aqua Regia Digestion | | S, Sulphur (wt.%) | 0.104 | 0.011 | 0.095 | 0.112 | Aqua Regia Digestion | | Sb, Antimony (ppm) | 13.9 | 2.5 | 12.7 | 15.2 | Aqua Regia Digestion | | Sc, Scandium (ppm) | 4.89 | 0.277 | 4.67 | 5.11 | Aqua Regia Digestion | | Se, Selenium (ppm) | 6.09 | 0.87 | 5.35 | 6.82 | Aqua Regia Digestion | | Sm, Samarium (ppm) | 2.34 | 0.186 | 2.11 | 2.57 | Aqua Regia Digestion | | Sn, Tin (ppm) | 0.58 | 0.08 | 0.53 | 0.63 | Aqua Regia Digestion | | Sr, Strontium (ppm) | 79 | 5.1 | 76 | 82 | Aqua Regia Digestion | | Ta, Tantalum (ppm) | 0.01 | IND | IND | IND | Aqua Regia Digestion | | Tb, Terbium (ppm) | 0.45 | 0.026 | 0.41 | 0.49 | Aqua Regia Digestion | | Te, Tellurium (ppm) | 0.1 | 0.01 | 0.08 | 0.12 | Aqua Regia Digestion | | Th, Thorium (ppm) | 2.6 | 0.26 | 2.43 | 2.77 | Aqua Regia Digestion | | Tl, Thallium (ppm) | 0.93 | 0.052 | 0.89 | 0.98 | Aqua Regia Digestion | | Tm, Thulium (ppm) | 0.15 | 0.007 | 0.14 | 0.17 | Aqua Regia Digestion | | U, Uranium (ppm) | 3.33 | 0.147 | 3.2 | 3.46 | Aqua Regia Digestion | | V, Vanadium (ppm) | 146 | 16 | 138 | 155 | Aqua Regia Digestion | | W, Tungsten (ppm) | 1.32 | 0.23 | 1.17 | 1.48 | Aqua Regia Digestion | | Y, Yttrium (ppm) | 13.5 | 0.83 | 12.9 | 14.1 | Aqua Regia Digestion | | Yb, Ytterbium (ppm) | 0.95 | 0.052 | 0.88 | 1.02 | Aqua Regia Digestion | | Zn, Zinc (ppm) | 221 | 9 | 216 | 227 | Aqua Regia Digestion | | Zr, Zirconium (ppm) | 7.79 | 1.16 | 7.05 | 8.54 | Aqua Regia Digestion | | 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) | 0.307 | 0.011 | 0.304 | 0.311 | Pb Fire Assay | | Au, Gold (ppm) | 0.309 | 0.032 | 0.301 | 0.318 | PhotonAssay |
|
