OREAS 604

OREAS 604 was prepared from gold-silver-copper bearing ore from Evolution Mining’s Mount Carlton Operation in Queensland, Australia and blended with argillic rhyodacite waste rock to achieve the desired grades. The mineralisation assemblage consists of pyrite, enargite/tennantite, tetrahedrite, digenite, covellite, sphalerite, galena, alunite, dickite, kaolinite and vuggy silica, hosted in advanced argillic altered rhyodacite containing sulphur-salts. OREAS 604 is one of a suite of six CRMs ranging in grades from 24ppm Ag, 0.2 ppm Au and 0.05% Cu to 980ppm Ag, 1.7ppm Au and 5.0% Cu.

Twenty eight commercial analytical laboratories participated in the program to certify the elements reported in Table 1 (see certificate). The following methods were employed:

  • Gold via 20-40g* fire assay with AAS (20 labs), ICP-OES (4 labs) or gravimetric (3 labs) finish;
  • Instrumental neutron activation analysis for Au on 1g subsamples to confirm homogeneity (1 laboratory);
  • Gold via 15-40g* aqua regia digestion with ICP-MS (7 labs) or AAS (5 labs) finish;
  • 4-Acid digestion for full elemental suite ICP-OES and ICP-MS (up to 21 laboratories depending on the element).
  • Aqua regia digestion (see note below) for full elemental suite ICP-OES and ICP-MS (up to 22 laboratories depending on the element).
  • Sulphur via Infrared Combustion Analysis (16 labs). 
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Ag, Silver (ppm) 488 15 481 496 Pb Fire Assay
Cu, Copper (wt.%) 2.16 0.049 2.15 2.18 4-Acid Digestion
Au, Gold (ppm) 1.43 0.055 1.41 1.45 Pb Fire Assay
Ag, Silver (ppm) 491 10 486 495 4-Acid Digestion
Al, Aluminium (wt.%) 5.82 0.236 5.69 5.94 4-Acid Digestion
As, Arsenic (ppm) 972 62 943 1001 4-Acid Digestion
Be, Beryllium (ppm) 1.13 0.111 1.07 1.18 4-Acid Digestion
Bi, Bismuth (ppm) 28.4 4.2 26.3 30.5 4-Acid Digestion
Ca, Calcium (wt.%) 0.735 0.024 0.724 0.747 4-Acid Digestion
Cd, Cadmium (ppm) 14.9 1.06 14.4 15.4 4-Acid Digestion
Ce, Cerium (ppm) 38.1 4.0 34.6 41.5 4-Acid Digestion
Co, Cobalt (ppm) 42.0 2.84 40.7 43.3 4-Acid Digestion
Cr, Chromium (ppm) 33.8 3.6 32.3 35.4 4-Acid Digestion
Cs, Caesium (ppm) 3.63 0.187 3.51 3.76 4-Acid Digestion
Dy, Dysprosium (ppm) 1.60 0.100 1.50 1.70 4-Acid Digestion
Er, Erbium (ppm) 0.62 0.044 0.59 0.66 4-Acid Digestion
Eu, Europium (ppm) 0.74 0.11 0.59 0.89 4-Acid Digestion
Fe, Iron (wt.%) 3.02 0.210 2.93 3.12 4-Acid Digestion
Ga, Gallium (ppm) 26.7 2.63 25.4 28.0 4-Acid Digestion
Gd, Gadolinium (ppm) 2.72 0.30 2.33 3.11 4-Acid Digestion
Ge, Germanium (ppm) < 5.00 IND IND IND 4-Acid Digestion
Hf, Hafnium (ppm) 3.15 0.229 3.00 3.29 4-Acid Digestion
Ho, Holmium (ppm) 0.25 0.03 0.22 0.28 4-Acid Digestion
In, Indium (ppm) 3.57 0.291 3.37 3.78 4-Acid Digestion
K, Potassium (wt.%) 1.32 0.059 1.29 1.34 4-Acid Digestion
La, Lanthanum (ppm) 19.4 3.1 16.9 21.8 4-Acid Digestion
Li, Lithium (ppm) 22.6 1.85 21.5 23.8 4-Acid Digestion
Lu, Lutetium (ppb) 81 13 74 88 4-Acid Digestion
Mg, Magnesium (wt.%) 0.208 0.013 0.202 0.214 4-Acid Digestion
Mn, Manganese (ppm) 244 13 238 250 4-Acid Digestion
Mo, Molybdenum (ppm) 4.11 0.58 3.86 4.36 4-Acid Digestion
Na, Sodium (wt.%) 0.836 0.034 0.820 0.852 4-Acid Digestion
Nb, Niobium (ppm) 8.82 0.700 8.33 9.32 4-Acid Digestion
Nd, Neodymium (ppm) 16.5 1.08 15.4 17.6 4-Acid Digestion
Ni, Nickel (ppm) 638 31 624 651 4-Acid Digestion
P, Phosphorus (ppm) 573 47 548 597 4-Acid Digestion
Pb, Lead (ppm) 994 69 962 1027 4-Acid Digestion
Pr, Praseodymium (ppm) 4.55 0.358 4.16 4.93 4-Acid Digestion
Rb, Rubidium (ppm) 51 2.8 49 53 4-Acid Digestion
S, Sulphur (wt.%) 4.59 0.201 4.49 4.69 4-Acid Digestion
Sb, Antimony (ppm) 167 8 163 170 4-Acid Digestion
Sc, Scandium (ppm) 4.81 0.64 4.51 5.12 4-Acid Digestion
Se, Selenium (ppm) 43.9 5.5 40.1 47.6 4-Acid Digestion
Sm, Samarium (ppm) 3.08 0.190 2.88 3.28 4-Acid Digestion
Sn, Tin (ppm) 3.83 0.261 3.62 4.05 4-Acid Digestion
Sr, Strontium (ppm) 398 38 379 417 4-Acid Digestion
Ta, Tantalum (ppm) < 1.00 IND IND IND 4-Acid Digestion
Tb, Terbium (ppm) 0.33 0.030 0.30 0.35 4-Acid Digestion
Te, Tellurium (ppm) 25.1 3.7 21.6 28.6 4-Acid Digestion
Th, Thorium (ppm) 7.47 0.90 6.80 8.14 4-Acid Digestion
Ti, Titanium (wt.%) 0.191 0.015 0.183 0.198 4-Acid Digestion
Tl, Thallium (ppm) 7.44 0.83 6.95 7.94 4-Acid Digestion
Tm, Thulium (ppb) 81 14 73 89 4-Acid Digestion
U, Uranium (ppm) 3.17 0.142 3.07 3.26 4-Acid Digestion
V, Vanadium (ppm) 36.0 1.89 35.1 36.9 4-Acid Digestion
W, Tungsten (ppm) 16.7 2.9 14.9 18.5 4-Acid Digestion
Y, Yttrium (ppm) 7.16 0.295 7.00 7.33 4-Acid Digestion
Yb, Ytterbium (ppm) 0.56 0.037 0.53 0.59 4-Acid Digestion
Zn, Zinc (wt.%) 0.255 0.008 0.251 0.259 4-Acid Digestion
Zr, Zirconium (ppm) 104 7 101 108 4-Acid Digestion
Ag, Silver (ppm) 492 15 484 501 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.790 0.135 0.727 0.852 Aqua Regia Digestion
As, Arsenic (ppm) 966 53 941 991 Aqua Regia Digestion
Au, Gold (ppm) 1.43 0.056 1.40 1.46 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Be, Beryllium (ppm) 0.33 0.06 0.28 0.39 Aqua Regia Digestion
Bi, Bismuth (ppm) 26.9 4.7 24.6 29.2 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.591 0.037 0.574 0.608 Aqua Regia Digestion
Cd, Cadmium (ppm) 15.5 1.35 14.9 16.2 Aqua Regia Digestion
Ce, Cerium (ppm) 23.5 3.3 20.9 26.2 Aqua Regia Digestion
Co, Cobalt (ppm) 42.6 2.41 41.5 43.6 Aqua Regia Digestion
Cr, Chromium (ppm) 32.1 2.92 31.0 33.2 Aqua Regia Digestion
Cs, Caesium (ppm) 1.22 0.22 1.03 1.41 Aqua Regia Digestion
Cu, Copper (wt.%) 2.16 0.064 2.13 2.19 Aqua Regia Digestion
Dy, Dysprosium (ppm) 0.86 0.11 0.74 0.98 Aqua Regia Digestion
Er, Erbium (ppm) 0.29 0.03 0.25 0.33 Aqua Regia Digestion
Eu, Europium (ppm) 0.39 0.06 0.31 0.47 Aqua Regia Digestion
Fe, Iron (wt.%) 2.93 0.149 2.86 2.99 Aqua Regia Digestion
Ga, Gallium (ppm) 6.10 0.85 5.55 6.64 Aqua Regia Digestion
Gd, Gadolinium (ppm) 1.49 0.21 1.25 1.72 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.58 0.11 0.49 0.67 Aqua Regia Digestion
Hg, Mercury (ppm) 1.01 0.052 0.98 1.04 Aqua Regia Digestion
Ho, Holmium (ppm) 0.14 0.006 0.13 0.15 Aqua Regia Digestion
In, Indium (ppm) 3.66 0.40 3.34 3.98 Aqua Regia Digestion
K, Potassium (wt.%) 0.167 0.021 0.156 0.178 Aqua Regia Digestion
La, Lanthanum (ppm) 10.5 1.9 9.6 11.5 Aqua Regia Digestion
Li, Lithium (ppm) 6.16 0.84 5.62 6.69 Aqua Regia Digestion
Lu, Lutetium (ppb) 27 4 23 31 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.106 0.014 0.100 0.113 Aqua Regia Digestion
Mn, Manganese (ppm) 231 8 227 235 Aqua Regia Digestion
Mo, Molybdenum (ppm) 4.02 0.361 3.87 4.17 Aqua Regia Digestion
Na, Sodium (ppm) 461 84 422 501 Aqua Regia Digestion
Nb, Niobium (ppm) 0.39 0.08 0.29 0.49 Aqua Regia Digestion
Nd, Neodymium (ppm) 10.6 1.4 9.0 12.2 Aqua Regia Digestion
Ni, Nickel (ppm) 650 28 637 663 Aqua Regia Digestion
P, Phosphorus (ppm) 248 31 231 265 Aqua Regia Digestion
Pb, Lead (ppm) 703 37 687 719 Aqua Regia Digestion
Pr, Praseodymium (ppm) 2.83 0.43 2.34 3.31 Aqua Regia Digestion
Rb, Rubidium (ppm) 8.39 1.39 7.03 9.75 Aqua Regia Digestion
S, Sulphur (wt.%) 4.26 0.213 4.15 4.36 Aqua Regia Digestion
Sb, Antimony (ppm) 126 22 115 137 Aqua Regia Digestion
Sc, Scandium (ppm) < 2.00 IND IND IND Aqua Regia Digestion
Se, Selenium (ppm) 45.0 5.1 42.0 48.1 Aqua Regia Digestion
Sm, Samarium (ppm) 1.94 0.25 1.67 2.22 Aqua Regia Digestion
Sn, Tin (ppm) 2.81 0.251 2.59 3.03 Aqua Regia Digestion
Sr, Strontium (ppm) 37.7 6.0 34.6 40.9 Aqua Regia Digestion
Tb, Terbium (ppm) 0.19 0.03 0.16 0.21 Aqua Regia Digestion
Te, Tellurium (ppm) 25.3 1.84 23.9 26.7 Aqua Regia Digestion
Th, Thorium (ppm) 3.74 0.71 3.19 4.28 Aqua Regia Digestion
Ti, Titanium (ppm) 97 20 84 110 Aqua Regia Digestion
Tl, Thallium (ppm) 7.27 1.16 6.58 7.95 Aqua Regia Digestion
U, Uranium (ppm) 1.22 0.17 1.08 1.35 Aqua Regia Digestion
V, Vanadium (ppm) 10.2 1.6 9.4 10.9 Aqua Regia Digestion
W, Tungsten (ppm) 3.50 0.71 2.94 4.05 Aqua Regia Digestion
Y, Yttrium (ppm) 3.45 0.51 3.10 3.80 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.20 0.018 0.18 0.21 Aqua Regia Digestion
Zn, Zinc (wt.%) 0.254 0.012 0.248 0.259 Aqua Regia Digestion
Zr, Zirconium (ppm) 21.1 2.9 19.3 22.9 Aqua Regia Digestion
S, Sulphur (wt.%) 4.85 0.213 4.73 4.97 Infrared Combustion
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