OREAS 901

OREAS 901 contains 89 certified values and is a low grade oxide copper-gold ore certified reference material. It is one of a suite of four transitional to oxide copper (-gold) CRMs prepared from samples sourced from CST’s Lady Annie Mine, located 120 kms northwest of Mount Isa, Queensland, Australia. Mineralisation at Lady Annie is hosted in dolomitic, carbonaceous and argillaceous sandstones and siltstones. The primary copper sulphide mineralisation at depth is dominated by chalcocite and chalcopyrite and appears to be structurally controlled, being commonly associated with fault-related silicification.

Nineteen commercial analytical laboratories participated in the program. The following methods were employed:

  • Four acid digestion with ICP-OES and ICP-MS finish (44 certified values)
  • Aqua regia digestion with ICP-OES and ICP-MS finish (43 certified values)
  • Soluble Cu via 5% H2SO4 acid leach with AAS or ICP-OES finish
  • Gold via fire assay with ICP-OES, ICP-MS, AAS or solvent extraction AAS finish
  • Gold homogeneity confirmation via instrumental neutron activation analysis (INAA) on 20 x 1g subsamples
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Cu, Copper (wt.%) 0.141 0.005 0.139 0.143 4-Acid Digestion
Au, Gold (ppb) 363 18 353 372 Pb Fire Assay
Cu-Sol(H2SO4), Copper soluble (sulphuric) (wt.%) 0.083 0.004 0.081 0.086 Sulphuric Acid 5% Leach
Ag, Silver (ppm) 0.439 0.059 0.406 0.472 4-Acid Digestion
Al, Aluminium (wt.%) 6.81 0.356 6.64 6.99 4-Acid Digestion
As, Arsenic (ppm) 71 3.6 69 72 4-Acid Digestion
Ba, Barium (ppm) 229 12 224 235 4-Acid Digestion
Be, Beryllium (ppm) 6.17 0.536 5.91 6.43 4-Acid Digestion
Bi, Bismuth (ppm) 4.75 0.185 4.66 4.85 4-Acid Digestion
Ca, Calcium (wt.%) 0.092 0.006 0.089 0.094 4-Acid Digestion
Ce, Cerium (ppm) 95 5.5 92 99 4-Acid Digestion
Co, Cobalt (ppm) 73 4.2 71 75 4-Acid Digestion
Cr, Chromium (ppm) 57 3.7 55 59 4-Acid Digestion
Cs, Caesium (ppm) 5.12 0.233 4.98 5.26 4-Acid Digestion
Fe, Iron (wt.%) 4.03 0.145 3.96 4.10 4-Acid Digestion
Ga, Gallium (ppm) 18.7 1.04 18.1 19.2 4-Acid Digestion
Hf, Hafnium (ppm) 5.27 0.449 5.00 5.55 4-Acid Digestion
In, Indium (ppm) 0.26 0.025 0.25 0.28 4-Acid Digestion
K, Potassium (wt.%) 3.67 0.189 3.57 3.77 4-Acid Digestion
La, Lanthanum (ppm) 47.0 3.24 45.2 48.7 4-Acid Digestion
Li, Lithium (ppm) 17.9 1.02 17.5 18.4 4-Acid Digestion
Lu, Lutetium (ppm) 0.53 0.09 0.46 0.60 4-Acid Digestion
Mg, Magnesium (wt.%) 0.600 0.049 0.573 0.627 4-Acid Digestion
Mn, Manganese (wt.%) 0.029 0.001 0.029 0.029 4-Acid Digestion
Mo, Molybdenum (ppm) 3.36 0.234 3.24 3.48 4-Acid Digestion
Na, Sodium (wt.%) 0.042 0.005 0.039 0.044 4-Acid Digestion
Ni, Nickel (ppm) 39.9 2.22 38.9 40.9 4-Acid Digestion
P, Phosphorus (wt.%) 0.062 0.006 0.059 0.065 4-Acid Digestion
Pb, Lead (ppm) 17.4 1.9 16.5 18.4 4-Acid Digestion
Rb, Rubidium (ppm) 161 18 150 172 4-Acid Digestion
S, Sulphur (wt.%) 0.036 0.005 0.034 0.038 4-Acid Digestion
Sb, Antimony (ppm) 2.61 0.159 2.52 2.69 4-Acid Digestion
Sc, Scandium (ppm) 14.0 1.02 13.6 14.5 4-Acid Digestion
Sn, Tin (ppm) 3.33 0.235 3.18 3.48 4-Acid Digestion
Sr, Strontium (ppm) 31.0 1.92 30.1 31.9 4-Acid Digestion
Ta, Tantalum (ppm) 0.76 0.057 0.72 0.80 4-Acid Digestion
Tb, Terbium (ppm) 1.18 0.21 1.00 1.36 4-Acid Digestion
Te, Tellurium (ppm) 0.090 0.015 0.080 0.099 4-Acid Digestion
Th, Thorium (ppm) 16.1 2.0 15.0 17.2 4-Acid Digestion
Tl, Thallium (ppm) 0.78 0.053 0.74 0.81 4-Acid Digestion
U, Uranium (ppm) 10.3 0.52 10.0 10.6 4-Acid Digestion
V, Vanadium (ppm) 81 4.3 79 83 4-Acid Digestion
Y, Yttrium (ppm) 37.4 3.64 35.4 39.4 4-Acid Digestion
Yb, Ytterbium (ppm) 3.58 0.196 3.41 3.74 4-Acid Digestion
Zn, Zinc (ppm) 24.0 3.2 22.4 25.5 4-Acid Digestion
Zr, Zirconium (ppm) 176 10 171 182 4-Acid Digestion
Ag, Silver (ppm) 0.276 0.021 0.268 0.284 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.992 0.064 0.953 1.031 Aqua Regia Digestion
As, Arsenic (ppm) 66 2.8 64 67 Aqua Regia Digestion
Au, Gold (ppb) 340 38 318 362 Aqua Regia Digestion
Ba, Barium (ppm) 86 7.1 82 90 Aqua Regia Digestion
Be, Beryllium (ppm) 4.49 0.373 4.27 4.71 Aqua Regia Digestion
Bi, Bismuth (ppm) 4.35 0.339 4.15 4.54 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.091 0.002 0.090 0.092 Aqua Regia Digestion
Ce, Cerium (ppm) 78 4.1 75 81 Aqua Regia Digestion
Co, Cobalt (ppm) 73 4.1 71 75 Aqua Regia Digestion
Cr, Chromium (ppm) 23.0 2.01 22.0 24.1 Aqua Regia Digestion
Cs, Caesium (ppm) 0.97 0.13 0.89 1.06 Aqua Regia Digestion
Cu, Copper (wt.%) 0.144 0.007 0.141 0.147 Aqua Regia Digestion
Fe, Iron (wt.%) 3.70 0.256 3.56 3.83 Aqua Regia Digestion
Ga, Gallium (ppm) 3.15 0.33 2.92 3.39 Aqua Regia Digestion
Ge, Germanium (ppm) 0.11 0.02 0.09 0.13 Aqua Regia Digestion
In, Indium (ppm) 0.21 0.018 0.20 0.22 Aqua Regia Digestion
K, Potassium (wt.%) 0.512 0.043 0.487 0.538 Aqua Regia Digestion
La, Lanthanum (ppm) 38.1 2.95 36.5 39.7 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.22 0.03 0.20 0.25 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.124 0.010 0.118 0.130 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.030 0.002 0.029 0.031 Aqua Regia Digestion
Mo, Molybdenum (ppm) 3.23 0.307 3.06 3.39 Aqua Regia Digestion
Ni, Nickel (ppm) 34.7 1.63 33.8 35.5 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.059 0.004 0.057 0.061 Aqua Regia Digestion
Pb, Lead (ppm) 14.6 1.8 13.7 15.5 Aqua Regia Digestion
Rb, Rubidium (ppm) 23.9 1.51 22.9 24.9 Aqua Regia Digestion
S, Sulphur (wt.%) 0.033 0.004 0.031 0.035 Aqua Regia Digestion
Sb, Antimony (ppm) 1.47 0.23 1.35 1.60 Aqua Regia Digestion
Sc, Scandium (ppm) 5.55 0.495 5.27 5.84 Aqua Regia Digestion
Se, Selenium (ppm) 2.68 0.30 2.58 2.77 Aqua Regia Digestion
Sn, Tin (ppm) 0.58 0.11 0.51 0.64 Aqua Regia Digestion
Sr, Strontium (ppm) 21.0 1.12 20.4 21.6 Aqua Regia Digestion
Tb, Terbium (ppm) 0.77 0.09 0.68 0.86 Aqua Regia Digestion
Te, Tellurium (ppm) 0.076 0.014 0.068 0.083 Aqua Regia Digestion
Th, Thorium (ppm) 9.13 0.765 8.68 9.58 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.008 0.002 0.007 0.009 Aqua Regia Digestion
Tl, Thallium (ppm) 0.34 0.03 0.32 0.36 Aqua Regia Digestion
U, Uranium (ppm) 5.84 0.493 5.54 6.13 Aqua Regia Digestion
Y, Yttrium (ppm) 18.8 1.46 17.9 19.7 Aqua Regia Digestion
Yb, Ytterbium (ppm) 1.49 0.15 1.34 1.63 Aqua Regia Digestion
Zn, Zinc (ppm) 20.2 2.2 19.1 21.3 Aqua Regia Digestion
Zr, Zirconium (ppm) 28.1 3.7 25.4 30.9 Aqua Regia Digestion
Downloads
Certificate DataPack SDS NRAM (231 KB)
Archived

This CRM is no longer available.
Information is provided for reference only.

Specifications