OREAS 931

OREAS 931 is one of a suite of sixteen copper ore CRMs (OREAS 920 to OREAS 935) prepared from material from the CSA mine located near the town of Cobar in central western New South Wales, Australia. The copper ore body is hosted by the Early Devonian CSA Siltstone, a thinly bedded turbiditic sequence of carbonaceous siltstones and mudstones with minor coarser units. The CSA Siltstone is part of the Cobar Supergroup, consisting of lower syn-rift sediments and upper post-rift sag phase sediments. The mineralisation is structurally controlled and confined to a number of steeply dipping bodies within a major shear zone on the eastern margin of the Early Devonian Cobar Basin. It is characterised by low-grade greenschist alteration and epigenetic low-grade mineralisation enveloping higher-grade shoots of vein complexes or sub-massive to massive sulphides. The sulphides include chalcopyrite, pyrrhotite, pyrite, sphalerite, galena, bornite and cubanite. Iron-rich chlorite and silica are prominent alterations in the siltstone host.

Twenty two commercial analytical laboratories participated in the program to characterise the analytes reported below. The following methods were employed for method specific certification:

  • Four acid (HCl-HNO3-HF-HClO4) digestion with ICP-OES, ICP-MS or AAS finish (21 laboratories);
  • Aqua regia digestion with ICP-OES, ICP-MS or AAS finish (20 laboratories);
  • Infrared combustion furnace for sulphur (19 laboratories);
  • Borate or pyro-sulphate fusion with XRF (12 laboratories);packaging in 10g units sealed under nitrogen, in laminated foil pouches
  • Peroxide fusion with ICP-OES, ICP-MS or AAS finish (16 laboratories).

This CRM is packaged in 10g units sealed under nitrogen in laminated foil pouches.        

Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Cu, Copper (wt.%) 3.82 0.110 3.78 3.87 4-Acid Digestion
Ag, Silver (ppm) 14.0 1.90 13.4 14.7 4-Acid Digestion
Zn, Zinc (ppm) 480 32 465 494 4-Acid Digestion
Al, Aluminium (wt.%) 5.96 0.344 5.53 6.39 4-Acid Digestion
As, Arsenic (ppm) 11.6 1.4 11.1 12.1 4-Acid Digestion
Be, Beryllium (ppm) 1.99 0.128 1.83 2.16 4-Acid Digestion
Bi, Bismuth (ppm) 204 17 197 211 4-Acid Digestion
Ca, Calcium (wt.%) 0.453 0.041 0.402 0.505 4-Acid Digestion
Co, Cobalt (ppm) 46.9 2.36 46.1 47.7 4-Acid Digestion
Cr, Chromium (ppm) 58 7 50 65 4-Acid Digestion
Fe, Iron (wt.%) 11.32 0.595 11.04 11.60 4-Acid Digestion
La, Lanthanum (ppm) 34.0 3.7 29.0 38.9 4-Acid Digestion
Li, Lithium (ppm) 24.0 3.5 19.6 28.4 4-Acid Digestion
Mg, Magnesium (wt.%) 1.50 0.095 1.37 1.63 4-Acid Digestion
Mn, Manganese (wt.%) 0.095 0.007 0.088 0.103 4-Acid Digestion
Na, Sodium (wt.%) 0.201 0.020 0.174 0.227 4-Acid Digestion
Nb, Niobium (ppm) 11.0 1.07 9.6 12.4 4-Acid Digestion
Ni, Nickel (ppm) 28.8 1.86 27.1 30.5 4-Acid Digestion
P, Phosphorus (wt.%) 0.051 0.003 0.048 0.054 4-Acid Digestion
Pb, Lead (ppm) 147 11 142 152 4-Acid Digestion
S, Sulphur (wt.%) 4.12 0.407 3.92 4.32 4-Acid Digestion
Sb, Antimony (ppm) 1.70 0.155 1.62 1.78 4-Acid Digestion
Sc, Scandium (ppm) < 20.0 IND IND IND 4-Acid Digestion
Se, Selenium (ppm) 43.5 4.7 41.2 45.9 4-Acid Digestion
Sn, Tin (ppm) 42.1 3.61 40.5 43.7 4-Acid Digestion
Sr, Strontium (ppm) 34.5 4.5 28.6 40.4 4-Acid Digestion
Th, Thorium (ppm) 12.3 1.21 11.2 13.4 4-Acid Digestion
Ti, Titanium (wt.%) 0.294 0.031 0.260 0.329 4-Acid Digestion
U, Uranium (ppm) < 3.00 IND IND IND 4-Acid Digestion
V, Vanadium (ppm) 74 6.2 67 80 4-Acid Digestion
W, Tungsten (ppm) 19.8 2.1 18.3 21.2 4-Acid Digestion
Y, Yttrium (ppm) 19.6 1.27 18.1 21.1 4-Acid Digestion
Ag, Silver (ppm) 14.2 2.45 13.3 15.1 Aqua Regia Digestion
Al, Aluminium (wt.%) 2.59 0.208 2.31 2.87 Aqua Regia Digestion
As, Arsenic (ppm) 11.3 1.4 10.7 11.9 Aqua Regia Digestion
Ba, Barium (ppm) 41.3 1.99 39.2 43.5 Aqua Regia Digestion
Bi, Bismuth (ppm) 206 18 198 215 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.343 0.021 0.320 0.366 Aqua Regia Digestion
Co, Cobalt (ppm) 45.3 3.17 43.7 46.9 Aqua Regia Digestion
Cr, Chromium (ppm) 34.0 2.35 31.5 36.4 Aqua Regia Digestion
Cu, Copper (wt.%) 3.81 0.073 3.78 3.84 Aqua Regia Digestion
Fe, Iron (wt.%) 10.96 0.641 10.63 11.29 Aqua Regia Digestion
K, Potassium (wt.%) 0.242 0.016 0.222 0.263 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.35 0.168 1.16 1.54 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.087 0.004 0.084 0.091 Aqua Regia Digestion
Mo, Molybdenum (ppm) < 2.00 IND IND IND Aqua Regia Digestion
Na, Sodium (wt.%) < 0.030 IND IND IND Aqua Regia Digestion
Ni, Nickel (ppm) 28.7 3.4 24.8 32.6 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.052 0.009 0.042 0.062 Aqua Regia Digestion
Pb, Lead (ppm) 146 7 143 150 Aqua Regia Digestion
S, Sulphur (wt.%) 4.09 0.411 3.88 4.30 Aqua Regia Digestion
Sb, Antimony (ppm) < 1.20 IND IND IND Aqua Regia Digestion
Se, Selenium (ppm) 42.2 3.34 40.0 44.4 Aqua Regia Digestion
Sn, Tin (ppm) 33.0 3.10 31.0 35.0 Aqua Regia Digestion
Sr, Strontium (ppm) 17.9 1.75 15.6 20.1 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.060 0.012 0.045 0.076 Aqua Regia Digestion
V, Vanadium (ppm) 28.8 3.9 23.5 34.0 Aqua Regia Digestion
W, Tungsten (ppm) 14.3 2.4 11.3 17.3 Aqua Regia Digestion
Zn, Zinc (ppm) 472 30 458 486 Aqua Regia Digestion
S, Sulphur (wt.%) 4.49 0.171 4.42 4.56 Infrared Combustion
Co, Cobalt (ppm) < 50 IND IND IND Borate Fusion XRF
Cu, Copper (wt.%) 3.82 0.089 3.76 3.87 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 16.48 0.437 16.20 16.77 Borate Fusion XRF
Pb, Lead (ppm) 159 28 133 184 Borate Fusion XRF
S, Sulphur (wt.%) 4.53 0.143 4.41 4.65 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 55.01 0.448 54.64 55.37 Borate Fusion XRF
Zn, Zinc (ppm) 495 19 483 506 Borate Fusion XRF
Ag, Silver (ppm) 13.6 2.48 11.8 15.5 Peroxide Fusion ICP
As, Arsenic (ppm) < 15.0 IND IND IND Peroxide Fusion ICP
Bi, Bismuth (ppm) 205 9 199 210 Peroxide Fusion ICP
Co, Cobalt (ppm) 46.6 5.9 43.7 49.5 Peroxide Fusion ICP
Cu, Copper (wt.%) 3.83 0.116 3.78 3.88 Peroxide Fusion ICP
Fe, Iron (wt.%) 11.48 0.389 11.27 11.69 Peroxide Fusion ICP
Pb, Lead (ppm) 155 32 148 162 Peroxide Fusion ICP
S, Sulphur (wt.%) 4.48 0.097 4.43 4.53 Peroxide Fusion ICP
Sb, Antimony (ppm) < 4.00 IND IND IND Peroxide Fusion ICP
Se, Selenium (ppm) 50 5 48 53 Peroxide Fusion ICP
Si, Silicon (wt.%) 25.78 0.495 25.25 26.32 Peroxide Fusion ICP
Sn, Tin (ppm) < 60 IND IND IND Peroxide Fusion ICP
Zn, Zinc (ppm) 490 21 481 499 Peroxide Fusion ICP
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  • 10g Sachet
    $3.60
    2,500 +
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