OREAS 935

OREAS 935 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.%) 12.55 0.388 12.40 12.71 4-Acid Digestion
Ag, Silver (ppm) 43.9 3.84 42.5 45.2 4-Acid Digestion
Zn, Zinc (ppm) 692 51 670 715 4-Acid Digestion
Al, Aluminium (wt.%) 3.55 0.504 2.78 4.32 4-Acid Digestion
As, Arsenic (ppm) 8.72 1.10 8.32 9.12 4-Acid Digestion
Be, Beryllium (ppm) < 2.00 IND IND IND 4-Acid Digestion
Bi, Bismuth (ppm) 709 60 681 738 4-Acid Digestion
Ca, Calcium (wt.%) 0.320 0.015 0.304 0.337 4-Acid Digestion
Cd, Cadmium (ppm) < 2.00 IND IND IND 4-Acid Digestion
Co, Cobalt (ppm) 77 4.1 75 79 4-Acid Digestion
Cr, Chromium (ppm) 37.6 4.5 32.6 42.5 4-Acid Digestion
Fe, Iron (wt.%) 22.89 1.607 22.06 23.71 4-Acid Digestion
La, Lanthanum (ppm) 23.0 2.5 19.8 26.2 4-Acid Digestion
Li, Lithium (ppm) 12.9 2.3 10.5 15.3 4-Acid Digestion
Mg, Magnesium (wt.%) 0.802 0.055 0.750 0.855 4-Acid Digestion
Mn, Manganese (wt.%) 0.070 0.004 0.066 0.074 4-Acid Digestion
Mo, Molybdenum (ppm) 2.00 IND IND IND 4-Acid Digestion
Nb, Niobium (ppm) 6.53 0.73 5.75 7.30 4-Acid Digestion
Ni, Nickel (ppm) 29.7 3.3 27.2 32.3 4-Acid Digestion
P, Phosphorus (wt.%) < 0.050 IND IND IND 4-Acid Digestion
Pb, Lead (ppm) 225 22 215 236 4-Acid Digestion
S, Sulphur (wt.%) 11.83 2.291 10.60 13.07 4-Acid Digestion
Sb, Antimony (ppm) 2.70 0.38 2.49 2.92 4-Acid Digestion
Se, Selenium (ppm) 88 15 80 95 4-Acid Digestion
Sn, Tin (ppm) 108 7 104 111 4-Acid Digestion
Sr, Strontium (ppm) 24.2 2.8 20.4 28.0 4-Acid Digestion
Th, Thorium (ppm) 7.90 1.18 6.83 8.98 4-Acid Digestion
Ti, Titanium (wt.%) 0.182 0.014 0.165 0.198 4-Acid Digestion
V, Vanadium (ppm) < 60 IND IND IND 4-Acid Digestion
W, Tungsten (ppm) 36.0 4.3 31.1 40.9 4-Acid Digestion
Y, Yttrium (ppm) 12.3 1.3 11.0 13.6 4-Acid Digestion
Zr, Zirconium (ppm) 47.4 5.5 40.6 54.2 4-Acid Digestion
Ag, Silver (ppm) 43.7 5.44 41.2 46.1 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.65 0.126 1.49 1.81 Aqua Regia Digestion
As, Arsenic (ppm) 8.77 1.59 8.04 9.49 Aqua Regia Digestion
Bi, Bismuth (ppm) 680 43 657 703 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.240 0.012 0.230 0.249 Aqua Regia Digestion
Co, Cobalt (ppm) 77 4.4 74 79 Aqua Regia Digestion
Cr, Chromium (ppm) 20.4 1.15 19.0 21.7 Aqua Regia Digestion
Cu, Copper (wt.%) 12.48 0.413 12.26 12.71 Aqua Regia Digestion
Fe, Iron (wt.%) 22.76 1.619 21.82 23.70 Aqua Regia Digestion
K, Potassium (wt.%) 0.217 0.019 0.196 0.237 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.665 0.045 0.609 0.722 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.064 0.006 0.058 0.071 Aqua Regia Digestion
Mo, Molybdenum (ppm) < 1.60 IND IND IND Aqua Regia Digestion
Na, Sodium (wt.%) < 0.030 IND IND IND Aqua Regia Digestion
Ni, Nickel (ppm) 26.2 2.8 22.8 29.5 Aqua Regia Digestion
Pb, Lead (ppm) 222 16 214 230 Aqua Regia Digestion
Sb, Antimony (ppm) < 2.00 IND IND IND Aqua Regia Digestion
Se, Selenium (ppm) 86 10 81 92 Aqua Regia Digestion
Sn, Tin (ppm) 96 8.4 91 102 Aqua Regia Digestion
Sr, Strontium (ppm) 13.8 0.94 12.8 14.9 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.041 0.007 0.032 0.051 Aqua Regia Digestion
W, Tungsten (ppm) 30.1 4.7 24.0 36.3 Aqua Regia Digestion
Zn, Zinc (ppm) 666 59 638 693 Aqua Regia Digestion
S, Sulphur (wt.%) 14.36 0.339 14.21 14.52 Infrared Combustion
Co, Cobalt (ppm) < 100 IND IND IND Borate Fusion XRF
Cu, Copper (wt.%) 12.54 0.296 12.33 12.74 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 33.80 1.047 33.09 34.50 Borate Fusion XRF
Pb, Lead (ppm) 255 49 208 302 Borate Fusion XRF
S, Sulphur (wt.%) 14.60 0.383 14.12 15.07 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 31.25 0.703 30.58 31.92 Borate Fusion XRF
Zn, Zinc (ppm) 688 37 664 712 Borate Fusion XRF
Ag, Silver (ppm) 43.7 4.10 40.9 46.6 Peroxide Fusion ICP
As, Arsenic (ppm) < 20.0 IND IND IND Peroxide Fusion ICP
Bi, Bismuth (ppm) 679 28 663 695 Peroxide Fusion ICP
Co, Cobalt (ppm) 85 10 78 91 Peroxide Fusion ICP
Cu, Copper (wt.%) 12.43 0.370 12.23 12.63 Peroxide Fusion ICP
Fe, Iron (wt.%) 23.59 1.153 22.97 24.21 Peroxide Fusion ICP
Pb, Lead (ppm) 233 33 220 247 Peroxide Fusion ICP
S, Sulphur (wt.%) 14.59 0.340 14.39 14.79 Peroxide Fusion ICP
Sb, Antimony (ppm) 2.79 0.42 2.54 3.04 Peroxide Fusion ICP
Se, Selenium (ppm) 105 11 95 115 Peroxide Fusion ICP
Si, Silicon (wt.%) 14.75 0.271 14.56 14.95 Peroxide Fusion ICP
Sn, Tin (ppm) 119 9 113 126 Peroxide Fusion ICP
Zn, Zinc (ppm) 721 43 699 743 Peroxide Fusion ICP
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  • 10g Sachet
    $3.80
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