OREAS 415

OREAS 415 is a certified reference material composed of magnetite iron ore, obtained from the Hawks Nest Magnetite Project under an exploration license with Peak Iron Mines. The CRM contains approximately 67 % magnetite and 25 % hematite. The project site is situated approximately 120 kilometres south of Coober Pedy in South Australia.

The certification program includes:

  • Lithium borate fusion extended iron ore suite package with X-ray fluorescence
  • Thermogravimetry: Loss on ignition (LOI) by multi-point TGA at 371 °C, 425 °C, 650 °C and 1000 °C on dry sample basis
  • 4-acid digestion (HNO3-HF-HClO4-HCl) with full suite ICP-OES and ICP-MS elemental packages
  • Acid digestion (HF/H2SO4) with titration to determine FeO (Fe2+ expressed as FeO)
  • Satmagan 135 analysis to determine magnetic susceptibility (reported as the theoretical Fe3O4 content)
  • Davis Tube Recovery (DTR) using a 20-30g sample size to determine magnetic content and reported as the ‘Mass Recovered’ (MassRec)
  • Gas/liquid pycnometer analysis to determine Specific Gravity

 

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Fe, Iron (wt.%) 65.60 0.416 65.30 65.90 Borate Fusion XRF
FeO, Iron(II) oxide (wt.%) 20.30 0.775 19.81 20.79 Classical Wet Chemistry
Fe3O4, Iron(II,III) oxide (wt.%) 56.81 1.392 55.22 58.41 Satmagan 135
Al2O3, Aluminium(III) oxide (wt.%) 1.06 0.029 1.05 1.08 Borate Fusion XRF
As, Arsenic (ppm) 35.7 5.6 26.7 44.7 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.276 0.010 0.266 0.286 Borate Fusion XRF
Cl, Chlorine (ppm) 255 47 202 308 Borate Fusion XRF
Fe(Calc), Iron normalised to 100% (wt.%) 65.09 0.378 64.86 65.33 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.032 0.004 0.029 0.035 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.550 0.013 0.533 0.566 Borate Fusion XRF
Mn, Manganese (wt.%) 0.057 0.004 0.052 0.063 Borate Fusion XRF
P, Phosphorus (wt.%) 0.052 0.002 0.051 0.054 Borate Fusion XRF
S, Sulphur (wt.%) 0.510 0.017 0.499 0.522 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 4.67 0.080 4.61 4.73 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.038 0.008 0.030 0.045 Borate Fusion XRF
Zn, Zinc (ppm) 49.1 10.6 33.4 64.9 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) -1.00 0.12 -1.08 -0.93 Thermogravimetry
LOI371, Loss on ignition @371 °C (wt.%) -1.20 0.16 -1.33 -1.07 Thermogravimetry
LOI425, Loss on ignition @425 °C (wt.%) -1.45 0.16 -1.56 -1.34 Thermogravimetry
LOI650, Loss on ignition @650 °C (wt.%) -1.66 0.151 -1.77 -1.55 Thermogravimetry
Ag, Silver (ppm) 0.218 0.017 0.192 0.244 4-Acid Digestion
Al, Aluminium (wt.%) 0.566 0.024 0.544 0.588 4-Acid Digestion
As, Arsenic (ppm) 33.6 1.46 32.3 34.9 4-Acid Digestion
Ba, Barium (ppm) 19.0 3.3 16.8 21.3 4-Acid Digestion
Be, Beryllium (ppm) 1.35 0.082 1.27 1.43 4-Acid Digestion
Bi, Bismuth (ppm) 0.51 0.023 0.49 0.53 4-Acid Digestion
Ca, Calcium (wt.%) 0.191 0.013 0.181 0.202 4-Acid Digestion
Ce, Cerium (ppm) 18.2 1.22 17.1 19.3 4-Acid Digestion
Co, Cobalt (ppm) 31.2 2.01 29.0 33.4 4-Acid Digestion
Cr, Chromium (ppm) 31.2 5.7 27.7 34.8 4-Acid Digestion
Cs, Caesium (ppm) 0.26 0.014 0.25 0.28 4-Acid Digestion
Cu, Copper (ppm) 52 3.0 49 54 4-Acid Digestion
Dy, Dysprosium (ppm) 1.47 0.095 1.33 1.61 4-Acid Digestion
Er, Erbium (ppm) 0.87 0.042 0.79 0.95 4-Acid Digestion
Fe, Iron (wt.%) 63.79 2.942 61.84 65.73 4-Acid Digestion
Ga, Gallium (ppm) 3.80 0.320 3.54 4.05 4-Acid Digestion
Gd, Gadolinium (ppm) 1.52 0.077 1.41 1.63 4-Acid Digestion
Ge, Germanium (ppm) 1.24 0.19 1.06 1.43 4-Acid Digestion
Hf, Hafnium (ppm) 0.30 0.006 0.30 0.31 4-Acid Digestion
Ho, Holmium (ppm) 0.31 0.018 0.29 0.33 4-Acid Digestion
In, Indium (ppm) 0.086 0.006 0.073 0.099 4-Acid Digestion
K, Potassium (wt.%) 0.030 0.004 0.026 0.034 4-Acid Digestion
La, Lanthanum (ppm) 12.1 0.74 11.4 12.9 4-Acid Digestion
Li, Lithium (ppm) 18.3 1.07 17.4 19.1 4-Acid Digestion
Mg, Magnesium (wt.%) 0.303 0.021 0.285 0.321 4-Acid Digestion
Mn, Manganese (wt.%) 0.053 0.004 0.050 0.056 4-Acid Digestion
Mo, Molybdenum (ppm) 4.91 0.252 4.67 5.14 4-Acid Digestion
Na, Sodium (wt.%) 0.024 0.004 0.021 0.026 4-Acid Digestion
Nb, Niobium (ppm) 1.57 0.089 1.47 1.67 4-Acid Digestion
Nd, Neodymium (ppm) 7.47 0.303 7.08 7.87 4-Acid Digestion
Ni, Nickel (ppm) 37.7 1.23 36.3 39.0 4-Acid Digestion
P, Phosphorus (wt.%) 0.050 0.003 0.048 0.052 4-Acid Digestion
Pb, Lead (ppm) 7.01 0.315 6.68 7.33 4-Acid Digestion
Pr, Praseodymium (ppm) 1.97 0.088 1.83 2.12 4-Acid Digestion
Rb, Rubidium (ppm) 1.94 0.119 1.85 2.03 4-Acid Digestion
Re, Rhenium (ppm) 0.003 0.001 0.002 0.004 4-Acid Digestion
S, Sulphur (wt.%) 0.509 0.035 0.481 0.537 4-Acid Digestion
Sb, Antimony (ppm) 12.6 1.4 11.7 13.5 4-Acid Digestion
Sc, Scandium (ppm) 1.35 0.120 1.21 1.49 4-Acid Digestion
Se, Selenium (ppm) 2.08 0.36 1.51 2.64 4-Acid Digestion
Sn, Tin (ppm) 21.0 1.34 19.7 22.3 4-Acid Digestion
Sr, Strontium (ppm) 3.71 0.218 3.49 3.93 4-Acid Digestion
Ta, Tantalum (ppm) 0.42 0.018 0.39 0.45 4-Acid Digestion
Te, Tellurium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 1.37 0.045 1.32 1.42 4-Acid Digestion
Ti, Titanium (wt.%) 0.020 0.001 0.019 0.021 4-Acid Digestion
Tl, Thallium (ppm) 0.063 0.008 0.055 0.070 4-Acid Digestion
U, Uranium (ppm) 3.38 0.158 3.20 3.57 4-Acid Digestion
V, Vanadium (ppm) 22.7 1.87 20.6 24.7 4-Acid Digestion
W, Tungsten (ppm) 15.5 1.11 14.7 16.3 4-Acid Digestion
Y, Yttrium (ppm) 11.0 0.45 10.5 11.5 4-Acid Digestion
Zn, Zinc (ppm) 40.8 1.78 39.0 42.6 4-Acid Digestion
Zr, Zirconium (ppm) 13.4 0.49 12.8 14.1 4-Acid Digestion
MassRec, Mass recovered (wt.%) 64.37 1.879 61.85 66.89 Davis Tube Recovery
SG, Specific Gravity (Unity) 4.83 0.128 4.75 4.91 Gas / Liquid Pycnometry
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