OREAS 408

OREAS 408 is a certified reference material composed of hematite iron ore, obtained from the Hawks Nest Magnetite Project under an exploration license with Peak Iron Mines. The CRM contains approximately 86 % hematite and 3 % magnetite. 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 20-30 g 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.%) 63.22 0.302 62.98 63.46 Borate Fusion XRF
FeO, Iron(II) oxide (wt.%) 1.13 0.18 1.02 1.24 Classical Wet Chemistry
Fe3O4, Iron(II,III) oxide (wt.%) 1.98 0.26 1.68 2.28 Satmagan 135
Al2O3, Aluminium(III) oxide (wt.%) 0.998 0.026 0.969 1.026 Borate Fusion XRF
As, Arsenic (ppm) 35.6 5.1 26.5 44.7 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.311 0.009 0.302 0.320 Borate Fusion XRF
Cl, Chlorine (ppm) 207 48 154 261 Borate Fusion XRF
Fe(Calc), Iron normalised to 100% (wt.%) 63.24 0.136 63.10 63.37 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.027 0.003 0.025 0.030 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.068 0.009 0.058 0.079 Borate Fusion XRF
Mn, Manganese (wt.%) 0.081 0.004 0.077 0.085 Borate Fusion XRF
P, Phosphorus (wt.%) 0.015 0.001 0.015 0.016 Borate Fusion XRF
S, Sulphur (wt.%) 0.016 0.002 0.015 0.018 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 7.01 0.081 6.92 7.09 Borate Fusion XRF
Zn, Zinc (ppm) 81 9 67 96 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 0.985 0.111 0.887 1.084 Thermogravimetry
LOI371, Loss on ignition @371 °C (wt.%) 0.352 0.030 0.322 0.383 Thermogravimetry
LOI425, Loss on ignition @425 °C (wt.%) 0.414 0.034 0.359 0.468 Thermogravimetry
LOI650, Loss on ignition @650 °C (wt.%) 0.727 0.033 0.700 0.755 Thermogravimetry
Ag, Silver (ppm) 0.284 0.022 0.258 0.310 4-Acid Digestion
Al, Aluminium (wt.%) 0.524 0.022 0.505 0.542 4-Acid Digestion
As, Arsenic (ppm) 30.5 1.21 29.0 32.0 4-Acid Digestion
Ba, Barium (ppm) 28.3 1.51 26.6 30.1 4-Acid Digestion
Be, Beryllium (ppm) 2.43 0.175 2.31 2.55 4-Acid Digestion
Bi, Bismuth (ppm) 1.19 0.062 1.13 1.25 4-Acid Digestion
Ca, Calcium (wt.%) 0.216 0.010 0.206 0.227 4-Acid Digestion
Ce, Cerium (ppm) 15.9 0.80 15.1 16.7 4-Acid Digestion
Co, Cobalt (ppm) 32.6 1.64 30.9 34.2 4-Acid Digestion
Cr, Chromium (ppm) 34.1 4.9 31.0 37.3 4-Acid Digestion
Cs, Caesium (ppm) 1.65 0.062 1.57 1.73 4-Acid Digestion
Cu, Copper (ppm) 21.2 0.91 20.1 22.3 4-Acid Digestion
Dy, Dysprosium (ppm) 3.01 0.180 2.74 3.28 4-Acid Digestion
Er, Erbium (ppm) 1.83 0.095 1.67 2.00 4-Acid Digestion
Fe, Iron (wt.%) 60.12 3.414 57.52 62.72 4-Acid Digestion
Ga, Gallium (ppm) 4.40 0.335 4.11 4.69 4-Acid Digestion
Gd, Gadolinium (ppm) 2.71 0.100 2.54 2.89 4-Acid Digestion
Ge, Germanium (ppm) 0.53 0.10 0.42 0.65 4-Acid Digestion
In, Indium (ppm) 0.26 0.013 0.24 0.27 4-Acid Digestion
K, Potassium (wt.%) 0.025 0.006 0.022 0.028 4-Acid Digestion
La, Lanthanum (ppm) 6.36 0.378 5.97 6.75 4-Acid Digestion
Li, Lithium (ppm) 175 12 167 183 4-Acid Digestion
Mg, Magnesium (wt.%) 0.039 0.007 0.035 0.043 4-Acid Digestion
Mn, Manganese (wt.%) 0.074 0.006 0.071 0.077 4-Acid Digestion
Mo, Molybdenum (ppm) 5.74 0.480 5.37 6.10 4-Acid Digestion
Na, Sodium (wt.%) 0.030 0.002 0.028 0.031 4-Acid Digestion
Nb, Niobium (ppm) 1.95 0.105 1.83 2.07 4-Acid Digestion
Nd, Neodymium (ppm) 9.86 0.373 9.36 10.36 4-Acid Digestion
Ni, Nickel (ppm) 27.3 1.94 25.6 28.9 4-Acid Digestion
P, Phosphorus (wt.%) 0.015 0.001 0.014 0.016 4-Acid Digestion
Pb, Lead (ppm) 24.0 3.0 21.8 26.1 4-Acid Digestion
Pr, Praseodymium (ppm) 2.11 0.099 1.97 2.25 4-Acid Digestion
Rb, Rubidium (ppm) 3.21 0.186 3.03 3.38 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.019 0.001 0.019 0.020 4-Acid Digestion
Sb, Antimony (ppm) 9.42 0.760 8.71 10.13 4-Acid Digestion
Sc, Scandium (ppm) 1.41 0.097 1.30 1.53 4-Acid Digestion
Se, Selenium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Sm, Samarium (ppm) 2.38 0.171 2.10 2.66 4-Acid Digestion
Sn, Tin (ppm) 12.9 0.96 12.0 13.9 4-Acid Digestion
Sr, Strontium (ppm) 33.9 1.20 32.5 35.4 4-Acid Digestion
Ta, Tantalum (ppm) 3.76 0.59 3.27 4.24 4-Acid Digestion
Te, Tellurium (ppm) < 0.010 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 0.81 0.044 0.76 0.86 4-Acid Digestion
Ti, Titanium (wt.%) 0.010 0.001 0.010 0.011 4-Acid Digestion
Tl, Thallium (ppm) 0.18 0.009 0.17 0.19 4-Acid Digestion
U, Uranium (ppm) 3.21 0.136 3.06 3.35 4-Acid Digestion
V, Vanadium (ppm) 15.4 2.6 13.6 17.1 4-Acid Digestion
W, Tungsten (ppm) 19.1 1.82 17.7 20.5 4-Acid Digestion
Y, Yttrium (ppm) 18.4 0.68 17.6 19.2 4-Acid Digestion
Zn, Zinc (ppm) 73 4.0 70 76 4-Acid Digestion
Zr, Zirconium (ppm) 7.37 0.202 7.13 7.60 4-Acid Digestion
SG, Specific Gravity (Unity) 4.76 0.175 4.59 4.92 Gas / Liquid Pycnometry
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