OREAS 412

OREAS 412 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 54% Quartz, 23 % magnetite and 21 % 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.%) 35.97 0.202 35.72 36.23 Borate Fusion XRF
FeO, Iron(II) oxide (wt.%) 9.01 0.429 8.76 9.25 Classical Wet Chemistry
Fe3O4, Iron(II,III) oxide (wt.%) 22.11 0.418 21.35 22.86 Satmagan 135
Al2O3, Aluminium(III) oxide (wt.%) 0.360 0.018 0.340 0.381 Borate Fusion XRF
As, Arsenic (ppm) 25.5 5.1 16.7 34.4 Borate Fusion XRF
Ba, Barium (ppm) < 10.0 IND IND IND Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.334 0.006 0.327 0.341 Borate Fusion XRF
Cl, Chlorine (ppm) 111 30 68 153 Borate Fusion XRF
Fe(Calc), Iron normalised to 100% (wt.%) 35.87 0.227 35.69 36.05 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.014 0.004 0.012 0.016 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.129 0.011 0.118 0.141 Borate Fusion XRF
Mn, Manganese (wt.%) 0.044 0.004 0.042 0.046 Borate Fusion XRF
P, Phosphorus (wt.%) 0.105 0.002 0.103 0.107 Borate Fusion XRF
S, Sulphur (wt.%) 0.095 0.007 0.090 0.099 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 47.40 0.236 47.19 47.62 Borate Fusion XRF
V, Vanadium (ppm) < 10.0 IND IND IND Borate Fusion XRF
Zn, Zinc (ppm) 23.4 7.0 12.7 34.1 Borate Fusion XRF
LOI650, Loss on ignition @650 °C (wt.%) -0.382 0.041 -0.429 -0.335 Thermogravimetry
Ag, Silver (ppm) 0.226 0.016 0.196 0.256 4-Acid Digestion
Al, Aluminium (wt.%) 0.193 0.014 0.180 0.205 4-Acid Digestion
As, Arsenic (ppm) 22.2 1.21 20.8 23.6 4-Acid Digestion
Ba, Barium (ppm) 9.13 1.80 7.92 10.33 4-Acid Digestion
Be, Beryllium (ppm) 0.91 0.051 0.86 0.96 4-Acid Digestion
Bi, Bismuth (ppm) 0.29 0.015 0.27 0.31 4-Acid Digestion
Ca, Calcium (wt.%) 0.241 0.015 0.231 0.252 4-Acid Digestion
Ce, Cerium (ppm) 7.03 0.378 6.59 7.48 4-Acid Digestion
Co, Cobalt (ppm) 7.25 0.282 6.86 7.64 4-Acid Digestion
Cr, Chromium (ppm) 29.5 2.07 27.1 31.9 4-Acid Digestion
Cs, Caesium (ppm) 0.14 0.009 0.12 0.15 4-Acid Digestion
Cu, Copper (ppm) 19.6 0.83 18.3 20.9 4-Acid Digestion
Dy, Dysprosium (ppm) 0.96 0.096 0.80 1.12 4-Acid Digestion
Er, Erbium (ppm) 0.60 0.058 0.51 0.69 4-Acid Digestion
Fe, Iron (wt.%) 35.69 1.602 34.36 37.03 4-Acid Digestion
Ga, Gallium (ppm) 1.29 0.15 1.16 1.42 4-Acid Digestion
Gd, Gadolinium (ppm) 0.98 0.056 0.91 1.05 4-Acid Digestion
Hf, Hafnium (ppm) 0.100 0.005 0.094 0.105 4-Acid Digestion
In, Indium (ppm) 0.10 0.009 0.09 0.12 4-Acid Digestion
K, Potassium (wt.%) 0.013 0.004 0.006 0.019 4-Acid Digestion
La, Lanthanum (ppm) 4.20 0.318 3.87 4.53 4-Acid Digestion
Li, Lithium (ppm) 9.18 0.555 8.69 9.66 4-Acid Digestion
Mg, Magnesium (wt.%) 0.072 0.002 0.070 0.074 4-Acid Digestion
Mn, Manganese (wt.%) 0.044 0.002 0.042 0.046 4-Acid Digestion
Mo, Molybdenum (ppm) 11.7 0.44 11.3 12.2 4-Acid Digestion
Na, Sodium (wt.%) 0.013 0.004 0.009 0.017 4-Acid Digestion
Nb, Niobium (ppm) 2.09 0.111 1.93 2.25 4-Acid Digestion
Nd, Neodymium (ppm) 3.33 0.247 3.14 3.53 4-Acid Digestion
Ni, Nickel (ppm) 15.2 0.60 14.2 16.2 4-Acid Digestion
P, Phosphorus (wt.%) 0.101 0.003 0.098 0.104 4-Acid Digestion
Pb, Lead (ppm) 7.83 0.449 7.56 8.10 4-Acid Digestion
Pr, Praseodymium (ppm) 0.80 0.063 0.70 0.90 4-Acid Digestion
Rb, Rubidium (ppm) 1.06 0.067 0.97 1.16 4-Acid Digestion
Re, Rhenium (ppm) 0.004 0.001 0.002 0.005 4-Acid Digestion
S, Sulphur (wt.%) 0.096 0.004 0.094 0.099 4-Acid Digestion
Sb, Antimony (ppm) 6.01 0.424 5.62 6.40 4-Acid Digestion
Sc, Scandium (ppm) 0.51 0.06 0.43 0.59 4-Acid Digestion
Se, Selenium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Sn, Tin (ppm) 11.4 1.7 9.8 13.1 4-Acid Digestion
Sr, Strontium (ppm) 3.86 0.187 3.66 4.06 4-Acid Digestion
Ta, Tantalum (ppm) 0.18 0.015 0.16 0.21 4-Acid Digestion
Te, Tellurium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 0.36 0.025 0.33 0.39 4-Acid Digestion
Ti, Titanium (wt.%) 0.007 0.000 0.006 0.007 4-Acid Digestion
Tl, Thallium (ppm) 0.056 0.009 0.047 0.065 4-Acid Digestion
U, Uranium (ppm) 1.85 0.073 1.73 1.97 4-Acid Digestion
V, Vanadium (ppm) 10.4 1.7 8.8 11.9 4-Acid Digestion
W, Tungsten (ppm) 35.0 4.2 31.4 38.7 4-Acid Digestion
Y, Yttrium (ppm) 8.48 0.417 7.97 9.00 4-Acid Digestion
Zn, Zinc (ppm) 20.7 1.64 19.3 22.1 4-Acid Digestion
Zr, Zirconium (ppm) 3.81 0.168 3.47 4.15 4-Acid Digestion
MassRec, Mass recovered (wt.%) 25.38 0.836 24.29 26.47 Davis Tube Recovery
SG, Specific Gravity (Unity) 3.54 0.088 3.45 3.62 Gas / Liquid Pycnometry
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