OREAS 411

OREAS 411 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 % Quartz, 16 % hematite and 15 % 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 20-30g 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.%) 25.87 0.173 25.71 26.02 Borate Fusion XRF
FeO, Iron(II) oxide (wt.%) 7.29 0.333 7.05 7.54 Classical Wet Chemistry
Fe3O4, Iron(II,III) oxide (wt.%) 16.07 0.551 15.31 16.83 Satmagan 135
Al2O3, Aluminium(III) oxide (wt.%) 0.470 0.027 0.452 0.488 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.244 0.007 0.236 0.252 Borate Fusion XRF
Fe(Calc), Iron normalised to 100% (wt.%) 25.77 0.223 25.57 25.96 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.033 0.005 0.031 0.036 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.167 0.015 0.155 0.178 Borate Fusion XRF
Mn, Manganese (wt.%) 0.088 0.003 0.086 0.090 Borate Fusion XRF
P, Phosphorus (wt.%) 0.070 0.002 0.068 0.072 Borate Fusion XRF
S, Sulphur (wt.%) 0.056 0.004 0.054 0.059 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 61.48 0.373 61.19 61.78 Borate Fusion XRF
Zn, Zinc (ppm) 22.2 6.3 11.3 33.0 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 0.297 0.083 0.246 0.349 Thermogravimetry
Ag, Silver (ppm) < 0.100 IND IND IND 4-Acid Digestion
Al, Aluminium (wt.%) 0.250 0.010 0.242 0.258 4-Acid Digestion
As, Arsenic (ppm) 11.9 0.64 11.2 12.5 4-Acid Digestion
Ba, Barium (ppm) 36.1 2.57 33.6 38.7 4-Acid Digestion
Be, Beryllium (ppm) 0.89 0.036 0.84 0.94 4-Acid Digestion
Bi, Bismuth (ppm) 0.17 0.010 0.15 0.18 4-Acid Digestion
Ca, Calcium (wt.%) 0.179 0.008 0.172 0.186 4-Acid Digestion
Ce, Cerium (ppm) 12.1 0.83 11.3 12.8 4-Acid Digestion
Co, Cobalt (ppm) 6.67 0.290 6.34 7.01 4-Acid Digestion
Cr, Chromium (ppm) 37.1 4.0 33.8 40.5 4-Acid Digestion
Cs, Caesium (ppm) 0.12 0.010 0.11 0.13 4-Acid Digestion
Cu, Copper (ppm) 22.2 1.43 20.8 23.6 4-Acid Digestion
Dy, Dysprosium (ppm) 1.02 0.078 0.89 1.16 4-Acid Digestion
Er, Erbium (ppm) 0.55 0.07 0.46 0.64 4-Acid Digestion
Fe, Iron (wt.%) 25.59 1.067 24.79 26.38 4-Acid Digestion
Ga, Gallium (ppm) 1.21 0.111 1.12 1.30 4-Acid Digestion
Gd, Gadolinium (ppm) 1.20 0.085 1.06 1.34 4-Acid Digestion
In, Indium (ppm) 0.093 0.009 0.075 0.111 4-Acid Digestion
K, Potassium (wt.%) 0.030 0.006 0.025 0.034 4-Acid Digestion
La, Lanthanum (ppm) 5.57 0.334 5.24 5.90 4-Acid Digestion
Li, Lithium (ppm) 7.29 0.320 6.88 7.69 4-Acid Digestion
Mg, Magnesium (wt.%) 0.096 0.009 0.088 0.104 4-Acid Digestion
Mn, Manganese (wt.%) 0.085 0.003 0.083 0.088 4-Acid Digestion
Mo, Molybdenum (ppm) 6.72 0.322 6.44 7.00 4-Acid Digestion
Nb, Niobium (ppm) 53 7 48 58 4-Acid Digestion
Nd, Neodymium (ppm) 5.80 0.377 5.35 6.24 4-Acid Digestion
Ni, Nickel (ppm) 15.3 0.69 14.5 16.0 4-Acid Digestion
P, Phosphorus (wt.%) 0.068 0.003 0.066 0.070 4-Acid Digestion
Pb, Lead (ppm) 7.20 0.479 6.81 7.59 4-Acid Digestion
Pr, Praseodymium (ppm) 1.47 0.092 1.32 1.62 4-Acid Digestion
Rb, Rubidium (ppm) 1.21 0.14 1.06 1.37 4-Acid Digestion
Re, Rhenium (ppm) 0.003 0.001 0.002 0.004 4-Acid Digestion
S, Sulphur (wt.%) 0.059 0.003 0.057 0.060 4-Acid Digestion
Sb, Antimony (ppm) 3.62 0.208 3.37 3.87 4-Acid Digestion
Sc, Scandium (ppm) 0.71 0.070 0.62 0.79 4-Acid Digestion
Se, Selenium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Sn, Tin (ppm) 10.8 0.60 10.0 11.6 4-Acid Digestion
Sr, Strontium (ppm) 27.4 0.88 26.5 28.3 4-Acid Digestion
Ta, Tantalum (ppm) 0.25 0.03 0.22 0.28 4-Acid Digestion
Te, Tellurium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 0.52 0.027 0.49 0.55 4-Acid Digestion
Ti, Titanium (wt.%) 0.010 0.001 0.010 0.011 4-Acid Digestion
Tl, Thallium (ppm) 0.029 0.006 0.018 0.039 4-Acid Digestion
U, Uranium (ppm) 1.41 0.067 1.32 1.50 4-Acid Digestion
V, Vanadium (ppm) 17.4 1.47 16.1 18.7 4-Acid Digestion
W, Tungsten (ppm) 25.4 2.06 23.7 27.1 4-Acid Digestion
Y, Yttrium (ppm) 6.38 0.298 6.07 6.69 4-Acid Digestion
Zn, Zinc (ppm) 19.8 0.80 18.9 20.6 4-Acid Digestion
Zr, Zirconium (ppm) 5.61 0.240 5.29 5.92 4-Acid Digestion
MassRec, Mass recovered (wt.%) 17.11 1.037 16.22 18.00 Davis Tube Recovery
SG, Specific Gravity (Unity) 3.24 0.064 3.20 3.29 Gas / Liquid Pycnometry
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