OREAS 174

OREAS 174 has been prepared from manganese ores sourced from the Glosam Mine situated within Postmasburg Manganese Field located in the Northern Cape Province of South Africa. The ores are composed mainly of braunite group minerals including braunite (3Mn2O3.MnSiO3), partridgeite (Mn2O3) and bixbyite (Mn,Fe)2O3.

Fifteen laboratories participated in the program employing the following methods:

  • Mn ore package for Al2O3, BaO, CaO, Cr2O3, Fe2O3, K2O, MgO, MnO, Na2O, P2O5, S, SiO2, TiO2 & V2O5 by borate fusion with XRF finish;
  • Thermogravimetry: Loss on Ignition (LOI) at 1000°C;
  • 4-acid digestion for full suite elemental package by ICP-OES and MS finish;
  • Specific gravity by gas/liquid pycnometry or volumetric flask.
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Mn, Manganese (wt.%) 33.96 0.278 33.77 34.14 Borate Fusion XRF
Fe, Iron (wt.%) 20.32 0.115 20.27 20.36 Borate Fusion XRF
P, Phosphorus (ppm) 451 14 445 457 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 7.36 0.082 7.31 7.41 Borate Fusion XRF
BaO, Barium oxide (wt.%) 1.06 0.029 1.04 1.08 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.320 0.010 0.315 0.326 Borate Fusion XRF
Cu, Copper (ppm) 111 14 95 127 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 29.05 0.165 28.98 29.12 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.820 0.019 0.810 0.831 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.354 0.015 0.346 0.361 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 43.84 0.359 43.61 44.08 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.431 0.030 0.410 0.452 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.103 0.003 0.102 0.105 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 6.06 0.092 6.01 6.10 Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.039 0.007 0.035 0.043 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.379 0.009 0.375 0.384 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 238 44 210 266 Borate Fusion XRF
LOI1000, Loss On Ignition @1000 °C (wt.%) 7.32 0.368 7.09 7.54 Thermogravimetry
SG, Specific Gravity (Unity) 4.36 0.182 4.22 4.49 Gas / Liquid Pycnometry
Al, Aluminium (wt.%) 3.29 0.272 3.03 3.55 4-Acid Digestion
As, Arsenic (ppm) 28.3 1.84 26.5 30.0 4-Acid Digestion
Ba, Barium (wt.%) 0.937 0.040 0.908 0.966 4-Acid Digestion
Be, Beryllium (ppm) 4.26 0.46 3.93 4.60 4-Acid Digestion
Bi, Bismuth (ppm) 0.36 0.016 0.35 0.38 4-Acid Digestion
Ca, Calcium (wt.%) 0.231 0.010 0.224 0.237 4-Acid Digestion
Cd, Cadmium (ppm) 0.33 0.05 0.29 0.37 4-Acid Digestion
Ce, Cerium (ppm) 59 2.8 57 61 4-Acid Digestion
Co, Cobalt (ppm) 70 2.0 68 72 4-Acid Digestion
Cr, Chromium (ppm) 84 10 76 92 4-Acid Digestion
Cs, Caesium (ppm) 0.65 0.07 0.59 0.72 4-Acid Digestion
Cu, Copper (ppm) 97 6.6 92 102 4-Acid Digestion
Dy, Dysprosium (ppm) 9.67 0.960 8.39 10.95 4-Acid Digestion
Er, Erbium (ppm) 5.78 0.59 4.99 6.56 4-Acid Digestion
Fe, Iron (wt.%) 20.06 0.742 19.47 20.65 4-Acid Digestion
Ga, Gallium (ppm) 17.7 3.4 14.9 20.5 4-Acid Digestion
Gd, Gadolinium (ppm) 10.6 0.88 9.4 11.8 4-Acid Digestion
Hf, Hafnium (ppm) 2.07 0.174 1.96 2.18 4-Acid Digestion
Ho, Holmium (ppm) 2.04 0.24 1.77 2.31 4-Acid Digestion
In, Indium (ppm) 0.077 0.006 0.071 0.083 4-Acid Digestion
K, Potassium (wt.%) 0.678 0.023 0.665 0.692 4-Acid Digestion
La, Lanthanum (ppm) 37.1 3.65 34.2 39.9 4-Acid Digestion
Li, Lithium (ppm) 843 49 809 877 4-Acid Digestion
Lu, Lutetium (ppm) 0.82 0.063 0.74 0.90 4-Acid Digestion
Mg, Magnesium (wt.%) 0.198 0.017 0.186 0.211 4-Acid Digestion
Mn, Manganese (wt.%) 34.10 0.550 33.58 34.63 4-Acid Digestion
Mo, Molybdenum (ppm) 1.93 0.31 1.63 2.23 4-Acid Digestion
Na, Sodium (wt.%) 0.326 0.025 0.308 0.343 4-Acid Digestion
Nb, Niobium (ppm) 5.57 0.483 5.20 5.95 4-Acid Digestion
Nd, Neodymium (ppm) 43.5 2.99 39.5 47.5 4-Acid Digestion
Ni, Nickel (ppm) 145 11 137 153 4-Acid Digestion
P, Phosphorus (wt.%) 0.044 0.003 0.042 0.047 4-Acid Digestion
Pb, Lead (ppm) 285 27 266 304 4-Acid Digestion
Pr, Praseodymium (ppm) 9.83 1.25 8.08 11.58 4-Acid Digestion
Rb, Rubidium (ppm) 8.37 0.729 7.85 8.89 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
Sb, Antimony (ppm) 1.80 0.099 1.72 1.89 4-Acid Digestion
Sc, Scandium (ppm) 16.8 1.52 15.9 17.6 4-Acid Digestion
Se, Selenium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Sm, Samarium (ppm) 9.73 2.04 6.86 12.59 4-Acid Digestion
Sn, Tin (ppm) 1.84 0.113 1.76 1.93 4-Acid Digestion
Sr, Strontium (ppm) 528 39 498 558 4-Acid Digestion
Ta, Tantalum (ppm) 0.40 0.037 0.38 0.41 4-Acid Digestion
Tb, Terbium (ppm) 1.60 0.146 1.41 1.80 4-Acid Digestion
Th, Thorium (ppm) 4.37 0.205 4.24 4.50 4-Acid Digestion
Ti, Titanium (wt.%) 0.223 0.010 0.216 0.230 4-Acid Digestion
Tl, Thallium (ppm) 0.29 0.03 0.26 0.31 4-Acid Digestion
Tm, Thulium (ppm) 0.79 0.10 0.65 0.93 4-Acid Digestion
U, Uranium (ppm) 1.36 0.061 1.32 1.40 4-Acid Digestion
V, Vanadium (ppm) 124 6 119 129 4-Acid Digestion
W, Tungsten (ppm) 3.96 0.271 3.77 4.14 4-Acid Digestion
Y, Yttrium (ppm) 69 5.5 65 73 4-Acid Digestion
Yb, Ytterbium (ppm) 5.14 0.489 4.49 5.80 4-Acid Digestion
Zn, Zinc (ppm) 89 5.6 84 94 4-Acid Digestion
Zr, Zirconium (ppm) 71 3.2 69 74 4-Acid Digestion
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