OREAS 173

OREAS 173 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. A small quantity of barren oxidised siliciclastic material was added to achieve the desired Mn grade. 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.%) 28.30 0.275 28.13 28.46 Borate Fusion XRF
Fe, Iron (wt.%) 25.23 0.231 25.11 25.36 Borate Fusion XRF
P, Phosphorus (ppm) 391 7 388 395 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 7.97 0.087 7.92 8.02 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.894 0.026 0.878 0.910 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.347 0.009 0.342 0.352 Borate Fusion XRF
Cu, Copper (ppm) 108 13 98 118 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 36.08 0.331 35.89 36.26 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.852 0.018 0.843 0.862 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.308 0.020 0.296 0.320 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 36.54 0.355 36.33 36.75 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.437 0.018 0.426 0.449 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.090 0.002 0.089 0.090 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 7.10 0.079 7.06 7.14 Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.015 0.004 0.012 0.018 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.353 0.008 0.349 0.357 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 223 40 196 250 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 6.55 0.208 6.42 6.69 Thermogravimetry
SG, Specific Gravity (Unity) 4.25 0.326 4.03 4.47 Gas / Liquid Pycnometry
Al, Aluminium (wt.%) 3.58 0.320 3.30 3.86 4-Acid Digestion
As, Arsenic (ppm) 57 8 50 65 4-Acid Digestion
Ba, Barium (wt.%) 0.790 0.037 0.763 0.817 4-Acid Digestion
Be, Beryllium (ppm) 4.60 0.48 4.26 4.94 4-Acid Digestion
Bi, Bismuth (ppm) 0.94 0.079 0.88 0.99 4-Acid Digestion
Ca, Calcium (wt.%) 0.246 0.011 0.239 0.254 4-Acid Digestion
Cd, Cadmium (ppm) 0.27 0.04 0.24 0.31 4-Acid Digestion
Ce, Cerium (ppm) 64 3.3 62 67 4-Acid Digestion
Co, Cobalt (ppm) 70 3.2 68 73 4-Acid Digestion
Cr, Chromium (ppm) 69 6.8 63 74 4-Acid Digestion
Cs, Caesium (ppm) 0.91 0.09 0.83 1.00 4-Acid Digestion
Cu, Copper (ppm) 103 4 99 106 4-Acid Digestion
Dy, Dysprosium (ppm) 7.54 0.680 6.63 8.44 4-Acid Digestion
Er, Erbium (ppm) 4.39 0.386 3.87 4.90 4-Acid Digestion
Fe, Iron (wt.%) 25.17 0.660 24.65 25.68 4-Acid Digestion
Ga, Gallium (ppm) 16.3 2.4 14.2 18.5 4-Acid Digestion
Hf, Hafnium (ppm) 2.05 0.21 1.89 2.22 4-Acid Digestion
Ho, Holmium (ppm) 1.56 0.18 1.36 1.75 4-Acid Digestion
In, Indium (ppm) 0.088 0.009 0.081 0.095 4-Acid Digestion
K, Potassium (wt.%) 0.708 0.027 0.688 0.728 4-Acid Digestion
La, Lanthanum (ppm) 34.5 3.20 32.0 37.0 4-Acid Digestion
Li, Lithium (ppm) 1181 65 1136 1226 4-Acid Digestion
Lu, Lutetium (ppm) 0.60 0.046 0.54 0.67 4-Acid Digestion
Mg, Magnesium (wt.%) 0.166 0.012 0.157 0.175 4-Acid Digestion
Mn, Manganese (wt.%) 28.25 0.555 27.79 28.72 4-Acid Digestion
Mo, Molybdenum (ppm) 2.06 0.28 1.80 2.32 4-Acid Digestion
Na, Sodium (wt.%) 0.320 0.023 0.301 0.339 4-Acid Digestion
Nb, Niobium (ppm) 5.10 0.471 4.68 5.53 4-Acid Digestion
Nd, Neodymium (ppm) 35.8 3.8 31.6 40.0 4-Acid Digestion
Ni, Nickel (ppm) 137 6 131 143 4-Acid Digestion
P, Phosphorus (wt.%) 0.035 0.003 0.033 0.038 4-Acid Digestion
Pb, Lead (ppm) 282 23 266 299 4-Acid Digestion
Pr, Praseodymium (ppm) 8.58 1.13 7.04 10.12 4-Acid Digestion
Rb, Rubidium (ppm) 11.9 1.01 11.1 12.7 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
Sb, Antimony (ppm) 3.23 0.293 2.99 3.47 4-Acid Digestion
Sc, Scandium (ppm) 16.2 1.04 15.3 17.1 4-Acid Digestion
Se, Selenium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Sm, Samarium (ppm) 8.28 1.76 5.90 10.66 4-Acid Digestion
Sn, Tin (ppm) 1.98 0.180 1.86 2.10 4-Acid Digestion
Sr, Strontium (ppm) 420 24 401 439 4-Acid Digestion
Ta, Tantalum (ppm) 0.35 0.021 0.34 0.37 4-Acid Digestion
Tb, Terbium (ppm) 1.30 0.116 1.15 1.45 4-Acid Digestion
Th, Thorium (ppm) 4.43 0.233 4.28 4.59 4-Acid Digestion
Ti, Titanium (wt.%) 0.199 0.011 0.190 0.208 4-Acid Digestion
Tl, Thallium (ppm) 0.82 0.076 0.76 0.89 4-Acid Digestion
Tm, Thulium (ppm) 0.61 0.060 0.53 0.69 4-Acid Digestion
U, Uranium (ppm) 1.64 0.075 1.59 1.70 4-Acid Digestion
V, Vanadium (ppm) 118 6 114 123 4-Acid Digestion
W, Tungsten (ppm) 9.11 0.711 8.59 9.63 4-Acid Digestion
Y, Yttrium (ppm) 49.6 4.50 46.3 52.9 4-Acid Digestion
Yb, Ytterbium (ppm) 3.85 0.318 3.43 4.28 4-Acid Digestion
Zn, Zinc (ppm) 80 9 72 87 4-Acid Digestion
Zr, Zirconium (ppm) 71 2.8 69 73 4-Acid Digestion
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