OREAS 175

OREAS 175 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 Low 95% Confidence High Method
Al2O3, Aluminium(III) oxide (wt.%) 6.65 0.097 6.59 6.71 Borate Fusion XRF
BaO, Barium oxide (wt.%) 1.08 0.034 1.06 1.10 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.335 0.012 0.329 0.342 Borate Fusion XRF
Cu, Copper (ppm) 115 17 100 130 Borate Fusion XRF
Fe, Iron (wt.%) 15.51 0.163 15.42 15.59 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 22.17 0.233 22.05 22.30 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.663 0.015 0.655 0.670 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.353 0.014 0.346 0.360 Borate Fusion XRF
Mn, Manganese (wt.%) 41.04 0.394 40.79 41.29 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 52.99 0.509 52.67 53.32 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.322 0.020 0.308 0.335 Borate Fusion XRF
P, Phosphorus (ppm) 440 8 436 444 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.101 0.002 0.100 0.102 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 4.36 0.071 4.32 4.40 Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.079 0.009 0.074 0.085 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.297 0.007 0.293 0.301 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 270 28 244 295 Borate Fusion XRF
LOI1000, Loss on ignition @1000°C (wt.%) 6.99 0.262 6.83 7.15 Thermogravimetry
Al, Aluminium (wt.%) 2.87 0.286 2.59 3.15 4-Acid Digestion
As, Arsenic (ppm) 29.6 5.8 24.2 35.1 4-Acid Digestion
Ba, Barium (wt.%) 0.960 0.039 0.933 0.987 4-Acid Digestion
Be, Beryllium (ppm) 3.47 0.302 3.25 3.68 4-Acid Digestion
Bi, Bismuth (ppm) 0.25 0.014 0.24 0.26 4-Acid Digestion
Ca, Calcium (wt.%) 0.240 0.009 0.234 0.247 4-Acid Digestion
Cd, Cadmium (ppm) 0.25 0.03 0.23 0.28 4-Acid Digestion
Ce, Cerium (ppm) 46.0 2.83 43.5 48.5 4-Acid Digestion
Co, Cobalt (ppm) 49.8 2.21 47.6 51.9 4-Acid Digestion
Cr, Chromium (ppm) 91 12 81 101 4-Acid Digestion
Cs, Caesium (ppm) 0.51 0.046 0.47 0.55 4-Acid Digestion
Cu, Copper (ppm) 96 6.8 91 102 4-Acid Digestion
Dy, Dysprosium (ppm) 9.23 0.685 8.31 10.15 4-Acid Digestion
Er, Erbium (ppm) 5.58 0.56 4.82 6.33 4-Acid Digestion
Fe, Iron (wt.%) 15.36 0.505 14.91 15.81 4-Acid Digestion
Ga, Gallium (ppm) 19.4 4.7 14.8 23.9 4-Acid Digestion
Gd, Gadolinium (ppm) 9.95 0.745 8.96 10.94 4-Acid Digestion
Hf, Hafnium (ppm) 1.66 0.138 1.58 1.74 4-Acid Digestion
Ho, Holmium (ppm) 1.95 0.190 1.73 2.16 4-Acid Digestion
In, Indium (ppm) 0.072 0.011 0.068 0.076 4-Acid Digestion
K, Potassium (wt.%) 0.558 0.021 0.544 0.572 4-Acid Digestion
La, Lanthanum (ppm) 29.2 2.39 27.3 31.1 4-Acid Digestion
Li, Lithium (ppm) 581 37 555 608 4-Acid Digestion
Lu, Lutetium (ppm) 0.76 0.053 0.70 0.82 4-Acid Digestion
Mg, Magnesium (wt.%) 0.196 0.018 0.183 0.209 4-Acid Digestion
Mn, Manganese (wt.%) 41.19 0.728 40.58 41.81 4-Acid Digestion
Mo, Molybdenum (ppm) 2.57 0.28 2.31 2.82 4-Acid Digestion
Na, Sodium (wt.%) 0.248 0.016 0.234 0.262 4-Acid Digestion
Nb, Niobium (ppm) 4.00 0.69 3.34 4.67 4-Acid Digestion
Nd, Neodymium (ppm) 37.3 3.26 33.6 40.9 4-Acid Digestion
Ni, Nickel (ppm) 109 8 102 115 4-Acid Digestion
P, Phosphorus (wt.%) 0.042 0.005 0.038 0.046 4-Acid Digestion
Pb, Lead (ppm) 227 33 202 251 4-Acid Digestion
Pr, Praseodymium (ppm) 8.48 0.92 7.23 9.72 4-Acid Digestion
Rb, Rubidium (ppm) 6.07 0.401 5.74 6.39 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.099 0.018 0.075 0.122 4-Acid Digestion
Sb, Antimony (ppm) 1.65 0.18 1.43 1.87 4-Acid Digestion
Sc, Scandium (ppm) 14.4 1.01 13.3 15.5 4-Acid Digestion
Se, Selenium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Sm, Samarium (ppm) 9.33 1.78 6.91 11.76 4-Acid Digestion
Sn, Tin (ppm) 1.76 0.121 1.68 1.84 4-Acid Digestion
Sr, Strontium (ppm) 431 26 411 452 4-Acid Digestion
Ta, Tantalum (ppm) 0.29 0.026 0.27 0.31 4-Acid Digestion
Tb, Terbium (ppm) 1.53 0.131 1.36 1.70 4-Acid Digestion
Th, Thorium (ppm) 3.10 0.108 3.04 3.16 4-Acid Digestion
Ti, Titanium (wt.%) 0.178 0.010 0.169 0.186 4-Acid Digestion
Tl, Thallium (ppm) 0.23 0.02 0.21 0.25 4-Acid Digestion
Tm, Thulium (ppm) 0.75 0.09 0.62 0.87 4-Acid Digestion
U, Uranium (ppm) 1.17 0.073 1.12 1.22 4-Acid Digestion
V, Vanadium (ppm) 142 8 136 149 4-Acid Digestion
W, Tungsten (ppm) 4.28 0.260 4.06 4.50 4-Acid Digestion
Y, Yttrium (ppm) 66 5.8 62 70 4-Acid Digestion
Yb, Ytterbium (ppm) 4.79 0.414 4.24 5.34 4-Acid Digestion
Zn, Zinc (ppm) 83 11 74 91 4-Acid Digestion
Zr, Zirconium (ppm) 53 2.9 51 55 4-Acid Digestion
SG, Specific Gravity (Unity) 4.42 0.147 4.29 4.54 Gas / Liquid Pycnometry
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