OREAS 701

OREAS 701 was prepared from high grade skarn tungsten-magnetite ore from the White Rock W-Sn deposit (also known as the Rye Park mine and is located in southern-central NSW, Australia) with the addition of a minor quantity of Cu-Au concentrate. The skarn mineralisation at White Rock is hosted in flat-lying magnetite lenses within interbedded Silurian dacitic volcaniclastics with minor limestone (Hawkins Volcanics), immediately adjacent to a Late Silurian age greisenised granite intrusive (Rye Park Granite).

These lithological units lie regionally within the Eastern Subprovince of the Lachlan Orogen and adjacent to the Frogmore Fault Zone. Skarn mineralisation occurs in lenses up to 12m in thickness and is best developed within the limestone units. Tungsten minerals include ferberite (FeWO4) with lesser scheelite (CaWO4) and these occur with very minor, variable amounts of pyrrhotite, pyrite, cassiterite, molybdenite, chalcopyrite and sphalerite within massive magnetite. Gangue minerals include hedenbergite, andradite, grossular, hornblende, actinolite, feldspar, quartz, epidote, biotite and fluorite.

Twenty three commercial analytical laboratories participated in the program to certify the 114 analytes reported in Table 1. The following methods were employed:

  • Gold via 25-40g fire assay with AAS (10 labs) or ICP-OES (2 labs) finish;
  • Instrumental neutron activation analysis for Au on 1g subsamples to confirm homogeneity (1 laboratory).
  • Borate fusion XRF for full elemental suite (up to 15 laboratories)
  • Loss on ignition (LOI) at 1000°C (10 laboratories)
  • Four acid digestion for full elemental suite ICP-OES and ICP-MS (12 laboratories; with the exception of Cu and Sn – 13 laboratories);
  • Gold via 15-50g aqua regia digestion with ICP-MS (6 labs), AAS (4 labs) finish;
  • Aqua regia digestion for full elemental suite ICP-OES and ICP-MS (12 laboratories);
  • FeO via acid digestion with titrimetric finish (12 laboratories);
  • Mass recovered via Davis tube recovery (10 laboratories);
  • Fe3Ovia Satmagan (10 laboratories).
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
W, Tungsten (wt.%) 2.43 0.035 2.41 2.45 Borate Fusion XRF
Au, Gold (ppm) 1.11 0.046 1.08 1.14 Pb Fire Assay
Cu, Copper (wt.%) 0.491 0.012 0.485 0.498 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 12.40 0.134 12.31 12.48 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 5.18 0.103 5.11 5.24 Borate Fusion XRF
Cl, Chlorine (ppm) 227 23 195 260 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
Cu, Copper (wt.%) 0.485 0.023 0.467 0.503 Borate Fusion XRF
Fe, Iron (wt.%) 23.98 0.549 23.67 24.29 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 3.12 0.042 3.09 3.15 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 1.32 0.039 1.29 1.35 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.428 0.009 0.422 0.435 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.916 0.040 0.886 0.945 Borate Fusion XRF
P, Phosphorus (wt.%) 0.519 0.009 0.514 0.525 Borate Fusion XRF
S, Sulphur (wt.%) 0.694 0.019 0.679 0.710 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 33.95 0.623 33.58 34.31 Borate Fusion XRF
Sn, Tin (ppm) 197 38 168 227 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.265 0.009 0.258 0.271 Borate Fusion XRF
Zn, Zinc (ppm) 338 17 317 360 Borate Fusion XRF
LOI1000, Loss On Ignition @1000°C (wt.%) 1.80 0.344 1.57 2.03 Thermogravimetry
Ag, Silver (ppm) 1.12 0.138 1.04 1.21 4-Acid Digestion
Al, Aluminium (wt.%) 6.32 0.270 6.16 6.48 4-Acid Digestion
As, Arsenic (ppm) 5.58 0.90 5.05 6.10 4-Acid Digestion
Ba, Barium (ppm) 79 6.4 75 83 4-Acid Digestion
Be, Beryllium (ppm) 0.74 0.052 0.72 0.77 4-Acid Digestion
Bi, Bismuth (ppm) 6.67 0.79 6.04 7.30 4-Acid Digestion
Ca, Calcium (wt.%) 3.62 0.159 3.52 3.72 4-Acid Digestion
Cd, Cadmium (ppm) < 0.50 IND IND IND 4-Acid Digestion
Ce, Cerium (ppm) 18.4 1.22 17.3 19.5 4-Acid Digestion
Co, Cobalt (ppm) 20.6 2.4 18.8 22.3 4-Acid Digestion
Cr, Chromium (ppm) 28.9 3.5 26.5 31.3 4-Acid Digestion
Cs, Caesium (ppm) 219 24 192 245 4-Acid Digestion
Fe, Iron (wt.%) 23.02 1.455 21.97 24.06 4-Acid Digestion
Ga, Gallium (ppm) 246 7 241 251 4-Acid Digestion
Hf, Hafnium (ppm) 1.27 0.23 1.03 1.52 4-Acid Digestion
In, Indium (ppm) 0.95 0.10 0.86 1.04 4-Acid Digestion
K, Potassium (wt.%) 2.57 0.093 2.52 2.62 4-Acid Digestion
La, Lanthanum (ppm) 9.80 0.405 9.49 10.11 4-Acid Digestion
Li, Lithium (ppm) 128 12 117 139 4-Acid Digestion
Lu, Lutetium (ppm) 0.11 0.009 0.10 0.12 4-Acid Digestion
Mg, Magnesium (wt.%) 0.717 0.067 0.676 0.758 4-Acid Digestion
Mn, Manganese (wt.%) 0.324 0.015 0.315 0.334 4-Acid Digestion
Mo, Molybdenum (ppm) 254 21 238 269 4-Acid Digestion
Na, Sodium (wt.%) 0.691 0.025 0.674 0.708 4-Acid Digestion
Nb, Niobium (ppm) 15.0 1.7 13.5 16.4 4-Acid Digestion
Ni, Nickel (ppm) 14.9 1.9 13.7 16.0 4-Acid Digestion
P, Phosphorus (wt.%) 0.512 0.022 0.497 0.527 4-Acid Digestion
Pb, Lead (ppm) 7.72 1.19 6.90 8.53 4-Acid Digestion
Rb, Rubidium (ppm) 928 94 870 986 4-Acid Digestion
S, Sulphur (wt.%) 0.688 0.023 0.672 0.705 4-Acid Digestion
Sb, Antimony (ppm) 0.37 0.029 0.33 0.40 4-Acid Digestion
Sc, Scandium (ppm) 6.21 0.590 5.66 6.76 4-Acid Digestion
Se, Selenium (ppm) < 5.00 IND IND IND 4-Acid Digestion
Sn, Tin (ppm) 110 11 100 119 4-Acid Digestion
Sr, Strontium (ppm) 117 5 114 120 4-Acid Digestion
Ta, Tantalum (ppm) < 0.50 IND IND IND 4-Acid Digestion
Tb, Terbium (ppm) 0.30 0.03 0.25 0.34 4-Acid Digestion
Te, Tellurium (ppm) 0.32 0.06 0.24 0.40 4-Acid Digestion
Th, Thorium (ppm) 5.74 0.520 5.23 6.25 4-Acid Digestion
Ti, Titanium (wt.%) 0.154 0.006 0.149 0.158 4-Acid Digestion
Tl, Thallium (ppm) 5.51 0.75 4.76 6.26 4-Acid Digestion
U, Uranium (ppm) 8.34 1.18 7.34 9.34 4-Acid Digestion
V, Vanadium (ppm) 54 1.5 53 55 4-Acid Digestion
Y, Yttrium (ppm) 8.10 0.711 7.52 8.68 4-Acid Digestion
Yb, Ytterbium (ppm) 0.74 0.09 0.64 0.84 4-Acid Digestion
Zn, Zinc (ppm) 336 15 324 347 4-Acid Digestion
Zr, Zirconium (ppm) 46.4 6.9 40.4 52.4 4-Acid Digestion
Ag, Silver (ppm) 1.11 0.163 1.00 1.23 Aqua Regia Digestion
Al, Aluminium (wt.%) 4.16 0.194 4.04 4.29 Aqua Regia Digestion
As, Arsenic (ppm) < 6.00 IND IND IND Aqua Regia Digestion
Au, Gold (ppm) 1.07 0.049 1.03 1.11 Aqua Regia Digestion
Ba, Barium (ppm) 46.8 4.22 43.8 49.7 Aqua Regia Digestion
Bi, Bismuth (ppm) 6.57 0.78 6.03 7.10 Aqua Regia Digestion
Ca, Calcium (wt.%) 2.90 0.219 2.76 3.04 Aqua Regia Digestion
Cd, Cadmium (ppm) < 0.30 IND IND IND Aqua Regia Digestion
Ce, Cerium (ppm) 13.3 1.7 11.7 15.0 Aqua Regia Digestion
Co, Cobalt (ppm) 19.3 1.65 18.0 20.5 Aqua Regia Digestion
Cr, Chromium (ppm) 32.3 1.99 31.2 33.5 Aqua Regia Digestion
Cu, Copper (wt.%) 0.479 0.019 0.467 0.491 Aqua Regia Digestion
Fe, Iron (wt.%) 22.84 0.625 22.40 23.28 Aqua Regia Digestion
Ga, Gallium (ppm) 213 20 200 226 Aqua Regia Digestion
Hf, Hafnium (ppm) < 1.00 IND IND IND Aqua Regia Digestion
Hg, Mercury (ppm) < 5.00 IND IND IND Aqua Regia Digestion
In, Indium (ppm) 0.74 0.060 0.68 0.81 Aqua Regia Digestion
K, Potassium (wt.%) 2.07 0.077 2.02 2.11 Aqua Regia Digestion
La, Lanthanum (ppm) 6.02 0.93 5.13 6.91 Aqua Regia Digestion
Li, Lithium (ppm) 112 13 101 123 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.083 0.009 0.072 0.093 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.689 0.026 0.673 0.706 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.248 0.019 0.234 0.261 Aqua Regia Digestion
Mo, Molybdenum (ppm) 249 19 234 264 Aqua Regia Digestion
Na, Sodium (wt.%) 0.073 0.006 0.068 0.077 Aqua Regia Digestion
Nb, Niobium (ppm) 9.19 1.53 7.56 10.83 Aqua Regia Digestion
Ni, Nickel (ppm) 13.5 2.5 11.9 15.2 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.479 0.011 0.471 0.487 Aqua Regia Digestion
Pb, Lead (ppm) 5.92 0.69 5.36 6.48 Aqua Regia Digestion
S, Sulphur (wt.%) 0.683 0.026 0.664 0.702 Aqua Regia Digestion
Sc, Scandium (ppm) 5.26 0.62 4.80 5.72 Aqua Regia Digestion
Se, Selenium (ppm) 3.98 0.358 3.65 4.31 Aqua Regia Digestion
Sn, Tin (ppm) 85 4.7 81 89 Aqua Regia Digestion
Sr, Strontium (ppm) 45.3 4.8 41.6 49.0 Aqua Regia Digestion
Tb, Terbium (ppm) 0.27 0.05 0.20 0.34 Aqua Regia Digestion
Te, Tellurium (ppm) 0.29 0.04 0.25 0.33 Aqua Regia Digestion
Th, Thorium (ppm) 5.42 0.248 5.12 5.73 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.095 0.004 0.093 0.098 Aqua Regia Digestion
Tl, Thallium (ppm) 5.11 0.192 4.86 5.36 Aqua Regia Digestion
U, Uranium (ppm) 8.39 1.34 7.37 9.40 Aqua Regia Digestion
V, Vanadium (ppm) 51 2.5 49 53 Aqua Regia Digestion
Y, Yttrium (ppm) 7.84 0.378 7.50 8.17 Aqua Regia Digestion
Zn, Zinc (ppm) 311 16 300 321 Aqua Regia Digestion
Zr, Zirconium (ppm) 17.6 2.4 15.3 19.9 Aqua Regia Digestion
FeO, Iron(II) oxide (wt.%) 17.35 0.637 16.97 17.72 Acid Digestion Titration
MassRec, Mass recovered (wt.%) 20.80 0.482 20.44 21.16 Davis Tube Recovery
Fe3O4, Iron(II,III) oxide (wt.%) 17.95 0.446 17.60 18.29 Satmagan 135
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