OREAS 44P

The multi-element reference material OREAS 44P is a composite standard produced from a range of oxidised materials including Blackwood greywacke (central Victoria), Bulong laterite (Yilgarn, Western Australia), Iron Monarch hematite ore (Whyalla, South Australia) Hilton North gossan and Mount Oxide ferruginous mudstone (Mount Isa region, Queensland). The dominant constituent, a gold-bearing greywacke, was obtained from the flank of a mineralised shear zone within Ordovician flysch sediments in the Blackwood area of central Victoria. The sedimentary succession hosting the shear zone consists predominantly of medium-grained greywackes together with subordinate interbedded siltstone and slate. Hydrothermal alteration in the vicinity of the mineralisation is indicated by the development of phyllite. The shear zone, in which gold grades attain a maximum, is manifested by foliated sericitic and chloritic fault gouge and goethitic quartz veins. The very homogeneous distribution of gold on a mesoscopic scale and uniform concentration gradient away from the ore zone suggests the gold is extremely fine-grained and evenly disseminated.

Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Au, Gold (ppb) 67.0 5.80 65.0 69.0 Pb Fire Assay
Cu, Copper (ppm) 421 30 406 436 4-Acid Digestion
Ni, Nickel (ppm) 460 38 438 482 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 7.06 0.200 6.86 7.26 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.048 0.003 0.045 0.051 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.460 0.018 0.450 0.470 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 49.35 0.350 49.07 49.63 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 1.49 0.100 1.42 1.56 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.790 0.052 0.740 0.840 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.114 0.011 0.105 0.123 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.200 0.085 0.140 0.260 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.093 0.008 0.088 0.098 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 36.44 0.250 36.29 36.59 Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.042 0.011 0.034 0.050 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.350 0.032 0.328 0.372 Borate Fusion XRF
LOI1000, Loss On Ignition @1000 °C (wt.%) 2.99 0.150 2.87 3.11 Thermogravimetry
As, Arsenic (ppm) 105 17 95 115 4-Acid Digestion
Ba, Barium (ppm) 396 30 361 431 4-Acid Digestion
Mn, Manganese (ppm) 880 810 950 4-Acid Digestion
Mo, Molybdenum (ppm) 406 43 378 434 4-Acid Digestion
Pb, Lead (ppm) 210 15 202 218 4-Acid Digestion
S, Sulphur (ppm) 170 140 200 4-Acid Digestion
Ti, Titanium (ppm) 2100 1970 2230 4-Acid Digestion
W, Tungsten (ppm) 19.0 5.9 14.0 24.0 4-Acid Digestion
Zn, Zinc (ppm) 618 34 598 638 4-Acid Digestion
Au, Gold (ppb) 56.0 11.20 47.0 65.0 Aqua Regia Digestion
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