OREAS 43P

The multi-element reference material OREAS 43P 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) 73 5 71 75 Pb Fire Assay
Cu, Copper (ppm) 438 27 422 454 4-Acid Digestion
Ni, Nickel (ppm) 502 44 476 528 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 9.59 0.170 9.47 9.71 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.055 0.004 0.052 0.058 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.428 0.017 0.438 0.418 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 25.01 0.380 24.74 25.28 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 2.14 0.100 2.07 2.21 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.950 0.030 0.970 0.930 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.083 0.007 0.079 0.087 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.180 0.069 0.130 0.230 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.086 0.016 0.076 0.096 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 57.42 0.310 57.24 57.60 Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.041 0.012 0.031 0.051 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.495 0.025 0.478 0.512 Borate Fusion XRF
LOI1000, Loss On Ignition @1000°C (wt.%) 3.46 0.430 3.20 3.72 Thermogravimetry
As, Arsenic (ppm) 111 17 105 117 4-Acid Digestion
Ba, Barium (ppm) 475 58 436 514 4-Acid Digestion
Mo, Molybdenum (ppm) 123 12 115 131 4-Acid Digestion
Pb, Lead (ppm) 146 15 140 152 4-Acid Digestion
W, Tungsten (ppm) 19.0 3.0 17.0 21.0 4-Acid Digestion
Zn, Zinc (ppm) 441 22 432 452 4-Acid Digestion
Au, Gold (ppb) 63 8 56 70 Aqua Regia Digestion
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