OREAS 277 Au (3.391 ppm) siliceous shale

OR277_60g
Item: OR277_60g
Unit of measure: ea
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Additional Information:

OREAS 277 was prepared from a blend of high grade gold-bearing ore and barren sediments (shale, quartz and limestone). The ore was sourced from the Leeville Mine, located near the western crest of the Tuscarora Mountains, about 20 miles northwest of Carlin in Nevada, USA. Leeville is an underground high-grade refractory gold deposit located on the Carlin Trend. Gold mineralisation is hosted within decalcified and weakly to moderately silicified rocks composed of 60 to 70% quartz, 10 to 30% dolomite, 5 to 12% kaolinite, 2 to 4% illite and 2 to 4% pyrite (Jackson et al, 1997).
OREAS 277 is one of a suite of three Carlin ore CRMs available: OREAS 277: 3.39ppm (0.1opt); OREAS 278: 4.99ppm (0.15opt) and OREAS 279: 6.55ppm (0.19opt). OREAS 277 contains 72 certified values including C and S speciation and full ICP-OES and MS suites by aqua regia digestion.

Carlin-style gold mineralisation is known to be‘double-refractory’. The gold  particles are sub-microscopic and finely disseminated among a sulphide-rich matrix in the presence of carbonaceous material. Matching your standards to the matrix and mineralisation style of your field samples is very important, as a mismatch could result in low gold recovery.

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Download DataPack OREAS277

AnalyteCertified Value1SD95% CI Low95% CI HighMethod
Au, Gold (ppm)3.390.123.363.43Pb Fire Assay
C, Carbon (wt.%)1.860.0511.841.88Infrared Combustion
C-(Carbonate), Carbon as CO3.2- (wt.%)1.710.041.691.73Infrared Combustion
S, Sulphur (wt.%)0.6190.0430.6030.635Infrared Combustion
Ag, Silver (ppm)0.0930.0110.0890.098Aqua Regia Digestion
Al, Aluminium (wt.%)0.9230.0490.9040.941Aqua Regia Digestion
As, Arsenic (ppm)46723459475Aqua Regia Digestion
B, Boron (ppm)10INDINDINDAqua Regia Digestion
Be, Beryllium (ppm)0.330.050.310.36Aqua Regia Digestion
Bi, Bismuth (ppm)0.20.0160.20.21Aqua Regia Digestion
Ca, Calcium (wt.%)4.50.1864.434.57Aqua Regia Digestion
Cd, Cadmium (ppm)0.360.0290.350.37Aqua Regia Digestion
Ce, Cerium (ppm)28.21.6427.529Aqua Regia Digestion
Co, Cobalt (ppm)5.990.3725.836.14Aqua Regia Digestion
Cr, Chromium (ppm)27.81.5327.328.4Aqua Regia Digestion
Cs, Caesium (ppm)2.050.12522.11Aqua Regia Digestion
Cu, Copper (ppm)25.51.7424.926.2Aqua Regia Digestion
Dy, Dysprosium (ppm)1.510.0481.471.54Aqua Regia Digestion
Er, Erbium (ppm)0.660.0490.610.71Aqua Regia Digestion
Eu, Europium (ppm)0.550.070.470.62Aqua Regia Digestion
Fe, Iron (wt.%)1.80.0821.781.83Aqua Regia Digestion
Ga, Gallium (ppm)2.920.2232.823.02Aqua Regia Digestion
Gd, Gadolinium (ppm)2.180.1692.032.34Aqua Regia Digestion
Ge, Germanium (ppm)0.0540.0060.0480.06Aqua Regia Digestion
Hf, Hafnium (ppm)0.470.060.440.49Aqua Regia Digestion
Hg, Mercury (ppm)4.450.4334.254.66Aqua Regia Digestion
Ho, Holmium (ppm)0.260.0150.240.27Aqua Regia Digestion
In, Indium (ppm)0.0220.0020.0210.023Aqua Regia Digestion
K, Potassium (wt.%)0.3730.0230.3650.382Aqua Regia Digestion
La, Lanthanum (ppm)15.20.7914.815.5Aqua Regia Digestion
Li, Lithium (ppm)13.71.3513.114.3Aqua Regia Digestion
Lu, Lutetium (ppm)0.0790.0050.0750.082Aqua Regia Digestion
Mg, Magnesium (wt.%)1.270.0571.251.29Aqua Regia Digestion
Mn, Manganese (wt.%)0.0270.0010.0260.027Aqua Regia Digestion
Mo, Molybdenum (ppm)4.510.2534.414.61Aqua Regia Digestion
Na, Sodium (wt.%)0.0170.0050.0150.019Aqua Regia Digestion
Nb, Niobium (ppm)0.0770.0170.0660.088Aqua Regia Digestion
Nd, Neodymium (ppm)13.80.7413.214.5Aqua Regia Digestion
Ni, Nickel (ppm)20.11.3319.720.6Aqua Regia Digestion
P, Phosphorus (wt.%)0.050.0020.0490.051Aqua Regia Digestion
Pb, Lead (ppm)7.250.3667.087.42Aqua Regia Digestion
Pd, Palladium (ppb)10INDINDINDAqua Regia Digestion
Pr, Praseodymium (ppm)3.520.2373.323.72Aqua Regia Digestion
Pt, Platinum (ppb)5INDINDINDAqua Regia Digestion
Rb, Rubidium (ppm)26.82.0625.827.7Aqua Regia Digestion
Re, Rhenium (ppm)0.0030.0010.0030.003Aqua Regia Digestion
S, Sulphur (wt.%)0.6410.0380.6260.655Aqua Regia Digestion
Sb, Antimony (ppm)30.43.92931.9Aqua Regia Digestion
Sc, Scandium (ppm)2.60.1482.552.66Aqua Regia Digestion
Se, Selenium (ppm)0.70.170.60.79Aqua Regia Digestion
Sm, Samarium (ppm)2.570.1672.42.74Aqua Regia Digestion
Sn, Tin (ppm)0.930.10.890.98Aqua Regia Digestion
Sr, Strontium (ppm)562.85557Aqua Regia Digestion
Ta, Tantalum (ppm)0.01INDINDINDAqua Regia Digestion
Tb, Terbium (ppm)0.290.0290.270.31Aqua Regia Digestion
Te, Tellurium (ppm)0.130.030.120.14Aqua Regia Digestion
Th, Thorium (ppm)5.160.3774.995.33Aqua Regia Digestion
Ti, Titanium (wt.%)0.0350.0020.0340.036Aqua Regia Digestion
Tl, Thallium (ppm)6.880.5146.667.09Aqua Regia Digestion
Tm, Thulium (ppm)0.090.0080.0820.098Aqua Regia Digestion
U, Uranium (ppm)1.520.121.471.57Aqua Regia Digestion
V, Vanadium (ppm)31.52.9230.432.6Aqua Regia Digestion
W, Tungsten (ppm)2.10.331.952.25Aqua Regia Digestion
Y, Yttrium (ppm)6.860.4056.697.04Aqua Regia Digestion
Yb, Ytterbium (ppm)0.560.0450.510.61Aqua Regia Digestion
Zn, Zinc (ppm)533.45254Aqua Regia Digestion
Zr, Zirconium (ppm)15.21.5214.515.9Aqua Regia Digestion