OREAS 282 Au (13.70 ppm) carbonate

OR282_60g
Item: OR282_60g
Unit of measure: ea
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Additional Information:

Certified Reference Material (CRM) OREAS 282 was prepared from high-grade refractory gold ore from the Cortez Mine located in Lander and Eureka County, Nevada, USA. The mine is located on the Carlin Trend approximately 75 miles (120 km) southwest of Elko and is owned by Nevada Gold Mines (operated by Barrick).

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.

Thirty-one commercial analytical laboratories participated in the program to certify the elements shown below. The following methods were employed:

  • Gold by fire assay (15-40g charge weight) with AAS, ICP-OES or ICP-MS finish (31 laboratories);
  • Gold by x-ray photon assay on ~350g sample weights using 4 Chrysos PhotonAssay machines at 3 laboratories. Multiple rounds of data (comprising three or six replicates) were generated by different staff from 3 of the machines;
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion (up to 25 laboratories depending on the element);
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion (up to 25 laboratories depending on the element).

Download Certificate OREAS282

Download DataPack OREAS282

AnalyteCertified Value1SD95% CI Low95% CI HighMethod
Au, Gold (ppm)13.710.32713.613.82Pb Fire Assay
Au, Gold (ppm)14.050.25713.9314.17PhotonAssay
Ag, Silver (ppm)0.6110.0210.5820.644-Acid Digestion
Al, Aluminium (wt.%)2.950.1142.873.024-Acid Digestion
As, Arsenic (ppm)2328103226023954-Acid Digestion
Ba, Barium (ppm)1003971024-Acid Digestion
Be, Beryllium (ppm)0.930.0560.8614-Acid Digestion
Bi, Bismuth (ppm)0.930.050.90.974-Acid Digestion
Ca, Calcium (wt.%)17.470.9116.9218.014-Acid Digestion
Cd, Cadmium (ppm)1.080.0511.011.154-Acid Digestion
Ce, Cerium (ppm)36.91.8935.538.34-Acid Digestion
Co, Cobalt (ppm)3.80.2483.613.994-Acid Digestion
Cr, Chromium (ppm)32.56.329.1364-Acid Digestion
Cs, Caesium (ppm)8.240.38788.484-Acid Digestion
Cu, Copper (ppm)19.21.381820.34-Acid Digestion
Dy, Dysprosium (ppm)2.610.1212.472.754-Acid Digestion
Er, Erbium (ppm)1.460.0581.391.534-Acid Digestion
Eu, Europium (ppm)0.650.0320.60.714-Acid Digestion
Fe, Iron (wt.%)1.060.041.041.094-Acid Digestion
Ga, Gallium (ppm)7.150.4596.857.444-Acid Digestion
Gd, Gadolinium (ppm)3.050.1972.823.274-Acid Digestion
Hf, Hafnium (ppm)1.630.1411.471.784-Acid Digestion
Ho, Holmium (ppm)0.510.0310.470.544-Acid Digestion
In, Indium (ppm)0.0590.0040.0530.0664-Acid Digestion
K, Potassium (wt.%)1.850.0931.791.914-Acid Digestion
La, Lanthanum (ppm)20.51.4719.721.34-Acid Digestion
Li, Lithium (ppm)21.61.1620.722.44-Acid Digestion
Lu, Lutetium (ppm)0.190.0160.170.214-Acid Digestion
Mg, Magnesium (wt.%)3.390.1643.33.494-Acid Digestion
Mn, Manganese (wt.%)0.0250.0010.0250.0264-Acid Digestion
Mo, Molybdenum (ppm)13.50.5113144-Acid Digestion
Na, Sodium (wt.%)0.0650.0070.0620.0684-Acid Digestion
Nb, Niobium (ppm)5.730.3075.485.974-Acid Digestion
Nd, Neodymium (ppm)17.50.7316.818.14-Acid Digestion
Ni, Nickel (ppm)21.81.442122.74-Acid Digestion
P, Phosphorus (wt.%)0.0320.0020.030.0334-Acid Digestion
Pb, Lead (ppm)18.81.141819.54-Acid Digestion
Pr, Praseodymium (ppm)4.60.1744.454.754-Acid Digestion
Rb, Rubidium (ppm)12651231304-Acid Digestion
Re, Rhenium (ppm)0.0220.0020.0180.0264-Acid Digestion
S, Sulphur (wt.%)0.7170.0490.6860.7484-Acid Digestion
Sb, Antimony (ppm)15.20.8314.615.84-Acid Digestion
Sc, Scandium (ppm)3.940.2463.734.144-Acid Digestion
Se, Selenium (ppm)2.350.481.734-Acid Digestion
Sm, Samarium (ppm)3.330.1113.193.464-Acid Digestion
Sn, Tin (ppm)1.460.1121.361.564-Acid Digestion
Sr, Strontium (ppm)277132692864-Acid Digestion
Ta, Tantalum (ppm)0.40.030.370.434-Acid Digestion
Tb, Terbium (ppm)0.440.030.410.484-Acid Digestion
Te, Tellurium (ppm)0.230.030.190.284-Acid Digestion
Th, Thorium (ppm)5.360.225.175.554-Acid Digestion
Ti, Titanium (wt.%)0.1610.0070.1560.1654-Acid Digestion
Tl, Thallium (ppm)28.81.062829.64-Acid Digestion
Tm, Thulium (ppm)0.20.0060.190.214-Acid Digestion
U, Uranium (ppm)7.310.3567.067.564-Acid Digestion
V, Vanadium (ppm)10551011094-Acid Digestion
W, Tungsten (ppm)25.91.6224.9274-Acid Digestion
Y, Yttrium (ppm)16.60.81617.24-Acid Digestion
Yb, Ytterbium (ppm)1.310.0651.221.394-Acid Digestion
Zn, Zinc (ppm)12181151264-Acid Digestion
Zr, Zirconium (ppm)58753624-Acid Digestion
Ag, Silver (ppm)0.5770.0320.5410.612Aqua Regia Digestion
Al, Aluminium (wt.%)0.8150.0740.7750.854Aqua Regia Digestion
As, Arsenic (ppm)232013022462393Aqua Regia Digestion
Ba, Barium (ppm)29.82.3828.231.3Aqua Regia Digestion
Be, Beryllium (ppm)0.670.0440.610.73Aqua Regia Digestion
Bi, Bismuth (ppm)0.910.0260.880.93Aqua Regia Digestion
Ca, Calcium (wt.%)16.351.12615.6317.08Aqua Regia Digestion
Cd, Cadmium (ppm)1.090.0671.041.15Aqua Regia Digestion
Ce, Cerium (ppm)33.82.0832.335.4Aqua Regia Digestion
Co, Cobalt (ppm)3.610.383.373.86Aqua Regia Digestion
Cr, Chromium (ppm)23.81.7322.724.9Aqua Regia Digestion
Cs, Caesium (ppm)4.230.733.824.63Aqua Regia Digestion
Cu, Copper (ppm)18.61.4617.619.6Aqua Regia Digestion
Dy, Dysprosium (ppm)2.430.2032.222.65Aqua Regia Digestion
Er, Erbium (ppm)1.260.0721.181.34Aqua Regia Digestion
Eu, Europium (ppm)0.60.0540.530.67Aqua Regia Digestion
Fe, Iron (wt.%)0.9980.0420.9721.023Aqua Regia Digestion
Ga, Gallium (ppm)2.990.372.723.25Aqua Regia Digestion
Gd, Gadolinium (ppm)2.920.2262.713.13Aqua Regia Digestion
Ge, Germanium (ppm)0.1INDINDINDAqua Regia Digestion
Hf, Hafnium (ppm)0.350.0290.330.38Aqua Regia Digestion
Hg, Mercury (ppm)40.32.023941.6Aqua Regia Digestion
Ho, Holmium (ppm)0.450.0240.420.48Aqua Regia Digestion
In, Indium (ppm)0.0560.0060.050.061Aqua Regia Digestion
K, Potassium (wt.%)0.4120.0250.3990.426Aqua Regia Digestion
La, Lanthanum (ppm)18.21.2517.319.1Aqua Regia Digestion
Li, Lithium (ppm)12.30.6111.612.9Aqua Regia Digestion
Lu, Lutetium (ppm)0.150.0110.140.17Aqua Regia Digestion
Mg, Magnesium (wt.%)2.80.072.742.86Aqua Regia Digestion
Mn, Manganese (wt.%)0.0240.0020.0230.025Aqua Regia Digestion
Mo, Molybdenum (ppm)13.10.8312.613.6Aqua Regia Digestion
Nb, Niobium (ppm)0.170.050.130.21Aqua Regia Digestion
Nd, Neodymium (ppm)16.21.6114.617.9Aqua Regia Digestion
Ni, Nickel (ppm)211.919.822.3Aqua Regia Digestion
P, Phosphorus (wt.%)0.0310.0030.0290.032Aqua Regia Digestion
Pb, Lead (ppm)17.51.116.618.4Aqua Regia Digestion
Pr, Praseodymium (ppm)4.210.453.794.62Aqua Regia Digestion
Rb, Rubidium (ppm)393.8536.541.5Aqua Regia Digestion
Re, Rhenium (ppm)0.0240.0020.0210.026Aqua Regia Digestion
S, Sulphur (wt.%)0.7080.0560.6760.739Aqua Regia Digestion
Sb, Antimony (ppm)10.51.29.811.2Aqua Regia Digestion
Sc, Scandium (ppm)3.520.3243.313.74Aqua Regia Digestion
Se, Selenium (ppm)2.350.41.972.72Aqua Regia Digestion
Sm, Samarium (ppm)3.130.2842.863.4Aqua Regia Digestion
Sn, Tin (ppm)1.020.0940.941.11Aqua Regia Digestion
Sr, Strontium (ppm)21818208227Aqua Regia Digestion
Ta, Tantalum (ppm)0.01INDINDINDAqua Regia Digestion
Tb, Terbium (ppm)0.420.0320.390.44Aqua Regia Digestion
Te, Tellurium (ppm)0.240.030.220.27Aqua Regia Digestion
Th, Thorium (ppm)4.710.2324.534.9Aqua Regia Digestion
Ti, Titanium (wt.%)0.020.0020.0180.021Aqua Regia Digestion
Tl, Thallium (ppm)25.31.4624.426.3Aqua Regia Digestion
Tm, Thulium (ppm)0.170.0140.160.19Aqua Regia Digestion
U, Uranium (ppm)6.170.3355.916.43Aqua Regia Digestion
V, Vanadium (ppm)605.15763Aqua Regia Digestion
W, Tungsten (ppm)4.460.554.144.78Aqua Regia Digestion
Y, Yttrium (ppm)150.714.515.5Aqua Regia Digestion
Yb, Ytterbium (ppm)1.110.0551.041.17Aqua Regia Digestion
Zn, Zinc (ppm)1127108116Aqua Regia Digestion
Zr, Zirconium (ppm)121.61113.1Aqua Regia Digestion