OREAS 273 Au (10.75 ppm) carbonate

OR273_60g
Item: OR273_60g
Unit of measure: ea
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Additional Information:

OREAS 273 was prepared from high-grade oxidised 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 notorious for its refractory nature. The significant presence of carbonaceous material impedes gold recovery by aqua regia digestion and cyanide leach methods. Matching your standards to the matrix and mineralisation style of your field samples as well as the analytical method used for sample analysis 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 OREAS273

Download DataPack OREAS273

AnalyteCertified Value1SD95% CI Low95% CI HighMethod
Au, Gold (ppm)10.760.33410.6410.87Pb Fire Assay
Au, Gold (ppm)11.030.24410.8811.18PhotonAssay
Ag, Silver (ppm)0.6460.0270.5960.6954-Acid Digestion
Al, Aluminium (wt.%)1.650.0971.61.714-Acid Digestion
As, Arsenic (ppm)121169116612554-Acid Digestion
Ba, Barium (ppm)44.32.2242.845.74-Acid Digestion
Be, Beryllium (ppm)0.540.0340.480.594-Acid Digestion
Bi, Bismuth (ppm)0.640.0330.610.674-Acid Digestion
Ca, Calcium (wt.%)19.431.22118.720.174-Acid Digestion
Cd, Cadmium (ppm)0.420.0280.370.464-Acid Digestion
Ce, Cerium (ppm)22.81.5421.723.94-Acid Digestion
Co, Cobalt (ppm)2.210.1392.072.344-Acid Digestion
Cr, Chromium (ppm)32.94.130.735.14-Acid Digestion
Cs, Caesium (ppm)3.050.1172.943.164-Acid Digestion
Cu, Copper (ppm)20.91.4819.722.14-Acid Digestion
Dy, Dysprosium (ppm)2.950.152.813.094-Acid Digestion
Er, Erbium (ppm)1.830.0971.741.924-Acid Digestion
Eu, Europium (ppm)0.560.0340.530.64-Acid Digestion
Fe, Iron (wt.%)0.7840.030.7640.8054-Acid Digestion
Ga, Gallium (ppm)4.450.354.194.714-Acid Digestion
Gd, Gadolinium (ppm)2.880.182.723.054-Acid Digestion
Ge, Germanium (ppm)0.140.030.10.184-Acid Digestion
Hf, Hafnium (ppm)0.90.0720.80.994-Acid Digestion
Ho, Holmium (ppm)0.630.0440.590.664-Acid Digestion
In, Indium (ppm)0.0350.0050.0280.0424-Acid Digestion
K, Potassium (wt.%)0.7780.0430.7530.8034-Acid Digestion
La, Lanthanum (ppm)18.71.2317.819.74-Acid Digestion
Li, Lithium (ppm)11.80.6411.212.44-Acid Digestion
Lu, Lutetium (ppm)0.220.0170.20.244-Acid Digestion
Mg, Magnesium (wt.%)5.190.2155.065.334-Acid Digestion
Mn, Manganese (wt.%)0.0410.0010.040.0424-Acid Digestion
Mo, Molybdenum (ppm)7.420.2797.187.664-Acid Digestion
Na, Sodium (wt.%)0.0310.0060.0290.0344-Acid Digestion
Nb, Niobium (ppm)3.820.2973.614.024-Acid Digestion
Nd, Neodymium (ppm)13.90.5913.314.64-Acid Digestion
Ni, Nickel (ppm)31.21.9129.632.74-Acid Digestion
P, Phosphorus (wt.%)0.1030.0050.10.1074-Acid Digestion
Pb, Lead (ppm)12.20.7511.612.84-Acid Digestion
Pr, Praseodymium (ppm)3.570.1643.373.784-Acid Digestion
Rb, Rubidium (ppm)593.157624-Acid Digestion
Re, Rhenium (ppm)0.0070.0010.0050.0094-Acid Digestion
S, Sulphur (wt.%)0.0490.0070.0460.0524-Acid Digestion
Sb, Antimony (ppm)26.71.0225.328.24-Acid Digestion
Sc, Scandium (ppm)40.2523.794.24-Acid Digestion
Se, Selenium (ppm)9.971.088.94114-Acid Digestion
Sm, Samarium (ppm)2.650.0812.512.794-Acid Digestion
Sn, Tin (ppm)0.970.0860.861.074-Acid Digestion
Sr, Strontium (ppm)321193093334-Acid Digestion
Ta, Tantalum (ppm)0.250.030.230.284-Acid Digestion
Tb, Terbium (ppm)0.450.0330.420.484-Acid Digestion
Te, Tellurium (ppm)0.210.030.170.254-Acid Digestion
Th, Thorium (ppm)2.940.1162.843.044-Acid Digestion
Ti, Titanium (wt.%)0.0840.0040.080.0884-Acid Digestion
Tl, Thallium (ppm)9.470.3639.129.834-Acid Digestion
Tm, Thulium (ppm)0.250.010.230.264-Acid Digestion
U, Uranium (ppm)6.220.3025.976.484-Acid Digestion
V, Vanadium (ppm)11161071154-Acid Digestion
W, Tungsten (ppm)10.50.491011.14-Acid Digestion
Y, Yttrium (ppm)24.91.1923.925.84-Acid Digestion
Yb, Ytterbium (ppm)1.570.0861.491.654-Acid Digestion
Zn, Zinc (ppm)46.43.6244.448.44-Acid Digestion
Zr, Zirconium (ppm)31.54.72834.94-Acid Digestion
Ag, Silver (ppm)0.5240.0430.5010.548Aqua Regia Digestion
Al, Aluminium (wt.%)0.5490.0560.520.579Aqua Regia Digestion
As, Arsenic (ppm)12156111821248Aqua Regia Digestion
Ba, Barium (ppm)25.12.3823.326.8Aqua Regia Digestion
Be, Beryllium (ppm)0.40.0230.370.43Aqua Regia Digestion
Bi, Bismuth (ppm)0.610.0240.590.63Aqua Regia Digestion
Ca, Calcium (wt.%)18.561.32817.7319.39Aqua Regia Digestion
Cd, Cadmium (ppm)0.420.0270.380.45Aqua Regia Digestion
Ce, Cerium (ppm)16.21.1515.317Aqua Regia Digestion
Co, Cobalt (ppm)2.240.32.052.43Aqua Regia Digestion
Cr, Chromium (ppm)22.11.942123.3Aqua Regia Digestion
Cs, Caesium (ppm)1.420.21.291.56Aqua Regia Digestion
Cu, Copper (ppm)20.51.8719.221.9Aqua Regia Digestion
Dy, Dysprosium (ppm)2.890.2412.653.12Aqua Regia Digestion
Er, Erbium (ppm)1.720.1171.611.83Aqua Regia Digestion
Eu, Europium (ppm)0.550.0370.50.6Aqua Regia Digestion
Fe, Iron (wt.%)0.7590.060.7260.791Aqua Regia Digestion
Ga, Gallium (ppm)1.750.221.581.91Aqua Regia Digestion
Gd, Gadolinium (ppm)2.830.2062.643.02Aqua Regia Digestion
Ge, Germanium (ppm)0.1INDINDINDAqua Regia Digestion
Hf, Hafnium (ppm)0.220.030.190.24Aqua Regia Digestion
Hg, Mercury (ppm)964.29399Aqua Regia Digestion
Ho, Holmium (ppm)0.60.0520.540.65Aqua Regia Digestion
In, Indium (ppm)0.0340.0040.0270.04Aqua Regia Digestion
K, Potassium (wt.%)0.2770.0230.2640.29Aqua Regia Digestion
La, Lanthanum (ppm)12.90.7412.313.5Aqua Regia Digestion
Li, Lithium (ppm)4.370.4274.094.65Aqua Regia Digestion
Lu, Lutetium (ppm)0.190.0140.170.2Aqua Regia Digestion
Mg, Magnesium (wt.%)4.870.1764.754.99Aqua Regia Digestion
Mn, Manganese (wt.%)0.0410.0030.0390.042Aqua Regia Digestion
Mo, Molybdenum (ppm)7.360.6177.017.7Aqua Regia Digestion
Nb, Niobium (ppm)0.110.020.090.14Aqua Regia Digestion
Nd, Neodymium (ppm)11.40.9210.512.3Aqua Regia Digestion
Ni, Nickel (ppm)30.42.428.832Aqua Regia Digestion
P, Phosphorus (wt.%)0.10.0110.0940.106Aqua Regia Digestion
Pb, Lead (ppm)12.11.1811.312.8Aqua Regia Digestion
Pr, Praseodymium (ppm)2.740.2292.512.97Aqua Regia Digestion
Rb, Rubidium (ppm)20.42.118.722.1Aqua Regia Digestion
Re, Rhenium (ppm)0.0070.0010.0050.008Aqua Regia Digestion
S, Sulphur (wt.%)0.0450.0090.0380.051Aqua Regia Digestion
Sb, Antimony (ppm)19.72.218.521Aqua Regia Digestion
Sc, Scandium (ppm)3.870.43.574.16Aqua Regia Digestion
Se, Selenium (ppm)8.970.7478.419.53Aqua Regia Digestion
Sm, Samarium (ppm)2.390.172.252.53Aqua Regia Digestion
Sn, Tin (ppm)0.60.080.530.67Aqua Regia Digestion
Sr, Strontium (ppm)30826296321Aqua Regia Digestion
Ta, Tantalum (ppm)0.01INDINDINDAqua Regia Digestion
Tb, Terbium (ppm)0.440.0330.410.47Aqua Regia Digestion
Te, Tellurium (ppm)0.20.040.180.23Aqua Regia Digestion
Th, Thorium (ppm)2.430.1282.282.57Aqua Regia Digestion
Ti, Titanium (wt.%)0.0080.0020.0060.009Aqua Regia Digestion
Tl, Thallium (ppm)7.520.777.087.96Aqua Regia Digestion
Tm, Thulium (ppm)0.230.0080.210.24Aqua Regia Digestion
U, Uranium (ppm)5.070.2834.875.27Aqua Regia Digestion
V, Vanadium (ppm)6065764Aqua Regia Digestion
W, Tungsten (ppm)5.120.4564.825.41Aqua Regia Digestion
Y, Yttrium (ppm)23.21.3222.324Aqua Regia Digestion
Yb, Ytterbium (ppm)1.410.131.31.53Aqua Regia Digestion
Zn, Zinc (ppm)42.93.141.344.6Aqua Regia Digestion
Zr, Zirconium (ppm)7.930.6527.448.41Aqua Regia Digestion