OREAS 21f
SKU: 21f
OREAS 21f has been prepared from quartz sand to which 0.5% iron oxide has
been added to produce a pinkish-tan coloured pulp. This colouring gives the
material an appearance of oxide origin (i.e., light orange-brown clay or light
iron ore colour). It is characterised by extremely low background gold of less
than 1 part per billion.Ten commercial analytical laboratories participated
in the program to characterise the elements reported below. The following
methods were employed:
Au by low level (1ppb reading resolution) fire assay with ICP-OES or
ICP-MS finish;
Full ICP-OES and ICP-MS elemental suites by 4-acid (HF-HNO3-HCl-HClO4)
digestion.
Specifications
- State: oxide
- Matrix: quartz
- Mineralisation: barren
- CRM Group: Blank/lithogeochem/low-level
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL High | Method |
|---|---|---|---|---|---|
| Au, Gold (ppb) | < 1 | IND | IND | IND | Pb Fire Assay |
| Ag, Silver (ppm) | < 0.050 | IND | IND | IND | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 0.099 | 0.008 | 0.093 | 0.105 | 4-Acid Digestion |
| Ba, Barium (ppm) | 4.58 | 1.32 | 3.40 | 5.76 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 0.061 | 0.019 | 0.053 | 0.069 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | < 0.010 | IND | IND | IND | 4-Acid Digestion |
| Cd, Cadmium (ppm) | < 0.020 | IND | IND | IND | 4-Acid Digestion |
| Ce, Cerium (ppm) | 1.79 | 0.172 | 1.69 | 1.88 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 0.41 | 0.05 | 0.40 | 0.43 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 5.39 | 0.98 | 4.46 | 6.32 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 0.090 | 0.005 | 0.086 | 0.094 | 4-Acid Digestion |
| Cu, Copper (ppm) | 4.90 | 0.51 | 4.54 | 5.26 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 0.350 | 0.019 | 0.337 | 0.363 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 0.22 | 0.04 | 0.19 | 0.26 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 0.20 | 0.02 | 0.19 | 0.22 | 4-Acid Digestion |
| In, Indium (ppm) | < 0.020 | IND | IND | IND | 4-Acid Digestion |
| K, Potassium (wt.%) | < 0.010 | IND | IND | IND | 4-Acid Digestion |
| La, Lanthanum (ppm) | 0.88 | 0.09 | 0.82 | 0.94 | 4-Acid Digestion |
| Li, Lithium (ppm) | 15.0 | 1.10 | 14.1 | 15.8 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | < 0.010 | IND | IND | IND | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.004 | 0.000 | 0.003 | 0.004 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 0.48 | 0.06 | 0.45 | 0.50 | 4-Acid Digestion |
| Na, Sodium (wt.%) | < 0.010 | IND | IND | IND | 4-Acid Digestion |
| Nb, Niobium (ppm) | 0.55 | 0.07 | 0.51 | 0.58 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 3.33 | 0.65 | 2.96 | 3.70 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | < 0.010 | IND | IND | IND | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 0.28 | 0.07 | 0.23 | 0.33 | 4-Acid Digestion |
| Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | 4-Acid Digestion |
| S, Sulphur (wt.%) | < 0.010 | IND | IND | IND | 4-Acid Digestion |
| Sb, Antimony (ppm) | 0.14 | 0.04 | 0.10 | 0.17 | 4-Acid Digestion |
| Se, Selenium (ppm) | < 1.00 | IND | IND | IND | 4-Acid Digestion |
| Sn, Tin (ppm) | 0.40 | 0.14 | 0.29 | 0.50 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 0.62 | 0.17 | 0.47 | 0.77 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | < 0.050 | IND | IND | IND | 4-Acid Digestion |
| Te, Tellurium (ppm) | < 0.050 | IND | IND | IND | 4-Acid Digestion |
| Th, Thorium (ppm) | 0.57 | 0.06 | 0.53 | 0.61 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.016 | 0.001 | 0.016 | 0.016 | 4-Acid Digestion |
| Tl, Thallium (ppm) | < 0.020 | IND | IND | IND | 4-Acid Digestion |
| U, Uranium (ppm) | 0.11 | 0.02 | 0.09 | 0.12 | 4-Acid Digestion |
| W, Tungsten (ppm) | 0.11 | 0.03 | 0.10 | 0.12 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 0.57 | 0.06 | 0.52 | 0.61 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 3.28 | 0.78 | 3.10 | 3.46 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 5.91 | 1.05 | 5.15 | 6.67 | 4-Acid Digestion |
Product Specifications
Certified Reference Values
| Analyte | Certified Value | Uncertainty (1SD) | 95% Confidence Low | 95% Confidence High | Method |
|---|---|---|---|---|---|
| Ce - Cerium (ppm) | 1.79 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 0.88 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 0.57 | - | - | - | 4-Acid Digestion |
SD = Standard Deviation | CL = 95% Confidence Limits
Methods: AR = Aqua Regia, 4-Acid = 4-Acid Digestion, LBF = Lithium Borate Fusion, FA/AAS = Fire Assay with Atomic Absorption, LECO = LECO Combustion Analysis
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