Specifications
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CRM State:
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Matrix:
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Mineralisation:
OREAS 62e was prepared from coarse reject splits of gold-silver ore samples from the Cracow mine located 500km northwest of Brisbane in Queensland, Australia. Cracow is a low sulphidation epithermal deposit hosted by meta-andesitic volcanics. High grade gold mineralisation occurs within fissure quartz veins and is associated with zones of silicification, present as quartz lode breccia and as quartz vein breccia.
Twenty-six commercial analytical laboratories participated in the program to characterise Au and Ag. The following methods were employed:
Analyte | Certified Value | 1SD | 95% Confidence Limits Low | 95% Confidence Limits High | Method |
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Au, Gold (ppm) | 9.13 | 0.410 | 8.97 | 9.30 | Pb Fire Assay |
Ag, Silver (ppm) | 9.86 | 0.342 | 9.73 | 9.98 | 4-Acid Digestion |
Au, Gold (ppm) | 9.37 | 0.620 | 9.04 | 9.69 | Aqua Regia Digestion |
S, Sulphur (wt.%) | 0.429 | 0.014 | 0.412 | 0.446 | 4-Acid Digestion |
Ag, Silver (ppm) | 9.86 | 0.365 | 9.71 | 10.01 | Aqua Regia Digestion |
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