Specifications
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CRM State:
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Matrix:
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Mineralisation:
OREAS 60c 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) | 2.47 | 0.082 | 2.44 | 2.50 | Pb Fire Assay |
Ag, Silver (ppm) | 4.87 | 0.223 | 4.78 | 4.96 | 4-Acid Digestion |
Au, Gold (ppm) | 2.45 | 0.114 | 2.40 | 2.51 | Aqua Regia Digestion |
S, Sulphur (wt.%) | 0.860 | 0.031 | 0.821 | 0.898 | 4-Acid Digestion |
Ag, Silver (ppm) | 4.81 | 0.296 | 4.68 | 4.93 | Aqua Regia Digestion |
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