OREAS 63

OREAS 63 was prepared from a blend of Ag–Au ore materials sourced from the Cerro Moro Mine, Santa Cruz Province, Argentina. The Cerro Moro material represents epithermal precious-metal mineralisation characterised by elevated silver and gold with minor associated base metals.

Twenty-one commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:

  • Gold by Pb collection fire assay (25-30 g charge weight) with AAS or ICP-OES finish
  • Gold by Pb collection fire assay (30 g charge weight) with gravimetric finish
  • Silver by Pb collection fire assay (10-30 g charge weight) with gravimetric finish
  • Silver by 4-acid (HNO3-HF-HClO4-HCl) digestion with AAS or ICP-OES finish

To confirm homogeneity, gold by instrumental neutron activation analysis (INAA) was undertaken on 18 x 85mg. This format enabled a nested ANOVA treatment of the INAA results to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 4.29 0.129 4.23 4.34 Pb Fire Assay
Ag, Silver (ppm) 220 10 212 228 Pb Fire Assay (Grav)
Au, Gold (ppm) 4.32 0.167 4.25 4.39 Pb Fire Assay (Grav)
Ag, Silver (ppm) 228 6 219 237 4-Acid Digestion
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