OREAS 612

OREAS 612 is a certified reference material produced from a rhyodacite host blended with Ag–Pb–Zn ores from the Bowdens deposit, a Pb–Zn concentrate, and a minor Au-bearing component from Frogs Leg.

The matrix reflects felsic volcanic host rocks carrying Ag–Pb–Zn mineralisation with trace Au, making OREAS 612 well-suited for calibration and quality control of multi-element geochemical methods used in exploration geochemistry, routine lab QA/QC, and metallurgical programs where both precious and base metals are monitored.

OREAS 612 has been characterized using the following methods:

• Gold via low level, 25-50g fire assay with AAS or ICP-OES finish
• Gold by aqua regia digestion (10-50g sample weight) with ICP-OES, ICP-MS or AAS finish
• Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion
• Full ICP-OES and ICP-MS elemental suites by aqua regia digestion

Certified values for applicable analytes are operationally defined for each method, with results under OREAS ISO 17034 scope of accreditation.