OREAS 628 reference material

Certified values

Values from the manufacturer's certificate. Exact tolerances (1SD, confidence intervals) are given in the certificate supplied with the pack.

About the material

A blend of polymetallic ore from the Rosebery mine (Tasmania, Australia), barren rhyodacite and a little copper concentrate.

What it is used for

Inserted into gold sample batches to check fire assay accuracy. A grade of 0.868 ppm suits QC of typical ore-grade samples. Copper, zinc, lead and silver are certified too, so it suits QC of polymetallic ore assays.