OREAS 600c reference material
Certified values
Au, ppm0.221
Cu0.058 %
ManufacturerOREAS
Packaging—
Values from the manufacturer's certificate. Exact tolerances (1SD, confidence intervals) are given in the certificate supplied with the pack.
What it is used for
Inserted into gold sample batches to check fire assay accuracy. A grade of 0.221 ppm suits QC of low-grade samples near cut-off. Certified copper checks the accuracy of copper and gold assays.
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