OREAS 258 reference material
Certified values
Au, ppm11.15
Ag, ppm1.72
Material typeOxide gold ore
ManufacturerOREAS
Packaging—
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 oxide gold ore (Andy Well project, Western Australia) with barren sedimentary rocks and basaltic scoria.
What it is used for
Inserted into gold sample batches to check fire assay accuracy. A grade of 11.15 ppm suits QC of very high-grade samples and dilution checks. Certified copper checks the accuracy of copper and gold assays.
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