Application of PhotonAssay™ to Coarse-Gold Mineralisation – The Importance of Rig to Assay Optimisation
Why sampling — not assaying — is often the biggest source of error in coarse gold.
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What this note covers
Why a standard 30 g fire assay charge is statistically likely to misrepresent true gold grade in coarse gold mineralisation — and what PhotonAssay™’s 300–500 g non-destructive analysis does differently
How fundamental sampling error (FSE) is calculated and applied to protocol design across low and worst-case coarse gold scenarios
Four case studies covering protocol comparison (fire assay vs. PhotonAssay™), laboratory splitting methods, and heterogeneity calibration using duplicate series analysis and X-ray computed tomography
The importance of QA/QC — CRM selection, OREAS recertification implications, and duplicate pair analysis — in any PhotonAssay™ gold assay programme
Practitioner recommendations for rig-to-assay protocol design that meets JORC and NI 43-101 reporting requirements
