TN-101 PhotonAssay™ Measurement Performance for Gold on Ore Samples
For those who want to see how PhotonAssay™ compares to fire assay on real-world samples.
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What this note covers
Direct comparison of PhotonAssay™ and fire assay results across approximately 2,000 real ore samples from Australian and international gold mining operations, including drill core and reverse circulation materials
Validation of PhotonAssay™ against certified reference materials (CRMs), demonstrating an R² value of 0.9996 against certified gold grades
Impact of sample preparation and particle top-size (raw, 15 mm, 2–3 mm and 75 µm) on PhotonAssay™ measurement accuracy and sampling error
Repeatability error analysis showing that PhotonAssay™ on 500 g aliquots at 2–3 mm top-size delivers comparable or better sampling precision than standard 50 g fire assay aliquots
Sampling theory framework (Gy’s Theory of Sampling) applied to PhotonAssay™ data, demonstrating that larger sample mass reduces sampling variance by more than a factor of 3 compared to fire assay
