Resource library

PhotonAssay™ Code “Compliance” Explained: JORC, NI 43-101 & PERC

Video

Dr. Simon Dominy explains how PhotonAssay™ fits within international reporting codes and what Competent/Qualified Persons need to know when using PhotonAssay™ data in public reporting.

Introduction to PhotonAssay™

Presentation

A clear introduction to how PhotonAssay™ works and what it changes in your mining project.

POV: What It’s Like to Be a Sample Inside a PhotonAssay™ Unit

Video

We put a camera inside a sample jar and ran it through a PhotonAssay™ unit. This is what it looks like from the inside. A unique point-of-view look at the PhotonAssay™ process - the conveyor, the irradiation chamber, the detection stage - experienced from exactly where the sample sits.

Introduction to PhotonAssay™ Video

Video

The mining industry has long relied on slow, hazardous, and destructive methods to measure gold, silver, and copper. PhotonAssay™ changes that. In this video, you will get a clear introduction to PhotonAssay™ - what it is, why it matters, and how it's already being used by leading miners across the globe.

How PhotonAssay™ Works Video

Video

From the moment a sample jar enters the unit to the delivery of a precise digital result - this is PhotonAssay™, step by step.

A Sample’s Journey Through PhotonAssay™ — Animated Walkthrough

Video

Follow a single sample - from sealed jar to final result - through every stage of the PhotonAssay™ process, visualised in full.

PhotonAssay™: A Review of Real-World Performance on Heterogeneous Gold Ores

Journal Article

A review of real-world PhotonAssay™ performance on heterogeneous gold ores — including coarse and nuggety mineralisation where conventional fire assay struggles most.

TN-403 Chrysos PhotonAssay™ Monitoring Standard Recommendations

Technical Resource

How PhotonAssay™ is monitored to maintain accuracy and reliability.

TN-401 QA/QC Procedures for Chrysos PhotonAssay™ Systems

Technical Resource

The QA/QC processes that underpin every PhotonAssay™ result.

TN-130 PhotonAssay™ Data Outputs

Technical Resource

Beyond the grade: understanding the data behind every PhotonAssay™ result.

TN-106 PhotonAssay™ Measurement Performance for Gold – Impact of U, Th, Ba

Technical Resource

For those who want to understand how PhotonAssay™ performs in the presence of U, Th, and Ba.

TN-101 PhotonAssay™ Measurement Performance for Gold on Ore Samples

Technical Resource

For those who want to see how PhotonAssay™ compares to fire assay on real-world samples.

TN-003 Chrysos PhotonAssay™ Measurement Performance for Precision Gold Services

Technical Resource

How PhotonAssay™ performs on known CRMs and blanks using our multi-cycle, non-standard gold services.

TN-001 Chrysos PhotonAssay™ Measurement Performance for Gold on Certified Reference Materials

Technical Resource

How PhotonAssay™ performs when tested against known gold CRMs.

PN-003 PhotonAssay™ Copper Services

Technical Resource

Commercially available PhotonAssay™ PA1408X assay services for copper.

PN-002 PhotonAssay™ Concurrent Gold and Silver Services

Technical Resource

Commercially available PhotonAssay™ PA1408X assay services for concurrent gold and silver.

PN-001 PhotonAssay™ Gold Services

Technical Resource

Commercially available PhotonAssay™ PA1408X assay services for gold.

PN-000 PhotonAssay™ Services Summary

Technical Resource

Commercially available PhotonAssay™ PA1408x assay services.

Chrysos PhotonAssay™ and International Code Compliance

Journal Article

For those navigating JORC, NI 43-101, PERC and what "compliance" actually means.

Как работает PhotonAssay™ (Russian)

Video

This video walks through the complete PhotonAssay™ process step by step in Russian. Как работает PhotonAssay™

Cómo Funciona PhotonAssay™ (Spanish)

Video

This video walks through the complete PhotonAssay™ process step by step in Spanish. Cómo funciona PhotonAssay™.

PhotonAssay™ User List

Journal Article

See which mining projects and companies around the world are using PhotonAssay™ data in their resource and reserve estimates and public disclosures.

Comment Ça Marche PhotonAssay™ (French)

Video

This video walks through the complete PhotonAssay™ process step by step in French. Comment ça marche PhotonAssay™.

PhotonAssay™ 工作原理全解析 (Mandarin)

Video

This video walks through the complete PhotonAssay™ process step by step in Mandarin. PhotonAssay™ 工作原理全解析.

PhotonAssay™ — Techniques and Workflows to Establish Fitness For Purpose

Journal Article

Most PhotonAssay™ vs fire assay comparison studies aren't designed to reach a rigorous conclusion. Rene Sterk and co-authors lay out exactly how to do it properly.

How Ravenswood Gold reduced assay costs

Case Study

Deploying PhotonAssay™ on-site transformed grade control enabling near real-time decision making while increasing reconciliation.

PhotonAssay™ 1408X System – Installation & Site Requirements Guide

Technical Resource

Detailed system drawings for those who want to see exactly how PhotonAssay™ is configured.

AN-001 Recommended CRM Gross Masses – Pulverised Materials

Technical Resource

The reference list of recommended gross masses for pulverised CRMs used with PhotonAssay™

PhotonAssay1408X Transport Information

Technical Resource

Everything you need to know about safely shipping, moving, and positioning a PhotonAssay™ 1408X system — from port to final installation.

Seeing the Unseen: The Challenges of Coarse Gold Sampling & Analysis

Video

What happens when the gold you can't see is the gold that matters most? Dr Simon Dominy, Dr Naomi Potter, and Dr James Tickner on why traditional assay methods may be under-reporting your grade.

PhotonAssay™ Precision & Accuracy at Low Grades

Video

How accurate is PhotonAssay™ when gold grades are low? In this focused technical conversation, Dr Naomi Potter, Dr Simon Dominy, and Dr James Tickner explore the topic of low-grade gold analysis, outlining why sample mass, not just instrument detection limit, is the real key to precision at the bottom end of the grade spectrum.

Improving Data Quality for Gold Miners with PhotonAssay™

Video

Can poor sampling decisions cost you your project? Dr Simon Dominy, Dr Naomi Potter, and Dr James Tickner on how assay precision and sampling strategy directly impact resource models, reconciliation, and project NPV.

If It Ain’t Broke: Rethinking Sampling & Analysis with PhotonAssay™

Video

Dr Simon Dominy, Dr Naomi Potter, and Dr James Tickner discuss the “if it ain’t broke, don’t fix it” mindset in gold assay practices, and explores how industry leaders are reassessing traditional sampling protocols in light of new opportunities.

GHD | SGS | Chrysos PhotonAssay™ – Emissions, Energy and Waste Assessment for Assay Technology

Journal Article

Zero hazardous waste. 90% less energy used. Zero Scope 1 emissions. See the difference for yourself.

Enhancing Gold Mine Efficiency and Safety Through the Implementation of Onsite PhotonAssay™

Journal Article

Read the full paper presented at World Gold 2025 in Denver — a detailed technical review of Ravenswood Gold Mine's transition to PhotonAssay™, including feasibility study data, precision comparisons against fire assay, and operational outcomes across grade control, exploration and metallurgical processing.

Introducción a PhotonAssay™ Webinar

Video

Nueva en la tecnología PhotonAssay™, o simplemente buscando una introducción clara. Este webinar explica cómo funciona, qué la hace diferente y por qué la industria minera la está adoptando en todo el mundo.

WI-023C Preparation of Pulverised CRM Jars

Technical Resource

How to correctly fill, tamp, and register CRM jars for use as PhotonAssay™ monitoring standards — including when and how to re-jar them.

Application of PhotonAssay™ to Coarse-Gold Mineralisation – The Importance of Rig to Assay Optimisation

Journal Article

Why sampling — not assaying — is often the biggest source of error in coarse gold.