In this episode of Fresh Thinking, Dr Gregory Zhang is joined by Ian Glacken, Executive Consultant at Snowden Optiro, to discuss the crucial role of grade control drilling and modelling.

Grade control may seem like a technical detail, but it sits at the very heart of every successful mining operation. From reducing risk and maximising value, to ensuring accurate sampling and modelling, Ian shares insights from decades of experience helping mines achieve better outcomes.

Whether you're a geologist, mining engineer, or simply curious about how mines make critical decisions, this episode explains why grade control matters and how to get it right.

Key moments: 0:00 – Introduction to the podcast and speakers 1:01 – Why grade control is essential for profitable mining 2:47 – Importance of sampling quality and timing 3:20 – RC drilling vs blast hole drilling: which is best? 4:42 – Underground grade control: diamond drilling and face sampling 6:01 – Common issues with face sampling and how to address them 7:30 – Choosing the right drilling method for your operation 8:27 – How geology influences grade control strategies 8:40 – The JORC Code and reporting requirements for grade control 10:34 – Why grade control isn't "ground truth" but still vital 12:14 – Final thoughts and takeaways

If you would like to contact Ian or Greg: [email protected]

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Fresh Thinking by Snowden Optiro is rapidly becoming the best mining podcast globally - you can find our podcasts on YouTube, Spotify, Apple Podcasts and most other podcast platforms.

Who we are: Snowden Optiro is a resources consulting and advisory group that provides independent advice, consulting and training to mining and exploration companies, their advisors and investors. We help mine developers to advance their projects, mining companies to improve their operations and their professionals, and investors to de-risk their investments by the provision of quality advice, training and software in the field of Mineral Resources and Mineral/Ore Reserves.

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