107: Unlocking Gold - tackling refractory ores

In this Fresh Thinking episode, we're discussing one of mining's toughest technical challenges: refractory gold ores. Dr Tarrant Elkington, Snowden Optiro General Manager sits down with metallurgical expert Dr Leon Lorenzen to explore why some gold refuses to come quietly, and the high-stakes processing paths needed to recover it. From pressure oxidation to bioleaching and ultrafine grinding, this episode uncovers the costs, complexities, and future of refractory ore treatment. If you're a geologist, metallurgist, or investor—this one's essential listening. This podcast at a glance: 00:00 – Welcome & Introduction 00:45 – What is refractory gold? And why is it a problem? 02:30 – The role of geology and early detection 04:00 – How refractory ore impacts project economics 05:15 – Overview of processing methods: POX, BIOX, Albion, roasting 07:30 – How to choose the right processing path 09:00 – Real-world examples of refractory gold plants 11:00 – The future: centralised hubs and economic scale 12:30 – Final thoughts and advice for developers and investors If you'd like to connect with Tarrant and Leon: [email protected] This video podcast is also available as a video podcast on our Snowden Optiro YouTube channel: https://www.youtube.com/@SnowdenOptiro 🔔 Subscribe for more Fresh Thinking about the mining industry. 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. Find out more at: https://snowdenoptiro.com/ Professional Development courses: https://snowdenoptiro.com/professional-development/ #mineralprocessing #SnowdenOptiro #FreshThinking #gold #podcast