The influence of ore blending on mill throughput - Cortez mine case study

Speaker:  Dr Vladimir Jokovic, Senior Research Fellow, Julius Kruttschnitt Mineral Research Centre (JKMRC)

Abstract:  The concept of mine-to-mill was established by the JKMRC approx 40 years ago and is well-known worldwide as a route to increasing mill throughput through more intensive blasting as the feed becomes more competent. The JKMRC was invited by the management of the Barrick-Cortez mine site in Nevada, USA to work closely with site to address the challenges of processing the different ore types from the new Cross roads pit. The ore is far more competent than previously mined ore, leading to the expected reduction in mill throughput. But on top of this, both the harder and softer ore types had reduced throughput with different bottlenecks between the SAG and ball mill. To address this, the group planned systematic surveys of pure ores and controlled blends as recommended, based on the earlier phases of work. The survey outcomes which demonstrated the immediate production payback have helped the Cortez Metallurgical team to convince the mining group to implement the proposed blending strategy. The results of that work will be presented.

Bio: Vladimir Jokovic has been in Research & Development of novel processes and equipment for 15 years. His background includes experience in ore sorting, mineral classification and microwave technology. After completing his PhD studies at The University of Queensland, Vladimir has focused on the development of advanced technologies for the separation and upgrading of important minerals such as copper and nickel, with increased energy efficiency. Most recently, he has also been working on radically improving classification performances of semi-inverted hydrocyclones.
During his career, Vladimir has engaged with many mining companies such as BHP, Rio Tinto; Anglo American, Barrick Gold Corporation and supplier companies Weir, Metso-Outotec Gekko.