Sandy Gray is co-founder and Technical Director of Gekko Systems, and is responsible for the Technical, Sales, and Research and Development teams. He has a background in mine management and over 35 years’ experience in mining and mineral processing operations, having invented his first jig at 17 years of age in the Curnamona Basin in South Australia.
A world leader in gravity gold and leaching flowsheets design, pre-concentration, polymetallics, materials handling and effective plant design, Sandy invented Gekko’s patented systems including the InLine Pressure Jig (IPJ), InLine Leach Reactor (ILR), G-Rex Resin Exchange and the Python Processing Plant. His inventions are breakthroughs in the field of mineral processing with over 600 installations at mines in 43 different countries over the last twenty years.
Sandy Gray is a recipient of the prestigious Clunies Ross Award, Australia’s pre-eminent award for scientists, technologists and innovators. Other awards he has received include the AusIMM Mineral Operating Technique Award, the Ernst & Young Entrepreneur of the Year Award (Technology, Communications, E-commerce & Life Sciences – Southern Region), the Victorian Premier’s Design Award in 2010 for the Python low height modular plant and received the Professional Excellence Award 2017 The AusIMM
In recent years Sandy’s main focus has been on improving plant economics incorporating technologies/flowsheets which focus on overall plant productivity improvements in energy, reagents, and maintenance/operations. He believes that to maximise the benefits of the new flowsheets it is necessary to have a completely integrated approach and possibly the most exciting transformation will come through the total downstream benefits of fine crushing up front for optimum liberation ahead of any further process.
Sandy’s career includes the introduction of intensive cyanidation for the recovery of gravity gold concentrates into the gold industry through the development of the InLine Leach Reactor. This technology is now used throughout the world in most gold mines with gravity circuits. Another achievement is the application of VSI (vertical shaft impact) technology to improve pre-concentration outcomes through a focus on liberation characteristics. This was used originally as a stop-gap for HPGR, but Sandy believes it will become a standard metallurgical tool for those trying to optimise liberation.
Sandy Gray is currently completing research and development into coarse liberation, resin thiosulphate and other environmental processing opportunities to further advance Gekko’s capabilities.