A collaborative study with Gold Industry Group members Norton Gold Fields and Saracen Mineral Holdings on the integration of screening and particle sorting techniques is set to deliver benefits across the resources sector.
ISPS screen deck unit
ISPS Screen Deck on site trial
The Cooperative Research Centre for Optimising Resource Extraction (CRC ORE)’s Integrated Screening and Particle Sorting Collaborative (ISPS) Study began in August 2019, to develop a robust and scientifically rigorous framework for collecting, testing, and reporting results for integrated screening and particle sorting techniques in a variety of ore domains.
The 15 month study is currently underway across Western Australia at the Norton Gold Fields’ Paddington Gold Mine, the Saracen’s Carosue Dam Gold Mine and the BHP’s Cliffs Mine and expected to expand to include two additional sites.
An industry opportunity
CRC ORE ISPS Study Program Manager and Curtin University’s Western Australian School of Mines Discipline Lead - Metallurgical Engineering Dr Laurence Dyer said the opportunity existed to use particle sorting to upgrade ores.
“Trials have recently been conducted at several gold mining operations in the Goldfields region of Western Australia,” Dr Dyer said.
“What commonly fails to be taken into consideration is the benefit of first assessing the natural deportment of metal to a size fraction through grade-by-size screening test work, prior to undertaking particle sorting test work.
“Missing this step has two impacts. Firstly, there is a risk that particle sorting test results will be misinterpreted as being representative of the full sample without considering the mass balance impact of high-grade material that might have been lost in the fine fraction. This fine fraction will not be detected through the particle sorter,” he said.
“Secondly, the opportunity may exist to upgrade feed first through determining if there is a concentration of high grade to the fine (or coarse) fraction which can be separated through screening. Undertaking screening in the preparation stage of the particle sorting process will enable analysis and separation of the fine or coarse fractions of a rock mass,” he continued.
Furthermore, the study outcome would be a blueprint for understanding the opportunity for upgrading ore feed including an assessment of operational impacts, economic valuation and implementation approaches.
“BHP, Norton Gold Fields and Saracen will benefit from insights and improvements generated from other sites.
“CRC ORE will benefit from developing a broader understanding of the application and opportunity for applying particle sorting on a range of deposit types and integrating this with natural deportment grade-by-size screening opportunities to maximise value for mining operations,” Dr Dyer said.
ISPS value to industry
The ISPS study forms part of the CRC ORE Grade Engineering program, which is focused on extracting metal more efficiently by separating ore from waste before it enters comminution.
Current industry perception is that declining feed grade is an unavoidable consequence of ore deposit geology and mass mining technologies for increasingly mature mining operations.
Grade Engineering® is an integrated approach to coarse rejection that matches a suite of separation technologies to ore specific characteristics and compares the net value of rejecting low value components in current feed streams to existing mine plans as part of a system-view.
“Particle sorting is an important lever of Grade Engineering,” said Dr Dyer.
“Through this project CRC ORE is looking to develop a better understanding of the value of particle sorting to upgrade mill feed, particularly when combined with grade-by-size screening,” continued Dr Dyer.
The Grade Engineering program and the ISPS study will be conducted through CRC ORE’s Kalgoorlie-Boulder Mining Innovation Hub and Curtin University’s Western Australian School of Mines.
More information on the Kalgoorlie-Boulder Mining Innovation Hub can be found at kalhub.com, and detail on CRC ORE’s research can be found at crcore.org.au.