University of Queensland Sustainable Minerals Institute (SMI) researchers are searching for partners in the local coal industry to help them trial a new technique for predicting the rate at which coal mine waste releases salt into the environment.
Following a two-stage project supported by ACARP, SMI’s Environmental Geochemistry Group are confident that new procedures and models to predict the rate at which salinity is generated and released from coal spoils will offer industry new insights into an often-neglected area of closure-planning.
Spoils are waste rocks produced by open-cut coal mining operations which consist of rock formations and soil cover overlying or interbedded with coal seams. They typically feature a high density of salt which is environmentally damaging if released in high concentrations.
Environmental Geochemistry Group Leader Associate Professor Mansour Edraki said the new modelling will ensure mining companies have a better understanding of their spoils.
“Dissolution of salts in rainfall and their subsequent transport into waterways can adversely affect water quality, potentially for decades following the cessation of mining,” Associate Professor Edraki said.
“The current modelling that informs closure and rehabilitation planning for spoil piles and voids, provides mine operators with uncertain information and may be overly conservative and expensive.”
“The methodology we have developed with the support of ACARP will equip them with more reliable, evidence-based predictions for the salinity loads of their spoil piles,” he said.
“While we have tested the modelling on spoils in natural conditions, we are now at the point where we want to advance to field trials, where conditions like water chemistry and volume are different.”
“Queensland has a world-leading approach to rehabilitation, and we are keen to collaborate with the state’s coal mining industry to advance techniques and knowledge around the rehabilitation and closure of spoils and final voids.”
Click here to watch ACARP Spoil Salinity research team member Karan Jain talk about the project.
To discuss potential collaborations opportunities, contact Associate Professor Mansour Edraki at m.edraki@cmlr.uq.edu.au or +61 7 3346 4060.