CANMET-MMSL has established a team of experts in the area of sustainable mine waste management research to address industry challenges. Our objective is to develop and assess long-term, scientifically sound and sustainable options for mine waste disposal, management and rehabilitation. Our multi-disciplinary approach and wide range of resources enable us to assist Canadian mining companies at all stages of a mining project, from feasibility and planning through operation to final decommissioning.

CANMET-MMSL has developed a range of expertise through R&D; activities:

• Environmental assessment and water quality issues
• Development of innovative acidic drainage prediction methods
• Development and optimization of innovative lime treatment and sludge densification processes
• Metal recovery from acid mine drainage and mine waste
• Investigation and evaluation of alternative neutralization reagents

• Fresh water cover studies
• Benefits and risks of marine tailings disposal

• Development and evaluation of alternative sludge stabilization technologies
• Development and evaluation of sludge disposal technologies
• Revegetation options for lime sludge

• Contaminant transport and attenuation in the natural environment
• Evaluation of passive secondary covers
• Development of monitoring techniques/methods for contaminant transport across the water/tailings interface

• Decommissioning work in uranium mines at Elliott Lake related to acid mine drainage, mine rehabilitation and pathway analysis. This resulted in lower decommissioning costs and a reduction in potential environmental liabilities.

• Evaluation of sub-marine tailings disposal option in partnership with researchers in the Department of Fisheries and Oceans and the local university. This project involves studying the environmental impacts (chemical and ecotoxicological) of tailings disposed offshore at two abandoned mine sites. The objective is to provide scientific evidence on the advantages and disadvantages of marine tailings disposal.

• Alternative sludge characterization, acidic drainage treatment and sludge densification technologies to improve the long-term stability and storage of waste sludges. Most recently, the analysis of fresh and aged sludge samples from seven Canadian mines by synchrotron X-ray absorption spectroscopy has revealed detailed zinc speciation in the sludges. The information allows a better assessment of the long-term chemical stability of sludge deposits, and facilitates the design of appropriate decommissioning and alternative treatment strategies at individual sites.