941 The Paper Tailing Mixing with Coarse Rejects document highlights that most co-disposal demonstrations originate from pilot-scale work and may not directly translate to large-scale operations without further validation. Large-scale blending requires: • robust process control, • continuous moisture management, • QA/QC systems for mix ratios, and • reliable bulk material handling. 7.4.2 Materials Handling Complexity Co-disposal demands synchronized delivery of two distinct waste streams. This requires coordination between: • filtration plant output, • mine haulage systems, • blending and mixing operations, and • deposition equipment. Moisture variability remains one of the most important factors to control, with studies showing blend quality deteriorates when cake is either too wet or too dry. 7.4.3 Equipment And Monitoring Requirements Co-disposal systems often require: • specialized mixing drums, hoppers, or blending conveyors, • geotechnical monitoring instruments, • real-time moisture sensing, and • operational protocols aligned with GISTM. These requirements add complexity but are increasingly manageable due to advances in mine automation and filtration consistency. 7.5 Environmental and Closure Benefits of Co-Disposal Integrated waste strategies provide several closure and environmental benefits: 7.5.1 Reduced Acid Rock Drainage (Ard) The Co-Mixing study confirms that tailings’ fine-grained matrix supports low oxygen diffusion and enhanced water retention. When used to encapsulate or blend with waste rock, the mixture significantly reduces ARD potential. This benefit is particularly important at sulphide-rich deposits. 7.5.2 Improved Landform Stability Blended materials often exhibit: • lower permeability, • increased compaction, • greater shear strength, • reduced susceptibility to erosion.
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