Environmental and Closure Benefits of Co-Disposal Integrated waste strategies provide several closure and environmental benefits: 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. Improved Landform Stability Blended materials often exhibit: • lower permeability, • increased compaction, • greater shear strength, • reduced susceptibility to erosion. These properties make co-disposal structures more robust over long time horizons. Integrated Closure and Smaller Footprint Depositing tailings and waste rock together reduces: • the total number of waste facilities, • land disturbance, and • long-term closure obligations. Combined waste deposits allow for streamlined rehabilitation, reducing soil cover requirements and improving landform performance. Role of Filtration in Future Integrated Waste Solutions Filtered tailings are increasingly recognized as a central enabler of engineered integrated waste strategies. The (Josic TMW2024) paper highlights how advances in filtration—automation, moisture control, throughput—allow more consistent and predictable tailings properties, which are essential for safe co-disposal implementation. Similarly, the (Leonida E&MJ 2020) article notes that next-generation pressure filters produce consistent, low-moisture cakes suitable for downstream handling, blending, and geotechnical design, making large-scale integrated waste approaches more feasible. Summary: Co-Disposal as a Complement to Filtered Tailings Co-disposal and co-mixing do not replace filtered tailings but extend their value: • Filtered tailings provide the essential fine, low-moisture component needed for engineered blends. • Co-disposal improves physical and geochemical stability beyond what filtered tailings or waste rock alone can deliver. • Integrated waste strategies reduce land footprint, lower closure costs, and enhance environmental performance.
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