Conclusions & Recommendations The comparative assessment presented in this white paper demonstrates that no single tailings management strategy is universally optimal. Thickened, paste, filtered, and co-disposal approaches each provide benefits under specific geological, climatic, regulatory, and operational conditions. However, when tailings options are evaluated through a life-cycle lens that incorporates long-term risk, water efficiency, closure performance, ESG expectations, and regulatory alignment, filtered tailings consistently emerge as the most future-ready solution. Filtered tailings exhibit strong alignment with the objectives of the Global Industry Standard on Tailings Management (GISTM) and broader ESG frameworks. By minimizing retained water, eliminating large saturated impoundments, and improving geotechnical stability, filtered systems directly address the safety and consequence-reduction principles emphasized in contemporary tailings governance. Water efficiency represents a second decisive advantage. Analyses of the water–energy nexus demonstrate that filtered tailings achieve the highest process water recovery and the lowest long-term dependence on freshwater or desalinated supplies. Typical filtered cake moisture contents of approximately 10–20% allow most liberated water to be returned to the concentrator, a benefit that is particularly critical in arid jurisdictions such as Chile, where water scarcity and desalination costs strongly influence project viability. Closure performance and liability reduction further distinguish filtered tailings. Life-cycle cost studies consistently show that although filtered systems require higher initial capital investment, they significantly outperform slurry and thickened systems when closure and post-closure obligations are fully accounted for. The ability to progressively rehabilitate dry stacks during operations—through grading, capping, and revegetation—reduces residual liabilities and contrasts sharply with the perpetual care requirements often associated with wet impoundments. Importantly, many historical barriers to filtered tailings implementation have been substantially reduced. Advances in high-throughput pressure filtration, automation, modular plant design, and digital optimization have improved reliability, reduced moisture variability, and increased applicability to large-scale base-metal and iron ore operations. As a result, filtered tailings are no longer a niche technology but a technically mature option for a wide range of projects. Filtered tailings also enable integrated waste management strategies. Co-disposal and co-mixing studies demonstrate that filtered tailings provide an effective fine fraction for blended deposits, resulting in lower permeability, reduced oxygen ingress and acid rock drainage risk, improved geotechnical strength, and smaller land footprints. When evaluated using transparent, risk-adjusted financial frameworks that internalize closure, environmental, and failure consequences, filtered tailings frequently demonstrate superior long-term financial resilience compared with traditional wet options. Overall, filtered tailings deliver the most robust life-cycle performance when modern requirements for safety, water security, ESG alignment, closure, and long-term liability are considered. While alternative technologies remain appropriate in specific contexts, filtered tailings increasingly offer the strongest combination of sustainability, cost resilience, and regulatory alignment.
RkJQdWJsaXNoZXIy MTM0Mzk2