• Filtered tailings provide the highest water recovery and greatest reduction in reliance on large dams, but at the cost of higher direct CAPEX/OPEX and greater operational requirements for filtration and dry materials handling. • Co-disposal offers a powerful way to integrate tailings and waste rock management, potentially reducing land use and ARD risk, though at the cost of increased design and operational complexity. In subsequent sections, this paper will explore how these comparative attributes translate into life-cycle costs, ESG performance, and alignment with GISTM, and will examine how filtration technology advancements and water valuation can change the ranking between options at specific sites. Barriers to the Implementation of Filtered Tailings Filtered tailings have gained global momentum as a safer and more sustainable alternative to conventional slurry deposition, offering significant reductions in geotechnical and environmental risk, improved water recovery, and stronger alignment with regulatory expectations such as GISTM. However, widespread adoption remains constrained by several practical, economic, and organizational barriers. These challenges are well documented across the technical literature and Metso-authored papers, particularly Addressing the Barriers to the Implementation of Filtered Tailings and How to Make Filtered Tailings Feasible(Calil & Palmer; Paste 2026). This section outlines the most significant barriers from both an operator and supplier perspective. High Capital and Operating Costs A consistent finding across multiple studies—including Carneiro et al., is that filtered tailings systems typically require higher upfront investment than thickened or slurry alternatives. This includes capital for: • high-throughput pressure filters, • ancillary filtration equipment (cloth wash, compressed air, slurry feed systems), • conveyor or trucking systems for dry cake transport, and • compacted dry-stack construction. The CAPEX associated with filters alone can dominate early project estimates, particularly at large throughputs. Studies show that filtered tailings carry higher CAPEX and higher OPEX compared with thickened tailings, particularly for high-density operations. Lifecycle economic studies by Carneiro & Fourie show that although filtered systems may achieve long-term closure and water savings, their direct operating costs—including energy, maintenance, filter cloth consumption, and labour—remain higher than for thickened tailings or slurry systems under many scenarios. Lower-grade operations historically avoided filtration because the business case was weakened by OPEX and CAPEX concerns. Only with recent advances in filter capacity has this calculus begun to shift. Scalability in Large Operations Scaling filtration to throughputs above 50,000–100,000 t/d remains one of the most cited barriers. Large-scale filtration requires:
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