Undervaluation of Water in Feasibility Studies Several economic studies—including (Gomez & Romo; Paste2024), Araya et al., and the integrated cost analyses by Carneiro—highlight that water and energy costs are often undervalued or externalised in early feasibility assessments. The paper “Use of real options to enhance water-energy nexus in mine tailings management” (Araya et al. Elsevier 2021) shows that tailings storage facilities are the biggest water sinks in mining, and that the true cost of water supply (especially desalinated or pumped water in arid regions) is frequently underestimated. When properly valued, filtered tailings can dramatically reduce operational water demand and energy consumption. The unified cost metric approach of (Cox et al. Elsevier 2022) reinforces that traditional reporting frameworks (e.g., NI 43-101) often fail to capture long-term costs, causing wet or semi-wet methods to appear more economical than they truly are. Regulatory Uncertainty and Approvals Complexity Despite global adoption of GISTM, many jurisdictions still lack clear regulatory pathways for filtered tailings, especially for: • dry-stack design criteria, • compaction verification, • seismic performance testing, and • progressive closure requirements. In some regions, filtered TSFs remain a “non-standard” design, requiring additional scrutiny, third-party reviews, and longer approval timelines. Operators may therefore default to thickened or slurry systems with more established permitting histories. Organizational Risk Aversion Filtered tailings represent a shift in operational culture and require new competencies in filtration, dry stacking, geotechnical monitoring, and materials handling. Operators are often more comfortable with conventional slurry systems, despite their higher long-term risks. Unfamiliarity with filter stacking’s operational requirements has slowed adoption, even when the technology offers clear safety advantages over conventional dams. Supply Chain Limitations As demand for filtration grows, supply chain constraints around: • filter press manufacturing lead times, • availability of specialized components (e.g., plates, membranes), • global maintenance and spare parts networks, and • skilled technical support can limit the speed at which mines adopt filtered systems. This challenge is specifically identified in Addressing the Barriers to Filtered Tailings, which highlights the need for robust supplier capability and global technical support frameworks.
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