Mine to Tailing 4.0 represents a conceptual advance over both conventional tailings management and earlier integrated mine-to-process frameworks. Its distinguishing feature is the use of real-time ore characterization data—generated upstream at the mine face and in the crusher and grinding circuit feed—as the primary driver of adaptive control in the concentrator and tailings circuit. This approach transforms the tailings system from a passive recipient of concentrator outputs into an active, predictive element of the broader value chain management system (NapierMunn et al., 2005; Runge et al., 2019). The empirical results presented in Section 7 demonstrate that the productivity and environmental benefits of MT4.0 are not mutually exclusive: operations that achieved the greatest water recirculation rates and energy reductions (Cases B and D, dry stack configurations) also reported the largest TSF footprint reductions and longest life extensions—outcomes that directly reduce capital expenditure requirements and geotechnical risk simultaneously. This finding is consistent with broader evidence in the sustainable mining literature that environmental performance and operational efficiency are complementary rather than competing objectives when addressed at the system level (Edraki et al., 2014; Franks et al., 2014). The role of digital connectivity—through Metso's Sense instrument series and Metrics platform—emerges from the case evidence as a critical enabling factor. Operations that implemented real-time rheology and density monitoring in their tailings circuits achieved significantly more consistent thickener underflow density control than those relying on laboratory grab sampling, translating into more stable filter feed conditions, fewer filter press cycle interruptions, and ultimately higher water recirculation rates. This finding supports the broader argument for comprehensive instrumentation of tailings circuits as a prerequisite for achieving MT4.0 performance targets. 8.2 Limitations and Future Research The case evidence presented here, while drawn from documented Metso implementations, is limited to Latin American copper and gold operations—a geographically and commodityspecific sample. The applicability of MT4.0 performance targets to other ore types (e.g., iron ore, phosphate, coal), tailings mineralogies, and regulatory environments requires validation through additional implementations and independent research. The long-term geotechnical performance of high-density and dry stack TSFs under seismic loading and climate change-driven precipitation variability is an area of active investigation, and the case for MT4.0 will be strengthened as data from long-operating facilities become available. Future research should also quantify the social license value of MT4.0—the contribution of demonstrated water stewardship and TSF safety performance to reduced community conflict and improved regulatory relationships—in monetary terms that are accessible to corporate decision-makers. 9. CONCLUSIONS This paper has presented the Mine to Tailing 4.0 framework as a technically grounded, empirically validated approach to integrated tailings management that addresses the water, energy,
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