1338 These figures show that, to achieve economic viability in future replication projects, at least 30% of the CAPEX should be funded by local, regional, or national sources. Finally, it will be interesting to conduct a sensitivity analysis to identify which variables most affect the results. The sensitivity analysis was developed with TopRank 7.5 from Palisade Corporation (2016), and its results are presented in Figure 3. Figure 3 – Tornado graph of the Net present value (NPV) The sensitivity analysis reveals that the variables with the greatest impact on the project’s financial performance are the hourly hydrogen production rate and the hydrogen sale price, as these parameters directly determine revenue streams and cash flow. A second tier of influence is observed for the plant’s specific electricity consumption, the conditions of the power purchase agreement (PPA), and the facility's annual operating hours, followed by the depreciation period. In contrast, the remaining input parameters exhibit a comparatively marginal effect on the Net Present Value (NPV), indicating limited sensitivity of the economic results to variations in those variables. 6. DISCUSSION: IMPLICATIONS FOR POST-MINING RECLAMATION AND REVITALISATION From a reclamation and revitalisation perspective, the MINE-TO-H2 configuration demonstrates how post-mining assets can be recombined into an energy hub that produces multiple local value streams: decarbonised mobility, improved district heating efficiency, and knowledge creation for replication. The use of mine water as a raw material for electrolysis addresses ongoing pumping requirements in flooded mines by adding a productive outlet, potentially reducing dependence on alternative freshwater supplies.
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