692 sampling to validate the basic business case. The critical question is not "how much money will we make?" but "is there a viable resource and a safe disposal solution?" • Pre-Feasibility (PFS): This stage marks the transition from historical data to site-specific data. It requires a preliminary drilling campaign to define the resource and geotechnical stability. Metallurgical testing moves from the beaker to the bench scale. The goal is to select the single best development case, reducing uncertainty to a range of ±20-30%. • Feasibility (FS): To support a Final Investment Decision (FID), uncertainty must be minimized to ±10-15%. For tailings, this necessitates a representative bulk sampling program and, crucially, pilotscale processing. Unlike a mine, where the ore body is fixed, a tailings project allows for engineering the feed (e.g., blending). The pilot plant validates that the proposed flowsheet works on the actual variable feed, not just a composite sample. To operationalize this structured process, we propose applying an "Integrated De-Risking Matrix." Table 2 presents a typical framework illustrating that engineering confidence must advance synchronously across all critical disciplines. While this matrix should be adapted to the site-specific context of each project, it provides a roadmap for conducting a comprehensive assessment, with uncertainty systematically reduced and risks mitigated across all engineering stages.
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