Table 2 – Integrated De-Risking Matrix for Tailings Reprocessing Projects Discipline Scoping (concept) (fatal flaw analysis) Pre-feasibility (PFS) (option selection) Feasibility (FS) (Execution / FID) Resource (The Asset) • Historical production records. • Topographic reconstruction. • Surface grab sampling. Output: Inferred Potential • Wide-spaced drilling (e.g., Sonic on 100m grid). • In-situ density measurements. • Initial 3D Block Model. Output: Indicated Resource • Tight-spaced drilling (e.g., Sonic on 25m grid). • Geostatistical Kriging (Short-range variability). • Reconciliation with pilot data. Output: Measured Resource Geotechnics (The Stability) • Visual site inspection. • Review of "As-Built" records. • Dam break inundation concept. Output: Hazard Classification • In-situ testing (CPTu, Vane Shear). • Vibrating wire piezometers. • Phreatic surface control concept. • Limit Equilibrium Analysis. Output: Prelim. Factor of Safety • Specialized lab testing program. • Seismic deformation modeling (2D/3D). • Liquefaction triggering analysis. • Active dewatering & drainage design. Output: Tailings mining criteria Metallurgy (The Process) • Literature review. • Theoretical mass balance. • Historical mill performance data. Output: Theoretical Recovery • Bench-scale composites. • Mineralogical analysis • Variability testing (Oxide/Sulfide). Output: Prelim. Flowsheet • Continuous Pilot Plant campaign. • Locked Cycle Tests. • Dewatering pilots (Paste/Filter). Output: Final Process Design Water & Geochem (The constraint) • Regional climate data review. • Static Acid Base Accounting (ABA). Output: Conceptual Water Balance • Static site water balance. • Hydrogeological conceptual model. • Humidity Cells (Kinetic start). Output: Water Supply Strategy • Probabilistic/Dynamic Water Balance. • 3D Groundwater flow modeling. • Solute transport modeling. Output: Effluent Management Plan Social and Closure (The Leagacy) • Land tenure verification. • Conceptual end-landform use. Output: Social Mapping • Environmental baseline initiation. • Stakeholder engagement plan. • Trade-off: Wet vs. Dry Closure. Output: Social License Strategy • EIA Submission & Social Agreements. • GISTM-compliant Closure Plan. • Post-closure monitoring design. Output: Final Investment Decision (FID)
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