Project Economics Benchmark: PEA, PFS, and DFS Comparables with QA Filters

This benchmark organizes extracted PEA, PFS, and DFS economics into stage-aware comparables across after-tax NPV, initial capital, and after-tax IRR. Each row carries a linkage-confidence flag and passes sanity checks that catch implausible returns, mismatched units, and study-stage misclassification, so the comparison set holds up rather than averaging in bad data. Country and commodity cross-sections place each study against its peers, and a developer shortlist isolates the projects whose economics survive the filters.