<![CDATA[Rare earth element (REE) enrichment in the Bangka Belitung tin province occurs in genetically and technologically distinct materials that require different exploration and processing tests. This study develops an evidence-constrained framework that integrates fresh granite, weathered granite, placer/alluvium, and tin-processing residues without merging non-comparable geochemical values. The analysis separates primary accessory-mineral-hosted, residual mineral-grain, ion-exchangeable clay-associated, mechanically concentrated, and anthropogenically concentrated REEs. Site-specific datasets were evaluated by sample medium, analytical basis, mineral host, spatial support, process diagnosis, recovery evidence, and U-Th/NORM risk. Weathered profiles show systematic enrichment toward lower horizons: reported total REE concentrations increase from 156-188 to 196-268 ppm at Toboali and from 230-330 to 342-450 ppm at Air Gegas. Mineralogical studies identify monazite as the principal Ce-rich light-REE host and xenotime as a Y-heavy-REE host across primary, placer, concentrate, and tailings materials. Diagnostic leaching from South Bangka demonstrates that part of the REE inventory is extractable, but strong-acid recoveries cannot be generalized as evidence of low-intensity ion-exchange recovery. The ordinal screening assigns weathered granite the highest geological prospectivity but only moderate evidence confidence; tailings and placers remain attractive near-surface domains with greater heterogeneity and radiological uncertainty. Remote sensing is retained as a proxy for regolith, drainage, and disturbed ground, not as direct REE detection. The framework provides a reproducible basis for prioritizing field verification while preventing conceptual prospectivity from being misreported as a resource or economic valuation.]]>
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