154 Figure 1 – Study area reference map, grid sample area, ASTER images used, geochemical stream sediment and rock location, geological units located, and RTP magnetic anomalies reclassified, Arequipa region ● ASTER Imagery: Forty-six spectral combinations were processed to map hydrothermal alterations (phyllic, argillic, propylitic) and specific minerals (alunite, kaolinite, among others) (OrigelGutiérrez & Cárdenas, 2010; Palomares et al., 2016). ● Geology: Weight values were assigned to cartographic units based on their mining potential (e.g., Quaternary deposits: 0; sedimentary: 2; volcanic: 3; metamorphic: 1; gabbro: 5; monzonite: 6; granite: 7; granodiorite: 8; tonalite: 9; diorite: 10; hydrothermal breccias: 11). ● Structures (Faults): Fault lines were converted into influence areas with buffers of 500, 1000, and 2500 meters, and assigned weights of 1, 0.5, and 0.2, respectively to represent decreasing structural control on mineralization, consistent with structural prospectivity (Ehmann, 1985).
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