Figure 5

Depiction of the general hydrothermal alterations using combinations of (a) ASTER, (b) Landsat 8, (c) Sentinel 2 and (d) ALI. Relative absorption band depth (RBD) results for highlighting (e) Alunite/Kaolinite/Pyrophyllite, (f) Al/Fe–OH, (g) Mg–Fe–OH and (h) Si–OH bearing rocks as bright pixels.