Mapping of gold-related alteration minerals and linear structures using ASTER data in the Giyani Greenstone Belt, South Africa

This paper focuses on the mapping of alteration minerals and linear structures associated with gold mineralization in Giyani Greenstone Belt (GGB). Spectral Information Divergence (SID) Linear Unmixing (LSU) classification algorithms were applied to ASTER data using image extracted endmember spectra which match spectral profiles predominant (biotite calcite) related GGB. Directional convolution filters also extract structural lineaments that may be mineralization. In addition, Fry analysis known occurrences GGB was conducted determine major distribution patterns along have occurred. LSU SID results show several pixels classified as corresponding occurrences. overlapping into gneissic rock, is a rare host study area. On other hand, high abundances calcite biotite generally confined within mafic-ultramafic greenstone rocks, been hypothesized source gold-mineralized fluids general, distinct broad regions previously reported these minerals. enabled extraction predominately NE-SW oriented structures, including shear zone revealed three patterns: N-S, NE-SW, ENE-WSW These correspond previous studies