Fig 1.
Geographical location of the study area in Southern Brazil.
Fig 2.
Retiro heavy mineral deposits, São José do Norte, Brazil.
Fig 3.
Flowchart of the methodology applied in this study.
Table 1.
Spectral information of ASTER bands used.
Fig 4.
Electron microscopy analysis: a) characteristic X-ray map with EDS 1050 detector, and b) composition spectrum of an ilmenite grain.
Fig 5.
Spectral signature of the heavy mineral sample obtained with Nicolet FT-IR 6700 and resampled spectral signature for the ASTER TIR bands.
Fig 6.
Rule and binary image (SAM) products showing Retiro heavy minerals deposit, Rio Grande do Sul, Brazil.
Fig 7.
Linear Spectral Unmixing classification image showing the quantification of heavy minerals in a sector (Retiro location) of the coast of Rio Grande do Sul.
Table 2.
The concentration of heavy minerals in the study area based on the application of the Spectral Angle Mapper and Linear Spectral Unmixing algorithms.
Table 3.
Validation of heavy mineral quantification with field sampling.