Remote sensing techniques applied for extracting an alteration zone associated with gold ore deposits in the greenstone, Brazil

It is indispensable for mineral exploration program that alteration zone which is closely related to the mineralization is clarified on its characteristics and is delineated from an investigation area. In this paper, Fazenda Brasileiro mine as a lode type of gold ore deposits pregnated in the greenstone was selected as a study area, aiming at extracting alteration zone, which is considered to be associated with primary alteration, around the ore body, by the use of remote sensing techniques. As the results, spectral analysis using field spectroradiometer against surface soils might be important tool for further exploration program in the preliminary stage. Through this spectral analysis, kaolinite, which is produced by weathering process, was focused as one of the indices showing wall rock alteration in this study area.