Application of Remote Sensing Techniques in Identification of Lithological Rock Units in Southern Extension of Kolar Schist Belt from Chigargunta, Chittoor District, Andhra Pradesh to Maharajagadai, Krishnagiri District, Tamil Nadu

Remote sensing images have been widely and successfully used for mineral exploration for decades. Multi spectral remote sensing (LANDSAT+ and ASTER) image enhancement and interpretation proved to be useful tool in identification, detection, and delineation of lithological rock units and geologic structures associated with gold deposits. Though gold cannot be identified directly from satellite images, but the tonal variation indicate matching of hydrothermal alteration zones with the locations of known base metals (Cu, Zn, and Ni), thus manifesting the signatures for gold mineralization in the area. This technique has been applied to identify the lithological rock units, structural pattern, hydrothermal alternations, geological structures associated with auriferous sulphide deposits and vegetation in the study area viz. the southern extension of Kolar Green Schist Belt (KSB) from Chigargunta, Chittoor District. Andhra Pradesh to Maharajagadai. Krishnagiri District, Tamil Nadu. The composite images are produced based on known spectral properties of the rocks and alteration minerals in relation to the selected spectral bands. The analytical expertise is used to differentiate the tonal variation and comparing with standards and interpretation has been attempte