IDENTIFICATION OF ALTERATION ZONES OF EPITHERMAL GOLD DEPOSITS USING REFLECTANCE SPECTROSCOPY ANALYSIS AND MULTISPECTRAL IMAGE ANALYSIS IN CINEAM AREA, TASIKMALAYA REGENCY, WEST JAVA

• Main Author: Fakhri Khairo, Dzaki
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61956
• Institution: Institut Teknologi Bandung

Indonesia's need for metal commodities continues to increase. However, efforts to finding metal resources in Indonesia are still limited. The contribution of the mining industry to national development is needed. Thus, it is necessary to determine ore resources' existence and potential location. This study aims to determine the distribution of hydrothermal alteration zones associated with the presence of gold mineralization using remote sensing methods. For this, 21 samples were analyzed using reflectance spectroscopy and X-ray diffraction method to identify the mineral characteristics in the study area. Two multispectral satellite imagery data, Landsat 8 OLI/TIRS and Sentinel-2, were used to obtain the distribution of alteration zones. Hydrothermal alteration minerals were identified using band ratio, spectral angle mapper, and directed principal component analysis. Then, the alteration zone mapping results were correlated with the lineament data of the study area associated with a gold mineralized zone. This study indicates that the surface alteration that characterizes the gold mineralization zone is argillic alteration type, which is distinguished by kaolinite and illite minerals. It was found that the total gold mineralization potential zone in the study area is approximately 1,6 km².