T The research area is administratively located on Mount Subang, Jonggol District,Bogor Regency, West Java Province with an area of about 9km². This research coversthe analysis of various geological aspects such as landscape, stratigraphy and geologicstructure that developed, in the research area. And focuses on hydrothermal alterationstudies. The final results of this study are maps (geological map, geomorphology map,and track map, observation location and alteration zoning map) and research report.Geological research areas include geomorphology, stratigraphy, and geologicalstructure. Based on the analysis of topographic maps with field facts,geomorphologically the research area is grouped into 2 (two) geomorphological unitsbased on morphometry and its morphology genesis, namely Geomorphology Unit ofMount Borenges Intrusion Hills, Geomorphology Unit of Mount Borenges Slope. Thestudy area's Stratigraphy is composed of the Siltstone Unit with the Middle Miocene agewith the Middle-Lower Bathyal, and Andesite Intrusion Units comparable to AndesiteBreakthrough (a) Rocks with the final Miocene age. The geological structure of theresearch area in the form of Gunung Subang fault based on the classification of Rickardfault (1972) is a Normal Right Slip Fault.The hydrothermal alteration zones that can be found in the study area are dividedinto 2 zones according to their mineral assemblages, Carbonate - Chlorite - Epidote –Quartz Zone and Carbonate - Illit – Quartz Zone. Carbonate - Chlorite - Epidote –Quartz Zone is formed first, then Carbonate - Illit – Quartz Zone is formed thereafteralong with quartz vein mineralization process in the research area.Geologi dan alterasi daerah gunung Sumbang dan sekitarnya, kecamatan Jonggol, kab. Bogor, prov. Jawa baratDelova