#TITLE_ALTERNATIVE#

• Main Author: Fatatik Handayani, Nur
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29781
• Institution: Institut Teknologi Bandung

<p align="justify">Wadubura block with an area 11.07 km2 is the concession area of PT. Sumbawa Timur Mining (PT. STM) with gold and copper exploration prospects. The research area is located in Hu’u District, Dompu Regency, West Nusa Tenggara at UTM WGS 84 50S Zone 657402-660457mE and 9022056-9025723mN. Geomorphology of the research area is volcanic hill. The research area is characterized by steep hills that part of the volcanic hills and undergo of young to mature geomorphic stage based on river flow patterns and shape of valley in research area. <br /> <br /> Stratigraphy of the research area can be divided into four lithostratigraphic units from oldest to youngest: Tuff unit and Dacite A unit which formed during Early Miocene, Andesitic Lava and Dacite B units which formed during Middle Miocene. Secondary structures found in the research area are consisting of strike slip fault with NW-SE trend that formed after Middle Miocene. These strike slip faults are Oi Wou Strike Slip Fault, Nteko Strike Slip Fault, Wadubura Strike Slip Fault and Fo’o Krao Strike Slip Fault. <br /> <br /> Hydrothermal alteration was found within all lithology with weak-strong intensity range. Then the facies alteration within can be divided into 4 facies unit, based on mineral abundance and megascopic resemblance, there are: Clay Silica (kaolinite±quartz±montmorilonite), Silica Clay (quartz±kaolinite), Silica Alunite (quartz±alunite±kaolinite), and Massive Silica (quartz±chalcedony) with vuggy silica as special texture. The mineral assemblages indicate that alteration temperature is 150-300o C. The alteration zonation patterns that observed on the surface influenced by the trends of the faults and fractures which developed in the research area. The spatial association of structural patterns with alteration zones suggest that faults and fractures have acted as hydrothermal fluid pathways that controlled hydrothermal alteration zonations and mineralization in the research area. Mineralization which found locally was determined based on: alteration type, texture, and sulfide ore association as covellite-pyrite, and concluded that high sulfidation epithermal system was developed in the research area.<p align="justify">