#TITLE_ALTERNATIVE#

• Main Author: KIKI FRANSISKUS (NIM : 12012060), EXTIVONUS
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27026
• Institution: Institut Teknologi Bandung

<p align="justify"> <br /> Wadubura block with an area of 14 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 coordinate 9021500 – 9025000 mN and 658000-662000 mE. The research area is characterized by steep hills that part of the volcanic hills and undergo of young geomorphic stage based on river flow patterns and the shape of valley in research area. Based on geological mapping, stratigraphy of research area consist of Early Miocene – Middle Miocene Crystal-Tuff Unit, Pyroclastic Breccia Unit, Andesite Lava Unit, and Lapilli-Tuff Unit, and intruded by Phreatic Breccia Unit and Dacite Intrusion Unit in the Late Miocene to Early Pliocene. Deformation in the Late Miocene had resulting two structural pattern, NW-SE and NE-SW. NW-SE pattern consist of Nteko-Parugajambu, Nteko, Karaba, Saki, and Wadubura normal fault, and Fo'o Krao strike-slip fault. NE-SW pattern at Sori Hiu thrust fault. These structures became feeder zone that form epithermal high sulphidation mineralisation characterized by Chlorite – Montmorillonite ± Calcite zone, kaolinite – Pyrite ± Calcite zone, Quartz – Kaolinite – Dickite zone, Quartz – Alunite zone, Vuggy Silica zone, Massive Silica zone, Steam-heated zone and then overprinted by porphyry mineralisation system that characterized by biotite – magnetite alteration zone. Mineralisation in the research area can be divided into three stage of mineralisation those are epithermal high sulphidation mineralisation system that characterized by pyrite abundance, porphyry mineralisation system that characterized by the presence of bornite, chalcopyrite, and magnetite, and the last is supergene enrichment with the presence of covelite and Fe-oxide minerals. The structural control in alteration in the research area reflected by the alteration zone pattern that follow NW-SE structural pattern and this is indicate that the acidity formation of alteration zone changes decreasing away from the structure zone. Mineralisation in the research area can be showed by positive anomaly of Cu, Mo, Zn, Pb, and As element that located adjacent to the structural zone. <p align="justify"> <br />