#TITLE_ALTERNATIVE#

• Main Author: RYANTO SILALAHI (NIM : 12011026), BIOTER
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/26132
• Institution: Institut Teknologi Bandung

<p align="justify">Madadue district which have area 11,875 km2 belonging to concession of PT.Sumbawa Timur Mining with prospect on exploration of gold and copper. The <br /> research area characterized by steepest hills whicheas on Volcanic Hills Unit and have young geomorphic cycles based on patern of river flow dan shape of valley. Geology of research area have stratigraphy which consist of Tuff Unit, Lava Andesite A Unit, Lava Andesite-Tuff Unit, Lava Andesit B Unit, Pyroclastic Breccia Unit which form at Middle Miocene-Late Miocene then intruded by microdiorit stock. Deformation at Late Miocene formed shear fracture which developed fault with 3 pattern such as Rajo's sinistral normal fault with NNESSW trend, Kreo's and Saridi's fault with NE-SW trend and the last Kayumanis- <br /> Matimbi's fault and Kayumanis-Atiramba's fault with NW-SE trend. Locally, gash fracture founded as pyrite and sillica veins. This structures become feederzone have implication for formed alteration zone on wall rock with <br /> Pyroclastic Breccia and Lava Andesite B as impermable rocks. Based on study of paragenesis on the research area, mineralization consist of epithermal high sulfidation system (T <150o-340o C, pH < 2-4) which characterized by masive-vuggy sillica zone, sillica-alunite zone, alunite-pyrite zone with distribution followed NE-SW and NNE-SSW structures. Mineralization in this system have feature with presence enrichment of diseminated pyrite. Presence of poor pyrite and absence of enargite and tennantite-tetrahedrite in epithermal high sulfidation system show us that remobilization mineralization in this system. Remobilization processes in this system is characterized by presence of silica-kaolinite zone (T 40o-120o C, pH 3-4) which formed by NW-SE structures. After that, porphyry system (T 200o->340o C, pH 4-6) presence in <br /> epithermal high sulfidation system. Presence of porphyry system indicated mineralization recharge processes from hydrothermal alteration, which have alteration zone like biotite-magnetite zone, calcite-chlorite-actinolite±epidotequartz zone and illite-montmorilonite-magnetite zone. In this sytem, mineralization is characterized by presence of malachite and covelite as <br /> supergene mineral from copper. Result from NITON showing in porphyry system, grade of Cu > 0.2 %. Conceptual model of alteration and mineralization representation analysis of geological surface mapping, alteration zone map and paragenesis of alteration and mineralization. In south of the research area, conceptual model give information to have detail exploration for prospect of mineralization area.<p align="justify">