STUDY ON THE MINERALIZATION OF TIN AND RARE EARTH ELEMENTS IN GUNUNG MUNTAI REGION BANGKA SELATAN REGENCY BANGKA BELITUNG ISLANDS PROVINCE

• Main Author: Ahmad Aminuddin, Amri
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/69841
• Institution: Institut Teknologi Bandung

Gunung Muntai is part of the tin belt in Southeast Asia and has potential sources of tin and rare earth elements. The study was conducted at 106°33'40"— 106°29'43" East Labor and 2°57'38"—3°00'18" South Latitude, South Bangka Regency, with an area of 21,02 km2. This study aims to determine the geological conditions, structure, mineralization and distribution of tin and rare earth elements in the research area. The morphology of the research area consists of intrusive hills and denuded plains, the geological unit consists of granite, and the structure develops in a southeast-northwest direction.. XRF analysis was carried out on granite and loose materials to determine the tin and rare earth elements distribution. Heavy mineral analysis was carried out on loose material to determine the minerals contained and carriers of tin minerals and rare earth elements. There are two geochemical analyzes, determination of anomaly values using statistical methods and ordinary kriging interpolation to determine the enrichment area of tin and rare earth elements in the study area. XRF results show that granite containing tin and rare earth elements is found in porphyritic granite located in the southeast to the center of the study area. High consentration of rare earth elements were also found in the aplite granite in the northern area of the study. Based on the heavy mineral analysis, the minerals that carried tin is cassiterite while the rare earth elements were carried by the minerals monazite and xenotime. The results of the analysis showed that the anomaly value of tin is 616,6 ppm, cerium is 316 ppm, and yttrium is 51,04 ppm. The anomaly areas of tin are located in the south, southeast to central, northeast and northwest areas, while the anomaly areas of rare earth elements are located in the southeast, south and northwest of the study area. The anomalous areas of tin and rare earth elements are found in greisen, pegmatite, and residual deposit. The anomaly area is influenced by the geological structure indicated by its distribution which is parallel to the dominant structural pattern, that is SE—NW