GEOLOGY AND TIN PLACER DEPOSITS RESOURCES ESTIMATION IN LAUT AIR KANTUNG, BANGKA DISTRICT

• Main Author: Hasanah, Arnisa
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/38756
• Institution: Institut Teknologi Bandung

Geology and tin placer deposits resources estimation in Bangka district are carried out to predict depositional environmental change based on the kind of sediments and its controlling factors and also to reconstruct sediments distribution model that contains cassiterite to calculate the number of tin resources and recommendation for the next exploration plan. Research was carried out at eight 5 – 31,5 meters thick sediments borehole spots along west to east section and eight rock samples around Laut Air kantung Beach. Sediment samples were analyzed using grain size distribution and Grain Counting Analysis (GCA) method. Rock samples were analyzed using petrographic identification.Grain size distribution analysis resulting five kind of sediments including gravel, sand, grey clay, brown clay and mud that shows the event of depositional environmental change from alluvial environment to sea environment caused by sea level rise. GCA results on sand fraction until gravel fraction show grade of each cassiterite, zircon, quartz, pyrite, tourmaline and ilmenite minerals. Combined sediment distribution model with GCA resulted about 882.298,86 kg estimation of tin resources in research area. Petrographic analysis shows that all samples are biotite granite which is S-type granite. The next expploration can be carried out at the northern part of research area since the main valley is interpreted to have continuity to the north.