Pengkayaan Unsur Tanah Jarang Sc- Y Pada Endapan Laterit Pulau Sebuku Provinsi Kalimantan Selatan

Abstract

Sebuku Island is located at the Maratus high physiography which has an ultramafic rock composition. Ultramafic rocks exposed on the surface will usually experience weathering caused by the influence of climate and rainfall such as on Sebuku Island. One of the products produced from the weathering of these ultramafic rocks is laterite deposits. Laterite contains ore minerals that have economic value including rare earth elements, especially Scandium (Sc) and Yttrium (Y). This study aims to determine the geological conditions, laterite characteristics, and the content of rare earth elements Scandium and Yttrium. The method used is a field survey using petrographic analysis, XRF (X-Ray Fluorescence), and ICP-MS (Inductively Coupled Plasma Mass Spectrometry). Based on the geomorphological analysis of the research area, there are two original forms, namely denudational origin, and fluvial origin, then this original form is divided into four landforms, namely weak undulating plains (D5), weakly wavy denudation (D6), lakes (F3). and Swamp (F4). The flow pattern that developed in the research area is Rectangular (R). The geological structure that develops in the study area is a fault with a general direction of Northwest-Southeast such as a left horizontal fault. Characteristics of laterite which has a thickness of 8-12 meters. Scandium (Sc) and Yttrium (Y) levels in the drill hole from the topmost layer from laterite (Limonite) to the bottom (Badrock), scandium are at 48-5.9 ppm and Yttrium levels are at 23-0.12 ppm and are richest in the lomonite zone.

Keywords: Enrichment, scandium and yttrium, laterite deposits