Mineralogical Study of Bauxite of Kenco Area, Landak District, West Kalimantan Province Nurliah Jafar (a), Sitti Ratmi Nurhawaisyah (a), Sri Widodo (b*), Citra Aulian Chalik (a), Andi Fahdli Heriansyah (a), Muhammad Hardin Wakila (a)
(a) Mining Engineering Department, Faculty of Industrial Technology, Universitas Muslim Indonesia 90231, Indonesia
(b) Mining Engineering Department, Faculty of Engineering, Hasanuddin University 90245, Indonesia
Bauxite is the result of weathering rocks which have high aluminum content, low iron content and little quartz content. The formation of bauxite deposits is controlled by source rock which is rich in Al element, tropical climatic conditions and geomorphological conditions that allow the formation of the accumulation of weathered source rock products. One of the perspective locations of bauxite deposits in Indonesia are in Kenco area, Landak district, West Kalimantan Province. The aim of this study was to determine the type of bauxite based on the mineral composition of bauxite. Mineralogical characteristics of bauxite were investigated by using XRD. Samples were taken from each horizon vertically in the test pit which represented each different characteristic including top soil, ore zone, clay and fresh rock. The results of X-Ray Diffraction (XRD) analysis reveals gibbsite as the major bauxitic mineral associated with kaolinite, goethite, titanium-rich anatase and quartz. Bauxite is classified as orthobauxite based on X-ray diffraction (XRD) with the appearance of minerals on each horizon. The mineral groups in the overburden horizon, bauxite ore horizon and clay horizon are alumina, iron, titanium, silicates, carbonates, sulfides, and sulfates, while the source rock mineral groups are iron, titanium, silicate, and sulfate. The distribution of bauxite deposits in the study area is generally found on the slopes that are not too steep.