A Petrography Study of Bauxite of Kenco Area, Landak District, West Kalimantan Province Sitti Ratmi Nurhawaisyah (a), Nurliah Jafar (a), Sri Widodo (b*), Andi Artiningsih (c), Suriyanto Bakri (a)
(a) Department of Mining Engineering, Faculty of Industrial Technology, Universitas Muslim Indonesia 90231, Indonesia
(b) Mining Engineering Department, Faculty of Engineering, Hasanuddin University 90245, Indonesia
(c) Chemical Engineering, Faculty of Industrial Technology, Universitas Muslim Indonesia 90231, Indonesia
Lateritic bauxite are the products of intense weathering of rocks. It is largely controlled by bedrock type, time, climate (rainfall), and geomorphology. It is located in Kenco area, Landak district, West Kalimantan Province which the rest of the development of Cretaceous volcanism consisting of the island of Borneo Volcanic Formations Mensibau with unit members Granodiorite, quartz diorite and diorite, and the Formation of the Kingdom Volcanic Andesite-trachite units and Formations of alluvium and swamp sediment quarter. Petrography analysis was used for identifying source rock of lateritic bauxite. Rock samples were taken from fresh and weathering rock types which represented each different characteristic. The results of petrographic analysis showed that the source rock of the study area was granodiorite, granodiorite porphyry, gabbro porphyry and basalt porphyry. The main minerals in these rock types are orthoclase, plagioclase, and biotite. Direct observations in the field also support the results of the petrographic analysis that the source rock of the study area is diorite, granodiorite, diorite quartz and an indication of andesite intrusion.