A petrographic study of bauxite of Kenco area, Landak District, West Kalimantan Province

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. Bauxite deposits of Kenco area in Landak are investigated to determine the characteristics of rocks using petrographic analysis. Petrographic analysis aims to determine mineral content and type of source rock based on Travis classification (1955). The results of 15 thin sections showed that aluminum-bearing minerals consisted of orthoclase, plagioclase, and biotite which are the type of source rock are granodiorite, granodiorite porphyry, gabbro porphyry, and basalt porphyry based on Travis classification (1955).