Bauxite is one of the most mined ores in the world. Indonesia has approximately 1.2 billion tons of bauxite reserves or about 4% of the world’s bauxite reserves. Bauxite reserves in Indonesia can be found in West Kalimantan, especially in Ketapang Regency, which can be delineated in several locations including Labai, Sandai, Tayap and Air Upas. A total of 78,963 test pits have been conducted and covered 7 lithological units that are part of the Southern Schwaner Mountains. Most lithological units have bauxite with a concretion factor greater than 50%. The largest concretion factors and the highest Al2O3 content are bauxites derived from the Laur Granite and Spauk Tonalite. The bauxite with the lowest SiO2 and reactive silica content is formed from the Laur Granite. The Fe2O3 content in bauxites from the Ketapang Complex is above 12% and most of the bauxites have an average TiO2 of less than 1%. The same lithological unit in different areas has different chemical characteristics. In general, low land areas close to the coastline such as Air Upas and Labai have higher Al2O3, lower SiO2 and TiO2 content compared to hilly areas such as Sandai and Tayap. Detailed morphological studies at study area at BD9 hill in Sandai show that elevation and slope have a correlation with the thickness and chemical composition of bauxite.