KAJIAN KADAR BAUKSIT DAN BESAR CADANGAN DI LOKASI TAMBANG BUKIT 12 MUNGGU PASIR, KABUPATEN SANGGAU, PROPINSI KALIMANTAN BARAT

Bauxite ore as a mineral contains mainly alumina (Al2O3) and can be found both in tropical and sub – tropical. Besides Alumina, major components of bauxite are silica, iron and titanium. The chemistry analysis of the bauxite percentage which uses the wet method, used to analyze the percentage of the bauxite major components. Whereas, the geometric method which uses the extended area method where test pit distance as a border for the influence area, used to analyze the amount of the bauxite reserve in the research area. The bauxite reserves consist of measured reserves (grid 25) and probable reserves (grid 100). This research is intended to analyze the percentage of the bauxite major components, the quality of the bauxite and the amount of the bauxite reserve. Based on the calculations can be known that the average of the bauxite major components is silica 4.47 %, iron 9.98 %, titan 0.71 %, alumina 47.59% and can be concluded that the bauxite quality is good. The amount of the bauxite reserves is 2001.69 (grid 25), 405.00 ton (grid 100) and 401.63 (correct counting).