ESTIMASI SUMBERDAYA BAUKSIT MENGGUNAKAN METODE GEOSTATISTIK DI PT. XYZ KABUPATEN MEMPAWAH PROVINSI KALIMANTAN BARAT

Abstract

XYZ is a mining company that is currently exploring bauxite ore in Mempawah Regency. Therefore, it is necessary to estimate resources to proceed to the production stage. The purpose of the study was to determine the distribution of grades, resource estimation based on Al₂O₃ grade classification, estimation of washed and unwashed bauxite resources and to classify bauxite resources based on Kriging Efficiency. This research uses Surpac 6.6.2 software with research methodology in the form of literature study, data collection, database, data validation, statistical analysis, model construction, resource estimation using Ordinary Kriging. At this research location, there are 114 test pit with an area of 15.4 ha with a distance between the test pit 50m and bauxite sampling is carried out at 2m intervals. Based on the direct exploration data of the test pit , the resource was calculated with a limit of 35% Al₂O₃ and a density of 1.8 ton/m3. From the results of the variogram processing, the distribution of homogeneity of Al₂O₃ tends to the southeast or towards quadrant IV 327.58o. The total tonnage of unwashed bauxite (UBX) is 487,388 tons and the total tonnage for washed bauxite (WBX) is 239,893 tons. Resources at the research site are classified based on Kriging Efficiency. The slag classification is 422,438 tons, indicated 160,875 tons, and measured 748,688 tons.

 Keywords: Bauxite, Ordinary Kriging, Resources