Spatial Simulation Model of Bauxite Grades Using R Data Analysis: Its Implication for Exploration Activity

Abstract

In exploration, the investigation of prospective area encounters several barriers of land ownership, budget limitation, and exhausting permit procedures. To speed up the exploration activities of bauxite deposits and bauxite characteristics, grades of the gap areas should be simulated based on the available test pit data sets. This study aims to address the limitations and to optimize the exploration boundaries using the R project for statistical computation. R data analysis weaves the framework of kriging that required information from the adjacent data. This study utilizes the geochemical data of Al 2 O 3 , Fe 2 O 3 , SiO 2 , and TiO 2 from 296 test pit sampling points. The geochemical data used for R analysis were taken from bauxite horizon, while the other mineralogical properties were taken entirely from the exposed bedrock and test pit data. To verify the result of R analysis, recent data of the simulated area were used as a comparison. The R result shows the prediction value is slightly below the actual value of Al 2 O 3 . The kriging simulation of Al 2 O 3 was correlated with test pit and mineralogical characteristics of samples. This reveals the predicted value of simulation closely represents the true value of Al 2 O 3 grades. Extrapolation results of Fe 2 O 3 and RSiO 2 with regards to Al 2 O 3 grades suggest that higher grade of bauxite underwent desilication and deferruginization as evidenced by a high value of Index of Lateritization. It can be inferred that this attempt points out the advantages of a quick and reliable projection of bauxite laterite deposits from the limited parameters

Characteristics and Genesis of Laterite Bauxite in Sompak District and Surrounding Areas, Landak Regency, West Kalimantan

“…The lithology in the researched area consists of granodiorite, quartz diorite, biotite-hornblende granite, and tonalite. In comparison, the bauxite around the researched area in Tayan District, Sanggau Regency, West Kalimantan, is found in diorite, quartz monzodiorite, quartz diorite and microdiorite pyroxene (Nugraheni et al, 2022).…”

Genesis of Bauxite Ore in Toba Area Sanggau District, West Kalimantan Province

“…Bauxite in Indonesia is produced by the supergene enrichment of the Cretaceous peralkaline and alkaline igneous rocks (Nugraheni et al, 2021)…”