Nugraheni, Rosmalia Dita, Dedi Sunjaya, Bronto Sutopo, Mohammad Apriniyadi, Cahyaningratri Prima Riyandhani, and Imam Setiaji Ronoatmojo. 2022. “Spatial Simulation Model of Bauxite Grades Using R Data Analysis: Its Implication for Exploration Activity”. Indonesian Journal on Geoscience 9 (3):337-53. https://doi.org/10.17014/ijog.9.3.