This edition of Eksplorium contains five (5) research articles from various fields. The first paper describes uranium and thorium distribution in tin belt granite with titled “Radioactive Mineral Distribution on Tin Placer Deposits of Southeast Asia Tin Belt Granite in Bangka Island.” The second paper is about empirical quiation to calculate the sediment thickness with titled “Empirical Equation between Predominant Frequency and Sediment Thickness in Plampang, West Nusa Tenggara”. The third paper discusses thorium separation from monazite, titled “Separation of Thorium (Th) from Monazite Sand of Bangka Island using Primene JMT Solvent Extraction Method”. The fourth paper is about the method validation for thorium ore analysis with titled “Analytical Method Validation of Thorium in Ore Sample Using Uv-Vis Spectrophotometer.” The last paper is a review paper about phytoremediation for nickel mine waste, with titled “Phytoremediation of Hexavalent Chromium Using Aquatic Plants in Nickel Mine Waste.”