This edition of Eksplorium contains five (5) research articles from various fields. The first paper describes uranium and Rare Earth Element (REE) characterization from Rirang uranium Deposits with titled “Distribution and Characteristics of Rare Earth Elements in Uranium-Ore Deposits from Rirang Area, West Kalimantan Province, Indonesia” The second paper is about identification of radioactive and REE in placer deposits with titled “Characterization of Radioactive and Rare Earth Elements in Heavy Minerals from River Sediments in Marau Region, Ketapang, West Kalimantan”. The third paper discusses about development method for geological structure identification titled “Geological Structure Identification Using GGMplus Satellite Gravity Data in The Area Surrounding Mount Tampomas”. The fourth paper is a study for land suitability analysis, with titled “Geology and Land Suitability Analysis for Final Processing Waste Site in Ambon Island”. The last paper is about the method validation for the determination of REE oxide with titled “Validation of The Gravimetry Method for Determining Rare Earth Elements Oxides”