Re-Evaluation of Uranium Resources in Batubulan Sector, Melawi, West Kalimantan
Abstract
Batubulan Sector, Melawi, has a relatively high occurrence of uranium. Several exploration activities have been conducted since 1973 in this region. The study is conducted by surface geological mapping, radiometric mapping, borehole logging, and resources estimation to determine the subsurface properties, geometry, mineralization direction, and speculative uranium resources in the Batubulan Sector. Based on these researches, the geology of the Batubulan Sector is composed of metamorphic rocks, metasedimentary rocks, and intrusive rocks with coarse and fine grain sizes. Uranium mineralization has been found in a spotted form in the veins with a maximum thickness of 10 cm and has a high radioactivity concentration of about 15,000 c/s. The lithologies of the study area consist of metapelites, quartzite, micro biotite, and meta-tuff. Drilling and borehole logging activities are conducted at four boreholes with a total depth of about 400 m and 75 – 120 m each. Based on resources estimation, the speculative resources of uranium (U3O8) in the Batubulan Sector are about 540 tonnes. It is necessary to conduct more advanced and more systematic exploration methods to estimate uranium resources in this area.
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DOI: https://doi.org/10.51835/iagij.2021.%25.1.3.348
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