Tanah Bumbu County has the potential for natural resources in the form of andesite rocks. Andesite rock utilization is widely used in the construction sector, so an exploration method is needed to determine the presence of fresh andesite rock below the surface. The aim of this research is finding andesite rock potential in Tanah Bumbu County, South Kalimantan, Indonesia. To this purpose, measurement is conducted based on the Wenner configuration geoelectric resistivity method and obtaining the 2D cross-section model, analyzing the type of lithology and also the depth and thickness of andesite rocks in Bukit Baru Village, Tanah Bumbu County. Measurements are conducted on four tracks with a length of 270 m each and an electrode spacing of 10 m. Data processing is carried out using AGI EarthImager 2D and Surfer software. The results of identification of the 2D cross-section: three types of lithology layers, namely clay with a resistivity value of 10-45 Ωm, sandstone with 45-333 Ωm and andesite with 333-550 Ωm are found. The results of the 2D interpretation show that andesite which is at a depth of 1-67 m is characterized by a thickness of 4-42 m has a resistivity value of 333-550 Ωm.

Keywords: Tanah Bumbu county, andesite rock, Bukit Baru Village, Wenner configuration, resistivity method

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