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* Corresponding author : jahidin_geofisika@uho.ac.id Tel.:+62­81­388­3535­48; fax: ­ Received: Dec 13, 2019. ; Accepted:May 20, 2020. DOI 10.25299/jgeet.2020.5.2.4247  Abstract The Konawe region is part of the Sulawesi Southeast Arm ophiolite belt where ultramafic rocks are dunite and peridotite. The formation of nickel deposits is closely related to the weathering process of ultramafic rocks as a source rock. Ultramafic rocks exposed to the surface will experience weathering which is influenced by many in the form of climate change, topography, and existing geological structures The weathering process in the source rock can influence variations in chemical elements and magnetic properties in laterite soil profiles. For example, the c could affect granulometry as well as the quantity of magnetic minerals in the soil. Condition of weathering of ultramafic roc (initial, moderate and advanced) can affect nick mineral is an indication of the lateralization process that occurs in ultramafic rocks and is carried out through petrographi analysis of thin cuts and polish cuts. Determination mineral serpentine. In this study, the determination of the weathering level of ultramafic rocks (initial, moderate, and continued) uses magnetic susceptibility parameter. A total o from different places and weathered levels were analyzed. The results of the research have shown that the magnetic susceptibility of ultramafic rocks in the study area varies, from susceptibility, magnetic minerals contained in ultramafic rock samples are hematite and geotite minerals. This means that the weathering level of ultramafic rock samples is the continued wea ultramafic rocks in the study area produces nickel laterite deposits with a nickel content of 1.65 0.42% in the saprock zone, and 0.20 ­ 0.51% in the basic rock

Analysis of Ultramafic Rocks Weathering Level in Konawe Regency, Southeast Sulawesi, Indonesia Using the Magnetic Susceptibility Parameter