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Nikel laterit adalah mineral logam hasil dari proses pelapukan dan pengkayaan mineral pada batuan ultramafik. Geologi di daerah Palangga, Provinsi Sulawesi Tenggara, disusun oleh batugamping dari Formasi Eimoko dan Formasi Langkolawa yang memiliki hubungan ketidakselarasan dengan batuan ultramafik di bawahnya sebagai pembawa endapan nikel laterit. Proses pelapukan pada batuan ultramafik menghasilkan karakter dan profil nikel laterit yang berbeda. Penelitian ini bertujuan untuk mengidentifikasi karakterisasi nikel laterit berdasarkan pada mineralogi dan profil dari Zona lateritisasi. Berdasarkan hasil penelitian diketahui bahwa jenis batuan pembawa nikel laterit di Daerah Palangga adalah harsburgit. Nikel laterit memiliki ketebalan sekitar 15 meter. Zona Limonit memiliki komposisi mineral lempung berupa kaolinit, mineral oksida berupa mineral magnetit, hematit, kromit dan mineral hidroksida berupa gutit. Kedalaman Zona Limonit yaitu sekitar 0 - 3 meter dengan kandungan Ni sekitar 0,76 – 1,78%, Fe sekitar 34,10 – 48,31%, dan SiO2 sekitar 9,42 – 18,02%. Zona Saprolit memiliki komposisi mineral silikat berupa kuarsa, garnierit, antigorit, enstatit, dan lisardit. Kedalaman Zona Saprolit sekitar 3 – 9 meter dengan kandungan Ni sekitar 1,79 – 2,98%, Fe sekitar 10,27 – 34,52%, SiO2 sekitar 22,0 – 49,63%. Batuan dasar (Bedrock) memiliki komposisi mineral silikat, antigorit, enstatit, olivin, augit dan lisardit. Kedalaman batuan dasar (bedrock) sekitar 9 – 10 meter dengan kandungan Ni sekitar 0,95 – 1,28%, Fe sekitar 7,62 – 8,29%, SiO2 sekitar 42,81 – 45,85%. Zona Saprolit merupakan Zona yang kaya akan nikel, dengan mineral penyusun berupa kuarsa, garnierit, antigorit, enstatit, dan lisardit. Nickel laterite is metal mineral formed by weathering and mineral enrichment of ultramafic rocks. Geology of Palangga area, Southeast Sulawesi Province arranged by limestone of Eimoko Formation and Langkowala Formation that have unconformity relation with ultramafic rocks as source of nickel laterite. Weathering process underwent ultramafic rocks resulted in different nickel laterite characters and their profile. The study aims to identify characterization of nickel laterite based on mineralogy and lateritization profile zones. Based on the result of study, source of nickel laterite in Palangga area is harzburgite. Nickel laterite profile has around 15 meters thick. Mineral composition of Limonite Zone is clay mineral as kaolinit, oxide mineral consisted of magnetite, hematite, chromite, and hidroksida mineral as goetite. Depth of Limonite Zone around 0 - 3 meters with Ni grade around 0,76 – 1,78%, Fe around 34,10 – 48,31%, and SiO2 around 9,42 – 18,02%. Mineral composition of Saprolite Zone is silicate mineral consist of quartz, garnierite, antigorite, enstatite, and lizardite minerals. Depth of Saprolite Zone around 3 – 9 meters with Ni grade around 1,79 – 2,98%, Fe around 10,27 – 34,52%, and SiO2 around 22,0 – 49,63%. Mineral composition of bedrock is silikat minerals consits of antigorite, enstatite, olivine, augit, and lizardite minerals. Depth of Bedrock ar ound 9 – 10 meters with grade Ni 1,28%, Fe around 7,62 – 8,29%, and SiO2 around 42,81 – 45,85%. The Saprolit Zone is a Zone that rich in nickel, with mineral composition is quartz, garnierite, antigorite, enstatite, and lizardite minerals.

Profil Endapan Nikel Laterit di Daerah Palangga, Provinsi Sulawesi Tenggara