Angkasa: Jurnal Ilmiah Bidang Teknologi
Vol 18, No 2 (2026): Mei

Pemodelan Kemenerusan Nikel Laterit Berdasarkan Metode Radial Basis Function (RBF) Di Blok X PT. Stargate Pasific Resources, Sulawesi Tenggara

Asep Bukhori (INSTITUT TEKNOLOGI NASIONAL YOGYAKARTA)
Rangga Bintang Ardaraja (Universitas Pembangunan Nasional Veteran Yogyakarta)
Winarti Winarti (Institut Teknologi Nasional Yogyakarta)
Al Hussein Flowers Rizqi (Institut Teknologi Nasional Yogyakarta)



Article Info

Publish Date
31 May 2026

Abstract

The significant nickel laterite deposits can be found in Indonesia, especially in the Sulawesi ophiolite belt, which was created by intricate tectonic processes. The purpose of this study is to use the Radial Basis Function (RBF) method to estimate the continuity of the supergene enrichment zone in Block X of PT. Stargate Pacific Resources, Southeast Sulawesi. Collar, survey, assay, and geological logging data from 118 drill holes make up the dataset, which was included into a three-dimensional (3D) modeling system. Leapfrog software is used for spatial modeling, geological and geochemical interpretation, data compositing, and top-cut analysis.The results show that the laterite profile is made up of limonite, saprolite, and bedrock zones, with nickel enrichment occurring primarily in the saprolite and somewhat in the limonite zone. The Ni grade distribution is heterogeneous with a positively skewed pattern, demonstrating the efficiency of the RBF method in capturing non-linear spatial variability when compared to traditional interpolation techniques. Furthermore, the model shows that the continuity of the supergene enrichment zone is primarily oriented west-northwest, as determined by plateau morphology, whereas thinner laterite profiles are associated with rolling hill areas due to greater erosion

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