Identifikasi Zona Persebaran Profil Nikel Laterit Menggunakan Metode Electrical Resistivity Tomography (ERT) Dengan Korelasi Data Bor di Daerah "X"

Kurniawan, Achmad Dany (2026) Identifikasi Zona Persebaran Profil Nikel Laterit Menggunakan Metode Electrical Resistivity Tomography (ERT) Dengan Korelasi Data Bor di Daerah "X". Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Nikel merupakan salah satu logam strategis yang memiliki peran krusial dalam transisi energi global. Indonesia memiliki cadangan bijih nikel terbesar di dunia dengan jumlah mencapai 72 juta ton. Produksi nikel utama di Indonesia berasal dari nikel laterit yang banyak terdapat di Indonesia bagian timur. Profil nikel laterit terdiri dari beberapa zona yaitu limonite, saprolite dan bedrock. Salah satu tahap yang digunakan dalam eksplorasi nikel laterit adalah survei metode geofisika. Penerapan metode geofisika seperti Electrical Resistivity Tomography (ERT) dapat mengidentifikasi perbedaan nilai resistivitas bawah permukaan. Penelitian ini bertujuan untuk mengidentifikasi persebaran nilai resistivitas serta memodelkan persebaran ketebalan zona limonite dan saprolite. Penelitian dengan metode ERT ini mengaplikasikan konfigurasi Dipole – Dipole pada 8 lintasan ERT dengan 2 variasi panjang lintasan yaitu 235 meter dan 200 meter untuk mengetahui profil nikel laterit berdasarkan penampang 2D resistivitas bawah permukaan di daerah penelitian dan data bor sebanyak 10 data sebagai validasi interpretasi ERT. Berdasarkan hasil pengolahan data ERT klasifikasi sebaran nilai resistivitas untuk profil nikel laterit di daerah penelitian yaitu limonite (0 m – 90 m), saprolite (90 m – 400 m), bedrock (90 m – 1992 m). Hasil validasi interpretasi ERT dengan data bor menggunakan metode Mean Absolute Percentage Error (MAPE) adalah interpretasi ERT terhadap limonite bottom dan saprolite bottom memiliki persentase berturut-turut sebesar 32% dan 39% sehingga kedua hasil tersebut dikategorikan sebagai reasonable forecasting. Hasil visualisasi model 3D ketebalan zona profil nikel laterit dominan di daerah barat penelitian. Pada hasil peta persebaran ketebalan profil nikel laterit, lapisan limonite memiliki ketebalan rata-rata 3,7 meter dan lapisan saprolite memiliki ketebalan rata-rata 13,6 meter yang tersebar di daerah penelitian.
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Nickel is a strategic metal that plays a crucial role in the global energy transition. Indonesia holds the world’s largest nickel ore reserves, totaling 72 million tons. The majority of Indonesia’s nickel production comes from laterite nickel, which is abundant in eastern Indonesia. The laterite nickel profile consists of several zones: limonite, saprolite, and bedrock. One of the stages used in laterite nickel exploration is geophysical surveying. The application of geophysical methods such as Electrical Resistivity Tomography (ERT) can identify variations in subsurface resistivity values. The purpose of this study is to identify the distribution of resistivity values and to model the distribution of the thickness of the limonite and saprolite zones. This ERT study applied a Dipole – Dipole configuration across 8 ERT lines with two variations in line length 235 meters and 200 meters to determine the laterite nickel profile based on 2D subsurface resistivity cross-sections in the study area, using 10 borehole data points to validate the ERT interpretation. Based on the results of ERT data processing, the resistivity distribution for the laterite nickel profile in the study area is classified as follows: limonite (0 m – 90 m), saprolite (90 m – 400 m), and bedrock (90 m – 1992 m). The results of validating the ERT interpretation against borehole data using the Mean Absolute Percentage Error (MAPE) method show that the ERT interpretations of the limonite bottom and saprolite bottom have respective percentages of 32% and 39%, so both results are categorized as reasonable forecasts. Results of the 3D model visualization showing the thickness of the dominant lateritic nickel profile zone in the western part of the study area. In the distribution map of laterite nickel profile thickness, the limonite layer has an average thickness of 3.7 meters and the saprolite layer has an average thickness of 13.6 meters, distributed throughout the study area.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Nikel Laterit, ERT, MAPE, Laterite Nickel, ERT, MAPE
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN269 Prospecting--Geophysical methods
Divisions:	Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Achmad Dany Kurniawan
Date Deposited:	27 Jul 2026 01:06
Last Modified:	28 Jul 2026 09:08
URI:	http://repository.its.ac.id/id/eprint/137620

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