Identifikasi Persebaran Nikel Laterit Menggunakan Metode Ground Penetrating Radar di Kolaka, Sulawesi Tenggara

Arubusman, M Pradipta (2026) Identifikasi Persebaran Nikel Laterit Menggunakan Metode Ground Penetrating Radar di Kolaka, Sulawesi Tenggara. Other thesis, Insitut Teknologi Sepuluh Nopember.

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Abstract

Kebutuhan industri akan informasi persebaran dan kedalaman endapan nikel laterit yang akurat menjadi penting dalam kegiatan eksplorasi karena keterbatasan metode pengeboran yang memerlukan waktu dan biaya besar. Oleh karena itu, penelitian ini menggunakan metode geofisika non-destruktif, yaitu ground penetrating radar (GPR) untuk memetakan persebaran nikel laterit berupa lapisan limonit, saprolit, dan bedrock yang dikorelasikan dengan data bor, serta menguji ketelitian hasil interpretasi menggunakan Mean Absolute Percentage Error (MAPE) di daerah penelitian. Penelitian ini menggunakan 15 lintasan GPR dengan 14 titik data bor sebagai data validator. Akuisisi data dilakukan menggunakan perangkat UltraGPR RTK-DGPS berfrekuensi 30 MHz, kemudian diolah melalui tahapan dewow filtering, bandpass filtering, background removal, FK-filtering, gain, dan koreksi topografi. Hasil interpretasi menunjukkan tiga lapisan utama, yaitu lapisan limonit dengan ketebalan 0–15 m, lapisan saprolit dengan ketebalan 5–35 m, dan lapisan bedrock pada kedalaman 13–35 m. Variasi ketebalan dan kedalaman lapisan laterit dipengaruhi oleh faktor morfologi, topografi, dan tingkat pelapukan diferensial. Hasil evaluasi MAPE menunjukkan tingkat ketelitian yang sangat baik, dengan nilai MAPE sebesar 11,75% pada batas bawah limonit dan 7,53% pada batas bawah saprolit pada velocity 0,07 m/ns. Hasil penelitian ini menunjukkan bahwa metode GPR efektif digunakan untuk pemetaan persebaran dan kedalaman nikel laterit serta dapat menjadi metode pendukung dalam kegiatan eksplorasi nikel laterit. ====================================================================================================================================
The industry's need for accurate information on the distribution and depth of laterite nickel deposits is important in exploration activities due to the limitations of drilling methods, which require significant time and cost. Therefore, this study uses a non-destructive geophysical method, namely ground penetrating radar (GPR), to map the distribution of laterite nickel in the form of limonite, saprolite, and bedrock layers correlated with drilling data, and to test the accuracy of the interpretation results using Mean Absolute Percentage Error (MAPE) in the study area. This study used 15 GPR traverses with 14 drill data points as validators. Data acquisition was performed using a 30 MHz UltraGPR RTK-DGPS device, then processed through dewow filtering, bandpass filtering, background removal, FK-filtering, gain, and topographic correction stages. The interpretation results showed three main layers, namely a limonite layer with a thickness of 0–15 m, a saprolite layer with a thickness of 5–35 m, and a bedrock layer at a depth of 13–35 m. The variation in the thickness and depth of the laterite layer was influenced by morphological, topographical, and differential weathering factors. The MAPE evaluation results show a very good level of accuracy, with a MAPE value of 11.75% at the limonite bottom and 7.53% at the saprolite bottom at velocity 0,07 m/ns. The results of this study indicate that the GPR method is effective for mapping the distribution and depth of laterite nickel and can be a supporting method in laterite nickel exploration activities.

Item Type:	Thesis (Other)
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN269 Prospecting--Geophysical methods
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	M Pradipta Arubusman Arubusman
Date Deposited:	28 Jan 2026 04:12
Last Modified:	28 Jan 2026 04:14
URI:	http://repository.its.ac.id/id/eprint/130685

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