Penentuan Volume Endapan Nikel Laterit Berdasarkan Data Geolistrik Sounding Studi Kasus Lapangan “D.I.B” Blok Selatan Daerah Pomalaa, Sulawesi Tenggara

Suryawan, Eka Harris (2019) Penentuan Volume Endapan Nikel Laterit Berdasarkan Data Geolistrik Sounding Studi Kasus Lapangan “D.I.B” Blok Selatan Daerah Pomalaa, Sulawesi Tenggara. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Nikel di Indonesia dijumpai dalam bentuk nikel laterit hasil pelapukan batuan ultramafik. Berdasarkan data Badan Pusat Statistik, jumlah rata-rata ekspor nikel dari tahun 2002 hingga 2014 mencapai angka 17.103.785 ton/tahun. Hal itu menunjukkan eksplorasi nikel yang berkelanjutan sangat diperlukan untuk memenuhi kebutuhan industri terkait. Salah satu tahapan dalam kegiatan eksplorasi nikel adalah penentuan volume endapan. Pada penelitian ini dilakukan pengolahan terhadap data eksplorasi metode geolistrik sounding yang bertujuan untuk menentukan volume endapan nikel laterit di lapangan D.I.B daerah Pomalaa, Sulawesi Tenggara. Penentuan volume tersebut didasarkan pada model endapan yang dibuat dari hasil pengolahan metode geolistrik sounding. Metode geolistrik sounding mampu membedakan kontras resistivitas antara batuan dasar dan endapan nikel laterit. Pada penelitian kali ini digunakan data sekunder resistivitas metode sounding sebanyak 13 lintasan yang berarah barat-timur dan data pemboran sebanyak 17 titik. Hasil penelitian ini menunjukkan endapan nikel laterit Pomalaa dapat dibagi menjadi 3 zona berdasarkan nilai resistivitasnya, zona lateritic soil dengan nilai resistivitas 5–55 Ohm.m, zona peridotite boulder dengan nilai resistivitas 56–170 Ohm.m, dan zona bedrock yang merupakan zona terbawah dengan nilai resistivitas 171–3000 Ohm.m. Ketebalan endapan nikel laterit rata-rata berdasarkan data resistivitas didapati sebesar 9 meter dengan tingkat kecocokan antara hasil inversi 2D dan data pemboran mencapai 89%. Berdasarkan data resistivitas tersebut maka dibuat 4 buah model 3D dengan volume total endapan sebesar 4.011.248 m3. Diharapkan volume endapan berdasarkan hasil eksplorasi geofisika metode sounding tersebut mampu memberikan gambaran awal yang akurat mengenai endapan nikel laterit dan menjadi rujukan dalam kegiatan pertambangan selanjutnya.
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In Indonesia, nickel is evidently found in the form of nickel-laterite, resulted from weathering processes of ultramafic rocks. According to data of Statistic Central Agency, the average total of export from nickel from 2002 up to 2014 was 17.103.785 ton/year. It shows, then, that sustained exploration of nickel is highly required to satisfy necessity of related industry. One of phases in this exploration is determining of sedimentation volume. This research is aimed to make determining of nickel-laterite sedimentation’s volume in the field of D.I.B, Pomalaa, South-East Sulawesi based on sedimentation model obtained from resistivity method. By this method, it can differentiate resistivity contrast between bedrock and nickel-laterite sedimentation. Hence, the research used secondary data of resistivity sounding method at 13 lines, directed on west-east and drilling data of 17 spots. As result, this research found that nickel-laterite in Pomalaa could be divided into 3 zones based on their resistivity, comprising of lateritic soil’s zone having resistivity value of 5-55 ohm.m, peridotite boulder’s zone having resistivity value of 56-170 ohm.m, and bedrock’s zone becoming the most bottom zone by its resistivity value of 171-3000 ohm.m. The thickness of nickel-lateric sedimentation averagely based on resistivity data was 9 meters with the suitability level between the result of 2D inversion and drilling data of 89%. According to such resistivity data, 4 models of 3D were, then, made with total of sedimentation volume of 4.011.248 m3. It is hoped that sedimentation volume based on exploration of geo-electricity of sounding method could be able to provide early accurate portrayal concerning on nickel-laterite sedimentation and become reference in further mining activity.

Item Type:	Thesis (Other)
Additional Information:	RSGf 550 Sur p-1 2019
Uncontrolled Keywords:	Nikel Laterit, Pomalaa, Tahanan Jenis, Volume
Subjects:	Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport. Erosion. Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses
Depositing User:	Eka Harris Suryawan
Date Deposited:	25 May 2023 03:51
Last Modified:	25 May 2023 03:51
URI:	http://repository.its.ac.id/id/eprint/64767

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