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All Journal JURNAL SIMETRIK Prosiding Seminar Nasional Sains dan Teknologi Terapan Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN Makara Journal of Science
Gingga, Flaminggo
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Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Engineering

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Evaluasi Investasi Dan Sewa Alat Untuk Kegiatan Pengupasan Overburden Dan Penggalian Bijih Nikel Di Bukit Gc Pada Kmpra Pulau Gee Kec. Maba Kab. Halmahera Timur Jenius, Jenius; Bargawa, Waterman Sulistyana; Gingga, Flaminggo
Prosiding Seminar Nasional Sains dan Teknologi Terapan 2019: Menuju Penerapan Teknologi Terbarukan pada Industri 4.0: Perubahan Industri dan Transformasi P
Publisher : Institut Teknologi Adhi Tama Surabaya

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Abstract

KMPRA adalah salah satu perusahaan yang bergerak dalam bidang pertambangan Nikel, dengan lokasi penambangan terletak di Pulau Gee, Kecamatan Maba, Kabupaten Halmahera Timur Propinsi Maluku Utara. Dalam memperlancar produksinya, KMPRA membuka beberapa lahan baru yang memiliki COG 2,5 %, salah satunya adalah bukit GC yang terletak diwilayah utara. Bukit GC yang akan ditambang seluas 19,17 Ha, cadangan bijih nikel yang akan digali sebesar 1.374.489 m3 dan Overburden (OB) yang akan dikupas 657.531 m3 dengan target produksi oleh perusahaan sebesar 250.000 ton/tahun dengan Mining Recovery 85 % dengan lama penambangan 5 tahun.Untuk pengadaan alat-alat mekanis (alat dororng Bulldozer dan alat gali Excavator). Untuk kegiatan pengupasan overburden dan penggalian ore bukit GC, akan dilakukan dengan menggunakan 2 metode yaitu antara investasi alat baru dan sewa alat. Pemilihan 2 metode ini berdasar pada nilai ekonomis alat apabila digunakan dalam kagiatan tersebut. Berdasarkan data cadangan,umur tambang,harga alat baru,depresiasi,pajak dan biaya operasional alat untuk investasi alat baru serta biaya sewa alat, besarnya biaya yang akan digunakan oleh alat dari masing-masing metode tersebut dapat dihitung dengan menggunakan analisis ekonomi Present Worth Cost (PWC) dan Future Worth Cost (FWC).
ANALISIS PERBEDAAN KADAR ENDAPAN BIJIH NIKEL SAPROLIT ANTARA HASIL EKSPLORASI DENGAN REALISASI PENAMBANGAN PADA BLOK GC PULAU GEE KABUPATEN HALMAHERA TIMUR PROVINSI MALUKU UTAR Jenius, Jenius; Bargawa, Waterman Sulistyana; Gingga, Flaminggo
Prosiding Seminar Teknologi Kebumian dan Kelautan Vol 1, No 1 (2019)
Publisher : Prosiding Seminar Teknologi Kebumian dan Kelautan

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Abstract

PT. Aneka Tambang Tbk, unit Geomin merupakan bagian dari PT. ANTAM yang membidangi masalah Eksplorasi di daerah pulau Gee, yang kemudian penambangannya dilakukan oleh  PT. Minerina Bhakti dilakukan dengan sistem penambangan terbuka. Tingkat validitas dari data eksplorasi akan terbukti setelah dilaksanakannya kegiatan penambangan, namun pada kenyataannya sering terjadi perbedaan antara data hasil ekplorasi dengan realisasi penambangan, maka penelitian ini akan menganalisa sebab-sebab terjadinya perbedaan kadar hasil ekplorasi dengan realisasi penambangan, serta faktor-faktor penyebab terjadinya perbedaan kadar tersebut. Adapun titik bor yang tertambang pada bulan Juni adalah 19 titik bor dengan kadar Ni eksplorasi rata-rata 2,20 % dan kadar penambangan 2,27 % sedangkan  bulan Juli sebanyak 16 titik bor dengan kadar rata-rata Ni  2,23 % dan kadar rata-rata penambangan 2,20 %. Selisih kadar Ni antara eksplorasi dengan realisasi penambangan pada bulan Juni adalah 0,07 % dan pada bulan Juli adalah 0,04 %. Berdasarkan hasil penelitian, maka diketahui penyebab terjadinya perbedaan kadar Ni antara hasil eksplorasi dan produksi adalah: penyebaran deposit yang tidak merata, pengotoran dan kehilangan bijih saat penambangan, cara pengambilan sampel, air hujan, dan kesalahan manusia PT. Aneka Tambang Tbk, Geomin unit is part of PT. ANTAM is in charge of exploration issues in the Gee island area, which is then carried out by PT. Minerina Bhakti is carried out with an open mining system. The level of validity of exploration data will be proven after mining activities are carried out, but in reality there is often a difference between the exploration data and the realization of mining, so this study will analyze the causes of differences in exploration results with mining realization, as well as the causes of differences these levels. The drill points mined in June are 19 drill points with exploration Ni content of 2.20% and mining levels 2.27% while July is 16 drill points with an average Ni content of 2.23% and average mining levels 2.20%. Ni difference between exploration and mining realization in June was 0.07% and in July it was 0.04%. Based on the results of the study, it is known that the causes of differences in Ni content between the results of exploration and production are: distribution of uneven deposits, contamination and loss of ore during mining, sampling method, rainwater, and human error.
Recovery of Gold with AgNO3 Pretreatment by Cyanidation at Heap Leaching Cijiwa Gold Ore Processing Kusdarini, Esthi; Budianto, Agus; Gingga, Flaminggo
Makara Journal of Science Vol. 22, No. 2
Publisher : UI Scholars Hub

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Abstract

This research was undertaken to study the effect of adding silver nitrate (AgNO3) during leaching of gold ore for Aurecovery. Its focus is to obtain the weight of Au in feed and concentrate, the effect of AgNO3 on Au recovery, theconcentration of AgNO3 that led to optimum recovery, and the weight of bullion and Au content in bullion. This research was conducted using quantitative descriptive method with experimental technique and the research stepsinclude the following: 1) rock and treatment plant preparation, 2) tests with variable AgNO3 concentrations, 3) analysis feed and concentrate samples using atomic absorption spectroscopy (AAS), 4) measurement of concentrate density, 5) burning of activated carbon to get the bullion, and 6) weighing bullion and Au content. There was increase Au recovery from 12.57% to 36.15%. On addition of 0 to 4 gram of AgNO3, whereby highest recovery was obtained on the additionof 4 g of AgNO3 concentration to 150 kg of feed.
An IDENTIFIKASI KETERDAPATAN POTENSI BAHAN GALIAN PASIR KUARSA DI KELURAHAN PADANG, KECAMATAN SUKAMARA, KABUPATEN SUKAMARA Desyana Ghafarunnisa; Gingga, Flaminggo; Kurniawan , Angga
JURNAL SIMETRIK Vol 15 No 2 (2025): Desember
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/js.v15i2.3233

Abstract

Quartz sand plays a vital role in various industries due to its unique properties and practical applications. Sukamara Regency is one of the regions with widespread quartz sand distribution. This research was conducted in Teluk Madang, Padang Sub-district, Sukamara District, Sukamara Regency, Central Kalimantan Province. The objectives of this study are to determine the distribution and thickness of quartz sand in the study area and to estimate its resource potential. The research method involved direct field observation, which was then processed into spatial data and resource calculation using the polygon method. Based on the regional geological map of the Pangkalan Bun sheet, the area comprises three geological formations: the Dahor Formation (TQd), Alluvial Deposits (Qa), and Mud Deposits (Qs), all of which show potential for quartz sand accumulation. Geomorphological observations identified three landform units: alluvial plains (51%), swampy lowlands (20%), and undulating terrain (29%). A total of 96 hand-drilled boreholes were carried out across the study area, which covers 4.62 hectares. The thickest quartz sand layer recorded was 3.6–4 meters, while the thinnest was 0.4 meters. The average thickness ranged from 1.3 to 1.8 meters. Using the polygon method, the estimated volume of quartz sand resources is 12,225 m³. With a density of 2.6 g/cm³, the total estimated tonnage of silica sand in the 4.62-hectare study area is approximately 31,785 tons. Keywords: Quartz sand, Sukamara Regency, resource estimation, polygon method, geological formation, geomorphology.
Co-Authors Agus Budianto Desyana Ghafarunnisa Jenius, Jenius Kurniawan , Angga Kusdarini, Esthi Waterman Sulistyana Bargawa, Waterman Sulistyana