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All Journal Bulletin of Scientific Contribution : Geology Indonesian Journal of Applied Sciences IJOG : Indonesian Journal on Geoscience Jurnal RISET Geologi dan Pertambangan Journal of Engineering and Technological Sciences Jurnal Teknologi Mineral dan Batubara Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) BULLETIN OF THE MARINE GEOLOGY Indonesian Mining Journal Buletin Sumber Daya Geologi JURNAL METEOROLOGI DAN GEOFISIKA Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan KURVATEK Indonesian Journal on Geoscience Indonesian Journal on Geoscience Jurnal Locus Penelitian dan Pengabdian Berita Sedimentologi Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal Teknologi Mineral dan Batubara Journal of Geosciences and Applied Geology Jurnal Meteorologi dan Geofisika Indonesian Mining Journal

Ildrem Syafri

Fakultas Teknik Geologi, Universitas Padjadjaran

Author-ID : 398579

Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences

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IDENTIFIKASI PROSPEK ANDESIT MENGGUNAKAN METODE GEOLISTRIK DI KECAMATAN CILAKU, KABUPATEN CIANJUR, JAWA BARAT ilmi, irpan; Taufan, Yoqi Ali; Denis, Mutebi; Nur, Andi Agus; Syafri, Ildrem
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Survei geolistrik ini dilakukan untuk mengetahui sebaran batuan andesit dan perlapisan pasir yang terdapat dibawah permukaan (di dalam bumi). Batuan tersebut memiliki nilai tahanan jenis kelistrikan (resistivitas) yang berbeda antara material-material lainnya dengan memanfaatkan sifat kelistrikan batuan untuk memetakan kondisi geologi di bawah permukaan. Kegiatan survei 2D geolistrik dilakukan selama 4 hari, yaitu dari 14-17 November 2017, di Kecamatan Cilaku, Kabupaten Cianjur, Jawa Barat. Pengukuran geolistrik ini dilakukan dengan menggunakan metoda resistivity konfigurasi Wenner dua dimensi, seta penyelidikan dilakukan sebanyak 21 lintasan pengukuran berarah Utara – Selatan, titik elektroda 0 berawal di utara dan titik elektroda 48 di selatan. Dari hasil pengukuran dan pengolahan data lapangan dapat dibuat model 2D penampang geolistrik untuk setiap lintasan, peta anomali lateran kedalam, dan 3D gabungan dari seluruh lintasan. Anomali sebaran di daerah penyelidikan dapat di bagi dalam beberapa kelompok anomali yaitu : 1. Anomali rendah, dengan kisaran nilai resistivitas 0 Ωm - 30 Ωm yang -menyebar pada kedalaman 0 – 10 m. Anomali ini di tandai dengan warna biru, di duga lapisan zona akuifer pasir terisi air. 2. Anomali sedang, dengan kisaran nilai resistivitas 30 Ωm - 90 Ωm. Anomali yang diduga lapisan pasir, lempung dan anomali ini juga dapat berupa pasir lempungan dengan banyak konkresi yang bersifat gampingan. Pada kedalaman 40-50 m lapisan ini terdapat menyebar di utara daerah penyelidikan. 3. Anomali tinggi dan sangat tinggi, dengan kisaran anomali lebih dari 100 Ωm. Anomali ini terdapat di tenggara daerah penyelidikan. Anomali ini ditandakan warna merah yang merupakan daerah paling menarik untuk untuk dijadikan prospek.Kata kunci : Geolistrik, Andesit, Cilaku, Resistivitas, Model 2D

PENDEKATAN KUANTITATIF DALAM PENENTUAN ASOSIASI FASIES LAUT DALAM FORMASI HALANG PADA SUNGAI KALIGINTUNG, JAWA TENGAH SUBAGJA, MUHAMAD AGAM; Setiadi, Djadjang Jedi; Jurnaliah, Lia; Syafri, Ildrem; Alam, Syaiful; Elfitra, Dhanu
Bulletin of Scientific Contribution Vol 17, No 3 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Penggunaan metode kuantitatif cukup berkembang pada tahun 1950an dalam bidang sedimentologi dan stratigrafi terutama dalam membantu menjelaskan asosiasi fasies, proses pembentukannya dan lingkungan pengendapan. Lokasi penelitian berada koordinat 07° 30' 00,0" – 07° 30’ 30.0” LS dan 109° 27' 30,0" – 109° 28’ 10,0” BT yang secara administratif berada pada Provinsi Jawa Tengah. Daerah penelitian termasuk ke dalam Formasi Halang. Tujuan dari penelitian ini adalah untuk mengetahui model asosiasi fasies lokal yang terbentuk pada daerah penelitian. Pengambilan data dilakukan dengan metode penampang stratigrafi terukur pada sebagian lintasan Sungai Kaligintung sedangkan pengolahan data dibantu oleh metode kuantitatif berupa analisis Markov Chain dan Binomial Probability untuk mengetahui hubungan antar fasies. Pada daerah penelitian terdapat 13 litofasies yaitu Diorganized gravels (A1.1), Normally-graded Pebbly Sand (A2.7), Thick-bedded disorganized sand (B1.1), Thin-bedded coarse-grained sand (B1.2), Parallel-stratified sand (B2.1), Thick-bedded sand-mud couplet (C2.1), Medium-bedded sand-mud couplet (C2.2), Thin-bedded sand-mud couplet (C2.3), Mud-dominated sand-mud couplet (C2.4), Mottled muddy sand (C1.2), Structureless silt (D1.1), Structureless mud (E1.1) dan Contorted strata (F2.1). Adapun asosiasi fasies pada daerah penelitian terdiri atas Channel fill deposit, Levee deposit, Lobe deposit dan Interchannel deposit. Kata kunci : Binomial Probability, Formasi Halang, Litofasies, Markov Chain.

MINERALISASI PADA BREKSI HIDROTERMAL, DAERAH TEPU, TAMBANG EMAS TERBUKA KELIAN, KECAMATAN LINGGANG BIGUNG, KABUPATEN KUTAI BARAT, PROPINSI KALIMANTAN TIMUR -, Antonius Bambang Yuniarto; -, Ildrem Syafri
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

This research was carried out at the southern pit wall in the open gold mining area of PT. Kelian Equatorial Mining, located at 00 00 '32, 56 "S - 00 05 '09, 14" South Latitude and 1150 23’ 29,02" - 1150 28' 04,73" East Longitude. Administratively, it located in the Tepu area, Subdistrict of Linggang Bigung, West Kutai, East Kalimantan province. Physiographically that area is a part of Central Kalimantan volcanic arc.Rocks exposed in this area can be divided into 4 (four) rock units, i.e. The Eocene Sandstone Unit; The Lower Miocene Andesitic Pluton Unit; The Middle Miocene Hydrothermal Breccia Unit; and The Early Miocene Diatreme Breccia Unit.Geological structures that developped in this area were joints and faults. The faults are dilational structures types, in the form of sinistral- and dextral normal faults. These geological structures facilitated the penetration of andesite, followed by the appearence of hydrothermal fluids which produced the formation of hydrothermal breccia, and diatreme breccia. Hydrothermal breccia fragment consisting of andesite and sandstone, usually in jigsaw textured which are arranged in a matrix rock flour (Sillitoe, 1985), i.e. very fine grained material that came from milling process of breccia fragments. The carbonate minerals in the form of bladed texture are dominat minerals that filled the interfragments and matrix cavities. Partially, apart of carbonate minerals, the bladed silica was also present in cavity filling. The cavity filling minerals are associated with the appearence of metallic minerals.The alteration zones in the research area can be grouped into three zones, namely: 1.) Zone containing chlorite + clay + sericite + adularia + carbonate 2.) Zone containing sericite + carbonate + clay + adularia ± quartz and 3.) Zone containing carbonate + clay + sericite + adularia + quartz / silica. These alterations are classified as subpropylitic - until phyllic zones (Corbett & Leach, 1996). Metal mineralization such as sphalerite, galena, pyrite, covellite, arsenopyrite and chalcopyrite are associated with carbonate alteration ± adularia ± quartz ± sericite ± clay were primarily formed as a cavity filling and veins in hydrothermal breccia. The analysis results of Au and Ag contents in some rocks samples of hydrothermal breccia ranged from 0.04 grams / ton to 8.96 grams / ton Ag and 0.55 to 11.8 grams / ton, while the recovery of Au ranged between 16.08% up to 85.12%. The highest content and % recovery value of Au was founded in hydrothermal breccia.The mineralization stages can be divided into three stages: 1). The pre-brecciation stage that associated with the occurence of chlorite, sericite, adularia, clay and pyrite dissemination as well as the formation of carbonate veinlets and quartzs in direction of the Northwest - Southeast, 2) The syn-brecciation stage, it related to the formation of hydrothermal breccia, i.e. the occurence of carbonate and silica enrichment and the alteration minerals such as sericite, adularia, clay that related to the deposition of base metals as cavity filling and as veinlets in the direction of Southwest-Northeast. 3) Post-breccia stage was related to the occurence of carbonate veinlets ± base metals which associated with the clay minerals. Those cut the fragments, rock flour matrix, cavities filling minerals in hydrothermal breccia after the their formation in the direction of Southwest-Northeast.Mineralization in the area of study occured as ore deposits in hydrothermal breccia and in the veins as well as the veinlets. Hydrothermal breccia formed by two processes, i.e.; structural control and high-pressure hydrothermal fluids, at the temperature more than 200° - 250° C, with the acidity condition of (pH) 6, 6-8, 3. This condition is classified as a system of low sulphidation that related to porphiry with gold-carbonate base metal deposits (Corbett & Leach, 1996).

SURVEI MAGNETOTELURIK DAERAH PANAS BUMI MARANDA, KABUPATEN POSO, PROVINSI SULAWESI TENGAH Awaludin, Winarno; Hutabarat, Johanes; Syafri, Ildrem; Sugianto, Asep
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKSurvei Magnetotelurik (MT) telah dilakukan di daerah panas bumi Maranda yang terletak di Kabupaten Poso, Sulawesi Tengah. Pola struktur geologi di daerah Maranda didominasi oleh arah utara-selatan yang berasosiasi dengan arah sesar naik Poso yang berada di bagian baratnya dan pola struktur berarah relatif barat-timur sebagai antitetiknya. Hasil perhitungan dengan geotermometer silika baik pada kondisi conductive cooling maupun adiabatic cooling menunjukkan nilai yang hampir sama dimana suhu reservoir berdasarkan geotermometer kelompok mata air panas Maranda berkisar antara 125-184°C. Tujuan survei ini adalah untuk mengetahui struktur tahanan jenis bawah permukaan yang berkorelasi dengan sistem panas bumi. Pengukuran MT di daerah panas bumi Maranda telah dilakukan pada 42 titik ukur yang tersebar membentuk 8 buah lintasan berarah baratdaya-timurlaut dengan jarak antar titik ukur sekitar 1000 m. Peta tahanan jenis (MT) memperlihatkan adanya pola kelurusan berarah baratlaut-tenggara dengan sebaran tahanan jenis tinggi di sebelah baratdaya dan sebaran tahanan jenis rendah di sebelah timurlaut. Batuan penudung yang dicirikan dengan nilai tahanan jenis rendah berada di sebelah timurlaut di antara mata air panas Maranda dan mata air panas Kawende dengan pola yang membuka ke arah timurlaut. Batuan penudung ini diperkirakan berada di dekat permukaan hingga kedalaman 750 meter dengan ketebalan 500-750 meter. Kata kunci: magnetotelurik, panas bumi, Maranda, Sulawesi Tengah ABSTRACTMagnetotelluric (MT) surveys have been conducted in the Maranda geothermal area located in Poso District, Central Sulawesi. The geological structure pattern in the Maranda region is dominated by the north-south direction associated with the Poso thrust fault in the west and the structures pattern of relative east-west trending as their antithetes. The results of calculations with silica geotherm meter in both conductive cooling and adiabatic cooling conditions show almost the same value that the reservoir temperature based on the geothermometric of the Maranda hot springs ranges from 125-184 ° C. The purpose of this survey is to knowing the structure of the subsurface resistivity that correlates with the geothermal system. Measurements of MT in geothermal Maranda have been done on 42 scattered points forming 8 trajectory direction southwest-northeast with the distance between the measuring point about 1000 m. The type resistance maps (MTs) show an alignment pattern in northwest-southeast direction with high resistance range in the south-west and low-end resistance range to the northeast. The cap rocks that are characterized by low-end resistance values are northeast of Maranda's hot springs and Kawende's hot springs with a pattern that opens to the northeast. The cap rocks are estimated to be near the surface to a depth of 750 meters with a thickness of 500-750 meters. Keywords: magnetotelluric, geothermal, Maranda, Central Sulawesi

LINGKUNGAN PENGENDAPAN SATUAN BATULEMPUNG SISIPAN BATUPASIR PADA FORMASI KEREK DAERAH JUWANGI DAN SEKITARNYA, BERDASARKAN KARAKTERISTIK LITOLOGI, ANALISIS STRUKTUR SEDIMEN, DAN KANDUNGAN FOSIL BENTONIK Morina, Hana; Syafri, Ildrem; Jurnaliah, Lia
Bulletin of Scientific Contribution Vol 12, No 3 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research area is located in the Juwangi, Grobogan District, Central Java Province. Geographically located between 110o 44’ 19,536” BT – 110o 49’ 19,5384” BT dan 7o 13’ 53,2704” LS – 7o 8’ 53,2716” LS. Research using the method geological surface mapping. Determination of depositional environment unit based on the characteristic of lithology, sedimentary structures, and benthic foraminiferal. Based on the characteristic of lithology, this unit composed of mudstone and sandstone. Mudstone has a consideralable thickness, as sandstones insert. Sedimentary structures that are found in the form of parallel lamination and cross lamination shows that its transport medium is water. Benthic foraminiferal analysis result indicate that the bathymetry zone is outer neritic. So it can be estimated that the depositional environment of this unit are in the shallow marine.

ZONASI ANOMALI UNSUR GEOKIMIA DI WEDA, KABUPATEN HALMAHERA TENGAH, MALUKU UTARA BERDASARKAN DATA UNIVARIAT DAN MULTIVARIAT Fadhly, Ahmad; Syafri, Ildrem; Abdurrokhim, .
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTThe research area is located in the Weda Region, Central Halmahera Regency, is a path of metal mineralization which belongs to the Halmahera magmatic arc. The study area has a coverage area of 10 km x 15 km. The purpose of this study is to reveal the availability of major elements content (Cu, Pb, Zn, Co, Ni, Mn, Ag, Li, K, Fe, Cr and Au) on river deposits in the form of maps of the major elements content. Geochemical data collection is done on intermittent river. The identification of the metal content of the samples taken was done in the PSMBP geochemistry laboratory using the Atomotic Absorbtion Spectrometry Logametri (AAS) method. A total of 12 elements have been analyzed for the levels in the highest samples of stream sediment and treated to obtain anomaly zone. In this case SPSS 21.0 software is used for identification anomaly based on the correlation value between elements, then the research area there are two elemental associations that have kinship in accordance with univariate statistics, multivariate with factor analysis test. The two elemental association elements: 1) Ni-Co-Li-K-Cr. The formation of Factor 1 shows a strong relationship between Ni as well as the associations Co, Li, K and Cr associated with the regional geological conditions of the study area, which is occupied by rock dominance mafic rock and ultramafiic rock. 2) Cu-Zn-Mn-Ag-Fe. The formation of Factor 2 was obtained based on the incorporation of geochemical data analysis results reflected from elemental associations in the surface environment of the Sulfide Ore Complex. The existence of this mineral is closely related to hydrothermal alteration. Keywords: Geochemistry, mineralization, Atomotic Absorbtion Spectrometry Logametri (AAS) method. ABSTRAKDaerah penelitian terletak di Daerah Weda, Kabupaten Halmahera Tengah, merupakan jalur mineralisasi logam yang termasuk ke dalam Halmahera magmatic arc, dan mempunyai cakupan wilayah 10 km x 15 km. Tujuan dari penelitian ini adalah untuk mengungkapkan keterdapatan kandungan unsur logam (Cu, Pb, Zn, Co, Ni, Mn, Ag, Li, K, Fe, Cr dan Au) pada endapan sungai dalam bentuk peta kandungan unsur logam tersebut. Pengambilan data geokimia dilakukan pada sungai intermitten. Identifikasi kandungan unsur logam dari contoh yang diambil dilakukan di laboratorium geokimia PSMBP menggunakan metoda Atomotic Absorbtion Spectrometri Logametri (AAS). Sebanyak 12 unsur telah dianalisis kadarnya di dalam percontohan sedimen sungai dengan kadar yang tertinggi dan diolah untuk mendapatkan zona anomalinya. Dalam hal ini software SPSS 21.0 dipakai untuk penentuan anomalinya berdasarkan nilai korelasi antar unsur, maka di daerah penelitian terdapat dua asosiasi unsur yang memiliki kekerabatan sesuai dengan data statistik univariat, multivariat dengan uji analisis faktor. Kedua asosiasi kekerabatan unsur tersebut adalah: 1) Ni- Co -Li-K-Cr, Pembentukan Faktor 1 memperlihatkan adanya hubungan yang kuat antara Ni serta asosiasi Co, Li, K dan Cr yang dikaitkan dengan kondisi geologi regional daerah penelitian, yaitu ditempati oleh dominasi batuan beku basa dan ultrabasa. 2) Cu-Zn-Mn-Ag-Fe. Pembentukan Faktor 2 didapat berdasarkan penggabungan hasil analisis data geokimia yang tercerminkan dari asosiasi unsur di lingkungan permukaan Komplek Bijih Sulfida. Keberadaan mineral ini erat kaitannya dengan alterasi hidrotermal. Kata Kunci: Geokimia, mineralisasi, metoda Atomotic Absorbtion Spectrometri Logametri (AAS).

PENGEMBANGAN PARIWISATA KAWASAN GUNUNG WAYANG DAN SEKITARNYA -, Ildrem Syafri
Bulletin of Scientific Contribution Vol 7, No 1 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The southern part of Bandung area available some geo-tourism, both was developed or not yet. Wayang Mount area and surrounding are one another that fully developed not yet. That area has geological phenomena and natural preserve. The objective of research is supporting geological information available for tourism developing at Wayang Mount area and surrounding. Main theme of research is modeling of tourism development that cares with environment. Base on literatures study, Bandung area has potency and constraint in connection with area development. That two aspects cause environmental problem that necessary integrated management. Some methods are used to get data; among other are literature study, field survey, and laboratory analysis. Probabilistic approach is used for data analysis.Research result show Wayang Mount area and surrounding is product of Quaternary volcanic. It has gentle to very steeply with elevation about from 1,425 to 2,198 meters from sea level. The drainage patterns are sub-radier, sub-dendritic, sub-parallel, and sub-rectangular. Stream order from 1 to 5 with drainage density reach 8.3 km / square km. Lithology is product of earlier Pleistocene to Holocene volcanic. That lithology consist volcanic breccia, tuff, and lava. A part of them hydrothermal altered and weathered. Base on analysis of microscopic, geochemistry and physic-mechanic show rock and weathering result’s can studied with measured. The available of hot spring in Wayang Mount area is controlled by structure pattern and active tectonic.The tourism development at Wayang Mount and vicinity is supported by strategic location, some geological phenomena, exquisite view, etc. That area is suitable for geo-tourism and agro-tourism development. The constraint aspect in development program is complicated environmental problem. Those problems are Wayang Mount area is natural preserve and main water resource of Citarum River.

POTENSI GEOWISATA DI KAWASAN TELUK CILETUH, SUKABUMI, JAWA BARAT Hardiyono, Adi; Syafri, Ildrem; Rosana, Mega F.; Yuningsih, Euis Y.; -, Herry; Andriany, Suci Sarah
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Ciletuh be local Geopark since August 2014, and now towards preparing to become a National Geopark. This geopark is proposed by the government of Sukabumi in 2014. Remains of the geology in this geopark is the emergence of ophiolite complex as a result of fossil tectonic subduction between the Eurasian plate and the Indo-Australian Plate at the age cretasius. Geomorphology tectonic activity form the shape known as the Ciletuh amphitheater, and also the unique shapes result of water erosion that formed the rocks that looks into unique shapes like dragon-stone, frogs-rock, buffalo-stone. etc. There is also the conservation of green turtles and other wild animals such as sea eagles, panthers also conservation Raflesia flowers, Cantigi and mangrove forests to support geopark Ciletuh. Geopark Ciletuh can be divided into four complexes, namely Geoarea Tamanjaya, Geoarea Ciwaru-Mount Rhinos, Geoarea Citisuk-Cikepuh and Geoarea Citirem Ujunggenteng.Some programs geotrek made to visit geoarea either road, or by sea with a boat, also made supporting facilities such as hotels, homestays, local guides and signs.

ANALISIS FASIES RESERVOIR A FORMASI MENGGALA DI LAPANGAN BARUMUN TENGAH, CEKUNGAN SUMATRA TENGAH Natasia, Nanda; Syafri, Ildrem; Alfadli, Muhammad Kurniawan; Arfiansyah, Kurnia
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKLapangan Barumun Tengah adalah lapangan yang baru dikembangkan semenjak ditemukannya potensi hidrokarbon pada sumur eksplorasi BT-1 pada lapisan batupasir A dan B tahun 1984. Pengambilan data baru berupa sumur pengembangan dan seismik 3D dapat digunakan untuk melihat pola sebaran lateral dan geometri batupasir yang sesuai dengan model lingkungan pengendapan yang diajukan, sehingga diperlukan studi lebih lanjut untuk memahami tipe fasies, distribusi lateral, geometri dan kualitas reservoir pada reservoir batupasir A. Kelompok Sihapas berumur Awal Miosen menindih tidakselaras terhadap Formasi Pematang. Formasi ini mengandung batupasir dengan ukuran butir medium-coarse dan batulempung yang diendapkan pada delta plain- delta front. Ketebalan pada Formasi Lower Sihapas di sumur BT-1 adalah 130 kaki dan terdapat 4 batupasir individu berukuran 40kaki, 8kaki, 30kaki, dan 10kaki masing-masing. Sedangkan pada sumur BT-2 ketebalan Lower Sihapas 150kaki dengan 4 batupasir individu juga masing-masing 53kaki, 23kaki, 5kaki, 22kaki. Berdasarkan deskripsi litofasies, maka dapat diinterpretasikan asosiasi fasies yang terdapat pada sumur BT-3 terdiri dari dua asosiasi fasies (genetic unit). Kata kunci: Fasies,Formasi Menggala, Sumatera Tengah ABSTRACTBarumun Tengah is one of newly developed field since the discovery of hidrocarbon potential in BT-1 Well on Sand A and B in 1984. Newly well and seismic data taken was able to determinate the geometry and lateral distribution of the sand facies. But the new integrated study to understand the facies type is needed. The Early Miocene Sihapas group was deposited unconformitely the Older Pematang Group, Consist of medium to coarse sandstone and shale deposited in delta plain to delta front environment. Thickness of the sand in BT-1 sand is aproximately 130 ft in total with 4 separated sandstone layer, from bottom to top 40ft, 8 ft, 30ft, and 10ft. while thickness in BT-2 Well 53ft, 23ft, 5ft, and 22ft respectively. Based on litofacies description, there are two genetic unit can be found. Keyword: Facies, Menggala Formation, Central Sumatera

KONTROL MINERALOGI TERHADAP “PROBLEMATIC ORE” CADANGAN GRASBERG BLOCK CAVE (GBC) TAMBANG BAWAH TANAH FREEPORT INDONESIA DI PAPUA F. G, Aiwoy; Syafri, Ildrem; Yuningsih, Euis Tintin
Bulletin of Scientific Contribution Vol 16, No 1 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

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Grasberg Block Cave adalah tambang bawah tanah yang merupakan kelanjutan dari Cadangan Grasberg yaitu sebuah tambang terbuka yang berada di atasnya. Tambang ini juga termasuk dalam Kontrak Karya A (COW “A”) PT. Freeport Indonesia, Distrik Ertsberg, Papua. Besarnya cadangan Grasberg Block Cave tersebut pada akhir Januari 2015 adalah 1.011 milyar ton dengan kandungan tembaga (Cu) 1.% dan emas (Au) 0.77 g/t. Grasberg Block Cave adalah tipe cadangan porphyry yang memiliki kadar Cu-Au tinggi dalam material stockwork dengan bentuk sepatu kuda yang dikelilingi oleh Kali Diorite. Performa uji metalurgi merupakan refleksi dari type bijih “ore” yang dibutuhkan oleh insinyur tambang untuk mendapatkan hasil yang optimal untuk metal target. Tipe bijih yang bersih akan diproduksi lebih untuk mendapatkan perolehan metal yang tinggi jika dibandingkan dengan bijih bermasalah (problematic ore). Identifikasi bijih bermasalah “problematic ore” di tambang bawah tanah Grasberg Block Cave, yang dibahas dalam makalah, diharapkan bisa berguna dalam proses penambangan. Kajian tentang bijih “bermasalah” (problematic ore) pada cadangan Grasberg Block Cave ini dilakukan untuk mengetahui karakteristik dan kontrol-kontrol mineralogi pada tipe ore ini guna mengurangi kerugian akibat berkurangnya perolehan mineral-mineral bijih berharga. Metode yang digunakan adalah pemetaan geologi dan sampling di lapangan, analisis XRD untuk sampel terpilih dari batuan inti hasil pemboran, serta analisis geo-metalurgi yang dilakukan di laboratorium. Jenis bijih yang bermasalah berdasarkan standar geo-metalurgi Freeport Indonesia, seperti halnya di tambang terbuka Grasberg, diprediksi juga terdapat di Grasberg Block Cave. Bijih ini dipengaruhi oleh mineral pengotor seperti mineral serisit-lempung>10%, pirit> 5%, dan mika> 15%. Oleh karena itu, pengamatan geologi di lapangan dikombinasikan dengan analisis laboratorium sangat penting untuk mengetahui bijih bermasalah pada cadangan tambang bawah tanah Grasberg Block Cave.

Co-Authors A. Sudradjat A. Sudradjat A. Sudradjat Abdurrokhim Almabrury Abdurrokhim ⠀ Abdurrokhim, . Achmad Noerkhaerin Putra Adi Hardiyono Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudrajat Adjat Sudrajat Adriano Mazzini Agus Didit Haryanto Agus Didit Haryanto -, Agus Didit Haryanto Agus Nur, Andi Agustiany, Irfani Agustina Djafar Agustinus, Eko Tri Sumarnadi Agustya Agustya Ahadi Ahmat Lamburu Ahmad Luthfi Aini, Hana Nur Ajat Sudrajat Almun Madi Amitama, Emilia Bunga Andi Agus Nur Andi Agus Nur, Andi Agus Antonius Bambang Yuniarto -, Antonius Bambang Yuniarto Aprillia, Belinda Rizka Ardiansyah, Reza Arief Prabowo Asep Mohamad Ishaq Shiddiq Aton Patonah Awaludin, Winarno Benyamin Benyamin Benyamin Benyamin, Benyamin Benyamin, Benyamin Billy G. Adhiperdana Bonar Tua Halomoan Marbun Brian Christiantoro Budhy Agung Budi Muljana Budiadi, E. Christiantoro, Brian Deni Wahyuadi Denis, Mutebi Deny Setiady Dicky Muslim Djadjang Jedi Setiadi Djajang Sukarna Dwandari Ralanarko Dwandari Ralanarko E. T. Paripurno E. T. Paripurno Edy Sunardi Eko Tri Sumarnadi Agustinus Eko Tri Sumarnadi Agustinus Electricia, K.S. Elfitra, Dhanu Embara, Patra Emi Sukiyah Emy Sukiyah Euis Tintin Yuningsih Euis Y. Yuningsih, Euis Y. Evaristus Budiadi F. G, Aiwoy Fachrudin, Kurnia Arfiansyah Fadhly, Ahmad Febri Hirnawan Febriwan Mohamad Febriwan Mohammad, Febriwan Febyani, Siska Firman Herdiansyah, Firman G. Hartono G. Hartono Ginanjar, Asep Hadian, Muhamad Sapari Dwi Hadian, Muhamad Sapari Dwi Hana Morina, Hana Hananto kurnio Hananto Kurnio Hartawi Riskha Hartawi Riskha, Hartawi Hartono, G. Hartono, Udi Haryadi Permana Hastowo Resesiyanto Hendarmawan Hendarmawan Heri Hermiyanto Zajuli Heri Hermiyanto Zajuli, Heri Hermiyanto Hermes Panggabean Hermes Panggabean Hermes Panggabean Herry -, Herry Hilarius Rodriguez Hilarius Rodriguez, Hilarius Hill Gendoet Hartono Hutabarat, Johannes ilmi, irpan Iqbal Ramadhan, M. Iqbal, M. Irfani Agustiany Irzon, Ronaldo Irzon, Ronaldo Iskandar Zulkarnain Ismawan Ismawan Ismawan Ismawan, Ismawan Iwan Setiawan Januar Arifin Johanes Hutabarat Johanes Hutabarat Johannes Hutabarat K, Mohammad Fatahillah Pradana Kapid, Roebiyanto Karyono Karyono Kuntadi Nugrahanto Kurnia Arfiansyah Kurnia Arfiansyah, Kurnia kurnio, Hananto kurnio, Hananto Lia Jurnaliah Lili Fauzielly M. Iqbal M. Iqbal Manwarjit, Manwarjit Marbun, Bonar Tua Halomoan Masturyono Masturyono Mayasari, Verna Mega F. Rosana, Mega F. Mega Fatimah Rosana Mega Fatimah Rosana Moeh. Ali Jambak Moeh. Ali Jambak, Moeh. Ali Moh. Heri Hermiyanto Zajuli Moh. Heri Hermiyanto Zajuli Muhamad Sapari Dwi Hadian Muhammad Kurniawan Alfadli Muhammad Zulfikar Muhammad Zulfikar Nana Sulaksana Nana Suwarna Nana Suwarna Nana Suwarna Nanda Natasia Nazar Nurdin Noor Cahyo Dwi Aryanto Noor Cahyo Dwi Aryanto Novianti Wahyuni Purasongka, Novianti Wahyuni Nuarihidayah, Gilang Diesty Nugroho, Sigit Dwi Nuraini , Siti Paripurno, E. T. Petra Wattimury Prabowo, Arief Pranowo Nugroho Pranowo Nugroho Prasetio, Rasi Prasetio, Rasi Prasetya, Muhammad Nurul Huda Purnama Sendjaja Purnama Sendjaja Puspita, Ramelia Eka Rahmola, Wiryadi Rizkiputra Ralanarko, Dwandari Ramzis, Novaldo Rasi Prasetio Resesiyanto, Hastowo Reza Ardiansyah Reza Ardiansyah Ridho Kresna Wattimena Ridho Kresna Wattimena Rivaldy, Mohammad Rodriguez, Hilarius Roebyanto Kapid Ronaldo Irzon Ronaldo Irzon Ronaldo Irzon Rusman Rinawan -, Rusman Rinawan Satrio Satrio Satrio, Satrio Satrio, Satrio Sendjaja, Purnama Sendjaja, Purnama Sendjaja, Purnama Shaska Zulivandama Shiddiq, Asep Mohamad Ishaq Siti Nuraini Soffian Hadi Stefanus Suryo Cahyono SUBAGJA, MUHAMAD AGAM Suci Sarah Andriany, Suci Sarah Sudarsana, Muhammad Rizki Sudradjat , Adjat Sudradjat, A. Sudradjat, A. Sudradjat, Adjat Sudradjat, Adjat Sudrajat, Adjat Sugianto, Asep Supriyanto Rohadi Suwarna, Nana Swasty Aninda Piranti Syaiful Alam Syaiful Bachri Tampubolon, Armin Taufan, Yoqi Ali Udaya Kamiludin Udi Hartono Udi Hartono Vijaya Isnaniawardhani Viqnoriva, S.N. Wahyu Sugiarto Wattimury, Petra Wiguna, Purwa Wilda Aini Nurlathifah Winantris Winantris Winarti Winarti Wrahaspati Rulandoko Yan Rizal, Yan Yoga Andriana Sendjaja Yogi Fernando, Yogi Yudi Darlan Yusriyah, Dzakiyah Zakaria, Firman Zarkasyi, Ahmad ZULFAHMI ZULFAHMI Zulfialdi Zakaria, Zulfialdi Zulkarnain, Iskandar ⠀, Abdurrokhim ⠀, Winantris

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