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Johanes Hutabarat
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Evaluation of Acid-Base Accounting to Predict the Acid Water of Overburden in Coal Mines in Horna Areas, West Papua Province, Indonesia Hamdani, Ahmad Helman; Hutabarat, Johanes; Haryanto, Iyan; Ilmi, Nisa Nurul
Journal of Geological Sciences and Applied Geology Vol 2, No 3 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i3.15618

Abstract

Acid-Base Accounting (ABA) is an analytical procedure to measure the balance between the acid neutralization and acid generation properties of any geologic material. ABA is considered tools  to predict post-mining water. Overburden samples were collected from the coalfields of Horna coalmines. Maximum potential acidity (MPA), acid neutralizing capacity (ANC), acid net neutralization potential (ANG), Net Acid Producing Potential  (NAPP), net acid generation (NAG), and ANC/MPA ratios were determined for each site based on ABA.  Most of the sample from R1, R4, R-13, and R14 showing the pH of net acid generation of overburden ranges from 3.2 – 4.47 and positively acid net neutralization potential (be classified as the PAF-LC (Low Capacity Potential Acid NAPP) varies from 2.07 – 21.27 2.4 kg/t H2SO4   indicate that the samples are classified as the PAF-LC (Low Capacity Potential Acid Former (LC-PAF) to the PAF-MC (Moderately Capacity Potential Acid Former (MC-PAF). Other samples from R13 (four samples) has negatively NAPP and pHNAG between 6,21 – 7,10, therefore should be classified as the NAF; two samples from R13 indicated the uncertainty (UC) due to high pHNGA (6,82-7,15).
DISTRIBUTION PATTERN DIFFERENCES OF KALIWANGU FORMATION IN UJUNGJAYA AND PASIR MALATI, SUMEDANG, WEST JAVA Ilmi, Nisa Nurul; Haryanto, Iyan; Abdurrokhim, Abdurrokhim; Adhiperdhana, Billy Gumelar; Helmi, Faisal; Hutabarat, Johanes; Sunardi, Edy
Journal of Geological Sciences and Applied Geology Vol 3, No 3 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i3.26225

Abstract

The distribution of Kaliwangu Formation sediment in West Java generally follows the structure of Java fold thrust belt, which directed west-east. The Java fold thurst belt was efectively formed during Pleio-Pleistocene tectonics events, in which all of the Cenozoic sediment were deformed by compression stress in north-south direction. In Ujungjaya area, Kaliwangu Formation has northwest-southeast direction, while in Pasir Malati, the formation was arced relatively in north-south direction. Kaliwangu Formation distribution in Ujungjaya was influenced by the massive compression tectonics occurred in Java. This tectonic event were occurred during Pleio-Pleistocene which resulted in Java thrust fold structure pattern including Baribis Faults. Unlike in Ujungjaya, the distribution of Kaliwangu Formation in Pasir Malati was arced in north-south direction which caused by its fold structure. There is no indication of regional fault in Pasir Malati area although a lot of fault structure was found as a part of regional structure.
The Hydrogeochemical Model of "YR" Geothermal Field, East Java Rachmalia, Yunisa; Haryanto, Agus Didit; Hutabarat, Johanes; Abdillah, Yuniar Zhafira
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i3.51240

Abstract

The YR Geothermal Field is located in East Java. This field is associated with an active volcano, implying a potential for a high enthalpy geothermal system. This field is still in the exploration phase, but no drilling has been conducted yet. Thus, insights into the geothermal system are obtained through geochemical analyses of geothermal manifestations. Geochemical analyses were performed on hot spring water samples to determine the characteristics, processes, origin, and fluid flow of the geothermal system. The research results indicate that the warm springs have temperatures ranging from 29.4 to 54.8°C, with a nearly neutral pH (6.14-6.44) and high contents of HCO3 (457-1150 mg/kg), Na (77.7-255 mg/kg), and Mg (37.4-110 mg/kg). Therefore, it can be concluded that all the warm springs fall into the bicarbonate type with immature conditions, indicating no direct association with the reservoir. The upflow zone is interpreted to be at the peak of Mount 7, while the outflow zones are in areas A, B, and C. The fluids flow from the upflow zone, then condense and advectively flow down the slope, experiencing dilution and reactions with rocks before emerging as outflows in the western and north-western areas.
THE SUSTAINABLE MANAGEMENT OF POST-MINING LANDUSE; AN AHP APPROACH A CASE STUDY: EX-SAND MINING IN INDRAMAYU REGENCY, WEST JAVA Hamdani, Ahmad Helman; Hutabarat, Johanes; Muhamadsyah, Faisal
Journal of Geological Sciences and Applied Geology Vol 4, No 3 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i3.32224

Abstract

Recently, the sustainable management of post-mining land use has received great attention. The mining-closure, due to the mine has no longer economic value, or the mined material has run out; often leaving poor landscapes and degraded land.  The mining company have to rehabilitate the ex-mining land so that it can be returned to its original baseline stage or can be used for other more useful activities. The objective of research is to arrange the sustainable management plan of post-mining land use at ex sand-mining in Indramayu Regency, West Java. The Analytical Hierarchy Process (AHP) approach used to determine the priority of activities that will be carried out on the land. Several criteria and alternative were calculated by Saaty’s AHP pairwise comparison scale.  The research results reveal that in post mining land use management based on sustainable management, economic criteria must be considered first, followed by environmental, socio-culture and finally technical criteria. Fishery, cattle breeding and agriculture were found to be the optimal alternative for sand post‐mining land use.
IDENTIFICATION OF GEOTHERMAL PROSPECT AREAS USING REMOTE SENSING TECHNIQUES IN THE MOUNT GALUNGGUNG REGION Irsyanda, Keisya Adiva; Haryanto, Agus Didit; Hutabarat, Johanes
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i2.57274

Abstract

Geothermal energy sources are economical and have significant potential because Indonesia is located in the Ring of Fire area, which results in numerous tectonic processes that play a role in the emergence of geothermal resource potential. Among Indonesia's many geothermal energy potentials, one is the geothermal resource found in Tasikmalaya Regency, particularly in Mount Galunggung, an area with a geothermal system, as evidenced by geothermal manifestations. This research aims to determine the location of geothermal prospect areas using remote sensing techniques before conducting further research on the reservoir characteristics in a geothermal system in a given area. The study was conducted by analyzing surface temperature, structures in linear features, and field surveys to confirm the location of geothermal manifestations. The research results indicate geothermal prospect areas in the Mount Galunggung region in Sukaratu District, with surface temperature results ranging between 13-29°C.
TEKTONIK SESAR CIMANDIRI, PROVINSI JAWA BARAT Haryanto, Iyan; Hutabarat, Johanes; Sudrajat, Adjat; Ilmi, Nisa Nurul; Sunardi, Edy
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1146.649 KB) | DOI: 10.24198/bsc.v15i3.15103

Abstract

ABSTRACTCimandiri fault formed during stage II orogenesis is the oldest fault at the end of the middle Eocene. The Cimandiri fault is the active fault that developed a paleo high and uplifted the Ciletuh Formation within front arc basin. The stage III orogenesis at the Late Eocene indicated by regional compression in the Java that affected to reactivation fault. This fault known to be the same as the Baribis thrust fault. Finally, the compression tectonic decreased that it created the normal fault on Cimandiri thrust-fold. Therefore, we can define the Cimandiri fault into two regional fault patterns. The first pattern, the thrust fault that indicated by high bedding inclined. The second pattern, the next pattern is the normal fault that revealed by fault scarps inclination more than 50o or even vertical in some locations. Keywords: Cimandiri fault, front arc basin, Ciletuh valley, Cimandiri Valley. ABSTRACKSesar Cimandiri merupakan sesar tua yang terbentuk selama berlangsungnya orogenesa tahap II, yaitu pada waktu Akhir Eosen Tengah. Pada saat itu  batuan sedimen Formasi Ciletuh berumur Eosen Tengah yang terbentuk di dalam Cekungan Depan Busur  sudah terangkat ke permukaan. Sesar ini terus aktif hingga menyebabkan terbentuknya  tinggian purba (paleo-hight) antara Lembah Ciletuh dan Lembah Cimandiri. Pada Akhir Tersier, tektonik kompresi kembali terjadi, menyebabkan untuk ketiga kalinya sesar Cimandiri teraktifkan kembali sebagai sesar naik. Peristiwa ini disimpulkan sebagai orogenesa ke III di Pulau Jawa. Salah satu struktur sesar regional yang terbentuk pada saat itu adalah Sesar Baribis. Setelah tektonik kompresi berkurang terjadi kesetimbangan menyebabkan terbentuknya sesar normal pada jalur lipatan anjakan Cimandiri. Oleh karena itu, Sesar Cimandiri terdiri atas dua sesar regional yang pertama sebagai sesar naik yang dicirikan oleh deformasi lipatan batuannya yang umumnya tegak, dan sebagai sesar normal yang dicirikan dengan terbentuknya gawir sesar dengan kemiringan di atas 50° bahkan di beberapa lokasi mendekati vertical. Kata Kunci: Sesar Cimandiri, Cekungan Depan Busur, Lembah Ciletuh, Lembah Cimandiri.
GEOKIMIA BATUAN VOLKANIK FORMASI CIKOTOK DI SEGMEN UTARA KUBAH BAYAH, BANTEN Hutabarat, Johanes
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1162.08 KB) | DOI: 10.24198/bsc.v14i2.10963

Abstract

The Bayah Dome area compiled by various rock formations either volcanic rock and also sediment, where the volcanic rock is in general is main compiler from Cikotok and Cimapag Formation which age Tersier. Volcanic rock in Bayah Dome is distinguishable to become two main lithology types that are coherent- and non-coherent volcanic roks. Coherent volcanic roks in  Bayah dome northern segmentconsist of basalt-, and andesitelava. Andesitic lava is dominant rock. Both types of the lithology in general has experienced hydrothermal alteration distinguished with there is of secondary mineral like chlorite, sericite, carbonate, clay and opaq minerals. The mineralogical and rock geochemistry composition, the volcanic rock has been formed in island arc environment characterized by content SiO2 is ranging from 48.29%-58.34%, Al2O3 between 12.49%-17.18%; TiO2 and P2O5 ranges from 0.49%-0.81%, and 0.20%-0.41% respectively. Keywords: Andesite, Basalt, Hydrothermal alteration, Volkanic Calk-alkaline, Island arc.Daerah Kubah Bayah disusun oleh berbagai formasi batuan baik batuan volkanik maupun sedimen, dimana batuan volkaniknya  pada umumnya merupakan penyusun utama dari Formasi Cikotok dan Cimapag yang berumur Tersier. Batuan volkanik di Kubah Bayah dapat di bedakan menjadi dua jenis litologi yang utama yaitu batuan volkanik koheren dan batuan volkanik non-koheren. Batuan volkanik koheren di segemen utara Kubah Bayah terdiri dari lava basalt, dan andesit.  Andesitik merupakan batuan yang dominan. Kedua jenis litologi tersebut  pada umumnya telah mengalami ubahan hidrotermal yang dicirikan dengan terdapatnya mineral sekunder seperti klorit, serisit, karbonat, mineral lempung,  dan  mineral opak. Secara komposisi mineralogi dan geokimia batuan, batuan volkanik tersebut terbentuk di lingkungan busur kepulauan yang ditandai oleh kandungan kandungan SiO2 yang berkisar antara 48.29%-58.34%, Al2O3 antara 12.49%-17.18%; TiO2 dan P2O5 berturutan berkisar antara 0.49%-0.81%, dan 0.20%-0.41%. Kata Kunci: Andesit, Basalt, Alterasi hidrotermal, Volkanik Kalk-alkali, Busur Kepulauan. 
Studi Zona Stockwork Pada Main Grasberg Intrusion (MGI) Untuk Optimalisasi Produksi Pada Tambang Bawah Tanah Grasberg, PT. Freeport Indonesia, Papua, Indonesia SUMARWAN, FIRMAN; Rosana, Mega Fatimah; Hutabarat, Johanes
Bulletin of Scientific Contribution Vol 18, No 2 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v18i2.27329

Abstract

Tambang bawah tanah Grasberg merupakan salah satu cebakan porfiri Cu-Au yang berlokasi didalam Distrik Ertsberg, tepat dibawah tambang terbuka Grasberg. Studi ini dilakukan untuk mengetahui efektifitas tambang melalui pemetaan mineral dan sampling, sayatan tipis, sayatan poles, uji metalurgi droptest, dan uji abrasi batuan. Hasil studi menunjukkan zona stockwork pada instrusi MGI adalah alterasi potasik dengan kehadiran mineral Kalkopirit, Bornite, Pirit, Tenantite, dan Digenite sebagai mineral primer. Analisa metalurgi menunjukan tingkat kekerasan batuan normal-lunak dan tingkat resistensi batuan sedang, yang menjadi referensi bahwa zona stockwork alterasi potasik MGI merupakan zona yang paling efektif pada produksi tambang bawah tanah Grasberg Block Cave.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1984.924 KB) | DOI: 10.24198/bsc.v15i3.15098

Abstract

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
TINJAUAN KETERDAPATAN BATUAN ULTRAMAFIK DALAM KOMPLEK OFIOLIT CILETUH DI DAERAH CILETUH, JAWA BARAT Hutabarat, Johanes; -, Ismawan
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (246.568 KB) | DOI: 10.24198/bsc.v13i3.8408

Abstract

Ultramafic rock is defined as rock with a color index of more than 70, and most have good characteristics as igneous plutonic and metamorphic rocks. Ultramafic rocks in the area Ciletuh revealed in outcrops scattered as "pockets" (enclaves) in Ciletuh formation, with the tendency of azimuth northeast trending ± southwest, which gives the impression of intrusion body, or as blocks of exotic in Ciletuh Formation. Rock composed of peridotite and serpentinite of massive to foliated; associated with gabbro, basalt pillow structure. Association of peridotite-serpentinite with gabbro, basalt structure of the pillow, giving the impression that the rock may represent parts of the set ophiolite. Based on occurences in the field, where the body is suspected origin of ultramafic rocks in the ophiolite complex Ciletuh speculated a continuous sheet relicts oceanic crust that is emplaced above microcontinent. Part sheet becomes incomplete (dismembered) during emplacement, and then buried (burial) by next geological events (possible sedimentation process produces Formation Ciletuh) that largely hides covered by ofiolitic, and leaving only the ultramafic body which spread in most Ciletuh areas at West Java.
Co-Authors Abdillah, Yuniar Zhafira Abdul Jamil Muslim Abdurrokhim ⠀ Adhiperdhana, Billy Gumelar Adjat Sudrajat Adriansyah, Yan Agus Didit Haryanto -, Agus Didit Haryanto Ahmad Helman Hamdani, Ahmad Helman Asoka, Widya Awaludin, Winarno Bombom Rachmat Suganda, Bombom Rachmat Dicky Muslim Djadjang Jedi Setiadi Edy Sunardi Emi Sukiyah Endang Arini Faisal Helmi Feri Erfanto Hendarmawan Hendarmawan, Hendarmawan Hendarmawan, . Hermawan, Dudi Hill Gendoet Hartono Ildrem Syafri Insan, Rachmatulloh Irsyanda, Keisya Adiva Ismawan - Ismawan Ismawan, Ismawan Iyan Haryanto, Iyan Mega Fatimah Rosana Muhamadsyah, Faisal Muhammad Hery Setiyawan Mustofa, Santia Ardi Nana Sulaksana Nanda Natasia Nisa Nurul Ilmi Oktaviany, Vina Oktaviany, Vina Pinning, Fathira Rachmalia, Yunisa Rachmatika, Danella Sambodo, Tri Hananto Sambodo, Tri Hananto Priyo Sasilani, Resni Sentani, Eddy Arus Simarmata, Robertus S. L. SIRAJU, ASRUL Sri Widodo Sugianto, Asep SUMARWAN, FIRMAN Supriadi, Wildani Vijaya Isnaniawardhani Yazid, Yusron Zufialdi Zakaria