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INDONESIA
Buletin Sumber Daya Geologi
Published by Pusat Sumber Daya Mineral Batubara dan Panas Bumi
ISSN : 19075367     EISSN : 25801023     DOI : -
Core Subject : Science, Education, Social, Engineering,
Education Energy Engineering Environmental Science
uletin Sumber Daya Geologi merupakan Makalah berkala ilmiah terakreditasi LIPI bidang mineral, energi fosil, dan panas bumi. Makalah ini terbit tiga nomor dalam satu tahun pada bulan Mei, Agustus dan November. Pada Tahun 2010, Buletin Sumber Daya Geologi mendapat Akreditasi B sebagai majalah Berkala Ilmiah, kemudian akreditasi ulang Tahun 2012, dan akreditasi terbaru di Tahun 2015 untuk tiga tahun kedepan dengan nomor ISSN (print) : 1907-5367. Tahun 2017 Buletin Sumber Daya Geologi mendapatkan nomor eISSN : 2580 - 1023 untuk versi onlinenya.
Arjuna Subject : -
Articles 751 Documents
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OPTIMASI VALUASI EKONOMI ENDAPAN NIKEL LATERIT MEMPERHITUNGKAN BIAYA LINGKUNGAN: OPTIMIZATION OF THE ECONOMIC VALUATION OF LATERITIC NICKEL DEPOSITS CONSIDERING ENVIRONMENTAL COSTS Wahyu Sasongko; Rheva Dwiky Adhitya
Buletin Sumber Daya Geologi Vol. 17 No. 1 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i1.346

Abstract

Optimization of mineral economic valuation aims to determine the maximum net present value of a project over the life of mine. The economic valuation optimization model in this study is the development of the Lane (1988) and Sasongko (2013) model by considering environmental costs and referring to the cash flow framework. The research methods are include the following: (1) resource modeling and estimation, (2) mineral economic valuation modeling, (3) solution model determination, and (4) mineral economic valuation. Resource modeling in the block model with a size of 25 m x 25 m x 1 m. The block content estimation uses the inverse distance weighting (IDW) interpolation method. Economic valuation optimization modeling in this research is modeling in terms of cash flow by considering environmental costs and government policies such as taxes, royalties, and depreciation. Optimizing cut-off grade is an attempt to determine the optimum grade that will produce the maximum profit or net present value (NPV). The solution model in this case includes cut-off grade optimization for profit optimization and NPV optimization. The model solution to determine the optimum cut-off grade depends on constrains of the mining, concentrating and refining. Determination of the cut-off grade optimization model solution using analytical methods. In the case study, the estimated amount is US$4,253,566 tons of nickel ore. At a constant mining rate at an optimum level of 0.95%, the mine life is 4.85 years with an NPV of US$811,248,447. Optimization of economic valuation with NPV indicator, the life of mine of 4.44 years and maximum NPV of US$841,596,460. The cut-off grade value varies in each mining year: the 1st year with a grade of 0.99%; 2nd year level 0.99; 3rd year level 0.98%; 4th year level 0.97%; 5th year the rate is 0.95%. NPV economic valuation optimization has a greater value and shorter time, compared to profit optimization (profit).
MINERALISASI ENDAPAN SINABAR DAERAH BUKIT TEMBAGA KECAMATAN HUAMUAL, KABUPATEN SERAM BAGIAN BARAT, MALUKU: MINERALIZATION OF CINNABAR DEPOSIT AT TEMBAGA HILL, HUAMUAL DISTRICT, WESTERN SERAM REGENCY, MALUKU Herfien Samalehu; Arifudin Idrus; Nugroho Imam Setiawan
Buletin Sumber Daya Geologi Vol. 17 No. 1 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i1.348

Abstract

Iha – Luhu is located in the western part of Seram Island, Maluku which is placed at an elevation of 9 up to 341 meters above sea level and occupies Taunusa Metamorphic Complex. This study aims to study geological control, mineralization characteristics and ore geochemistry of cinnabar deposit in Iha - Luhu. Research method applies a literature review, fieldwork for sampling, geological mapping, alteration & mineralization and laboratory analysis including polished section, ore geochemistry (FA/AAS and ICP-AES, XRF) and elemental mapping (Micro-XRF). The results showed that characteristics of cinnabar deposits in Iha – Luhu were formed in two type of veins (fracture-related mineralization) and disseminated in metapelites and quartz-muscovite phyllite hostrocks and controlled by NNW-SE and NE- SW trending faults. Mineralization consists of cinnabar (±metacinnabar), arsenopyrite, stibnite, sphalerite, hematite, minor pyrite±pyrrhotite with gangue minerals consisting of quartz, illite, smectite and kaolinite. Cinnabar ore contains an abundance of Zn, Sb, Fe, As, indicating presence of precious metal (gold) and mercury (Hg) content reaching 72.4%.
KARAKTERISASI STRUKTUR PATAHAN PADA LAPANGAN PANAS BUMI X (SUMATRA) BERDASARKAN PEMETAAN GEOLOGI, PENGINDERAAN JAUH, DAN DATA GAYA BERAT: FAULTS CHARACTERIZATION IN X GEOTHERMAL FIELD (SUMATRA) BASED ON GEOLOGICAL MAPPING, REMOTE SENSING AND GRAVITY DATA Sri Mulyani; Yunus Daud; Riza G. Pasiki; Haris Siagian
Buletin Sumber Daya Geologi Vol. 17 No. 2 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i2.327

Abstract

Fault structure plays an important role in a geothermal system. Faults can be weak zones that are the location of intrusions that are related with heat sources, the location of permeability for reservoar, and as the fluid flow path to the surface that appears as manifestation. By understanding the characterization and distribution of geological structures in geothermal fields, the conceptual model of geothermal systems can be better understood, so the risk of counter-inaccuracies in the development of geothermal at the subsurface can be minimized. Field X is located on the Sumatra Island, known as development field that still trying to get the optimal well location for production. This study reveals how to identify faults in Geothermal Field X using gravity data analysis, remote sensing and geological mapping results. In detail, the gravitational data analysis includes checking the quality data, calculating and mapping of the residual and regional data, FHD, SVD, and 3D gravity modelling. Remote sensing data that analysed in the form of LIDAR rendering data, data used from geological mapping results are location and strike of faults. The results of this study are model and map of the faults distribution in geothermal field X that can be used as reference to understand the geothermal system, as well as the guidance for the well targeting.
KARAKTERISTIK ENDAPAN LATERIT NIKEL DAN UNSUR TANAH JARANG DI DAERAH PULAU GEBE, HALMAHERA TENGAH, MALUKU UTARA : CHARACTERISTICS OF NICKEL LATERITE DEPOSITS AND RARE EARTH ELEMENTS IN GEBE ISLAND, CENTRAL HALMAHERA, NORTH MALUKU Rabbani Rafif Abidin; Very Susanto; Sulaeman; Hartaja M. Hatta Wicaksono
Buletin Sumber Daya Geologi Vol. 17 No. 2 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i2.345

Abstract

Nickel laterite is a product of weathering of ultramafic rocks that have an abundance of olivine and orthopyroxene minerals. Geology in the Gebe Island, Central Halmahera Regency, North Maluku Province is composed of limestone, which is equivalent to the Waigeo Formation which has an inconsistent relationship with the underlying ultramafic rocks as carriers of laterite nickel deposits. Weathering of ultramafic rocks produces a different profile and character of laterite nickel. This study aims to determine the characteristics of laterite and rocks from the area and to determine the characteristics of rare earth elements. Based on the results of the study, it is known that laterite nickel carriers in the area are dunite. Laterite nickel deposit profile on the island consists of red limonite, yellow limonite, and saprolite. The red limonite zone is characterized by a relatively high Fe2O3 content and a strong degree of lateritization; the yellow limonite zone is characterized by a relatively high Al2O3 content and a weak to strong lateritization degree; the saprolite zone is characterized by a relatively high MgO and SiO2 content. In general, laterite Ni deposits in the study area show relative enrichment of REE to bedrock and LREE content is more abundant than HREE content. Based on the spearman correlation, the main controller of LREE(La-Eu) and HREE(Gd-Lu) enrichment is Fe mineral with the spearman coefficient value between LREE(La-Eu) and HREE(Gd-Lu) with Fe2O3 is 0,64-0,83. While the main controller of Sc enrichment is Al mineral with the spearman coefficient value between Sc and Al2O3 being 0,59.
POLA STRUKTUR GEOLOGI PEMBENTUK ZONA MINERALISASI DI BUKIT RANDU, KECAMATAN SELOGIRI, KABUPATEN WONOGIRI, JAWA TENGAH: GEOLOGICAL STRUCTURE PATTERNS FOR THE MINERALIZATION ZONE IN BUKIT RANDU, SELOGIRI DISTRICT, WONOGIRI REGENCY, CENTRAL JAVA Asmoro Widagdo; Gentur Waluyo; Rachmad Setijadi; Mochammad Aziz; Huzaely Latief Sunan
Buletin Sumber Daya Geologi Vol. 17 No. 2 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i2.351

Abstract

Mineralization in the Bukit Randu area and its surroundings is formed by geological structures to be investigated.This study uses data on fault striation, quartz vein plane and quartz veinlet plane. This study aims to determine the main structural pattern forming the mineralization zone. This research is useful for determining the geological structure model in the Randu Hill area. The research method was carried out through data collection in the field and analysis in the laboratory. Field data collection includes striation data measurement, quartz vein plane measurement, quartz veinlet plane and quartz vein sampling. Laboratory analysis includes stereographic analysis of striation and rose diagram analysis of vein and veinlet measurement data, and vein polishing mineragraphy. Quartz vein and veinlet mineralization in the Randu Hill area is controlled by a right lateral strike-slip fault trending northwest-southeast and a north-south normal fault. This mineralized zone is a north-south trending transtension zone due to en-enchelon right stepping of right lateral strike-slip fault. Precious metal minerals are located in the north-south trending veins in the same direction as the regional compression stress and normal faults.
STUDI GEOKIMIA TANAH DAN HUBUNGANNYA DENGAN MINERALISASI LOGAM DAERAH KETUNGAU HULU, KABUPATEN SINTANG, PROVINSI KALIMANTAN BARAT: STUDY OF SOIL GEOCHEMISTRY AND IT’S RELATIONSHIP WITH THE PRESENCE OF METAL MINERALIZATION IN KETUNGAU HULU AREA, SINTANG REGENCY, WEST KALIMANTAN PROVINCE Nicolaus Bagus Krismantoro; Nurcahyo Indro Basuki; Hartaja Hatta Wicaksono; John Mauritz
Buletin Sumber Daya Geologi Vol. 17 No. 2 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i2.352

Abstract

Ketungau Hulu is a gold prospect plan area in Sintang-Silantek Block on the island of Kalimantan which is a collaboration program between Indonesia (Geological Agency) and Malaysia (Jabatan Mineral and Geoscience). Administratively, the research area is located in Sintang Regency, West Kalimantan with an area of 18 km2. This study aims to identify the geological conditions, structure, alteration, and mineralization of the study area as well as potential anomalies for metal elements (Au, Cu, Pb, Zn, and Mn) based on soil geochemistry data and its relationship with the presence of mineralization. The study was conducted using soil samples from 84 points in the ridge and spur areas. In addition to soil samples, 48 rock samples and one sample from pan concentrate were also obtained. Furthermore, all samples were analyzed for chemical, geochemistry, statistic, petrology, petrographic, and mineragraphy. The research area consists of Greywacke Sandstone Unit, Arenite Sandstone Unit, and Diorite Intrusion Unit. Geological structure that developed in the area has relatively NNW-SSE and NW-SE trends. The alteration zones present in the research area are argillic zone and propylitic zone. Mineralization is found in dogtooth, crustiform, colloform, and assicular textured quartz veins with relative orientation directions NW-SE and NNE-SSW that presence of ore minerals such as native Au, chalcopyrite, pyrite, sphalerite, covellite, and from base metal contents abundance in the rock samples. The results of soil sample analysis showed that the Au had an anomaly value of log 1.90 ppb, Pb of sqrt 7.44 ppm, Zn of log 1.92 ppm, Cu of log 1.69 ppm, and Mn of log 2.46 ppm. Base metal elements anomaly is controlled by lithology, structure, and topography. Analysis using Pearson's product on base metal elements states that there are two groups of elements i.e., Au and Pb-Zn-Cu-Mn. Based on the anomaly distribution of base metal elements in soil and the presence of mineralization, it can be interpreted that there are four prospect area i.e., KU-1, KU-2, BE-1, and BE-2 prospects.
IDENTIFIKASI KETERDAPATAN MINERAL IKUTAN DAN ESTIMASI KANDUNGAN MONASIT PADA TAILING TAMBANG TIMAH DI PULAU BANGKA: IDENTIFICATION OF ACCESSORY MINERAL OCCURRENCE AND CONTENT ESTIMATION OF MONAZITE IN TIN MINE TAILINGS IN BANGKA ISLAND Ngadenin; Rachman Fauzi; Widodo
Buletin Sumber Daya Geologi Vol. 17 No. 2 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i2.353

Abstract

Mining activities in Bangka Island are being conducted since Dutch colonial era. The wastes of tin mining produced many abandoned tailings which could cause negative impact for environment. However, there are accessory minerals in tailings which could be the new potential source of critical mineral. The purpose of this study is to identify accessory minerals and content percentage of monazite in tailings of ex – tin mine in Bangka Island. The methods used in this study is determining the composite minerals based on grain counting analysis of 30 pan concentrate samples from several locations in Bangka Island before estimating the monazite content based on comparison between monazite percentage, pan concentrate mass, and tailing bulk mass. Based on mineral identification it is shown that the tailings consist of several minerals such as cassiterite, monazite, zircon, ilmenite, magnetite, hematite, anatase, rutile, tourmaline, fluorite, garnet, and pyrite with average monazite content in concentrate sample is 10.24%. Based on the calculation it is shown that the average value of monazite grade in tin mine tailing is 16.41 kg/ m3. The result of this study is expected to be some input for stakeholders to implement mineral conservation for achieving sustainable mining in the future.
ALTERASI HIDROTERMAL ENDAPAN SINABAR DAERAH BUKIT TEMBAGA, IHA – LUHU, PULAU SERAM, MALUKU : HYDROTHERMAL ALTERATION OF CINNABAR DEPOSIT IN TEMBAGA HILL, IHA – LUHU - SERAM ISLAND, MALUKU Herfien Samalehu; Arifudin Idrus; Nugroho Imam Setiawan
Buletin Sumber Daya Geologi Vol. 17 No. 3 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i3.357

Abstract

Iha – Luhu area is located in the western part of Seram Island, which is about 59.2 km from city of Piru. Geographically, it is located at 128o0’35” to 128o2’42”East Longitude and 3o20’40” s.d 3o22’05”South Latitude and is included in Huamual sub-district, West Seram Regency, Maluku. Stratigraphy of Iha – Luhu is composed of metapelitic rock and low grade metamorphic lithologies, namely meta quartz – muscovite sandstone units and quartz – muscovite phyllite unit and is unconformaby covered by alluvial deposits. Research area consists of three hydrothermal alteration zones which are mentioned as illite±kaolinite alteration zone, illite±chlorite alteration zone and Illit±smectite±kaolinite alteration zone. Illite±kaolinite alteration zone is characterized by assemblage of clay minerals, presumably illite and kaolinite. This alteration is associated with quartz-muscovite meta-siltstone and dominant occurred to quartz-muscovite meta-sandstone. Intensity of alteration is moderate to strong altered which mainly describing percentage of alteration mineral presence more than 75%. Based on assemblage of kaolinite and illite alteration minerals thus illite±kaolinite alteration zone was formed at temperatures <220o-300o C. Illite±chlorite alteration zone is associated with fracture-related mineralization and disseminated enrichment of cinnabar ore deposits where alteration pattern is a pervasive alteration show. This zone is characterized by presence of mica (illite) clay mineral and chlorite and quartz as well. Illite±chlorite alteration is more dominantly associated with quartz-muscovite phyllite and quartz-muscovite meta-siltstone and spread over in the middle of Bukit Tembaga. Formation Temperature of this alteration zone is estimated at 250o – 300o C. Illite±smectite±kaolinite alteration zone spread widely on top of Bukit Tembaga to lowlands and reaching area of ​​> 9.6 Km2. This alteration covers illite ± chlorite and illite ± kaolinite alterations with pervasive alteration pattern and strong altered alteration. Clay in this zone occurred due to alteration of muscovite/sericite and plagioclase minerals. Presence of smectite in this alteration zone reflects vertical depth that is relatively far from ore zone or at top of formation with temperature tend to be lower than illite and kaolinite minerals. Formation temperature of this alteration zone is estimated at 220o-300o C.
DISTRIBUSI UNSUR UTAMA DAN UNSUR TANAH JARANG PADA PELAPUKAN BATUAN GRANITOID DI DAERAH PARMONANGAN, KABUPATEN TAPANULI UTARA: DISTRIBUTION OF MAJOR ELEMENTS AND RARE EARTH ELEMENTS IN THE WEATHERED GRANITOID ROCKS IN THE PARMONANGAN AREA, NORTH TAPANULI REGENCY Ana Nurul Hidayati; Nurcahyo Indro Basuki; Sulaeman; Bayu Sayekti
Buletin Sumber Daya Geologi Vol. 17 No. 3 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i3.371

Abstract

The results of an investigation by PSDMBP in 2011 showed that the REE content in weathered granitoid at Parmonangan contained several elements with significant anomalies such as Ce (600 to 1400 ppm), La (400 to 1000 ppm), and Pr (600 to 1400 ppm). Therefore, further investigation needs to be carried out to determine the distribution of REE to the west of the previous investigation area. This study aims to determine the characteristics of the granitoid, weathering pattern, and profile of the REE content in the investigation area. The weathering of granitoid in the Parmonangan area comes from biotite granite and hornblende biotite granite. The geochemical characteristics of weathering indicate that Na2O, CaO, K2O, SiO2, P2O5, and MnO dissolve and are mobile during weathering, indicating a decrease in soil content compared to bedrock. Meanwhile, Al2O3, Fe2O3, TiO2, and LOI showed an increase in weathering results due to residual enrichment. The content of the weathered granitoid in the Parmonangan area shows the relative enrichment of LREE to HREE. The content of LREE is influenced by the distribution of La and Ce elements contained in monazite. The content of HREE is controlled by the distribution of element Y. Based on the Spearman correlation, titanite and apatite also affect the abundance of LREE. While the mineral-bearing HREE is zircon. The sample interval is in the REE leaching zone so that the concentration of REE obtained in the soil is lower than in the bedrock.
KARAKTERISTIK ALTERASI BAWAH PERMUKAAN DI LAPANGAN PANAS BUMI “X”, KABUPATEN SUKABUMI, PROVINSI JAWA BARAT : CHARACTERISTICS ALTERATION OF SUB-SURVEY IN “X” GEOTHERMAL FIELD, SUKABUMI, WEST JAVA PROVINCE Flaurentina Nadya; Aton Patonah; Undang Mardiana; Mochammad Nurhadi
Buletin Sumber Daya Geologi Vol. 17 No. 3 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i3.356

Abstract

Indonesia is one of the countries that has the largest geothermal potential in the world. One of them is located in Sukabumi Regency, West Java. In order to optimize geothermal potential, research on geothermal characteristics is needed, one of which is the study of alteration minerals in geothermal manifestations. This research is focused on alteration studies using coring and cutting data from the drilling of Well X. The sequence of rocks in Well X from oldest to younger succession consists of lake deposits, altered tuff, altered tuff breccias, altered dacite, altered andesite, altered andesite breccias and late volcanic breccias. which is divided into two volcanic periods, namely the Pliocene period from the eruption of Mount Citorek and the Pleistocene from the eruption of Mount Halimun and Mount Tapos. Based on the assemblage of alteration minerals, the alteration zone in Well X is divided into 3 zones, namely the smectite-chlorite zone at a depth of 24 to 600 MD, illite-chlorite zone at a depth of 600 to 700 MD, and the chlorite-smectite zone at a depth of 700 to 821 MD. Based on the mineral composition and alteration zone, the type of alteration in Well X is sub-prophylitic with neutral pH and temperature 200-300°C and can act as a containment zone and judging from the appearance of manifestations controlled by the structure, the study area is in the outflow zone.

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