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All Journal IJOG : Indonesian Journal on Geoscience Jurnal technoscientia Jurnal RISET Geologi dan Pertambangan Seminar Nasional Teknik Kimia Kejuangan Journal of Degraded and Mining Lands Management Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Jurnal Ilmiah Dinamika Rekayasa (DINAREK) UNEJ e-Proceeding Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal Geomine Indonesian Mining Journal PROMINE Buletin Sumber Daya Geologi Jurnal GEOSAPTA International Journal of Community Service Learning TEKNOLOGIA Al-Ard: Jurnal Teknik Lingkungan KURVATEK Jurnal Abdi: Media Pengabdian Kepada Masyarakat Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN JURNAL TEKNOLOGI TECHNOSCIENTIA Indonesian Journal on Geoscience Indonesian Journal on Geoscience Journal of Applied Geology SRIWIJAYA JOURNAL OF ENVIRONMENT Ophiolite : Jurnal Geologi Terapan Jurnal Locus Penelitian dan Pengabdian International Journal of Hydrological and Environmental for Sustainability INTAN Jurnal Penelitian Tambang Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Jurnal Ilmiah Geologi pangea Jurnal Ilmiah Geomatika Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Asian Journal of Social and Humanities Indonesian Mining Journal Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Arifudin Idrus
Departemen Teknik Geologi Fakultas Teknik Universitas Gadjah Mada
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Journal : Jurnal Geomine

 1 
Karakteristik Alterasi dan Mineralisasi Endapan Emas Tipe Carlin pada Blok Yance dan Leon, Kecamatan Ratatotok, Kabupaten Minahasa Tenggara, Provinsi Sulawesi Utara Alyna Azarine; Muhammad Arba Azzaman; Arifudin Idrus
Jurnal Geomine Vol 9, No 3 (2021): Edisi Desember 2021
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v9i3.1001

Abstract

Study of gold deposit in Mesel, Ratatotok, North Sulawesi has been conducted by numerous experts, but there has been no detailed research on other prospects near Mesel, like Yance and Leon where this study is conducted. The objectives of this study is to determine the differences in the characteristics of hydrothermal alteration and ore mineralization in the Yance and Leon Prospects. Core sample description, microscopic analyses (petrography, ore microscopy), X-Ray Diffraction, and SEM-EDX are the methods used to identify those characteristics. The results of these analyses indicate that limestone and collapse breccia controlled alteration and mineralization in this area. Hydrothermal alteration that are developed in this area are silicification, silica-calcite, illitesmectite- chlorite±calcite. Ore minerals are found as dissemination, replacement, and open-space fill, such as pyrite, arsenopyrite, realgar, orpiment, hematite, and goethite, with gangue minerals such as quartz, calcite, dolomite, gypsum, chlorite, kaolinite, illite, smectite, and rhomboclase. Analysis on mineral chemistry identify numerous elements, essentially Fe, S, As, Cu, Au, Ag, Sb, Cd, Co, and Ni where average Co content is higher than average Ni. The difference in characteristics between the two research sites is that the source rock of the Yance Block has limestone lithology and polymyctite breccia, while in the Leon Block the source rock is limestone. Alterations that have developed in the Yance Block include decalcification, silicification, silica-calcite, and illit-smectite-chlorite±calcite with replacement-type and open-space fillingmineralization, while in theLeon Block is silicification, silica-calcite. , and illite-smectite-chlorite±calcite with the dominant type of replacement mineralization. The ore minerals found in the Yance Block include pyrite, arsenopyrite, realgar, orpimen, hematite, goethite, while in the Leon Block they are pyrite and hematite.
Pemetaan dan Survei Geokimia Batuan untuk Prospeksi Mineralisasi Bijih pada Daerah Tolangohula, Kabupaten Limboto, Provinsi Gorontalo Arifudin Idrus
Jurnal Geomine Vol 9, No 2 (2021): Edisi Agustus 2021
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v9i2.965

Abstract

Tolangohula merupakan prospek yang berada dalam sabuk mineralisasi emas dan logam dasar di Sulawesi Utara, secara administratif terletak di Kabupaten Limboto, Provinsi Gorontalo. Sementara itu data eksplorasi atau penelitian mineralisasi masih terbatas. Oleh sebab itu, penelitian ini bertujuan untuk mengetahui kondisi geologi, sebaran zona alterasi dan mineralisasi bijih, serta geokimia batuan/bijih untuk mendeliniasi daerah-daerah target yang direkomendasi pada kegiatan eksplorasi lanjutan yang lebih rinci. Metoda penelitian yang diterapkan antara lain pemetaan geologi dan alterasi rinci, pengambilan sampel, analisis sampel dengan petrografi, mikroskopi bijih dan geokimia bijih dengan menggunakan FA-AAS dan ICP-MS. Data geokimia dianalisis secara univariat dan multivariat. Daerah penelitian tersusun oleh satuan andesit yang diterobos oleh satuan diorit-granodiorit yang merupakan bagian dari Intrusi Diorit Boliohuto (Tmbo) yang berumur Miosen Tengah-Akhir. Struktur yang berkembang relatif timur laut-barat daya dan barat laut-tenggara. Alterasi hidrotermal diidentifikasi berupa filik, argillik dan propilitik. Zona filik memiliki intensitas alterasi yang pervasif, kuat dan berasosiasi dengan kehadiran urat-uratan dengan struktur stockwork. Mineralisasi bijih dalam bentuk tersebar dalam batuan (disseminated) dan mengisi urat/uratan dicirikan dengan kehadiran bornit, kalkopirit, pirit, magnetit dan free gold. Kadar emas berkisar dari  0,005 ppm hingga 0,363 ppm dan rerata 0,028 ppm. Kadar tembaga berkisar dari  2 ppm sampai 1.830 ppm (0,183%), dengan rerata 189,5 ppm. Nilai kadar Cu dan Au berkorelasi positif dan berasosiasi dengan zona mineralisasi dan alterasi yang kuat berupa filik. Berdasarkan karakteristik endapan tersebut, kemungkinan tipe endapan yang hadir di daerah penelitian adalah tipe endapan Cu-Au porfiri. Studi ini juga merekomendasi 3 daerah target eksplorasi lanjut yaitu Daerah Target 1 (Blok Timur), Daerah Target 2 (Blok Tengah) dan Daerah Target 3 (Blok Barat). Metoda eksplorasi lanjut yang direkomendasi meliputi geokimia tanah (soil geochemistry) serta survei geofisika IP dan/atau ground magnetics.
Karakteristik Mineralisasi Endapan Emas Epitermal Sulfidasi Rendah di Daerah Mekarbakti, Kecamatan Bungbulang, Kabupaten Garut, Provinsi Jawa Barat Rangga Bintang Ardaraja; Eddy Winarno; Arifudin Idrus; Okki Verdiansyah; Satriadi Satriadi
Jurnal Geomine Vol 10, No 2 (2022): Edisi Agustus 2022
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v10i2.1198

Abstract

The southern mountains of western Java have been known to have large gold deposit potential. The Mekarbakti area, located in Garut regency, is known to have gold-bearing quartz veins, but the distribution and characteristics of these veins are not well recorded. The purpose of this study is to determine the geological conditions of the deposits and the characteristics of the epithermal deposits in the study area, in term of alteration, ore mineralization, vein texture, and ore geochemistry. Field work includes random sampling of veins from surface outcrops and cores. Laboratory analysis includes mineragraphic, geochemical analysis by means of Fire Assay Atomic Absorption Spectrophotometry (FA-AAS) and Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES). The lithology of the Mekarbakti area is composed of volcanic rocks including andesite lava, andesite intrusion and pyroclastic rocks such as breccia and tuff. The mapping results show that the hydrothermal alteration that developed is divided into three zones of alteration type, namely the silicification zone (silica + - clay), the argillic zone (kaolinite + - smectite - illite) and the propylitic zone (chlorite - smectite - epidote - illite). Quartz texture is generally dominated by brecciated, colloform, comb, lattice bladed and cockade textures. The texture interpretation of the veins shows a crystalline quartz zone, which is enriched in base metals such as galena, sphalerite and chalcopyrite and a crustiform – colloform zone which usually contains gold and silver. Veins in the study area contain the elevated grades of 3.21 ppm Au and 75.5 ppm Ag.
Geologi Dan Mineralisasi Endapan Emas Orogenik Di Gunung Lipan, Kecamatan Rorowatu, Kabupaten Bombana, Sulawesi Tenggara, Indonesia Hidayatullah Hidayatullah; Arifudin Idrus; Anastasia Dewi Titisari
Jurnal Geomine Vol 10, No 3 (2022): Edisi Desember 2022
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v10i3.1297

Abstract

The prospect of Gunung Lipan is located in Rorowatu District, Bombana Regency, Southeast Sulawesi Province.  Physiographically it is situated in the Rumbia mountains, which is occupied by the metamorphic rocks of Pompageo complex. The Gunung Lipan is a prospect which has potential to produce gold mineralization in the Rumbia Mountains. However, a detailed research has never been carried out, in which the latest research is still on regional scale. Therefore, this study aims to understand more details about the geological conditions, alteration types and mineralization characteristics of the prospect and its surroundings. The research methods include geological mapping, petrographic analysis to determine type of hostrock, ore microscopy analysis to determine sulfide minerals in rocks/veins, and ore geochemistry to determine metal content in rocks and veins. Gold mineralization in the Gunung Lipan is hosted by mica schist, and controlled by sinistral shear fault in form of shear zone. The fault movement in the field is indicated by the presence of a milonite structure in the rock and the texture of mica fish on microscopic observations. The hydrothermal alteration appears at the study area is a typical type of alteration found in orogenic gold deposits such as silicification, carbonatization, and carbonization, argillic and propylitic. The sulfide minerals of orogenic type of gold deposit occurred in this study consist of stibnite, sinnabar, tripuhyite, pyrite, arsenopyrite, and hematite. Sulphide minerals are present in rocks and veins in disseminated form. Based on the results of geochemical analysis of gold content ranging from 0.005 ppm to 1.25 ppm, high grade gold was found in quartz veins that cross-cut foliation and veins with brecciated texture. Correlation of metallic elements using multivariate statistical methods shows that gold is positively correlated with As, Sb, and Hg, negatively correlated with Ag, and base metal elements (Pb, Zn, and Cu) are not abundant and are depleted when there is an increase in degree of metamorphism, which obviously implies a typical characteristics of orogenic gold deposit.
Co-Authors A. Harijoko A. Harijoko A. Imai A. Imai A. M. Imran Abdul Abdul Abdul, Abdul Abrar, Miftahul Afrilita, Afrilita Agung Harijoko Agung Harjoko Agus Prasetya Ahmad Ahmad Ahmad Ahmad Akira Imai Alyna Azarine Aminatun, Tien Anastasia Dewi Titisari Anjarwati, Retno Anna Rakhmawati Araki, Naoto Arfan Siregar Asfaro, Raden Muhammad Asih, Yekti Asrafil Asrafil Ati, E. M. Atmoko, Didik Dwi Atmoko, Didik Dwi Bambang Priadi Cendi D. P. Dana Chun-Kit Lai Dana, Cendi D. P. Danny, Rama Danny, Rama Dian Yesy Fatimah Didik Dwi Atmoko Didik Dwi Atmoko Djoko Wintolo Djoko Wintolo Djoko Wintolo, Djoko Donatus Hendra Amijaya Dwi Fitri Yudiantoro E. M. Ati E. M. Ati Eddy Winarno Edy Nursanto Edy Nursanto Edy Nursanto Ernowo Ernowo Ernowo Ernowo Ernowo Harjanto Ernowo Harjanto, Ernowo Ernowo, Ernowo Esti Handayani Esti Handayani F. M. Meyer F. M. Meyer F. Thamba F. Thamba Fadlin Fadlin Fadlin Fadlin Fadlin Fadlin Idrus Fadlin, Fadlin Faesal, Andi Faruqi, M.Dzulfikar Feddy Yurniadi Fenny Tamba Ferian Anggara Franklin Franklin Franklin Franklin Franklin, Franklin Franz M Meyer Franz Michael Meyer Franz Michael Meyer Franz Michael Meyer, Franz Michael Godang, Shaban Godang, Shaban Hakim, Fahmi Hamzah, Wildan Nur Handayani, Esti Harijoko, A. Harjoko, Agung Harjoko, Agung Hasria Hasria Hasria Hasria Hasria Hasria, Hasria Heimbach, Ivano Herfien Samalehu Herfien Samalehu Hermansyah, Wahyu Hidayatullah Hidayatullah Hill Gendoet Hartono Himawan Tri Bayu Murti Petrus HTBM Petrus I Gde Sukadana I Gde Sukadana I Gede Budi Irawan Budi Irawan I Wayan Warmada I. Nur I. Nur I. Nur Idrus, Fadlin Ignas A. Meak Ilmawan, Ilham Imai, A. Imai, Akira Imam Suyanto Indra Sanjaya Indra Sanjaya Irwan Endrayanto, Irwan Irzal Nur Irzal Nur, Irzal Isyqi Isyqi Iwan Setiawan Iwan Setiawan Iwan Setiawan Iwan Setiawan Jochen Kolb Johan Arif Johan Arif, Johan Kaharuddin Kaharuddin Kaharuddin, Kaharuddin Kant, Win Khant, Win Koichiro Watanabe Koichiro Watanabe Koichiro Watanabe, Koichiro Kolb, Jochen Kotaro Yonezu Kris Ramlan Kurniawan, Winarto L. D. Setijadji L. D. Setijadji Lai, Chun-Kit Leeuwen, Theo Van Lia Novelia Agung Lia Novelia Agung, Lia Novelia Lucas D Setijadji Lucas Donny Setijadji Mansur, Suaib May Thwee Aye Meak, Ignas A. Mersi Abadi Meyer, F. M. Meyer, Franz M Meyer, Franz M Mochammad Aziz Mochammad Aziz Mochammad Aziz, Mochammad Moetamar Moetamar Moetamar Moetamar Moetamar, Moetamar Mohamad Anis Mohamad Anis Mohamad Anis Mohamad Anis Mohamad Anis, Mohamad Mudinillah, Adam Muhammad Arba Azzaman Muhammad Muhsin Al Hakim Myaing, Yu Yu Myo Min Tun Myo Min Tun Naoto Araki Nhatinombe, Hernani Vitorino Nugroho Imam Setiawan Nur, I. Nur, I. Nurkhamim Nurkhamim Nurkhamim Nurkhamim Nurkhamim Okki Verdiansyah Okki Verdiansyah Okki Verdiansyah Okki Verdiansyah Pambudi, Setia Por, Vannak Pramumijoyo, Pranayoga Pramumijoyo, S. Pranayoga Pramumijoyo Prasetyawati Umar, Emi Prastistho, Widyawanto Pratiwi, Fadiah Pratomo, Septyo Uji Priadi, Bambang Prihatmoko, Sukmandaru Putranto, Sapto Putranto, Sapto Putranto, Sapto Raden Isnu Hajar Sulistyawan, Raden Isnu Hajar Rahmah, Yuyun Prihatining Rahmayuddin Rahmayuddin Rahmayuddin, Rahmayuddin Rama Danny Rangga Bintang Ardaraja Rangga Bintang Ardaraja Retno Anjarwati Retno Anjarwati Rika Ernawati Rika Ernawati Riyadi, Hasan Rizal, Khairu Rohaya Langkoke Rohaya Langkoke S. Pramumijoyo S. Pramumijoyo Samalehu, Herfien Sapto Putranto Sapto Putranto Satriadi Abdullah Satriadi Satriadi SATRIYAS ILYAS Setia Pambudi Setiawan, Iwan Setiawan, Iwan Setijadji, L. D. Setijadji, Lucas D Setijadji, Lucas D Shaban Godang Shaban Godang Simbolon, Doly Sindern, Sven Siti Rahmawati H. Budiawan SRI ATUN Suaib Mansur Subagyo Pramumijoyo Subagyo Pramumijoyo Subagyo Pramumijoyo Subagyo Pramumijoyo, Subagyo Subagyo Subagyo Subagyo Subagyo Subagyo Subagyo Subagyo Subagyo Sufriadin, Sufriadin Sujangka, Arsyad Sukadana, I Gde Sukamandaru Prihatmoko Sukamandaru Prihatmoko, Sukamandaru Sukmandaru Prihatmoko Sukmandaru Prihatmoko Supit, Jance Mudjani Suryawan, Eka Harris Sutarto Sutarto Sutarto Sutarto Sutarto Sutarto Sutarto Sutarto Sutarto Sutarto Sutijan Sven Sindern Syafruddin Maula Syafruddin Maula Takahashi, Ran Takahashi, Ryohei Tamba, Fenny Thamba, F. Theo Van Leeuwen Theresia Fernandha Samuels Thwee Aye, May Timotius, Daniel Tun, Myo Min Ubaidillah, Aji Syailendra Wahyu Widodo Wahyu Widodo Waterman Sulistyana Bargawa Wawan Budianta Wibowo, Decka Pynka Win Kant Win Khant Wiwit Suryanto Yonezu, Kotaro Yu Yu Myaing Yuni Kusumastuti, Yuni Yurniadi, Feddy Yuyun Prihatining Rahmah