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All Journal Jurnal Ilmu Lingkungan 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 Jurnal Indonesia Sosial Teknologi 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 Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Arifudin Idrus
Departemen Teknik Geologi Fakultas Teknik Universitas Gadjah Mada
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The Geological Structures Formed Influence the Process of Mineralization in the Beruang Kanan Area, Gunung Mas Regency, Central Kalimantan Retno Anjarwati; Sutarto Sutarto; Dwi Fitri Yudiantoro; Arifudin Idrus
Jurnal Indonesia Sosial Teknologi Vol. 5 No. 11 (2024): Jurnal Indonesia Sosial Teknologi
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jist.v5i11.8775

Abstract

The Schwaner Mountains stretch in the middle. Identification of geological structures that play a role in the formation of metallic mineral deposits is necessary for more efficient mining exploration and exploitation. The Right Bear is a mining site located on a remote hill in the central part of the island of Kalimantan. This study aims to determine the condition of geological structure and the influence of geological structure on the distribution of copper mineralization at the research site. In this study, surface data was collected in the form of lithological description data and data on the structure of bridles and veins in rocks. The equipment used is a geological compass, a geological hammer, GPS, a magnifier, and others. In general, the stratigraphy of the research area is divided into 3 rock units that can be seen on the geological map, in order from old to young, namely the lithology of the Sandstone Unit, the Dacitic Tuf Unit, the Andesite Unit, and the Quartz Sand Deposit Unit. The mineralization of the Right Bear area consists mainly of high Cu sulfide mineralization. It is related to copper mineralization. Associated mineralization is generally controlled by bridle and fault structures. Mineralization is hosted by volcanic and volcaniclastic rocks in the research area, especially in the middle and southeast of the research area. The geometry of a vein with a width of > 1 cm is called a vein, if it is < 1 cm wide it is called a vein and if it is < 1 mm it is called a vein cord. These veins generally have the direction NNE SSW, NE-SW, NW-SE and WNW-ESE.
The use of sequential extraction procedure for mercury fractionation study in gold mining tailings: implications for environmental pollution Budianta, Wawan; Idrus, Arifudin; Hakim, Fahmi; Resurrection, Augustus C.; Hinode, Hirofumi
Journal of Degraded and Mining Lands Management Vol. 13 No. 2 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.132.10091

Abstract

Artisanal and small-scale gold mining (ASGM) activities still use mercury (Hg) for the amalgamation processing step. These ASGM activities generate tailings as a mining by-product, representing the primary source of environmental Hg contamination. The purpose of this study was to investigate Hg concentrations in several tailing ponds and analyze the fractionation of Hg in tailings in ASGM on Banyumas District, Central Java, Indonesia. In total, 15 tailings samples were taken from the ASGM tailings storage pond in the study area, and then the total Hg concentration was measured using cold vapor atomic fluorescence spectrometry (CVAFS). Hg fractionation was also performed using CVAFS. The results showed that the total Hg concentration in the tailing pond was very high, exceeding the normal background levels in rock or sediment due to ASGM activities. The fractionation analysis conducted to determine Hg mobility showed that almost all samples were concentrated in the first and second fractions, which had negative environmental effects. The findings from the mercury speciation analysis highlight the critical need for enhanced monitoring of gold mining operations and for implementing responsible tailings management strategies to prevent environmental pollution and protect ecosystem health in the study area.
Geochemical and Mineralogical Insights into Hydrothermal Alteration in the Beruang Kanan Non-Vulcanic Area, Central Kalimantan, Indonesia Retno Anjarwati; Sutarto Sutarto; Dwi Fitri Yudiantoro; Arifudin Idrus; Emi Prasetyawati Umar
International Journal of Hydrological and Environmental for Sustainability Vol. 4 No. 2 (2025): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v4i2.767

Abstract

Previous studies have revealed significant hydrothermal alterations within the Beruang Kanan Non-Volcanic Area, Central Kalimantan, Indonesia, resulting in extensive ore mineralizations. This study aims to examine the effects of hydrothermal processes on rock alteration, delineate alteration zones, and establish their relationship to metal mineralization. The research area, situated in the Tumbang Miri district of Gunung Mas regency, forms part of the Corrugated Hills Geomorphological Unit and is traversed by the Schwaner Mountains, with elevations ranging from approximately 50 to 400 meters. Stratigraphic analysis identifies three primary rock units, ordered from oldest to youngest: the Tuffaceous Sandstone Unit, the Dacitic Tuff Unit, and the Andesite Unit. Hydrothermal alterations have resulted in three distinct alteration zones sericitic, argillic, and propylitic characterized by secondary mineral assemblages. This study provides a comprehensive framework for understanding the geological and mineralization dynamics of non-volcanic hydrothermal systems in Central Kalimantan, Indonesia
The The First Occurrence of Mafic Alkaline Rock (Lamproite) in The Mamuju District, West Sulawesi, Indonesia: Implications for The REE and Critical Elements Enrichment Fadlin Fadlin; Shaban Godang; Arifudin Idrus; Hill Gendoet Hartono; Januar Aziz Zaenurrohman; Raden Muhammad Asfaro; Wildan Nur Hamzah; Hernani Vitorino Nhatinombe
Indonesian Journal on Geoscience Vol. 13 No. 2 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.2.199-219

Abstract

Mafic alkaline igneous rocks, along with their weathering products, are a significant source of Rare Earth Elements (REEs) and critical elements. One of the mafic alkaline rock-related REE and critical element sources is lamproite. Various methods were utilized in this study, including optical microscopy, X-ray diffraction (XRD), and scanning electron microscopy with Energy Dispersive Spectroscopy (SEM-EDS), as well as whole-rock geochemical analyses using X-ray fluorescence (XRF) and Inductively Coupled Plasma Mass Spectrometry/Optical Emission Spectroscopy (ICP-MS/OES). Based on mineralogical observations, it has been confirmed that the dykes from West Sulawesi are orendite-type lamproite rocks. Sanidine, phlogopite, diopside, and aegirine are the main minerals found in these rocks, including apatite and oxide minerals as accessory minerals. The dykes' whole-rock geochemistry indicates an ultrapotassic nature with a K₂O/Na₂O ratio > 3. Lamproite dykes display an increase in the large ion lithophile elements (LILEs) and a decrease in Ti, Sr, and P, with minimal Eu anomalies. They also show an increase in the light rare earth elements (LREEs), ranging from 901 to 1558 ppm, and a significantly higher content of Zr (968-3083 ppm), Th (152-408 ppm), and U (30-37 ppm). The dykes are related to an orogenic lamproite that formed during post-collisional tectonic continental extension. It contained a significant amount of REE-Zr-Th-bearing minerals, such as apatite (La-Ce-Nd), zirconosilicate (Zr-Ce), and Ba-perovskite (Zr-Th-Ce-Tb). The enrichment of light rare earth elements (LREEs), thorium (Th), and zirconium (Zr) in these dykes can be attributed to both primary and secondary enrichment processes, such as metasomatism and hydrothermal alteration. This phenomenon is evidenced by mineral replacement textures or pseudomorphs, as well as a skeletal texture resulting from rapid cooling in a hydrothermal fluid environment. Therefore, understanding the formation of mafic alkaline rocks, especially lamproite, and their role in enriching REEs and critical elements is a crucial future scientific goal.
EVOLUSI FLUIDA HIDROTERMAL-MAGMATIK PADA PROSPEK PORFIRI-EPITERMAL Cu-Au RANDU KUNING, SELOGIRI, JAWA TENGAH, INDONESIA:KAJIAN BERDASARKAN STUDI INKLUSI FLUIDA: MAGMATIC-HYDROTHERMAL FLUID EVOLUTION IN THE PORPHYRY-EPITHERMAL CU-AU RANDU KUNING PROSPECT, SELOGIRI, CENTRAL JAVA, INDONESIA: INSIGHTS FROM FLUID INCLUSION STUDIES Sutarto; Arifudin Idrus; Agung Harjoko; Lucas Donny Setijadji; Sven Sindern
Buletin Sumber Daya Geologi Vol 21 No 2 (2026): 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.v21i2.608

Abstract

The Randu Kuning Prospect, located in the Southern Mountains Zone of East Java, Indonesia, represents a magmatic-hydrothermal mineralization system that evolved from a porphyry environment to a shallow-level epithermal system. The prospect is hosted by volcaniclastic, siliciclastic, and carbonate rocks of the Mandalika and Semilir Formations, which are intruded by numerous dioritic bodies related to Late Eocene–Early Miocene magmatism. This study aims to reconstruct the evolution of ore-forming fluids based on fluid inclusion characteristics and their relationship to hydrothermal alteration and mineralization. Fluid inclusion analyses were conducted on ten vein samples representing both porphyry and epithermal environments using a Linkam heating-freezing stage. To support the interpretation, petrographic, X-ray diffraction (XRD), QEMSCAN, X-ray fluorescence (XRF), and ICP-MS analyses were also performed. The fluid inclusion data indicate that the hydrothermal system evolved through three major stages. The early porphyry stage was characterized by high-temperature and high-salinity fluids, with homogenization temperatures of approximately 600°C and salinities ranging from 16 to 72 wt.% NaCl equivalent. These fluids were associated with A-type and M-type quartz veins and potassic alteration assemblages. During the intermediate porphyry stage, fluid temperatures decreased to approximately 300–350°C, while salinities ranged from 16 to 48 wt.% NaCl equivalent. This stage was associated with sulfide-bearing quartz veins (AB-type and C-type veins) and phyllic as well as chlorite–magnetite–sericite alteration assemblages. The late porphyry to epithermal stage was characterized by lower temperatures (200–350°C) and lower salinities (2.31–36.74 wt.% NaCl equivalent), resulting in the formation of D-type veins, carbonate–pyrite–sphalerite–chalcopyrite veins, and other epithermal-style veins accompanied by propylitic, intermediate argillic, and locally developed advanced argillic alteration. The progressive decrease in temperature and salinity indicates continuous evolution of the hydrothermal fluids from porphyry c to a shallower epithermal environment, thought to be primarily controlled by cooling and mixing processes with meteoric water.
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 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 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 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 Meyer, Franz Michael Godang, Shaban Godang, Shaban Hakim, Fahmi 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 Herfien Samalehu Hermansyah, Wahyu Hernani Vitorino Nhatinombe Hidayatullah Hidayatullah Hill Gendoet Hartono Hill Gendoet Hartono Himawan Tri Bayu Murti Petrus Hinode, Hirofumi 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 Nur, Irzal Isyqi Isyqi Iwan Setiawan Iwan Setiawan Iwan Setiawan Iwan Setiawan Januar Aziz Zaenurrohman Jochen Kolb Johan Arif Johan Arif, Johan Johan Syafri Mahathir Ahmad 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. Mega Fatimah Rosana 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 Ni’matul Azizah Raharjanti Nugroho Imam Setiawan Nugroho 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 Prastistho, Widyawanto Pratiwi, Fadiah Pratomo, Septyo Uji Priadi, Bambang Prihatmoko, Sukmandaru Putranto, Sapto Putranto, Sapto Putranto, Sapto Raden Isnu Hajar Sulistyawan, Raden Isnu Hajar Raden Muhammad Asfaro Rahmah, Yuyun Prihatining Rahmayuddin Rahmayuddin Rahmayuddin, Rahmayuddin Rama Danny Rangga Bintang Ardaraja Rangga Bintang Ardaraja Resurrection, Augustus C. Retno Anjarwati Retno Anjarwati 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 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, Sufriadin Sujangka, Arsyad Sukadana, I Gde Sukamandaru Prihatmoko Sukamandaru Prihatmoko, Sukamandaru Sukmandaru Prihatmoko Sukmandaru Prihatmoko Sukmandaru Prihatmoko Supit, Jance Mudjani Suryawan, Eka Harris Sutarto Sutarto Sutarto Sutarto Sutarto 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 Widyawanto Prastistho Wildan Nur Hamzah Win Kant Win Khant Winarto Kurniawan Wiwit Suryanto Yonezu, Kotaro Yu Yu Myaing Yuni Kusumastuti, Yuni Yurniadi, Feddy Yuyun Prihatining Rahmah