Buletin Sumber Daya Geologi http://buletinsdg.geologi.esdm.go.id/index.php/bsdg <p>Buletin Sumber Daya Geologi is a scientific journal focusing on studies and research in the field of geological resources, particularly minerals, fossil energy, and geothermal energy. The journal aims to serve as a platform for publishing current and relevant research to support the advancement of science and technology in the geology sector.</p> <p>This journal is published three times a year, in May, August, and November, with a print ISSN of 1907-5367 and an electronic ISSN of 2580-1023. Buletin Sumber Daya Geologi has been accredited by the Ministry of Research, Technology, and Higher Education (Kemenristekdikti). In 2020, the journal achieved a Level 2 ranking as a Nationally Accredited Scientific Journal, valid for five years.</p> <p>Each article published in this journal is assigned a DOI with the prefix 10.47599, ensuring integrity and ease of citation. Through a rigorous peer-review process, Buletin Sumber Daya Geologi delivers high-quality articles that serve as valuable references for academics, practitioners, and policymakers in the field of geology.</p> <p>The journal invites authors to contribute research articles, particularly those relevant to the themes of minerals, fossil energy, and geothermal energy.</p> Pusat Sumber Daya Mineral Batubara dan Panas Bumi en-US Buletin Sumber Daya Geologi 1907-5367 <p class="" data-start="52" data-end="125"><strong data-start="52" data-end="125">Authors whose manuscripts are published agree to the following terms:</strong></p> <p class="" data-start="127" data-end="357">The publication rights of all journal manuscript materials published on the <em data-start="203" data-end="232">Buletin Sumber Daya Geologi</em> website are held by the editorial board with the knowledge of the author (moral rights remain with the manuscript’s author).</p> <p class="" data-start="359" data-end="811">The formal legal provisions for access to digital articles in this electronic journal are subject to the terms of the <strong data-start="477" data-end="531">Creative Commons Attribution-ShareAlike (CC BY-SA)</strong> license. This means that <em data-start="557" data-end="586">Buletin Sumber Daya Geologi</em> has the right to store, convert media/formats, manage in the form of a database, maintain, and publish the article without requesting permission from the author, as long as the author’s name is cited as the copyright holder.</p> <p class="" data-start="813" data-end="1054">Manuscripts published in both print and electronic formats are <strong data-start="876" data-end="891">open access</strong> for educational, research, investigative, and library purposes. Beyond these purposes, the editorial board is not responsible for any violations of copyright law.</p> KONTROL STRUKTUR TERHADAP ALTERASI DAN MINERALISASI PADA CEBAKAN EPITERMAL PROSPEK SECANG, KECAMATAN CAMPUR DARAT, KABUPATEN TULUNG AGUNG, PROVINSI JAWA TIMUR http://buletinsdg.geologi.esdm.go.id/index.php/bsdg/article/view/BSDG_VOL_20_NO_2_2025_1 <p><em>The study area is located within the administrative district of Campurdarat Subdistrict, Tulungagung Regency, East Java Province. This research aims to analyze the role of geological structures on alteration and mineralization processes using geological and alteration mapping method, joint measurement, petrographic and mineragraphic analysis, and spectral data interpretation. The geological mapping results indicate that the lithostratigraphy of the study area, from youngest to oldest, consists of Alluvial Unit (Sa), Limestone Unit (Sbg), Volcanic Breccia Unit (Sbv), and Andesite Lava Unit (Sla). The geological structures include faults and joints, formed through a wrench fault mechanism, indicating left-lateral movement with the formation of a transpressional pop-up structure. Alteration zones belong to the high-sulfidation epithermal deposit system, consisting of four alteration types, comprising silicifaction, advanced argillic, argillic, and propylitic. Mineralization in the study area is associated with veins and vuggy quartz. Ore minerals present include pyrite, chalcopyrite, sphalerite, marcasite, magnetite, rutile, and covellite. Alteration and mineralization in the study area are controlled by northeast-southwest and northwest-southeast strike-slip faults. Faults in the study area have caused alteration overprinting and fault zones.</em></p> Rizqi Fadilah Agata Vanessa Aton Patonah Iyan Haryanto Copyright (c) 2025 Buletin Sumber Daya Geologi https://creativecommons.org/licenses/by-nc-sa/4.0 2025-07-25 2025-07-25 20 2 75 93 10.47599/bsdg.v20i2.519