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All Journal Record and Library Journal Lentera Pustaka Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Khazanah: Jurnal Pengembangan Kearsipan Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Dhatu Kamajati, Dhatu
Unknown Affiliation
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Social Sciences

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Geostatistical Ore Body Modeling on Uranium Mineralization in Remaja Sector, Kalan Area, West Kalimantan Ciputra, Roni Cahya; Heriawan, Mohamad Nur; Syaeful, Heri; Kamajati, Dhatu; Rahmawati, Putri
EKSPLORIUM Vol. 43 No. 1 (2022): MAY 2022
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2022.43.1.6622

Abstract

Manual ore body modeling on Remaja Sector, Kalan, West Kalimantan generally takes a long time and is subjective. On the other hand, automatic modeling (implicit modeling) is faster, objective, and equipped with uncertainty factors. This study aimed to analyze the comparison between the geostatistical Sequential Indicator Simulation (SIS) ore body model to the manual ore body model. The lithology database was used as input for variogram analysis and SIS simulation. The directional variogram was used to construct an experimental variogram for the lithology with orientation data. The orientation of the lithologies corresponds to the anisotropy of their variogram map. The SIS was carried out in Block A and Block B with block sizes of 6×6×6 m3 and 5×5×5 m3 respectively. The simulation results were processed to produce a lithology probability model. By using maximum probability as block lithology, simulation results were well validated by the composite database histogram, the lithologies along the tunnel on the geological map of level 450 masl of Eko Remaja Tunnel., and the lithologies along boreholes. The weakness of the geostatistical ore body model was the results depending on the input parameters. Meanwhile, several advantages of the geostatistical ore body model were a faster processing process, equipped with an uncertainty factor, and the block size of the model has taken into account the distance between grade data so that it can be used directly for grade estimation. Quantitatively, the geostatistical ore body model had a higher average percentage of conformity to the lithology of the mineralized zone along the borehole than the manual ore body model
Lithological Discrimination Based on Radiometric Data: Case Study of Rabau Sector, West Kalimantan and Salumati Sector, West Sulawesi Maulana, Muhammad Wira; Ciputra, Roni Cahya; Iskandarsyah, Iskandarsyah; Adimedha, Tyto Baskara; Sukadana, I Gde; Indrastomo, Frederikus Dian; Syaeful, Heri; Pratiwi, Fadiah; Rachael, Yoshi; Mardania, Faneza Nur; Kamajati, Dhatu; Rahmawati, Putri; Garwan, Mirna Berliana
EKSPLORIUM Vol. 46 No. 1 (2025): MAY 2025
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2025.11475

Abstract

This study evaluates the applicability of radiometric methods for lithological discrimination in tropical environments, with a focus on two uranium exploration sites in Indonesia: the Rabau Sector in West Kalimantan and the Salumati Sector in West Sulawesi. These locations were selected to represent various lithologies within the uranium exploration program. The aim is to determine whether gamma-ray spectrometry, commonly effective in arid environments, can also delineate lithological boundaries and alteration zones under conditions of intense weathering and dense vegetation cover of tropical area. Ground-based radiometric data were collected using the RS-125 gamma spectrometer to record the concentration of potassium (K), equivalent uranium (eU), and equivalent thorium (eTh). Data processing involved anisotropy analysis, geostatistical interpolation using ordinary kriging, ternary RGB composite mapping, and delineation of radiometric domains. The resulting radiometric maps were then qualitatively compared with existing geological maps for validation. The results show that radiometric signatures, particularly eTh and eU, can effectively distinguish rock units with differing genesis or degrees of alteration, despite tropical conditions. In Rabau, where lithologies share a common protolith, elevated eU concentrations correspond to hornfels, while metatuff and metasiltstone remain indistinguishable, indicating the influence of thermal metamorphism on radiometric responses. In Salumati, eTh and eU zoning within phonolite suggest compositional variability or differential alteration, and elevated eU in altered tuff reflects uranium remobilization in smectite-rich zones. These findings demonstrate that, despite the challenges posed by tropical climates, radiometric mapping remains a viable tool for lithological discrimination and early-stage uranium exploration in Indonesia. This work extends the application of radiometric techniques beyond arid environments and underscores the need to integrate radiometric interpretation with genetic, provenance, and alteration context in tropical geological mapping.
Archival metadata practices and challenges in managing digital manuscripts As'ad, Muhammad; Indrawardani, Ken Fitria; Cahyaningrum, Gita Amalia; Kamajati, Dhatu
Record and Library Journal Vol. 11 No. 2 (2025): December
Publisher : D3 Perpustakaan Fakultas Vokasi Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/rlj.V11-I2.2025.359-373

Abstract

Background of the study: Metadata plays a critical role in ensuring the accessibility, interoperability, and long-term preservation of digital manuscripts within archival collections. However, inconsistent practices across institutions present significant challenges for standardization and archival sustainability. Purpose: This study aims to identify key challenges in manuscript metadata management within archival contexts and to analyze differences in practices across selected national and international repositories. Method: A qualitative descriptive approach was employed through literature review and document analysis of approximately 50 metadata records. Data were collected from five repositories—Khastara (National Library of Indonesia), BRIN Digital Repository, the British Library, Europeana, and UNESCO Memory of the World—and analyzed thematically to identify recurring patterns and gaps. Findings: Repositories highlight different metadata priorities: Khastara emphasizes descriptive details, BRIN focuses on administrative and technical identifiers, the British Library provides strong provenance and historical context, Europeana prioritizes rights and interoperability, and UNESCO underscores heritage significance and preservation. These variations illustrate the archival challenges of achieving consistent metadata standards. Conclusion: The study highlights the importance of cross-institutional alignment in strengthening sustainable archival metadata practices. Theoretically, it situates metadata as both a technical and cultural construct; practically, it offers insights for archival institutions to improve strategies. Future research should expand repository coverage and involve user perspectives on archival access and use.
Co-Authors . Iskandarsyah Adimedha, Tyto Baskara Agus Handoyo Harsolumakso, Agus Handoyo As'ad, Muhammad Asep Saepuloh Cahyaningrum, Gita Amalia Cakrabuana, Wira Ciputra, Roni Cahya Damaledo, Ebenheser Dwi Haryanto Dwi Ridho Aulianto Faizah, Yuni Frederikus Dian Indrastomo, Frederikus Dian Heri Syaeful Heriawan, Mohamad Nur I Gde Sukadana Indrawardani, Ken Fitria Luky Adrianto Mardania, Faneza Nur Maulana, Muhammad Wira Mirna Berliana Garwan, Mirna Berliana Prasetyo, Gagah Hari Pratiwi, Fadiah Putri Rahmawati Rachael, Yoshi Rokhmat, Miftahu Wijaya, Allen Relyan