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Journal : Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir

Analisis Kualitas dan Perkuatan Terowongan Eksplorasi Uranium Eko Remaja Kalan, Kalimantan Barat menggunakan Metode RMR (Rock Mass Rating) Faizah, Yuni; Cakrabuana, Wira; Kamajati, Dhatu; Rahmawati, Putri
EKSPLORIUM Vol. 41 No. 1 (2020): MEI 2020
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2020.41.1.5859

Abstract

Tunnel for Exploration of Uranium Eko Remaja Kalan (TEURK) in West Kalimantan, built-in 1980, is one of the uranium deposit research facilities in Indonesia. The tunnel penetrated Eko Remaja Hill along 618 m, from Remaja to TRK-7 access. Uranium mineralization in this area controlled by dense stockwork veins on metasilt and metasandstone rocks. The high-dense geological structures create some weak zones in the tunnel. These zones are potentially causing rocks and soil slides. Temporary supports made of wood-piles were installed in these zones to support the tunnel. Currently, these piles are not capable at the tunnel, so that rocks and soil slides occurred inside the tunnel. The research aimed to determine the quality of actual rock mass and determine the appropriate type of reinforcement to keep the tunnel safe. Schmidt hammer and scanline surveys on the unsupported zone (50–297 m and 355–538 m depth) carried out to collect the classification parameter data of Rock Mass Rating (RMR). The measurement result shows that the rock mass of TEURK on the depth has an RMR value of 52–71 (fair-good). Reinforcement recommendations for the tunnel are rock bolts and conventional shotcretes installation.
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.
Co-Authors . Iskandarsyah Abi Waqqosh Abu Fatah Kurniawan, Fadhilah Aci, Intan Pandini Ade Kurniawan Adel Karen Dwita Adiansyah, Adi Adimedha, Tyto Baskara Adinda Sawitri Adisti Fitriyani Agustin, Abelia Agustina , Sofyya Agustina, Sofyya Ahsani, Eva Luthfi Fakhru Aisyah Rahmadani Aji Lukman Ibrahim Akustika, Salsabillah Alfani, Tsania Nuha Alisa Dewi Rahmawati Allisa, Safiah Alpindo Gustiawan Amalia, Annida Aminuyati Andriyani, Evita Ayu Arif, Fikri Khoirul Arifah, Muthi’ah Arrifah Miranti Athoillah, Fikri Aziz Atika Atika Aulia Tsania Auliya, Rikzatul AYU LESTARI Aza Afrilia Azizah Azizah, Rizky Annisa' Azzahra Nur Khoiriyah Bagus Nurul Iman Bahrudin, Maulana Azis Banta Ali Baroroh Sofiati Billah, Mu’tasim Budiharti Cakrabuana, Wira Charli, Chintya Ones Chayati, Indry Choirul Amin Ciptandriyo, Petrus Andi Ciputra, Roni Cahya Deri Anggraini Dewianti, Azelia Dhatu Kamajati, Dhatu Dyah Ika Kirana Jalantina Edilburga Wulan Saptandari Effriyanti, Effriyanti Elida Elfi Barus Ely Elsanti Ervi Rachma Dewi Fadli, M Rizal Fahreza , Muhammad Nouval Raya Fahreza, Muhammad Nouval Raya Faizah, Yuni Fathina, Rafa Azzahra Fatin, Salsabilla Febriyanti, Zahara Feriskinanti, Pamesti Ajeng Firda Fauziyyah Fitra Nengsih Fitri Kurnia Fitriadi Fitriadi Fitriani, Baiq Yati Fitriyani, Windy Fourinta, Ananda Frederikus Dian Indrastomo, Frederikus Dian Ganis Vitayanty Noor Ghilman Kharizi Gusparenady, Rachel Calista Hamdani, Nizar Alam hamsa, amrizal Hani Humaeriyah Hapsari Windayanti Haris Mayudaee Hartita, Yuyun Hasby, Muhammad Farhan Hava Haniva Ariantara Heri Syaeful Heriawan, Mohamad Nur Herlianti, Anggun Oktavia Herlinanur, Nanda Hilma Marisa I Gde Sukadana Imanu Massu Barlinti Inayatillah Inayatillah INDRAYANI INDRAYANI Isnawati Isnawati Istania Widayati Hidayati Jamilah Aini Nasution Juniarti, Nola Tri Kaddafi, Muamar Kamelia Quzwain Khabibah, Ummy Khanafiah, Melly Kharisma Mutiara Dewi Kharullah , Ilham Kharullah, Ilham Khofifah, Nur Kholifah , Umi Kholisah Mardhiyah Kumalahayati, Nur Kurniawan, Anugallakata Nea Sasgapata Kusuma Wardhani, Febrianti Kusuma, Aditama Candra Lailatul Ma’wa Lestari, Heni Dwi Lia Hafiza Loekman Mohammadi Loso loso M. Hakim Al Juon Mahasri Shobahiya, Mahasri Malika Latifah Salma Mardania, Faneza Nur Maria Magdalena Martindo Alexander Martunis Masharyono Masharyono Maulana, Muhammad Wira Maulani, Galih Abdul Fatah Meidina Putri Meika Puji Andini Meisinta Vika Putri Mila, Zamilatul Mirna Berliana Garwan, Mirna Berliana Mirzam Arqy Ahmadi mubarok, teten mohamad sapril Muchtar, Zulfa Iftinani Muhammad Adam Nugraha Muhammad Hilman Mujahidun, M Munashiva, Nur Shifiya Muthia Tsabita Nabila Ramadhani Nada Salma Salsabila Najwanuddin, Muhammad Wildan Nanda Herlianur Nanda Tiara Dewi Naomi Boru Tobing Natalia Nealam Callista Nelly Budiharti Ni’mah, Nahdlotun Nisah, Raodatul Nispiani, Nurlaela Noveni, Nia Anggri Noviyani, Nelli Noviyanti, Adelia Nunuk Hariyati Nur Indah Sari Nur Khotimah, Isnaini Nur Oktavia, Andini Nurali Sumah, Chousadilla Nurkholish Majid Olivia, Levy Nur Pangestoeti, Wahyu Perdana , Fatkhi Zalfa Perdana, Fatkhi Zalfa Pransiska, Ririn Yulia Pratiwi, Fadiah Puriani, Risma Anita Puspahaty, Novita Putri, Mellyna Qoni'ah, Fadhilatul Qoniah, Fadhilatul R. Nur Hafriza Rachael, Yoshi Rahadewi, Andin Rahayu, Erna Rahmadi Rahmadi Rahmawati, Fidi Rahmawati, Lulu Ramli Ramli Rana Asmaul Latif Rani Mega Putri Rani Salsabila Reni Saputri Reski Apriyani Reza Ramadani Firman Rifqiyani, Lailatul Risma Alya Roshanti Rizka Rachmawati Rizkianti, Wardani Sa'adah, Naili Safrida Khoirun Nisa Salati Asmahasanah Salsabila Ilmi Rizqika Salsabila Octaviasari Sanny Andjar Sari Sari, Ayun Ratna Sasgapata Kurniawan, Annugallakata Nea Septian , Asya Ainu Septian, Asya Ainu Septiani, Dian Nabila Seruni, Atika Seshariana Rahma Melati Setiawan, Rahyuniati Shabrina , Nada Nasywa Shabrina, Nada Nasywa Shobabiya, Mahasri Sibyan, Hidayatus Siti Amalia Siti Hikmah, Siti Siti Nurhalimah Sofiyanti, Ida Sofwan Adima Nurfadillah Sri Wahyuni Suci Hayati Suci, Vitria Anjela Sulastri, Iras SUMIYATI SUMIYATI Suparmi Suparmi SYAFIYAH, MUAZARAH NASYWATU Syahriful Ahyar Syarifah Gustiawati Mukri Tamami, Fauziyah Qurrota’Ayun Tanjung, Romi Fajar Tiara Nabilazen Tina Desriani Triwoelandari, Retno Umi Kholifah Verry Cyasmoro Vicky Brama Kumbara Viola Augustia Putri Vivi Monita Wahyu Kurniawati Wahyunita, Weni Wangi, Nabila Mega Wibisono, Aldino Wibisono, Muhammad Athar Widakdo, Ridwan Widiana Nariswari, Safira Wijaya, Dzikria Afifah Primala Yazid Munawwir Zahra Shabira Nikmati Zakia, Nadhifa Rif'aldina Zulkifli Ramadhan