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All Journal JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Cakrabuana, Wira
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology

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Identification of the Aquifer Occurrences in Sungai Raya and Its Surroundings, Bengkayang, West Kalimantan Cakrabuana, Wira; Fauzi, Rachman; Karunianto, Adhika Junara; Muhammad, Adi Gunawan; Widodo, Widodo
Jurnal Lingkungan dan Bencana Geologi Vol 13, No 3 (2022)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v13i3.417

Abstract

A hydrogeological study was carried out in Sungai Raya Village, Bengkayang Regency, West Kalimantan Province. The objectives of the study were to identify the occurrences of the aquifer in Sungai Raya, along with its type, depth, distribution, and quality. The methods used in this study were literature studies of geological data and geoelectrical measurement. Based on the literature study, it was known that the study area, from the oldest to the youngest, consists of andesite, granodiorite, diorite, quartz sand deposit, littoral deposit, and alluvial deposit. Based on the geoelectrical measurement, it resulted that most of the subsurface layers recorded by the instrument are alluvial deposit (characterized by their low-resistivity value) which is underlaid by the bodies of igneous rocks, i.e. diorite and andesite (characterized by its high-resistivity value). Based on the comprehensive analysis, there are two aquifers in the study area, they are alluvial deposit and quartz sand deposit. Both of them are unconfined aquifers. The aquifers can be found at the surface to the depth of ±100 m. It can be inferred that the aquifers relatively deepen to the north and east. The quartz sand deposit is a better aquifer since it has better sorting and more-open fabric than the alluvial deposit which provides the deposit a larger capacity for storing and transmitting groundwater.
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.
Karakterisasi Hidrogeologi Daerah Sekitar Tapak PLTN di Bengkayang, Kalimantan Barat Muhammad, Adi Gunawan; Fauzi, Rachman; Karunianto, Adhika Junara; Cakrabuana, Wira; Widodo
EKSPLORIUM Vol. 42 No. 2 (2021): NOVEMBER 2021
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2021.42.2.6479

Abstract

Site evaluation is an important phase of site selection for commercial-scale nuclear power plants (NPP) in Indonesia. Geotechnical and radioactive material dispersion aspects are some of the aspects which are assessed in site evaluation under provisions of laws and regulations. To support those aspect evaluations, it is necessary to conduct hydrogeological characterization in the vicinity of the NPP site. The purpose of this study is to determine the hydrogeological characteristic of the vicinity of the NPP site in Bengkayang Regency, West Kalimantan Province based on geological and geophysical aspects. The methods of this study consist of geomorphological mapping, geological mapping, hydrogeological mapping, geoelectric measurement, and integrated analysis. The study area consists of three morphological units: alluvial plain, isolated hills, and coastal plain. Stratigraphically, the lithology units of the study area, from the oldest to the youngest, consist of andesite, granodiorite, diorite, quartz sand deposits, coastal deposits, and alluvial deposits. The geophysical measurement used is the geoelectric method which is conducted at 12 electrode arrays with 470 m length and spacing of 10 m. In the geoelectrical section, it can be seen that several anomalies can be interpreted as the fractured body of igneous rocks or the diorite intrusion in andesite. These anomaly values are ranged from 300 Wm to >8000 Wm. The relatively low resistivity values (<30 Wm) are interpreted as water saturated-alluvial deposits that could have a thickness of ±100 m. There are three hydrogeological units in the study area: aquifers in which flow is intergranular with high permeability, aquifers in which flow is intergranular with moderate permeability, and aquifug of local importance. Generally, the groundwater in the study area flows from SSW to NNE.
Analysis of Rock Mass Quality and Support Requirements Using Q-System – Case Study: Kalan Uranium Exploration Tunnel, West Kalimantan, Indonesia Cakrabuana, Wira; Dinata, Indra Andra; Faizah, Yuni; Kamajati, Dhatu; Rahmawati, Putri
EKSPLORIUM Vol. 46 No. 2 (2025): NOVEMBER 2025
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2025.13575

Abstract

The Kalan uranium exploration tunnel was one of the nuclear minerals research facilities in Indonesia. This 618 m long tunnel, located in West Kalimantan, Indonesia, was built on Eko Remaja Hill and operated from 1980-2021. In this tunnel, uranium mineralization occurs as irregular veins (stockworks) in metasiltstone and metapelite. The high density of these veins causes the formation of several weak zones in the tunnel. These weak zones cause rock and soil failures at several locations in the tunnel. The study aims to evaluate the quality of the rock mass surrounding the tunnel and determine the support requirements necessary to prevent further structural failures. Scanline surveys were carried out in several zones that have not experienced failures to obtain Q-system parameters. Based on the results of the analysis, the rock mass that makes up the Kalan tunnel has a Q value of 0.61–48.22, so that it belongs to the class of very poor-very good rocks. By plotting the Q value with its equivalent dimension (ED) on the rock support chart, it is estimated that the support required by the tunnel is average bolt spacing without fiber-reinforced sprayed concrete. The ultimate pressures of the roof and wall support can bear are 0.04–0.24 MPa and 0.03–0.17 MPa, respectively.
Co-Authors Adhika Junara Karunianto Adi Gunawan Muhammad Dhatu Kamajati, Dhatu Dinata, Indra Andra Faizah, Yuni Fauzi, Rachman Putri Rahmawati Widodo Widodo Widodo