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Distribution mapping of metal sediment using polarization data interpretation on the field “X” in PT Newmont Nusa Tenggara (PT NNT) Sukri Arjuna; Adi Susilo; Sunaryo S
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 01 (2014): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v4i01.1174

Abstract

Geophysical research has been done on mapping distribution of metal deposits in the field "X" PT Newmont Nusa Tenggara using induced polarization geoelectric method pole-dipole configuration. Measurements performed using IRIS intrument type Elrec Pro where measurements of seven lines with length 2.3 km and electrode spacing 100 m. Induced polarization data furtheranalyzed by using Res2dinv version 3.56 and Surfer 10. Interpreted based on the parameters of chrageability and resistivity that correlated with regional geological information from the study area. As a result, the structure of rocks beneath the surface lithology research area consists of five units major rock that is tuffan claystone unit, sandstone tuffan unit, limestone unit, lava-brecciaunit, and andesite-basalt unit. Mineralization zone at the high chargeabilitas at 69.7 to 155 msec range supported by the low resistivity in the range of 4.21 to 26.5 Ωm which straight of anomalies in West-East direction at the depth of ± 50-400 m.
Assessment of Geodiversity Values of Banyu Anjlok, Malang Regency, as a Potential Geological Heritage Faris, Ahmad Najmi; Adi Susilo; Alexander Tunggul Sutan Haji; Izza Safira
Frontier Advances in Applied Science and Engineering Vol. 2 No. 2 (2024)
Publisher : Tinta Emas Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59535/faase.v2i2.368

Abstract

Banyu Ajlok is one of the tourist destinations in Purwodadi Village, Tirtuyudo District, Malang Regency. Banyu Anjlok is located in the southern mountainous area, this area shows the existence of ancient volcanic activity from the south of Java which causes Banyu to have a geodiversity that can be used as a geological heritage. The purpose of this study is to identify geodiversity in the Banyu plummeting area as the basis for geological-based tourism development. The methods used include geological surveys and assessments of geological values using the technical guidelines of the Geological Survey Center by the Geological Survey Center which include scientific values, educational values, tourism values and risk of degradation. The results showed that the lithology of Banyu plummeted including andesite, basalt, ryolite, andesite breccia, sandstone, grandiorit and plant fossils. In addition, geological structures that can be found are  joints. The assessment results show a scientific value of 76.25%, an educational value of 75%, a tourism value of 66.25% and a risk of degradation of 235. Based on the results of the assessment, Banyu plummeting has potential as a geological heritage site in terms of geological diversity and risk of degradation.
THREE-DIMENSIONAL RESISTIVITY MODEL FOR GROUND WATER EXPLORATION IN VOLCANIC ZONE OF TIDAR PLETEAU, MALANG, EAST JAVA Irwan, Irwan; Ilham; Adi Susilo
Indonesian Physical Review Vol. 3 No. 1 (2020)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v3i1.39

Abstract

Geoelectrical resistivity method is popular technique for subsurface mapping of groundwater, mining exploration, and structural geology. For case study in Tidar Plateau which characterized by hard rock of volcanic breccia, lava, tuff, and conglomerate,  the groundwater system occurs only by the secondary porosity (faulting, facturing, and weathering). Therefore it becomes difficult task for determine position of good well site in Tidar Plateau. Geoelectrical technique by Schlumberger configuration was choosen to investigated the ground water system in this area. Total 5 Vertical Electrical Sounding (VES) acqusition point (400 m length measurement; spacing 10 m) for data measurement with coverage area about 400 x 400 m2. For data processing was used IP2Win, Progress3, and RockWork 16.  The data processing results showed high accuration with avarage Root Mean Square (RMS) error about 0.3 – 8.3 %. According to resistivity results, the study area has resistivity between  0.3– 2.5x104 . The rocks which have resistivity between 0.3 – 12.52  interpreted as sandy-clay; 12.52 – 50  interpreted as wet sandstone (aquifer); 129 – 178  interpreted as conglomerat; 700 – 1300  interpreted as tuff, sand, and dry gravel; 2600 – 2.5x104  interpreted as volcanic breccia. This geoelectrical results has succesful finding the fresh water at VES 5 after drilled at depth 100 m at wet sandstone formation. To findout distrubution of aquifer layer, a three-dimensional (3D) resistivity model was developed. The 3D resistivity model shows the aquifer layer image look the dome-like structure and image the fracture regions which becomes the pathway of groundwater system.Â