Page 3 (data 61 to 90 of 112) | Displayed ini 30 data/page
<< PREV 1 2 3 4 NEXT >>

61	Hydrology, hydrogeology, and geology engineering	ABS-86
Land-Use Change Impacts On Soil Erosion in Northern Part of Bandung Regency TB Thoriq Zikri Fatih, Muhammad Rafi Alkhairi, Denny Lumban Raja Geological Technology Study Program, PEP Bandung Abstract Land-use change in the Northern Part of Bandung Regency presents a significant risk of soil erosion and contributes to flooding in the city of Bandung. This purpose of this study is to identify the soil erosion risk associated with land-use change using geographic information systems by employing the revised universal soil loss equation (RUSLE) model in Cimenyan and Cilengkrang Districts. The model requires datasets to be multiplication from various sources, such as Landsat images, Digital Elevation Model (DEM), rainfall data, soil data which are then utilized as factors contributing to erosion. Each of these factors has been represented on a thematic map. Landsat satellite images from 2013, 2018, and 2023 were used to assess the land-use change. From the image analysis indicates a significant increase in agricultural zones (from 7.95% to 22.65%) and uncultivated land (from 4.50 to 13.50%). The erosion rate categorized into five classes which are very low, low, moderate, high and very high. The erosion rate rises from very low to high levels, but it decreases when it reaches the very high level (from 73.68% to 30.72%) from year 2013 to 2023. Keywords: land use change, soil erosion, USLE, Geographic Information System Share Link | Plain Format | Corresponding Author (TB Thoriq Zikri Fatih)

62	Hydrology, hydrogeology, and geology engineering	ABS-88
Identification of Confined Aquifer Layers Using the Electrical Logging Method in Artesian Wells in the Pare-Pare City Area, South Sulawesi Asta Arjunoarwan Hatta (a*), Muhammad Ramli (a), Hasbi Bakri (b) a) Mining Department, Faculty Of Engineering, Hasanuddin University Jl Poros Malino Km. 6, Bontomarannu. Gowa, South Sulawesi, Indonesia, 92171 *teknik[at]unhas.ac.id b) Mining Department, Faculty Of Industrial Engineering Jl. Urip Sumoharjo Km.5. Campus II, Indonesian Muslim University Makassar, South Sulawesi, Indonesia, 90231 *umi[at]umi.ac.id Abstract Groundwater utilization in Pare-Pare City has been intensive since 2017 until now. A case study of groundwater exploitation in Pare-pare City shows that there are 3 artesian wells. However, there is still a lack of references regarding the identification of aquifer layers in these 3 wells. An important first step in improving groundwater management is to develop an understanding of the subsurface groundwater system. Geological structures, and climatological conditions are important to study comprehensively to understand the aquifer layer system. The electrical logging measurement method (SP log and resistivity) is a method used to see in detail the vertical rock lithology. The tool used for electrical logging measurements is the Naniura Model NRD112P mini logger. The results of electrical logging show that the lithology of the 3 artesian wells consists of layers of massive and fractured volcanic breccia rock, as well as layers of lapilli tuff. Of the 3 artesian wells observed, the layer of lapilli tuff and breccia, which has a fracture structure, acts as a confined aquifer layer, while the massive volcanic breccia acts as an aquifuge layer. The resistivity value of the tuff layer is 60 - 140 &#937-m, while the volcanic breccia layer with a fractured system is 150 - 190 &#937-m. The confining layer is a massive volcanic breccia layer with a resistivity value of 210 - 390 &#937-m. Keywords: Hydrogeology- Artesian Well- Electrical Logging Share Link | Plain Format | Corresponding Author (Asta Arjunoarwan Hatta)

63	Hydrology, hydrogeology, and geology engineering	ABS-91
three-dimensional slope stability evaluation under seismic load (Case studi: Balaroa, Central of Sulawesi) Rahmat Yusup Borman (a*), Busthan Azikin (b), and Hendra Pachri (b) Departmen of Geological Engineering, Faculty of Engineering, Hasanuddin University Jalan Poros Malino Km. 6, Gowa, Indonesia Abstract The 2018 Mw 7,4 Palu earthquake was one of the largest natural disasters that has ever occurred in Indonesia. This earthquake were also triggered and followed by a large mass movement in Balaroa area. This earthquake-triggered disaster causes extensive damage to infrastructure and a huge loss of life. Slope stability evaluation under seismic conditions was one of the best solutions to prevent and mitigate the impact of the disaster. . The objective of this study was to investigate the distribution of the safety factor under the Mw 7,4 Palu earthquake condition that causes a large mass movement in Balaroa. The research methodology of the analysis is based on three-dimensional stability analysis under seismic condition using Plaxis 3D LE software. The input variables used in this research were the study area 3D modeling, soil parameters, groundwater condition, and seismic load coefficient. The result of this research shows the distribution of the safety factor along the study area with seismic and non-seismic conditions. By the distribution of the safety factor result in this area spesifies the minimum value of the safety factor that triggered a massive mass movement. In accordance to that, this safety factor value can be used in other potential areas with the same geological condition as the study area. Keywords: Slope stability, seismic load, three dimensional analysis, safety factor Share Link | Plain Format | Corresponding Author (Rahmat Yusup Borman)

64	Hydrology, hydrogeology, and geology engineering	ABS-98
Assessing the Impact of Seawater Intrusion on Groundwater Using Geoindicators in Padang City Vito Charly (a,b), Heru Hendrayana (a), and Costandji Nait (b) a) Departement of Geological Engineering Gadjah Mada University, Yogyakarta, Indonesia b) Ministry of Public Works and Housing of Indonesia, South Jakarta, Indonesia Abstract Padang City is the capital of West Sumatra Province. The geographical condition of Padang City is directly adjacent to the sea. One of the direct negative impacts is the potential for seawater intrusion. Seawater intrusion is a groundwater problem in coastal areas. Based on this, this research was carried out to map groundwater vulnerability zones to seawater intrusion. The method used to determine the zoning of seawater influence distribution is analyzed based on Electrical Conductivity (EC) values and geoindicators. Analysis of EC values from 54 groundwater samples revealed that 2 samples were classified as moderately saline, and 1 sample was classified as slightly saline. From the groundwater ion values, two of the three samples showed chloride values >400 mg/L. The comparison of the Cl/HCO3- ratio shows that the 2 samples each have a medium and high influence on seawater. The results of the analysis using Geoindicators with 6 parameters-Increased Ca concentration, Cl/Br Ratio, Na/Cl Ratio, Ca Enrichment, Simpson Ratio, and BEX-indicate the level of vulnerability to seawater. It shows that 2 samples, SG-13 and SG-15, are moderately influenced- 9 samples are low influenced, and the remaining 16 samples are uninfluenced. Keywords: geoindicators, electrical conductivity, groundwater Share Link | Plain Format | Corresponding Author (Vito Charly)

65	Hydrology, hydrogeology, and geology engineering	ABS-100
Preliminary Hydrogeology of the East Banyuwangi Coastal Plain Area, East Java Province Putritansy Neysa (1,2), Heru Hendrayana (1), and Pulung Arya Pranantya (2) (1) Departement of Geological Engineering, Gadjah Mada University, Yogyakarta, Indonesia (2) Ministry of Public Works and Housing of Indonesia, South Jakarta, Indonesia Abstract Abstract: Banyuwangi Regency is located at East Java Province. The rapid development of tourism in the coastal areas of East Java is in line with the increasing population and increasing water needs. This research aims to address the sustainability of water resources. Therefore, hydrogeological concepts are needed to assess and estimate the potential of water resources to maintain water quality and quantity. The methodology used in this research includes geological mapping, hydrometeorological analysis, rock resistivity measurements and water quality testing. The research uses rivers as hydrological boundaries. Tekik River as north area hydrological boundaries and Sobo River as south area hydrological boundaries. The lithology of the research area is alluvium on coastal area and conglomerate rock and breccia on the west side of research area. The aquifer system in the research area has an intergranular space aquifer with a continuous level in the coastal area and a fissure and intergranular aquifer system with a low to medium continuous level in the west area. The hydrological conditions of the research area consist of parameters such as rainfall values of 1496 mm/year, evapotranspiration values of 1210 mm/year, runoff values of 212 mm/year, and groundwater recharge or infiltration of 74 mm/year. Keywords: hydrogeological conceptual model, geology mapping, resistivity, Banyuwangi coastal area Share Link | Plain Format | Corresponding Author (Putritansy Neysa)

66	Hydrology, hydrogeology, and geology engineering	ABS-101
Spring Occurrences in Dieng Plateau Jessica Rotua Valentina Lubis, Doni Prakasa Eka Putra, Fikri Abdurrachman Jessica Rotua Valentina Lubis (a*,c), Doni Prakasa Eka Putra (b), Fikri Abdurrachman (c) a) Student Master of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta Jl. Grafika Bulaksumur No. 2 Senolowo, Sinduadi, Kec. Mlati, Kabupaten Sleman, Daerah Istimewa Yogyakarta 55284. *Email: jessicarotuavalentinalubis[at]mail.ugm.ac.id b) Departement of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta Jl. Grafika Bulaksumur No. 2 Senolowo, Sinduadi, Kec. Mlati, Kabupaten Sleman, Daerah Istimewa Yogyakarta 55284 c) Ministry of Public Works of Housing, Directorate General of Water Resources Jalan Pattimura No. 20 Kebayoran Baru Jakarta Selatan 12110 Abstract Springs are one type of water resource that is important to fulfil clean water and irrigation needs. The availability of springs can support the lives and activities of the people who live above them. The Dieng Plateau in Central Java province has natural phenomena and beautiful view, as well as having various historical attractions, this makes Dieng has potential in the tourism sector. By increasing the tourism in Dieng, the need for water to support life must be concern in quality and quantity. Currently there are many springs, lakes and craters in the Dieng area. This allows sulfur contamination occur from the crater to the springs which local residents use every day. Therefore, it is important to carry out an inventory of springs in order to know the community^s need for clean water in the future, both in quantity and quality. Researcher collected primary and secondary data by geology and hydrogeology mapping, measurements of the physical-chemical properties of ground water, and spring discharge. Methods for testing physical-chemical properties and measuring discharge are measured directly in the field using Water Quality Tester 4in1 Model Number TDS-6B. Based on the mapping results, there are 16 (sixteen) springs located in 2 Ground Water Basins (CAT). Based on the measured discharge value (l/s), the maximum discharge value is 133.2 l/s and the minimum discharge is 0.4 l/s. Based on the measured pH value, the average value for CAT Wonosobo and 7.69 for CAT Karangkobar. Based on the measured TDS (mg/L) value, the average value for Wonosobo CAT is 126.75 mg/L and 233 mg/L for Karangkobar CAT. Based on the measured DHL value (&#956-s/cm), the average value for CAT Wonosobo is 252.5 &#956-s/cm and 465 &#956-s/cm for CAT Karangkobar. Based on the T value (degC) measurable, the average score on the Wonosobo CAT is 17 degC. and 18.57 degC is for CAT Karangkobar. From the measurement results, it was concluded that the existing spring discharge was not sufficient for the daily water needs of the community. Based on the results of physical-chemical measurements, the pH, DHL and TDS values in spring water in the Dieng Plateau are in good quality in water drink standards based on applicable references and regulations. Keywords: Water springs, Physical-Chemical Properties Test, Discharge of Springs Share Link | Plain Format | Corresponding Author (Jessica Rotua Valentina Lubis)

67	Hydrology, hydrogeology, and geology engineering	ABS-102
Identification Of Iron (Fe) and Manganese (Mn) in Shallow Groundwater Potential Using Geographic Information System (Kramat Jati District, East Jakarta) Sheilla Megagupita Putri Marendra (a*), Ramadhani Yanidar (a), Sarah Aphirta (a), Astari Minarti (a), Putri Salsabila (a) (a) Department of Environmental Engineering, Faculty of Landscape Architecture and Environmental Technology, Universitas Trisakti Abstract Well water is a source of water for household. However, shallow groundwater with a depth of less than 15 m carries a high risk of contamination. Kramat Jati is one of urban areas in the city of Jakarta where sources of groundwater pollution can come from livestock areas and bad sanitation. from physical indicators of water pollution, shallow groundwater in Kramat Jati District has characteristics that indicate pollution due to the solubility of iron (Fe) and manganese (Mn). This research aims to map the distribution of iron (Fe) and manganese (Mn) pollution in shallow groundwater in Kramat Jati District. Sampling was taken using the Stratified Random Sampling (SRS) method at a radius 250 m, 500 m and 750 m from the livestock area. The total sample is 20 sampling points. Questionnaires are used to obtain clean water sanitation characteristics. The method used to map the distribution of pollution is the interpolation method with ArcGIS and Surfer software. The results from this analysis were used to create a map that delineates the actual spatial distribution of Fe and Mn in Kramat Jati District. The highest pollution concentration for iron parameters was 3.24 mg/l, and manganese 7.91 mg/l. Interpolation results show that the increase in groundwater concentration is dominant into northern and southern areas of the subdistrict. The main factors that cause pollution come from the distance between septic tank and well being less than <10 meters, and alluvial soil type in this area study. This shows that the groundwater in this area is not suitable as a source of drinking water and sanitation hygiene according to Minister of Health Regulation No. 2 of 2023. Therefore, it is necessary to carry out simple processing using filtration and it is necessary to provide a clean water piping system in this area. Keywords: Kriging Method, Distribution Pattern Mapping, Groundwater Pollution, Iron (Fe) and Manganese (Mn), Kramat Jati District Share Link | Plain Format | Corresponding Author (Sheilla Megagupita Putri Marendra)

68	Hydrology, hydrogeology, and geology engineering	ABS-104
Probabilistic Analysis of The Stability of Open Pit Mine Slopes Using The Two Dimensional Limit Equilibrium Method In PT. Makmur Lestari Primatama, Langgikima District, North Konawe Regency, Southeast Sulawesi Masagus Ahmad Azizi, Yuga Maulana, dan Kristian Bentus Karya Trisakti University Abstract The Open Pit mine method is often faced with the problem of determining a safe slope geometry for mining activities. Therefore, it is necessary to carry out a slope stability analysis by comparing the results of the analysis of the Factor of Safety (FK) and the Probability of Slide (PK) using the 2D method through the Slide6 software. In this study will use the Limit Equilibrium Method. On the existing single excavation slope with slope geometry: height 5 m, width of berm 5 m, and slope angle of 26 obtained FK more than 1.2 and PK are 0 in saturated condition. So that for a single embankment slope this can be optimized with the geometry ofthe slope: a height of 5 m, a width of 5 m of berm, and a slope angle of 45, the values of FK are 1,301 and PK are 1.4. The existing excavation slopes have been stable with an FK value of 1,261. And the results ofthe optimized embankment slope geometry have been stable with an FK value of 1,301 pit areas which are within the IUP area of PT. MLP has the potential for landslides due to the actual conditions not matching the existing designs. Keywords: Slope Geometry, Factor of Safety, Limit Equilibrium Method, 2D analysis Share Link | Plain Format | Corresponding Author (Kristian Bentus)

69	Hydrology, hydrogeology, and geology engineering	ABS-108
Seawater Intrusion Assessment in Palu Bay, Central Sulawesi of Indonesia Catur Nilawardani (a*), Wahyu Wilopo (b), Wursito Adi Baskoro (c) a) Student Master of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta 55281, Indonesia *caturnilawardani[at]mail.ugm.ac.id b) Department of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta 55281, Indonesia c) Ministry of Public Works and Housing, Jakarta 12110, Indonesia Abstract Palu Bay is a body of water covering the mainland of Palu City and Donggala Regency. The phenomenon has made groundwater the primary source of clean water supply in the city by contributing 65.63% of total drinking water which is estimated at 2.7 million m3. The community also uses shallow or deep wells equipped with pumping systems to fulfill daily needs but some have reported a brackish taste in water. Therefore, this research aimed to assess the possibility of seawater intrusion in the area. This was achieved by analyzing the values of Electrical Conductivity (EC), Total Dissolved Solids (TDS), chloride ion concentration (Cl-), plotting Cl/Br (bromide) vs Cl, Simpson ratio, sodium chloride ratio, and Base Exchange Index (BEX). The results showed that several areas around Palu Bay, including Mantikulore and West Palu Districts experienced seawater intrusion. Keywords: Saltwater intrusion- groundwater- geochemistry Share Link | Plain Format | Corresponding Author (Catur Nila Wardani)

70	Hydrology, hydrogeology, and geology engineering	ABS-110
Groundwater quality assessment for domestic purposes in Likupang National Tourism Strategic Area (KSPN), Indonesia Agitya P. Tansil, Wahyu Wilopo, Fikri Abdurrachman Department of Geological Engineering, Gadjah Mada University, Yogyakarta, Indonesia Directorate General of Water Resources, Ministry of Public Works and Housing, Jakarta, Indonesia Abstract East Likupang as one of the regions in the development of the national tourism area in Indonesia must fulfill adequate tourism aspects, especially in clean water needs, both for tourism needs and for domestic purposes (hygiene and sanitation) for residents in the tourism area. The research was carried out by collecting 20 samples at 2 spring points and 18 groundwater wells spread throughout East Likupang District. Groundwater samples were evaluated based on the Indonesia Minister of Health Regulation No. 2 of 2023 on Implementing Regulations of Government Regulation No. 66 of 2014 on Environmental Health and analyzed with the main physicochemical parameters, such as e-Coli, total coliform, TDS, turbidity, pH, nitrite (NO2), chromium (Cr6+), iron (Fe) and manganese (Mn). Laboratory test results show that the majority of water samples at all spring and groundwater well sampling locations are not suitable to be used as a source of clean water. This can be seen from the results of microbiological parameter tests which do not meet existing standards. However, if we only refer to physical and chemical parameters, most of these groundwater sources are still suitable for use as water sources for domestic needs. These results indicate that villages, which are the main locations for tourism development, still have water access and water quality that is inadequate to support domestic water needs, both for tourism purposes. Keywords: East Likupang, groundwater quality assessment, water contamination, physicochemical parameters, physical parameters, chemical parameters Share Link | Plain Format | Corresponding Author (Agitya P. Tansil)

71	Hydrology, hydrogeology, and geology engineering	ABS-120
Determination of Groundwater Recharge Area based on Isotope data in Makassar Coastal Area, South Sulawesi, Indonesia Sunu Ardhi Nugroho (a,c), Wahyu Wilopo (b), Ahmad Taufiq (c) (a) Student Master of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta, 55281 (b) Department of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta, 55281 (c) Ministry of Public Works and Housing, Jakarta, 12110 Abstract The government recently improved the Makassar metropolitan area in South Sulawesi, Indonesia, to support the main food supplier for Indonesia^s new capital city of Nusantara (IKN) in East Kalimantan. These improvements will impact the increase in population and the need for fresh water. The people in this metropolitan area, especially Makassar, the main and core city, still use groundwater daily. Groundwater availability is closely related to water infiltration and the amount taken. Therefore, finding a groundwater recharge area in the Makassar Coastal area is necessary to manage groundwater resources for sustainability. This research aims to determine the groundwater recharge area of the Makassar coastal area using isotope methods. Nineteen isotope water samples, including rainwater, groundwater, river, and seawater samples, were taken to the laboratory. The analysis of the comparison diagram between the &#948-18O and &#948-D isotope water samples shows that the groundwater in the Makassar coastal area has the same genesis and still comes from rainwater. In contrast, some of the groundwater samples are affected by seawater or experienced seawater intrusion. The groundwater recharge area is located at an altitude between 4.88 to 49.92 masl. Based on the type of aquifer, the groundwater recharge area in the unconfined aquifer is located between 4.88 and 49.92 masl. In comparison, the semi-unconfined aquifer is located at an altitude between 20.75 to 37.92 masl. Keywords: groundwater, recharge area, isotope, coastal area Share Link | Plain Format | Corresponding Author (Sunu Ardhi Nugroho)

72	Hydrology, hydrogeology, and geology engineering	ABS-122
Cold Spring Occurrences in Dieng Plateau Jessica Rotua Valentina Lubis1,3, Doni Prakasa Eka Putra2, and Fikri Abdurrachman3 1. Master Student of Geological Engineering Gadjah Mada University, Yogyakarta, Indonesia 2. Department of Geological Engineering, Gadjah Mada University, Yogyakarta, Indonesia 3. Ministry of Public Works and Housing of Indonesia, South Jakarta, Indonesia Abstract Traditionally, spring water is one type of water resource that is important for meeting clean water and irrigation needs. The Dieng Plateau in Central Java province is a national tourism strategic area (KSPN). Being located in 2 groundwater basins, namely CAT Wonosobo and Karangkobar, the Dieng Plateau has problems in fulfilling the clean water needs. With the rise of tourism in Dieng, clean water needs must be covered in terms of quality and quantity. Many cold springs in the Dieng area have not been maximally utilized. Therefore, it is important to conduct a spring inventory to supply the community^s need for clean water in the future, both in quantity and quality. This study collected data on springs^ presence and measurements of groundwater^s physic-chemical properties and spring discharge. From the mapping results, 16 (sixteen) springs occurred in the study area. Based on the measured discharge value (l/s), the total spring discharge was 251 l/s, with a maximum discharge value of 133.2 l/s in the CAT Karangkobar area. The Dieng Plateau springs have complied with the drinking water standards based on applicable references and regulations regarding physic-chemical parameters. This is proven by the average pH value of 7.07, the average TDS of 206.1 mg/L, the average EC of 412.1 &#956-S/cm, and the average temperature of 18.2 degC. The springs in the Dieng area are classified as cold/normal springs based on their groundwater temperature and have potential as a raw water source. Keywords: Cold Springs, Dieng Plateau Share Link | Plain Format | Corresponding Author (Jessica Lubis)

73	Mineral and Energy Regulation and Economics	ABS-18
Real Option Analysis Of A coal mining Project Rizki Amalia (a*), Rini Novrianti Sutardjo Tui (a), Aryanti Virtanti Anas (a), Andhika Baharuddin (a), Febri Saputra T. (a), Tasyah Shafira(a) a) Mining Engineering Department, Faculty of Engineering, Hasanuddin University Jalan Poros Malino Km.6 Bontomarannu, Gowa, Sulawesi Selatan 92171, Indonesia *rizkiamalia[at]unhas.ac.id Abstract In 2021, PT ABC plans to open a new pit, namely Pit XYZ. Currently, PT ABC uses the Discounted Cash Flow method to determine the economic feasibility of Pit XYZ. However, this method does not accommodate changes in coal commodity prices, which continue to fluctuate over time. The aim of this research is to conducting real option (RO) analysis to obtain the option value with the option to abandon in pit XYZ project of PT ABC. The analysis was conducted using NPV parameters as the basic asset, with a value of US 105,126,304.47, coal price volatility of 30.60%, a risk-free rate of 3.42%, and a mine life of 5 years. The results of the ROV show an Expanded NPV of US 105,126,313.05, which exceeds the value of the DCF analysis results. It is recommended that PT ABC continue developing the project as planned. Conversely, if the economic situation worsens and the project^s value falls to US -6,031,721.79, it would be optimal for the company to halt the opening of pit XYZ. Keywords: Coal- Price Volatility- Discounted Cash Flow- Real Option Valuation Share Link | Plain Format | Corresponding Author (Rizki Amalia)

74	Mineral and Energy Regulation and Economics	ABS-20
^Geological Characteristics, Hydrothermal Alteration, and Mineralization of Porphyry Deposits in Sidomulyo Area, Trenggalek Regency, East Java^ Oan Marcello Lukas Watania(a) , Raden Aditya Manggala Yudha(a), Danis Agoes Wiloso(a) (a) Indonesia AKPRIND University, Jl. Kalisahak No. 28 Kota Yogyakarta 55222 E-mail: marcellowatania[at]gmail.com, adityamanggala.geo[at]gmail.com Abstract East Java, as a part of the Eastern Sunda Magmatic Arc on Java Island, is a location that has the potential for metal endowment. In fact, it has been proven that mineralization in East Java has economical ore deposits that consist of porphyry and epithermal systems from Selogiri, Pacitan, Trenggalek and extending to Tumpangpitu. This paper is aimed at investigating and discussing the characteristics of geology, hydrothermal alteration, and mineralogy as well as their relationship with parageneses at Sidomulyo area, Trenggalek regency, East Java. The research methodology includes field data recording, rock sampling and several analyses i.e petrography, ore microscopy, and clay analysis (X-Ray Diffraction). The lithological units comprise andesitic tuff, tonalite, coarse diorite, and fine-grained diorite.The hydrothermal alteration classified into 8 zones based on mineral assemblages: (1) actinolite - orthoclase - magnetite, (2) secondary biotite - k-feldspar, (3) epidote - chlorite - actinolite, (4) sericite - shreddy chlorite - muscovite - illite, (5) sericite - illite - quartz - pyrite, (6) phyrophyllite - diaspore - quartz - alunite, (7) kaolinite - illite - quartz, and (8) chlorite - epidote. Mineralization style is deposited into disseminated sulfides and stockwork veins associated with pyrite, magnetite, chalcopyrite, bornite, covellite, and chalcocite. The characteristic of hydrothermal alteration implicates prograde and retrograde by multiple intrusion stages. The prograde alteration produces sodic calcic and potassic alteration that characterized by presence of rich actinolite and secondary biotite associated with epidote, K-feldspar, and albite at intrusion bodies. The post structural cuts the previous hydrothermal alteration inflict decreasing temperature formed sericite and clay alteration as retrograde alteration around intrusion bodies. Mineralization styles are deposition on dissemination in rocks and vein stockwork at magnetite and quartz veins deposi Keywords: Dioritic Complex, Copper Mineralization, Eastern Sunda Magmatic Arc Share Link | Plain Format | Corresponding Author (Oan Marcello Lukas Watania)

75	Mineral and Energy Regulation and Economics	ABS-29
Analysis of Indonesia^s Primary Energy Mix Using Analytical Hierarchy Process (AHP) and Linear Programming (LP) Methods Tomi Nugroho1,a), Fadhil Mahdyrianto1,b), and Mixsindo Korra Herdyanti1,2,c) 1Department of Mining Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganesa No.10, Lb. Siliwangi, Kecamatan Coblong, Kota Bandung, Jawa Barat 40132 , Indonesia 2 Mining Engineering Department, Faculty of Earth Technology and Energy, Universitas Trisakti, Jalan Kyai Tapa No. 1, Tomang, Grogol Petamburan, West Jakarta 11440, Indonesia a) Corresponding author: tominugroho2281[at]gmail.com b) fadhilrianto[at]gmail.com c) mixsindokorra[at]trisakti.ac.id Abstract Global challenges in the energy sector are prompting countries to formulate more holistic and sustainable policies. In Indonesia, energy needs are supported by four main sources: coal, oil, gas, and new renewable energy (NRE). To determine the optimal energy mix, a Multi-Criteria Decision Making (MCDM) approach, such as the Analytical Hierarchy Process (AHP), is applied to primary energy policies. AHP serves as a guide in establishing energy mix proportions through the application of Linear Programming (LP). The primary goal of this study is to establish the best combination of energy mix for coal, oil, gas, and New Renewable Energy (NRE) in Indonesia. This research uses a quantitative approach with AHP and LP methods. Primary data were collected through questionnaires evaluated in the AHP, while secondary data were also used in the AHP evaluation and Benefit Cost Ratio (BCR) calculations. The study involved 23 experienced respondents from various energy sectors and used secondary data as criteria for AHP evaluation, supporting technical calculations to find the most optimal energy combination. The application of linear programming with the simplex method was used to determine the percentage of energy mix, where the objective function is to maximize the economics of each energy source by incorporating the results of AHP preferences. The results of the study show that the composition of the primary energy mix for coal is 35%, oil 15%, gas 20%, and New and Renewable Energy (NRE) 30%. Keywords: Primary Energy Mix, Analytical Hierarchy Process, Benefit Cost Ratio, Linear Programming Share Link | Plain Format | Corresponding Author (Tomi Nugroho)

76	Mineral and Energy Regulation and Economics	ABS-79
Autoregressive Integrated Moving Average Model for the Forecasting of Gold Prices Edios Merah (a*), Rini Novrianti Sutardjo Tui (a), Aryanti Virtanti Anas (a) (a) Mining Engineering Department, Faculty of Engineering, Hasanuddin University. Jalan Poros Malino Km.6 Bontomarannu, Gowa, Sulawesi Selatan 92171, Indonesia. Abstract Gold prices are subject to significant fluctuations influenced by various economic, geopolitical, and market dynamics. Understanding these fluctuations is crucial for investors to make informed decisions. This research employs the Autoregressive Integrated Moving Average (ARIMA) model to forecast gold prices, considering its ability to analyze time series data effectively. The study utilizes historical gold price data from January 2008 to December 2022), to construct and validate the ARIMA model. The research methodology involves several stages, including data preprocessing, identification of ARIMA parameters, parameter estimation, diagnostic testing, and forecasting. Stationarity testing using the Augmented Dickey-Fuller (ADF) test reveals the non-stationarity of the data initially, which is addressed through differencing. Correlogram analysis aids in identifying appropriate ARIMA parameters, and diagnostic tests ensure the adequacy of the chosen model. After comparing and evaluating multiple ARIMA models, the ARIMA (22,1,25) model is selected as the most suitable for forecasting gold prices. This decision is based on criteria such as the Akaike Information Criterion (AIC), Hannan-Quinn Criterion, and R-squared values. The chosen model undergoes white noise testing to validate its suitability for forecasting.Using the validated ARIMA(22,1,25) model, gold price predictions are made for the period from January 2023 to December 2027. The predicted prices provide valuable insights for stakeholders, assisting in investment decisions, financial planning, and risk management strategies. Overall, this study demonstrates the efficacy of the ARIMA model in forecasting gold prices and underscores its importance in navigating the complexities of the gold market. By leveraging advanced statistical techniques and historical data analysis, stakeholders can gain a better understanding of future price trends and make more informed decisions in the gold market. Keywords: Autoregressive Integrated Moving Average Model- Forecasting of Gold Prices- Identification of ARIMA Parameters. Share Link | Plain Format | Corresponding Author (Edios Merah)

77	Mineral and Energy Regulation and Economics	ABS-87
An Investigation of Mining Management Based on Green Mining Integrated with the Potential and Exploration of Mineral Resource Using the AHP Method in Jember East Java Januar Fery, I. , Haeruddin , Fanteri Aji, D. , Mifthakhul Ulum Mining Engineering Study Program, Engineering Faculty, University of Jember Indonesia Abstract Policies regarding mineral and coal exploitation are implemented in designated mining areas, and are carried out by applying good mining principles by paying attention to and considering national and global climate changes which are significant in the management and utilization of the mining sector. Policies for the management and use of rocks as mining potential require measurement in evaluating and monitoring dune mining activities. In Jember Regency, the rock mined from hummocks and limestone hills is used as a source of building construction materials and to support vital industries. Therefore, an investigative study of its management and utilization is needed so that the existence of hummocks can be managed effectively and efficiently. This investigative study was carried out by observing the environmental conditions of the hummocks and the ongoing and post-mining rock mining patterns. Measurement of rock management and utilization was carried out using the AHP (Analytical Hierarchy Process) method based on 5 Mineral and Coal Policy criteria. The research results show that the management and utilization of rocks in Jember Regency was categorized into moderate criteria, meaning that improvements need to be made so that mining can be carried out in accordance with the national mineral and coal policy based on green mining. Keywords: AHP, policy, mining, criteria, environmental Share Link | Plain Format | Corresponding Author (Januar Fery Irawan)

78	Mineral and Energy Regulation and Economics	ABS-118
Production Sharing Contracts in Oil and Gas Industry: A literature review Krisdianto Wahyu, Baihaqi Imam, Gunarta I, Wibawa I Interdisciplinary School Of Management And Technology, Sepuluh Nopember Institute of Technology, Surabaya, Indonesia Abstract Exploration and exploitation of oil and gas resources requires high investments and involves high uncertainties. Many countries use production sharing contracts (PSC) mechanism to explore their potential resources into commercial values. There are various types of production sharing contracts that are operated in various countries. Using literature review, this paper identifies various type of the production sharing contracts in the world and investigates the advantages, disadvantages including the risks associated with each type of PSCs. The review results provide source of information about each type of PSCs that benefits governments, investors, and stakeholders. Keywords: Production Sharing Contract Agreement, Cost Recovery, Gross Split, Oil and Gas, Investment. Share Link | Plain Format | Corresponding Author (Wahyu Krisdianto)

79	Mineralogy, petrology, and volcanology	ABS-6
Petrogenesis Of Sadakeling - Karaha Volcanic Complex, Tasikmalaya, West Java, Indonesia: Argoland Contamination Azrie Ezziat Putera Muhammad (a*), Mirzam Abdurrachman (a), Mochammad Nugraha Kartadinata (b), Wilfridus FS Banggur (c) a) Program Studi Teknik Geologi, Fakultas Ilmu dan Teknologi Kebumian, Institut Teknologi Bandung (ITB), Jl. Ganesha No.10, Bandung, Jawa Barat, Indonesia. *azriezziat20[at]gmail.com b) Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG), Jalan Diponegoro 57, bandung 40122, Indonesia. c) Pusat Penelitian Bencana Geologi, Jalan Sangkuriang, Bandung 40135, Indonesia Abstract The Sadakeling - Karaha Volcano Complex is part of a Tertiary Magmatic Arc in West Java enclosed with several active volcanoes. Based on the tectonics, this area can be a continuous fragment of the Australian Continent Argoland, which controls the magmatism process. This study aims to determine the magma series, tectonic setting, and the continuity of Argoland contamination using petrogenesis study. The type of data for this study uses nine primary data from geochemical content (major, minor, and trace elements) using XRF analysis. The geochemical studies reveal that the Sadakeling Karaha Volcanic Complex points to the insignificant content in total alkali (3,59 - 4,85 wt.%), yet with positive correlations with increasing SiO2 content (52,48 - 61,8 wt.%). The value range can be categorized into basaltic-andesite with sub-alkaline magma series characteristics, and magma alkalinity was identified as a medium-K series group. Other than that, there is a slight enrichment in FeO compounds, but the trend shifts towards alkaline, representing the tholeiitic magma series. Based on a triangular and bivariate diagram from trace and minor elements, Sadakeling-Karaha Volcanic Complex is categorized as Volcanic Arc Basalt. Due to the strong influence of continental crust from major elements and the bivariate diagram between Zr and Zr/Y, supported by the spider-diagram pattern, this area belongs to the active continental margin. The detailed explanation about the magma source allegedly originates from the contamination between the Sundaland crust in the north and Gondwana in the south. The part of Gondwana or Argoland presence influences is strengthened with an identical Trace element content (Sr and Nd) with the SE Australian Granite. Keywords: Petrogenesis- Sadakeling Karaha Volcanic Complex- magma series- tectonic setting- Argoland Share Link | Plain Format | Corresponding Author (Azrie Ezziat Putera Muhammad)

80	Mineralogy, petrology, and volcanology	ABS-34
New Unified Classification for Fine Grained Sedimentary Material Based on Atterberg Limits Hakim Erlangga Bernado Sakti (a*), Sari Bahagiarti Kusumayudha (a), M. Nurcholis (b), Joko Soesilo (a), Andang Bachtiar (c) a) Geological Engineering Department, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Sleman, Indonesia *hakimerlangga[at]gmail.com b) Soil Science Department, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Sleman, Indonesia c) PT. Geosains Delta Andalan, Jakarta, Indonesia Abstract Fine grained sedimentary material, which comprises mud and mudrock is the most abundant sedimentary material. The term mud is used to describe grain sizes, including silt and clay. It is also used to refer to loose sedimentary material and soil. Mudrock is further divided into mudstone and shale based on structure, and into siltrock and clayrock based on grain size. However, the nomenclature of these materials is frequently inconsistent, and there is no unified classification system for these materials. This is due to the difficulty and expense of particle size analysis (PSA), particularly in silt and clay fractions. AIPEA and CMS have proposed using plasticity parameters, i.e., plasticity index (PI) and liquid limits (LL), to differentiate between silt and clay, with clay defined as a fine-grained material with PI greater than or equal to LL/2. In engineering geology, a quantitative limitation on mud and mudrock is necessary. This is defined as the uniaxial compressive strength (UCS) value, which is mudrock with a UCS > 1.2 MPa. Mudstone and shale can be distinguished based on the ease with which a fissility plane structure can be formed with a maximum thickness of 1 cm. The term shale is defined as a sedimentary rock that is easily fissile, whereas mudstone is defined as a rock that is not fissile (massive). This article presents a new unified classification for fine-grained sedimentary materials, including loose sediments, soils, and sedimentary rocks. This new unified classification is expected to facilitate the naming of fine-grained sedimentary materials and the determination of clay and silt fractions based on their plasticity, as an alternative to using PSA. Keywords: Plasticity, Silt, Clay, Mud, Mudrock Share Link | Plain Format | Corresponding Author (Hakim Erlangga Bernado Sakti)

81	Mineralogy, petrology, and volcanology	ABS-60
Identification of Alteration Zones Based On Satellite Images and Vegetation Response for Geothermal Exploration in Volcanic Fields Wina Eka Rahmidiani (1,a), Asep Saepuloh (1,b), Estu Kriswati (2), Ridwan Rahmanto (1) 1) Geological Engineering, Faculty of Earth Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *saepuloh[at]itb.ac.id 2) Research Center for Geological Disaster, National Research and Innovation Agency (BRIN) Jalan Sangkuriang, Bandung 40135, Indonesia Abstract In accordance with Government Regulation No. 79 of 2014 concerning National Energy Policy, the utilization of geothermal energy is targeted up to 23% or about 7,242 MW in 2025. There are at least 62 geothermal fields with potential for exploitation on the Java Island. To fulfil this governmental target, a comprehensive preliminary survey with effective and efficient methods is necessary. Thus, remote sensing can serve as an alternative solution to support preliminary surveys. The emergence of geothermal manifestations, whether in the form of fluid or gas, can induce vegetation to be stressed or death. Direct evidence of geothermal manifestation presented by surface features such as hot springs, steam vents, and fumaroles could be detected by remote sensing methods. The appropriate remote sensing methods can support the early exploration stages to assess wide coverage area rapidly. Therefore, this study is aimed to characterize geothermal features based on a combination of remote sensing methods and field measurements at Mts. Ijen (East Java), Tangkuban Parahu (West Java), and Kamojang-Guntur (West Java). Data used in this study were Sentinel-1A and 2B images, DEMNAS, and chlorophyll content of ferns. The selected remote sensing methods are the modified Segment Tracing Algorithm (mSTA), band ratio, and red edge vegetation index (REVI). The mSTA was used to estimate fractures permeability which serve as hydrothermal fluid paths to the surface and change rock minerals into soil affecting plant physiological conditions. The band ratio and REVI methods were used to identify the alteration zone and vegetation stress, respectively. The stressed vegetation due to soil contamination of hydrothermal fluid can serve as an indirect indicator of geothermal system. The obtained results reveal that lineament density at selected study areas concordance to the chlorophyll content and ground temperatures. Based on Sentinel-2B image, the alteration zones were identified by R,G,B color composite for bands 4/2, 6/7, 5 as orange-hues and bands 4/2, 6/7, 10 as pink-hues. Following image enhancement process, colour indicating alteration became more prominent than original composite. Based on the REVI, alteration zones were identified by index less than 0,25. The measured chlorophyll contents of the ferns confirmed that the vegetation above alteration zones were under stressed condition presented by chlorophyll content less than 25 SPAD. Keywords: Remote sensing- Sentinel-1A- DEMNAS- Sentinel-2B- Geothermal manifestation- Vegetation stress- Ijen- Tangkuban Parahu- Kamojang Share Link | Plain Format | Corresponding Author (Wina Eka Rahmidiani)

82	Mineralogy, petrology, and volcanology	ABS-63
Geochemical Characterization Of Bedrock And Distribution Of Enrichment Of Rare Earth Elements And Scandium In Nickel Laterite Within The Wulu Area, Central Buton District, Southeast Sulawesi Province Faried Ardian P (a*), Adi Tonggiroh (b), Ulva Ria Irfan (b) a*) Master Student Geological Engineering, Faculty of Engineering, Hasanuddin University b) Department of Geological Engineering, Hasanuddin University, Makassar, Indonesia Abstract The Wulu area has an abundance of nickel laterite mineral resources, and based on fluctuations in the chemical values of saprolite limonite zoning, it is evident that further research is needed, especially regarding the presence of REE (Rare Earth Elements) in limonite. This research aims to examine the chemical changes of ultramafic rocks from fresh conditions to the process of enriching laterite elements and their relationship to REE, particularly scandium. To achieve the research objectives, ED-XRF and ICP-MS methods were employed on several samples representing ultramafic and laterite zonation. The research results indicate that the ultramafic source of the wehrlite type has the potential to increase REE production to 0.91 ppm, compared to lherzolite at 0.27 ppm and harzburgite at 0.20 ppm. The high REE production from wehrlite is further supported by laterization in the limonite zone, resulting in a concentration increase to 42 ppm, which is higher than that of harzburgite and lherzolite, namely 18 ppm. The difference in REE production from the ultramafic types is attributed to an imbalance in laterization, causing the distribution of REE enrichment to be inversely proportional to the ultramafic type. High REE levels will influence the REE concentration resulting from laterization. Keywords: Geochemistry, REE, Scandium, Ultramafic, Nickel laterite, Kabaena, Sulawesi, Indonesia Share Link | Plain Format | Corresponding Author (Faried Ardian Putranto)

83	Mineralogy, petrology, and volcanology	ABS-81
Delineating Gravity Anomaly Sources Using Derivative Analysis for Gold Exploration in the Kluet Formation Frederic Steven (1), Syafrizal (2), Arie Naftali Hawu Hede (2), Petryan Paulus Pangihutan (2), Raden Ferianggoro Supriadi (3) (1) Master Program of Mining Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Indonesia 40132 (2) Earth Resources Exploration Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Indonesia 40132 (3) Undergraduate Program of Geophysics, Faculty of Exact Sciences and Natural Sciences, Universitas Indonesia, Indonesia 16424 Abstract This study investigates the efficacy of integrating gravity derivative analysis with existing geological data for targeting gold exploration within the Kluet Formation, Aceh - North Sumatra. The Kluet Formation, known for its complex geological history and potential for hosting gold mineralization, is characterized by a series of faults, fractures, intrusive bodies, and various lithologies. Complete Bouguer Anomaly (CBA) data are analyzed using First Vertical Derivative (FVD), Second Vertical Derivative (SVD), and Total Horizontal Derivative (THD) filters to enhance subsurface structural features commonly associated with gold deposition. FVD and SVD maps effectively highlight the locations of gravity anomaly sources, while THD maps delineate their boundaries. These derivative maps are then integrated with existing geological maps, including fault traces, fracture systems, and the distribution of intrusive bodies and lithologies, to delineate areas where these features spatially correlate with gravity anomalies. This integrated analysis was applied to the Kuta Usang artisanal gold mining area within the Dairi Regency. Several prominent gravity anomalies were identified and their spatial correlation with known faults, fracture zones, and altered rock units was established. To validate the results, samples were collected from locations proximal to these identified gravity anomalies. Analysis of these samples revealed altered rocks associated with fractures, containing gold concentrations up to 4.29 ppm and silver concentrations up to 27 ppm, as determined by Atomic Absorption Spectrometry. This study demonstrates that integrating gravity derivative analysis with detailed geological mapping significantly improves the efficiency of targeting and prioritizing gold exploration efforts within structurally complex terrains like the Kluet Formation. Keywords: Complete Bouguer Anomaly, Gold Mineralization, Kluet Formation, Kuta Usang Share Link | Plain Format | Corresponding Author (frederic steven)

84	Mining Engineering and metallurgy	ABS-11
Study of gold extraction based on ore characteristics using hydrometallurgy method in PT XYZ Fahny Ardian (a*), Infantri Putra (a), Attar Zidan Mahendra (a), Rakha Ammarsetya Nugeraha (b) a) Politeknik Energi dan Pertambangan Bandung Jalan Jenderal Sudirman 623, Bandung 40211, Indonesia *Fahny.Ardian[at]esdm.go.id b) PT Geoservices Cikarang, Indonesia Abstract Gold extraction is a vital process in the mining industry, as gold is a valuable and highly sought-after metal. A detailed mineralogical and characteristics study of refractory gold ores from PT XYZ was conducted. The primary components of refractory ores were silicates, carbonates, oxides, carbon, and sulfides. Because refractory ore contains contaminants that impact gold recovery, pre-treatment is necessary before processing to maximize gold recovery. To maximize the percentage of gold recovery, the refractory ore type in this study will be subjected to a pre-treatment technique called roasting, which attempts to reduce the sulfur content and alter the porosity of the ore. The hydrometallurgical method of extracting gold used in this research is cyanide- this technique was selected since it is the most technologically efficient way in the mining sector to date. Five ores were employed in this study: A, B, C, D, and E were obtained from PT XYZ in Indonesia. Based on laboratory and experiment testing using XRD, XRF, ICP, LECO & DLT (Diagnostic Leach Test), it concluded that sample A was free milling & preg-robbing with percent extraction of Au 95%. However, samples B, C, D, and E are refractories of the ore type, which need to be roasted before processing. Sample B had the highest percentage of gold extraction (89%), in the refractory type ore after roasting. Keywords: Gold, Cyanide, Refractory, Roasting, DLT Share Link | Plain Format | Corresponding Author (FAHNY ARDIAN)

85	Mining Engineering and metallurgy	ABS-14
STUDY OF WOOD REINFORCEMENT ON HAULING ROAD SLOPES AT PT CIPTA KRIDATAMA COAL MINE Dimas Ihsan Bagaskoro, Budi Sulistianto, Tri Karian Institut Teknologi Bandung Abstract Slope failure is a phenomenon that often occurs in surface mines, both on the pit slopes and the disposal slope. One of the most common types of slope failure is a circular failure, which generally occurs on slopes with soil, fractured rock masses, mix material weathered rocks. One of the way that can be done to prevent this circular failure is by installing reinforcement on the mine slopes or changes geometry of the slopes. Wood or logs are a form of reinforcement commonly used on slopes in mining area with soil materials, especially on temporary excavation slopes. Besides being easy to obtain, the use of wood can also reduce costs and is quite easy to implement. However, until now, there are not many guidelines that can be used in installing wood reinforcement in the mining world, especially in Indonesia, which has diverse types of woody plants. This lack of guidelines causes the installation of wood reinforcement in mine slope that is carried out sometimes does not have a strong scientific basis and become ineffective. So, this study will be discussed the effect of various geometrical parameter of the wooden support installation in the mine slope such as the distance of reinforcement, and geometrical pattern to determine the best possible way to install support. This best geometrical pattern will be the recommended pattern to install wooden support in mine slope with special condition like the research example cases, to calculate the factor of safety in this study using the Bishop simplified method. Deformation analysis using RS 2 is used to determine movement or deformation on the slope of the mine road and is used to compare daily movement monitoring obtained from monitoring prism shooting. Keywords: Wooden Support- Slope failure- Bishop Method, Slope Geometry, Monitoring. Share Link | Plain Format | Corresponding Author (Dimas Ihsan Bagaskoro)

86	Mining Engineering and metallurgy	ABS-37
Influence of excavation thickness on the stress distribution around the barrier pillar Rizto Salia Zakri (a,b*), Ridho Kresna Wattimena (a), Simon Heru Prassetyo (a), Tri Karian (a) a)Mining Engineering Study Program, Faculty of Mining and Petrolium Engineering, Institut Teknologi Bandung, 40132, Bandung, West Java, Indonesia *riztoszakri[at]gmail.com b)Mining Engineering Departement, Faculty of Engineering, Universitas Negeri Padang, 25131, Padang, West Sumatera, Indonesia Abstract Underground coal mining using the longwall method is one of the methods that has the best recovery. Obtaining good recovery will affect the dimensions of the excavation which will have an impact on underground stability. The thickness of the coal seam plays a role in determining the height of the excavation which theoretically will have an impact on the height of the GOAF that will be formed. The thickness of the excavation will influence the stress distribution that will occur during and after the excavation takes place. Based on two-dimensional numerical modeling using longitudinal sections, it can be seen that the thickness of the excavation has an effect on the stress distribution on the barrier pillar, the thinner the coal is mined, the greater the stress that occurs on the barrier pillar, conversely, the thicker the material that is mined, the smaller the stress that occurs on the barrier pillar. , these results were obtained by modeling with the assumption that the height of the goaf due to excavation was 4x the height of the excavation. Meanwhile, the depth of excavation does not have a significant influence on stress changes in the barrier pillar. Keywords: Longwall Mining, Stress Distribution, Barrier Pillar, Coal Thickness, Stability Share Link | Plain Format | Corresponding Author (Rizto Salia Zakri)

87	Mining Engineering and metallurgy	ABS-47
A Preliminary synthesis of iron oxalate dihydrate (FeC2O4.2H2O) utilizing by product of titanium dioxide processing from ilmenite ore in Bangka, Indonesia Tri Arini (a,b*), Latifa Hanum Lalasari(b), Eka Nurhidayah(a), Januar Irawan(b), F.Firdiyono(b), Lia Andriyah(b), Fariza Eka Yunita(b), Nadia Chrisayu Natasha(b), Eko Sulistiyono(b), Ariyo Suharyanto(b), Iwan Setiawan(b), Akhmad Herman Yuwono (a,c) (a) Department of Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Depok, West Java, Indonesia 16424 (b) Research Center for Metallurgy, National Research and Innovation Agency Republic of Indonesia, Kawasan Sains dan Teknologi, BRIN, KST B.J. Habibie Gedung Manajemen 720, Tangerang Selatan 15314, Indonesia (c) Advanced Materials Research Center (AMRC), Faculty of Engineering Universitas Indonesia, Depok-16424 *ahyuwono[at]eng.ui.ac.id Abstract Iron (II) oxalate dihydrate (FeC2O4.2H2O) is extensively developed as a functional material, serving various purposes including a cathode material in lithium ferro phosphate (LiFePO4) batteries, pigments, and photocatalysts. Conversely, the conversion of waste or by products into economically significant goods is regarded as an environmentally sustainable project, thus emerging as another prominent research topic in recent years. In consideration of both research interests, this study aims to explore the utilization of TiO2 sulphate liquid waste, which is a by product of the sulphate route of hydrolysis in TiO2 production, as a precursor in the synthesis of FeC2O4.2H2O. The synthesis involves a combination of leaching and precipitation methods, with leaching durations varying from 2 to 5 h at a temperature of 90 C. The materials were characterized using Xray diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP OES), and electron microscopy energy dispersive spectroscopy (SEM EDS). The results of the Xray diffraction (XRD) investigation indicate that during crystallization, FeC2O4.2H2O formed a monoclinic alpha structure. The analytical results obtained from ICP OES indicate that the increase in leaching time from 2 to 5 h resulted in an increase in the Fe concentration from 374.48 to 2220.54 ppm, coupled with a reduction in Fe extraction from 87.32 to 24.82%. The SEM analysis reveals rod-shaped FeC2O4.2H2O samples, with particle sizes ranging from 2.22 to 3.96 micro m, correlating with the increase in leaching time. From the provided data, it can be inferred that the TiO2 sulphate liquid waste has considerable potential to be utilized as a precursor in the synthesis of FeC2O4.2H2O. Keywords: FeC2O4.2H2O, TiO2, precipitation, waste hydrolisis, size distribution Share Link | Plain Format | Corresponding Author (Tri Arini)

88	Mining Engineering and metallurgy	ABS-56
TECHNICAL ASSESMENT OF THE INFLUENCE OF USE BOTTOM AIR DECKING 1/2 METER ON THE POWDER FACTOR VALUE IN LOWWALL AREA C1 AT PT BUKIT MAKMUR MANDIRI UTAMA SITE BINUNGAN, EAST KALIMANTAN Ivonda Vidiya Ricce (a*) Rochsyid Anggara (a) Politeknik Energi dan Pertambangan Bandung Jl. Jend. Sudirman No. 623 Bandung 40211 Abstract Keywords: Air Deck, Digging Time, Fragmentation, Material Recovery, Powder Factort Try to Submit This Sample Abstract Share Link | Plain Format | Corresponding Author (Ivonda Vidiya)

89	Mining Engineering and metallurgy	ABS-59
Application of Convergence - Confinement Method in Analysis for Longitudinal Displacements in Tunnel Singgih Saptono, M Rahman Yulianto, Vega Vergiagara Mining Department, Faculty Technology Mineral Universitas Pembangunan Nasional Veteran Yogyakarta Jalan Pajajaran 104, Condongcatur, Sleman Yogyakarta, 55283, Indonesia Abstract The application of convergence-confinement analysis for tunnel is preliminary analysis standard method for determining tunnel walls displacements and designing support systems for rocks. Furthermore, this convergence-confinement analysis uses an analytical solution (closed form) or with a plane strain numerical model (FEM), a longitudinal displacement profile (LDP) is needed to relate the displacement of the wall tunnel at the excavation stage analyzed in the physical opening along the opening axis. This paper is an application of the LDP formulation developed by Vlachopoulos and Deiderichs (2009) to estimate the influence of the supported distance from the face (working surface) of the tunnel, the spacing between rock bolts diametrically and transversely on the safety factor, as well as the maximum plastic radius that occurs during installation. The parameters used to calculate with assumption the ideal condition changes according to changes in the size of the plastic zone area. Larger plastic zones require relatively longer normal distances to be excavated. Failures in LDP implementation can result in significant errors in the proper positioning of support installation distances (from the face) for tunnel support systems. Examples of errors include the collapse of temporary supports. Keywords: Tunnel, convergence-confinement, displacement Share Link | Plain Format | Corresponding Author (Singgih Saptono)

90	Mining Engineering and metallurgy	ABS-66
MINE PLANNING FOR OVERBURDEN TARGET ACHIEVEMENT IN THE FIRST QUARTER OF 2024 AT PIT 3 PT BINA SARANA SUKSES PT TANJUNG ALAM JAYA JOBSITE BANJAR DISTRICT SOUTH KALIMANTAN Alfandro William (a*), Dian Eka Aryanti (a), Mesias Citra Dewi (a), Novan Bagaskara (b) a) Mining Technology Study Program, Bandung Energy and Mining Polytechnic Jalan Sudirman No. 623, Bandung 40211, Indonesia. *ptppepb2019[at]gmail.com b) PT Bina Sarana Sukses Jobsite PT Tanjung Alam Jaya, Banjar District, South Kalimantan Province, Indonesia Abstract PT Tanjung Alam Jaya plans to conduct mining activities in Pit 3 to extract coal from Seam A, Seam B, and Seam C. This area has dense vegetation and thick overburden material with a dip of 23-25 degree. The steep slope of the coal seam results in a high SR value as the mining deepens. The research method was conducted using quantitative method with primary data collection through field observation and secondary data from PT Bina Sarana Sukses and other sources. The data is processed and analyzed to determine the need for equipment and the planned mining design. The mining design for the first quarter of 2024 will start from the north area and widen to the south, following the strike direction of the coal seam. The design for the first quarter of 2024 Pit 3 is divided into three monthly sequence designs with a total overburden capacity of 2,264,048.21 BCM and 103,555.4 tons of coal, with an SR of 21.86 in accordance with the provisions of 115% of the production capacity of the equipment determined by the company. Equipment required for mining includes loaders and haulers, with a total of 3 loaders and 14 haulers. Overburden production capacity ranged from 621,160.89 BCM to 685,537.27 BCM for each three monthly sequence. Keywords: mine planning, mine design, overburden, sequence, stripping ratio Share Link | Plain Format | Corresponding Author (Alfandro William)

Page 3 (data 61 to 90 of 112) | Displayed ini 30 data/page
<< PREV 1 2 3 4 NEXT >>

Powered By Konfrenzi Ultimate 1.832M-Build7 © 2007-2026 All Rights Reserved