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Journal of Earth and Marine Technology (JEMT)
Published by Institut Teknologi Adhi Tama Surabaya
ISSN : -     EISSN : 27238105     DOI : https://doi.org/10.31284/j.jemt
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Physics Transportation
Earth Science and planetary, Geology, Geochemistry, Geophysics, Geodesy, Geomatics, Geotech, Rock mechanics, Mining engineering, Natural Disaster, Land and ocean development, Natural resources, Environmental science, Social impact of mining and marine activity, Science and technology in mapping and surveying, Optical remote sensing and radar remote sensing, Cadastre and 3D modeling, Geodynamics theory and application, Geospatial, Land Surveying, Geomarine, Photogrammetry, Marine engineering
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 10 Documents
 1 
Search results for , issue "Vol 5, No 1 (2024)" : 10 Documents clear
Reclamation performance assessment at PT. Trubaindo Coal Mining in Melak field, West Kutai, East Kalimantan Province, Indonesia Gastramat, Maria Frumensia; Fanani, Yazid; Galih Cahyono, Yudho Dwi
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.5984

Abstract

Trubaindo Coal Mining Ltd. was established on March 13, 1990, as a subsidiary of Banpu Company. Based in Thailand, Banpu operates within the coal mining industry. Mining activities can have adverse effects, including habitat disruption for flora and fauna, morphological alterations, and reduced soil productivity. To mitigate these impacts, reclamation activities are essential. In compliance with PERMENHUT Number P.60/Menhut-II/2009 and the Minister of Energy and Mineral Resources Decree No. 1827 K/30/MEM/Year 2018, assessing the success of reclamation efforts is a critical step. This study aims to assess and evaluate reclamation activities conducted during the production operation phase at Trubaindo Coal Mining Ltd., focusing on land areas within Pit 3000 BK-04 NB and Pit 4500/P6200 BK03-04 SB1. The research employed a quantitative descriptive method, which included observations on land preparation, revegetation efforts, and final land stabilization. The findings revealed reclamation success rates of 87.3 and 83.1, indicating that the reclamation efforts were generally acceptable but required further improvements. Recommendations include soil pH correction, enhancement of drainage channels, and effective management of weeds, pests, and plant diseases.
Assessment of Drainage Efficiency in the Backfill Disposal Area of East Air Laya Mine Field at PT. Bukit Asam; A case study from Tanjung Enim, South Sumatera, Indonesia Suci, Fitri Indah Dwi; Fanani, Yazid; Cahyono, Yudho Dwi Galih
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.5942

Abstract

This research undertakes a thorough evaluation of the drainage systems in the disposal areas at PT. Bukit Asam during the October 2023 sequence, with the objective of understanding the factors that influence the capacity and efficiency of disposal mounds, the density of materials used, the geometric structure of disposal sites, and the design dimensions of open drainage channels. Utilizing the trapezium volume formula, the study meticulously calculated the planned disposal volumes at various elevations—2,289,155 Bank Cubic Meters (BCM) at 36 meters, 1,004,112 BCM at 42 meters, and 669,892 BCM at 48 meters—comparing these against an actual obtained volume of 1,799,111.4 BCM. The substantial variance between the planned and actual volumes highlights the critical challenges in achieving predictive accuracy in disposal management. Further assessments were conducted using the Dynamic Cone Penetrometer (DCP) with a 60-degree cone to determine the density and sub-grade California Bearing Ratio (CBR) of the barrier materials, which were found to be suitable for road construction, falling under sub-grade C classification. Moreover, the Gumbel method was applied to devise the dimensions of a trapezoidal open channel, designed to facilitate a drainage capacity of 100,432.996 cubic meters per hour over a length of 3000 meters. The channel dimensions included a bottom width of 1.1 meters, a top width of 2.3 meters, a depth of 2.4 meters, and a 45-degree slope, with a Manning’s coefficient (n) of 0.03. This detailed inquiry not only provides vital insights into the operational adjustments required for effective drainage but also promotes the adoption of sustainable and safe disposal management practices in the mining industry. The findings from this study serve as a pivotal reference for future improvements in the design and management of mine waste disposal systems
Analysis of The Use of Onshore Power Supply Facility at Port of Berlian Kustanto, Jaka Septian; Rachman, Natriya Faisal; Nurdiansari, Henna; Gupron, Akhmad Kasan
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.6441

Abstract

Ships contribute to CO2 gas emissions. The government's effort to reduce these emissions is by having Onshore Power Supply (OPS) facilities. OPS is a technology that allows ships at anchor to turn off their engines and connect to the local electricity network for electricity supply. Port of Berlian currently has 8 OPS spot managed by PT. Lamong Energi Indonesia. The use of OPS still needs to be examined using valid methods. In this research, researchers use the assessment methodology that has been used at the port of Lisbon regarding this onshore electricity facility type of port where the ship is docked (mooring vessel). In this methodology, the assessment process carried out includes data gathering and data processing processes. Apart from this process, it is necessary to review the character of the port or terminal that we will examine ships that most often use land-based electricity facilities are ships with a size of 1000-2999 GT. The use of land electricity facilities provides cost efficiency of 78%. This land electricity facility is used by General Cargo and Container type ships. These results indicate that the use of land electricity facilities is still inefficient ( 2.7%) and there is a need for further review of the implementation of existing policies.
Planning for Normalization of the Apu River in the Post-Mining Area Gunawan, Risal; Ernawati, Rika; Cahyadi, Tedy Agung
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.6432

Abstract

Miners often leave traces such as irregular river channels, holes in the mining area without repair measures, the mining area is located in Boyolali Regency, precisely in the Apu River area. Apu River is one of the centers of Merapi sand mining which is quite large, mining activities have the potential to cause river overflows. For this reason, improvements need to be made. This study aims to plan a post-mining model in a river that has changed, the method in this study is to take water discharge directly with 5 sampling points and analyze the distribution of gumbell rainfall for 10 years and make a comparison, then a trapezoidal open channel plan is made and modeled in HEC-RAS software. Based on the results of taking river water discharge, it is known that the maximum river flow velocity is 0.57 m3/second, while the results of the rainfall analysis are 2.77m3/second. so that in repairing the cross-section using a higher water discharge. The method of repairing the river cross-section is the trapezoidal open channel method, the dimensions of the open channel are designed using a manning roughness of 0.30. The initial design depth of the channel was 1.35 m plus 0.60 m to avoid flood overflow, so that the channel depth became 1.95 m.
Productivity Analysis of Digging, Loading, and Hauling Equipment in Overburden Removal Activities at PT. Anugrah Borneo Sinergy in Keramat Mina field, South Kalimantan, Indonesia Taufiq, Muhammad Rusdi; Putri, Fairus Atika Redanto; Fanani, Yazid
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.6426

Abstract

This study evaluates the productivity of loading and hauling equipment at Anugrah Borneo Sinergy Ltd., explicitly focusing on compatibility between these units and identifying obstacles in overburdening material transfer activities. Employing a direct observation method at pit 1 in Keramat Mina Village, this research spanned a day shift from August 20 to September 20, 2022. Productivity measurements were taken for the Sany SY 365 H Excavator and the Hino 500 FM 260 JD Dump Truck, alongside employee interviews for supplementary data. Results indicate that the excavator's productivity varied daily, averaging 136.07 Bcm/hour, while the dump truck averaged 56.19 Bcm/hour over the same period, both below the target of 170 Bcm/hour. Initial compatibility assessment yielded a match factor of 0.83, which improved to 1.18 after optimizing cycle times. Simulating the compatibility with an additional hauler resulted in a perfect match factor of 1. Key obstacles included extended waiting and haul times, inefficiency, and an imbalance in the number of loaders versus haulers. Recommendations to enhance productivity involve optimizing loading efficiency and reducing haul, return and wait times. Post-optimization, productivity improved significantly, reaching 163.28 Bcm/hour for loaders and 88.29 Bcm/hour for haulers, thus meeting production goals. Adding another hauling unit could sustain these improvements by achieving optimal equipment compatibility.
The Potential of Biochar for Heavy Metal Adsorption in Acid Mine Drainage Based on Literature Review Simamora, Eprilia; Nurcholis, Mohammad; Ardian, Aldin; Ernawati, Rika; Winarno, Eddy
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.6772

Abstract

Incorporating organic materials that contain biochar is gaining traction as a research area for the cleanup of wastewater contaminated with heavy metals. This study intends to explore the potential of biochar-based materials in removing heavy metals from water sources, with a particular emphasis on rehabilitating aquatic environments affected by mining waste. Identifying appropriate literature studies in collecting research data from various scientific publications was used to understand the topic. Several biochar manufacturing processes are generated through pyrolysis, gasification, and Hydrothermal carbonization (HTC). In this field, studies revealed that using most biochar can achieve relatively high metal removal. Research findings indicate that Cu, Zn, Cd, Pb, Ni, Cr, Co, As, Ag, Fe, Al, and Mn are the metal ions that have received the most attention in this field. This study highlights explicitly the effectiveness of biochars made from orange peel, nutshell, compost, rice husk, oak wood, used coffee grounds, durian bark, Phragmites australis corn cob, dregs of cascara, and hickory wood. The findings show that biochars from these materials, especially those produced at high pyrolysis temperatures (≥500°C), can achieve metal removal efficiencies above (≥90%). Various factors can influence the effectiveness of biochar in removing heavy metal ions, including the pH of the contaminated water, the amount of biochar used, the initial concentration of heavy metals, the properties of the biochar, and the specific forms or speciation of the metals. Biochar's ability to draw in and retain metal ions can be influenced by its characteristics, including its surface area and pore sizes. This study highlights the need for more research in this field going forward. It gives a general review of the use of biochar in removing heavy metals from water, particularly contamination in Acid Mine Drainage (AMD).
Estimation of Nickel Laterite Resources and Reserves Using Ordinary Kriging and Inverse Distance Weighting (IDW) Methods: A Case Study from the Kolaka Block, PT Indrabakti Mustika, North Konawe Regency, Southeast Sulawesi Putra, Inga Kharisma; Sari, Avellyn Shinthya; Yuwanto, Sapto Heru
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.6190

Abstract

This study aims to assess the geological domains and estimate the nickel laterite resources and reserves within the Kolaka Block exploration area at PT Indrabakti Mustika, utilizing the Ordinary Kriging and Inverse Distance Weight (IDW) methods. The research employs quantitative and qualitative approaches to evaluate the geological framework and estimate the nickel laterite resources and reserves. Geological domain classification—limonite, saprolite, and bedrock layers—was achieved through detailed core section analysis, which informed the delineation of the nickel laterite zones. Based on the IDW method, the resource estimation results indicate 3,180,350 m³ (4,611,509 metric tons) of nickel laterite resources. This is subdivided into limonite zone resources (1,547,475 m³ or 2,243,840 metric tons) and saprolite zone resources (1,632,875 m³ or 2,367,669 metric tons). Using the Ordinary Kriging method, the total nickel laterite resource is estimated at 3,212,275 m³ (4,657,801 metric tons), with the limonite zone contributing 1,562,500 m³ (2,265,627 metric tons) and the saprolite zone contributing 1,649,775 m³ (2,392,174 metric tons). For the reserve estimation, the IDW method suggests a total of 1,205,875 m³ (1,748,520 metric tons) of nickel laterite reserves. These reserves are divided into limonite zone reserves (456,275 m³ or 661,600 metric tons) and saprolite zone reserves (749,600 m³ or 1,086,920 metric tons). In contrast, the Ordinary Kriging method estimates a total of 1,142,225 m³ (1,656,227 metric tons) of reserves, with limonite zone reserves of 516,700 m³ (749,216 metric tons) and saprolite zone reserves of 625,525 m³ (907,011 metric tons). These findings provide a comprehensive understanding of nickel laterite's geological and resource distribution in the Kolaka Block, offering crucial data for further exploration and development activities at PT Indrabakti Mustika.
PM2.5 Exposure and Health Symptoms in Elderly Residents: A Case Study in Jakarta during the COVID-19 Pandemic Qonitan, Fatimah Dinan; Hilmi, Farhan M; Sarwono, Ariyanti; Ulhasanah, Nova; Wijaya, Angga Eka
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.6996

Abstract

The deterioration of air quality in Jakarta, Indonesia, has become a growing public concern. Exposure to polluted air is known to be hazardous to public health, particularly for sensitive groups such as elderly citizens. PM2.5 (fine particulate matter with an aerodynamic diameter 2.5 μm) is among the most dangerous pollutants commonly found in urban atmospheres. This study assessed the relationship between atmospheric PM2.5 exposure and health-related symptoms among elderly citizens living in Jakarta, Indonesia. PM2.5 concentrations in ambient air were measured using a High Volume Air Sampler with a PM2.5 size-selective inlet for a week in an outdoor location at a nursing home during the Covid-19 pandemic. Health-related symptoms of elderly citizens were collected using a systematic interview method. Both sets of data were collected simultaneously for cross-sectional analysis. Based on the sampling data, PM2.5 concentrations in the area ranged from 15.4 to 42.9 μg/Nm3 (at standard conditions); the Air Pollution Standard Index ranged from 49.9 to 84.3; and the Air Quality Index was moderate for 6 out of 7 (85.7%) days. Results showed that sensitive groups, including elderly citizens, are very likely to be negatively affected by polluted air. The chi-square test results imply that emerging health-related symptoms are significantly affected by elderly citizen characteristics, such as age, gender, smoking habit, and residence time, rather than by the Air Quality Index. 
Analysis of the Relationship between Thermal Comfort Levels and Green Open Space in Semarang City, Using the Humidex Method Faridatussafura, Nurzaka; Yulfiah, Yulfiah
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.7005

Abstract

The rapid urban development has increased the density of buildings and decreased the Green Open Space (RTH), thereby affecting the thermal comfort of an area. The level of thermal comfort can be observed from the characteristics of temperature and humidity. The determination of thermal comfort levels, especially in Semarang City, is conducted using the Humidex method. The calculation results show Humidex values ranging from 38.83°C to 41.10°C, categorized as uncomfortable to very uncomfortable. The highest Humidex value was recorded at the Semarang Climatology Station in 2023, while the lowest was at the Ahmad Yani Semarang Meteorology Station in the same year. Meanwhile, Landsat 8 imagery analysis shows that from 2014 to 2023, the total land cover transition in Semarang reached 68.541 km² for buildings; 63.104 km² for tree vegetation; 1.353 km² for other vegetation; and 6.784 km² for water bodies. By the end of the research period in 2023, the area of tree vegetation in Semarang City was 91.187 km². The analysis of the relationship between Humidex values and the area of building cover shows a correlation coefficient of 0.87, indicating an increase in building cover area that has raised the Humidex value in Semarang City. Furthermore, the correlation of Humidex with the area of RTH is -0.83, meaning there is a strong negative linear relationship between the Humidex values and the RTH area, or the larger the RTH cover, the lower the Humidex value in Semarang City. To maintain or improve the level of thermal comfort in Semarang City, it is recommended to balance the distribution of RTH locations, especially in the northern and eastern parts of Semarang. The Semarang City government should enhance the quality of RTH by choosing appropriate vegetation, performing regular maintenance, improving facilities and services around RTH, and continuously educating the public.
Provenance Analysis from Lemat Formation in Lubuk Lawas and Lubuk Bernai Areas, Jambi Subbasin, Jambi Province Daryono, Sapto Kis
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.7242

Abstract

The study of the sedimentary rocks from the Lemat Formation in Bukit Tigapuluh, particularly in the Lubuk Lawas and Lubuk Bernai Areas, aims to clarify and provide an overview of the formation’s history and the evolution of Paleogene stratigraphy within the Jambi Subbasin. Provenance analysis was concluded using petrographic analysis to determine the classification of sandstone types, source rock characteristics and tectonic order. Sandstones in the Lubuk Lawas and Lubuk Bernai areas are classified into Lithic arkose, arkosic, subarkose, felspathic litharenite, silty claystone, sublitharenite and subarkosic wacke. Petrographic data revealed that these sandstones originated from a tectonic setting within the recycled orogenic zone, with sub-zones varying between quartzose recycled, transitional recycled and mixed. This variation indicates a combination of primary source rocks and recycled orogens. Paleocurrent data derived from the sedimentary structures of sandstones in the Lubuk Bernai area suggest deposition directions from the southwest and southeast.

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