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All Journal Jurnal Teknologi Pertambangan Journal of Geoscience, Engineering, Environment, and Technology Indonesian Mining Journal KURVATEK Jurnal Riset Teknik Pertambangan Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Indonesian Mining Journal
Nurkhamim
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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DESAIN SALURAN TERBUKA BERBASIS MICROSOFT EXCEL: Perhitungan dan Pemodelan yang Praktis dan Effisien Faizal Agung Riyadi; Cahyadi, Tedy Agung; Nurkhamim; Supandi
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1563

Abstract

A channel is constructed as a media for water to flow. Phases of plan, design, and construction of a channel require a lot of time, effort, and budget. Design and construction of a channel need to be suited to certain requirements and characteristics of the location. Changes of design parameters often occurred as a result of technical and economical considerations. It leads to changes of channel design to adapt to the new parameters. Hence, the needs of tool to ease the calculation of channel design. Required parameters for channel design calculations are flow (Q), Chezy’s resistance factor (C), Darcy-Weisbach’s coefficient (f), atau Manning’s roughness factor (n), and the channel base gradient (i). The objective of this research are channel design calculations and modelling, in addition profide a tool which is practical and easy to use. The methods are Chezy, Darchy-Weisbach, and Manning formula to calculate the design of varied channel type using Microsoft Excel software. Determinations of Chezy’s resistance factor (C), Darcy-Weisbach’s coefficient (f), can be related to Manning’s roughness factor (n) value. Manning’s roughness factor (n) can be estimated from the size of channel bed’s lining material particles (d) using certain formula or define the value dirrectly from Manning’s roughness factor table.The result of this research including a tool for open channel design calculation and modelling“Kalkulator Desain Saluran – FAR”. The writers propose a new formula to estimate Manning’s roughness factor (n) value from the size of channel bed’s lining material particles (d). In addition, the writers propose formulas to directly calculate water level on the channel geometry section (y). The formula include coefficient of α which is based on relations of channel geometry parameters in to the formula of Chezy, Darchy-Weisbach, and Manning.
OVERVIEW PERBANDINGAN TEKNOLOGI ALTERNATIF AKTIF DAN PASIF DALAM PENGELOLAAN AIR ASAM TAMBANG Shahensah Anand Anggian Rambe; Nurkhamim
Retii 2020: Prosiding Seminar Nasional ReTII ke-15
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ABSTRACT The formation of a metal-rich acid solution known as Acid Mine Drainage (AMD) is a common problem associated with mineral and coal mining in Indonesia. AMD is formed when sulfide minerals such as pyrite (Fe2S) are found to be mixed with coal or overburden in direct contact with oxygen and water during the operational and post-mine closure phases. Therefore, the management of acid mine drainage (AMD) needs to be done so that the water that comes out of the mining area that enters the water does not pollute the environment. Alternative AMD management is generally divided into two, namely active technology and passive technology. The author conducted a comparison of several literatures to analyze active and passive alternative methods, and determine the factors that influence pH changes during treatment. From these results it was found that the selection of the appropriate AMD management method depends on the level of efficiency in the processing of water chemical properties including pH, metal and sulfate concentrations in minimizing costs and risks to the environment. Keywords: Acid mine drainage, active alternative, passive alternative
Review Of Stockpile Management To Reduce The Risk Of Coal Self-Heating, Which Can Cause Spontaneous Combustion Edy Nursanto; Rahimatul Fadhilah; Nurkhamim
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.04.17132

Abstract

One of the energy requirements for fuel is in the form of solid hydrocarbons and as basic materials or feedstocks. Coal is formed from deposits of organic plant compounds that grow in an oxygen-free environment and are influenced by temperature and pressure for a long time. Based on the coal formation process, coal from the highest to the lowest level is anthracite, bituminous, sub-bituminous, and lignite. Low-grade coal has a faster oxidation rate than high-grade coal because it contains inherent moisture, oxygen, and carbon in large quantities, has high porosity, and causes an increase in activation energy resulting in evaporation and a continuous increase in temperature causing spontaneous combustion. Monitoring and control of coal, especially in the stockpile area as a temporary storage place, is carried out to prevent oxidation and self-burning, namely by arranging the piling pattern and applying demolition principles by taking into account the length of the pile, forming the design of the stockpile base surface, calculating the volume, height, side slope, and distance between piles, as well as taking into account wind speed and direction, which greatly influence particle size, porosity, and the rise in temperature of the coal during self-heating. Efforts to handle self-heating in coal can be made by creating drainage in the stockpile area, reducing the height, and forming a slope angle of 15–30° to facilitate compaction of the coal pile so that it can be stored for a long time, as well as minimizing losses from spontaneous combustion and early self-heating detection for safe coal storage.
REVIEW MINERAL KRITIS GLOBAL DAN TANTANGAN EKSPLORASINYA DI INDONESIA Rizal, Khairu; Nurkhamim; Idrus, Arifudin
Indonesian Mining Journal Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No2.2024.1605

Abstract

Global critical minerals will highlight critical minerals such as lithium, cobalt, rare earth elements (REEs) and nickel that are critical in the clean energy transition. The analysis also covers the distribution of critical minerals in different regions of the world, including Europe, Africa, the Middle East, and Asia. It also discusses challenges in the extraction and processing of critical minerals and implications for sustainable exploration practices. The method used was a literature review of journals. The results show that countries such as Australia, the Democratic Republic of Congo, and China have significant critical mineral reserves. However, the African continent also has great potential in providing critical minerals needed for the clean energy transition. Therefore, emphasizing the importance of securing a reliable supply of critical minerals to support industrial and technological ambitions. In conclusion, then, with Australia, China, and Africa as major providers of clean energy, the provision of critical minerals such as nickel, lithium, cobalt, and REEs is essential for the clean energy transition and to control processes and reduce production costs, improve geological data and laboratory facilities for analysis are required. Indonesia has significant reserves for the global transition to clean energy and technological advancement. Hence, it is strategically positioned in the global mineral market as it becomes a focal point for geopolitical competition, especially between major powers. The regulatory framework in Indonesia can be complex and can pose challenges for foreign investment to enter, so addressing these challenges through increased research and regulatory alignment will be critical to unlocking Indonesia's abundant REE resources and meeting global demand.
REVIEW MINERAL KRITIS GLOBAL DAN TANTANGAN EKSPLORASINYA DI INDONESIA Rizal, Khairu; Nurkhamim; Idrus, Arifudin
Indonesian Mining Journal Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No2.2024.1605

Abstract

Global critical minerals will highlight critical minerals such as lithium, cobalt, rare earth elements (REEs) and nickel that are critical in the clean energy transition. The analysis also covers the distribution of critical minerals in different regions of the world, including Europe, Africa, the Middle East, and Asia. It also discusses challenges in the extraction and processing of critical minerals and implications for sustainable exploration practices. The method used was a literature review of journals. The results show that countries such as Australia, the Democratic Republic of Congo, and China have significant critical mineral reserves. However, the African continent also has great potential in providing critical minerals needed for the clean energy transition. Therefore, emphasizing the importance of securing a reliable supply of critical minerals to support industrial and technological ambitions. In conclusion, then, with Australia, China, and Africa as major providers of clean energy, the provision of critical minerals such as nickel, lithium, cobalt, and REEs is essential for the clean energy transition and to control processes and reduce production costs, improve geological data and laboratory facilities for analysis are required. Indonesia has significant reserves for the global transition to clean energy and technological advancement. Hence, it is strategically positioned in the global mineral market as it becomes a focal point for geopolitical competition, especially between major powers. The regulatory framework in Indonesia can be complex and can pose challenges for foreign investment to enter, so addressing these challenges through increased research and regulatory alignment will be critical to unlocking Indonesia's abundant REE resources and meeting global demand.
Perancangan Geometri Peledakan Berdasarkan Karakteristik Batuan dan Struktur Geologi Permukaan Hasil Pemetaan UAV pada Batuan Metamorf di Penambangan Emas Frampton, Samantha Michelle; Saptono, Singgih; Wiyono, Bagus; Nurkhamim; Nursanto, Edy
Jurnal Teknologi Pertambangan Vol. 11 No. 1 (2025): Juni 2025
Publisher : Universitas Pembangunan Nasional Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jtp.v11i1.14710

Abstract

Ukuran fragmentasi hasil peledakan memegang peran penting dalam keberhasilan proses ekstraksi emas di PT J Resources Bolaang Mongondow. Permasalahan yang dihadapi adalah belum optimalnya rancangan peledakan akibat belum diperhitungkannya variasi karakteristik batuan berdasarkan tipe alterasi. Fragmentasi yang tidak sesuai sasaran menghambat proses pelindian dan menurunkan efisiensi operasional. Oleh karena itu, penelitian ini dilakukan untuk menentukan nilai Blastability Index (BI) dari berbagai tipe alterasi batuan metamorf dan menyusun rancangan geometri peledakan yang adaptif terhadap kondisi geologi setempat, sehingga diperoleh fragmentasi batuan dengan ukuran P80 ≤ 10 cm.Penelitian ini dilakukan untuk menentukan nilai Blastability Index (BI) berdasarkan parameter geoteknik dari berbagai tipe alterasi batuan, serta menyusun rancangan geometri peledakan adaptif menggunakan pendekatan teoritis C.J. Konya, R.L. Ash, dan ICI Explosive. Penelitian melibatkan pemetaan struktur geologi menggunakan UAV dan fotogrametri, pengukuran BI dengan metode Lilly (1986), analisis fragmentasi aktual menggunakan Split Desktop, serta simulasi fragmentasi teoritis dengan model Kuz-Ram. Hasil penelitian menunjukkan bahwa pendekatan Konya menghasilkan fragmentasi paling mendekati target (P80 ≤ 10 cm), terutama pada batuan dengan RF tinggi. Model Kuz-Ram efektif memprediksi distribusi ukuran berdasarkan nilai A dari BI. Pendekatan berbasis BI terbukti efisien dan adaptif, serta mampu meningkatkan kinerja pelindian. Oleh karena itu, rancangan geometri peledakan berbasis Konya direkomendasikan untuk diterapkan di lokasi penelitian.
Karakteristik Endapan Emas Aluvial dan Alternatif Pengelolaan Pencemaran pada Proses Pengolahannya Agum Widhiyatmoko, Damas; Ernawati, Rika; Nurkhamim
Jurnal Riset Teknik Pertambangan Volume 5, No. 1, Juli 2025, Jurnal Riset Teknik Pertambangan (JRTP)
Publisher : UPT Publikasi Ilmiah Unisba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29313/jrtp.v5i1.5777

Abstract

Abstrak. Sungai Lok Ulo di Kabupaten Kebumen, Jawa Tengah, merupakan wilayah dengan aktivitas penambangan emas aluvial yang cukup intensif. Aktivitas ini berpotensi menurunkan kualitas air sungai, yang merupakan sumber air penting bagi masyarakat sekitar. Penelitian ini bertujuan mengevaluasi dampak penambangan emas aluvial terhadap kualitas air Sungai Lok Ulo menggunakan pendekatan analisis laboratorium yang sistematis. Parameter yang dianalisis meliputi Total Dissolved Solids (TDS), Total Suspended Solids (TSS), pH, serta kandungan logam berat seperti besi (Fe), mangan (Mn), dan seng (Zn). Uji statistik ANOVA digunakan untuk menilai hubungan antara aktivitas penambangan dan perubahan kualitas air. Hasil menunjukkan peningkatan kadar TSS hingga 78% pasca penambangan, sementara pH air turun menjadi 6,2, mengindikasikan kecenderungan keasaman. Konsentrasi logam berat, khususnya Fe (0,93 mg/L) dan Mn (0,45 mg/L), melebihi ambang batas kualitas air sesuai standar nasional. Analisis ANOVA mengonfirmasi adanya hubungan signifikan antara aktivitas penambangan dan penurunan kualitas air. Temuan ini menegaskan bahwa penambangan emas aluvial di kawasan tersebut berdampak negatif terhadap lingkungan perairan dan menyoroti pentingnya penerapan strategi pengelolaan yang lebih berkelanjutan untuk meminimalkan pencemaran. Abstract. The Lok Ulo River, located in Kebumen Regency, Central Java, is a region experiencing intensive alluvial gold mining activities. These operations have the potential to degrade water quality, which is crucial for the surrounding communities. This study analyzes the environmental impact of such mining using a comprehensive scientific method. Water quality was assessed through several parameters, including Total Dissolved Solids (TDS), Total Suspended Solids (TSS), pH, and heavy metal concentrations such as iron (Fe), manganese (Mn), and zinc (Zn). Samples were collected from upstream, midstream, and downstream locations near mining sites. Statistical analysis using ANOVA was applied to determine the relationship between mining intensity and changes in water quality. The results show that mining significantly increased TSS levels by up to 78% compared to pre-mining conditions. The pH dropped from neutral to 6.2, indicating increased acidity. Heavy metals, particularly Fe (0.93 mg/L) and Mn (0.45 mg/L), exceeded Indonesian water quality standards. ANOVA results confirmed a statistically significant correlation between mining activity and water quality degradation. These findings highlight the environmental risks of alluvial gold mining in the Lok Ulo River and emphasize the need for stronger environmental management and mitigation strategies to preserve water quality and protect local ecosystems.
SEBARAN DAN KORELASI MINERAL KRITIS PADA ENDAPAN SKARN Pb-Zn DI DESA CIHAUR, KABUPATEN SUKABUMI, JAWA BARAT Rizal, Khairu; Nurkhamim; Idrus, Arifudin
Indonesian Mining Journal Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No1.2025.1655

Abstract

This research investigates ore samples from Cihaur Village, Sukabumi District, West Java, which exhibit significant skarn alteration in limestone, is examined for its petrographic and mineragraphic features. Secondary minerals identified include pyroxene, garnet, calcite, and opaque minerals, while the primary ore minerals are chalcopyrite (CuFeS2), galena (PbS), and sphalerite (ZnS). Five samples were analyzed geochemical analysis using the ICP-MS method to assess the concentration of important elements including Pb, Zn, Cu, Ag, Sb, Bi, Cd, Mg, Al, Ca, Fe, and As. Element distribution patterns were examined using spider diagrams, providing insight into environmental gradients influencing mineral exploration. The study revealed a high positive correlation between Pb and Zn, suggesting co-deposition in sulfide mineralization. Pb also correlates strongly with Ag and Sb. This study confirms the considerable economic potential of the Sukabumi skarn deposits for Pb, Zn, Cu, and precious metals such as Ag. Exploration value is increased when essential minerals like Sb and Cd are present. Variations in geochemical conditions indicate the influence of magmatic intrusions and hydrothermal activity on element distribution. These results provide a solid foundation for further exploration to delineate mineralization zones in the region
SEBARAN DAN KORELASI MINERAL KRITIS PADA ENDAPAN SKARN Pb-Zn DI DESA CIHAUR, KABUPATEN SUKABUMI, JAWA BARAT Rizal, Khairu; Nurkhamim; Idrus, Arifudin
Indonesian Mining Journal Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No1.2025.1655

Abstract

This research investigates ore samples from Cihaur Village, Sukabumi District, West Java, which exhibit significant skarn alteration in limestone, is examined for its petrographic and mineragraphic features. Secondary minerals identified include pyroxene, garnet, calcite, and opaque minerals, while the primary ore minerals are chalcopyrite (CuFeS2), galena (PbS), and sphalerite (ZnS). Five samples were analyzed geochemical analysis using the ICP-MS method to assess the concentration of important elements including Pb, Zn, Cu, Ag, Sb, Bi, Cd, Mg, Al, Ca, Fe, and As. Element distribution patterns were examined using spider diagrams, providing insight into environmental gradients influencing mineral exploration. The study revealed a high positive correlation between Pb and Zn, suggesting co-deposition in sulfide mineralization. Pb also correlates strongly with Ag and Sb. This study confirms the considerable economic potential of the Sukabumi skarn deposits for Pb, Zn, Cu, and precious metals such as Ag. Exploration value is increased when essential minerals like Sb and Cd are present. Variations in geochemical conditions indicate the influence of magmatic intrusions and hydrothermal activity on element distribution. These results provide a solid foundation for further exploration to delineate mineralization zones in the region
Co-Authors Agum Widhiyatmoko, Damas Arifudin Idrus Bagus Wiyono, Bagus Cahyadi, Tedy Agung Edy Nursanto Edy Nursanto Faizal Agung Riyadi Frampton, Samantha Michelle Rahimatul Fadhilah Rika Ernawati Rizal, Khairu Shahensah Anand Anggian Rambe Singgih Saptono, Singgih