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All Journal JURNAL REKAYASA TEKNOLOGI INFORMASI International Journal of Engineering, Science and Information Technology INTAN Jurnal Penelitian Tambang Teknologi Sipil : Jurnal Ilmu Pengetahuan dan Teknologi Journal of Sustainable Transformation Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan JURNAL TEKNOLOGI MINERAL FT UNMUL Venus: Jurnal Publikasi Rumpun Ilmu Teknik Jurnal Teknologi Sumberdaya Mineral
Ardhan Ismail
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EVALUASI PEMECAH GELOMBANG PANTAI MANGGAR BARU Devedo, Mochamad Gaharu Dida; Ismail, Ardhan
Journal of Sustainable Transformation Vol. 3 No. 02 (2025)
Publisher : Universitas Nahdlatul Ulama Kalimantan Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59310/jst.v3i02.55

Abstract

The coastal protection structure in the form of an offshore breakwater has been constructed at Manggar Baru Beach by the local government to address the ongoing issue of coastal erosion. However, despite its construction, several problems remain unresolved. This study aims to evaluate the performance of the constructed breakwater and provide recommendations for alternative, more effective coastal protection designs. The research involves assessing the performance of the breakwater structure and designing alternative coastal protection solutions. The data used in this study consists of secondary data obtained from the East Kalimantan Public Works Department. The evaluation results reveal that in areas near the river mouth, waves are still able to pass through the breakwater structure. Additionally, the river flow, which bends towards the area between the beach and the breakwater, allows water to enter without sufficient protective structures to block it. This indicates that the existing breakwater is not fully effective. As a solution, the proposed coastal protection concept involves extending the length and increasing the height of the breakwater structure. The breakwater is planned to be a rubble structure with the following specifications: crest elevation of +5.5 m LLWL, a total length of 136 m, primary armor layer consisting of tetrapods and crushed stones, and a crest width of 3.2 m.
DESIGN OF PIT X BASED ON PRODUCTION TARGETS USING MINE SCHEDULING CONCEPT AT PT Y Ismail, Ardhan; Mochamad Gaharu Dida Devedo; Pontus, Albertus Juvensius; Thomas , Anita oktoviana L.P.G.M.
INTAN Jurnal Penelitian Tambang Vol. 8 No. 2 (2025): INTAN: Jurnal Penelitian Tambang
Publisher : Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56139/intan.v8i2.349

Abstract

Pit design in surface mining requires a systematic approach that considers operational capacity and efficiency to ensure optimal production target achievement. In the actual condition of the second quarter of 2025, pit X design at PT Y was carried out manually using a trial-and-error method. This method was time-consuming and less flexible to parameter changes, and caused significant deviations from production targets, with overburden reaching 110%, coal only 89%, and stripping ratio increasing to 4.19 from the target of 3.39. This study aims to develop pit design based on Mine Scheduling Concept using SPRY Scheduler software to improve operational effectiveness and efficiency. An applied quantitative method was implemented by integrating reserve data from Minescape, heavy equipment parameters including availability, utilisation, and hourly rate, as well as a mining calendar aligned with operational conditions in the third quarter of 2025. The results show that the generated pit design achieves production targets with very high accuracy: overburden of 4,093,991 Bcm with a deviation of -0.02%, coal of 1,206,663 MT with a deviation of 0.00%, and a stripping ratio of 3.39 as targeted. The application of SPRY Scheduler produces measurable, accurate, and adaptive pit designs without trial-and-error processes, supporting efficient and sustainable mine planning.
Evaluasi Produksi Overburden Menggunakan System Six Big Losses pada Pit K1 Mahakam PT. Insani Baraperkasa Kecamatan Loa Janan Kabupaten Kutai Kartanegara Provinsi Kalimantan Timur Nurhamidah, Nurhamidah; Harjuni Hasan; Ardhan Ismail
Venus: Jurnal Publikasi Rumpun Ilmu Teknik  Vol. 3 No. 5 (2025): Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/venus.v3i5.1164

Abstract

Overburden removal is a critical phase in coal mining operations, as it directly affects production continuity and operational efficiency. However, production realization often deviates from the mine plan due to various operational constraints. This study, conducted at Pit K1 Mahakam of PT. Insani Baraperkasa, evaluates the causes of underachievement in overburden stripping targets using the Six Big Losses framework, which classifies inefficiencies into Breakdown Losses, Setup and Adjustment Losses, Idling and Minor Stops, Reduced Speed Losses, Process Defect Losses, and Reduced Yield Losses. The analysis revealed that the dominant losses were Reduced Speed Losses (26%) and Setup and Adjustment Losses (10%), primarily caused by disposal congestion, shift changes, and repairs at the loading and disposal areas. Minor contributions were found from idling (3%), production losses (5%), while breakdown losses showed negligible impact. These factors led to increased standby time and reduced equipment cycle effectiveness. Improvement strategies are recommended through optimized disposal allocation, reduction of waiting time, and stricter control of external operational disruptions to enhance stripping efficiency and achieve production targets.
Studi Pengaruh Lama Penumpukan Batubara terhadap Kualitas Proximate Batubara di ROM Coal Stockpile pada PT Multi Harapan Utama Kabupaten Kutai Kartanegara Provinsi Kalimantan Timur Ronal Ronal; Windhu Nugroho; Revia Oktaviani; Agus Winarno; Ardhan Ismail
Venus: Jurnal Publikasi Rumpun Ilmu Teknik  Vol. 3 No. 6 (2025): Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/venus.v3i6.1218

Abstract

During the coal stockpiling process, the quality of coal may increase or decrease due to direct exposure to open environmental conditions, which can lead to changes in its characteristics. The longer the coal is stored in an open area, the more it undergoes changes caused by rainfall, heat, and air exposure, resulting in an increase in moisture content and ash content, while the calorific value decreases. Therefore, this research was conducted to determine the optimal coal stockpiling duration at the ROM coal stockpile to ensure that the calorific value does not significantly decrease. Coal sampling was carried out every two days from the initial time of stockpiling. After a two-month stockpiling period, the final coal quality results showed a total moisture of 13.89% (ar), inherent moisture of 15.95% (ad), ash content of 4.59% (ad), volatile matter of 40.3% (ad), and fixed carbon of 39.16% (ad). Based on these results, it can be concluded that the recommended storage duration for MCV-HS type coal at the ROM coal stockpile is 154 days. The laboratory analysis results obtained during the research indicate that the longer the coal is stored, the higher the moisture content and ash content become, while the calorific value continues to decrease. This occurs due to water absorption and oxidation reactions that take place during the coal storage period in the ROM coal stockpile.
Studi Kapasitas Pompa Untuk Pengendalian Air Tambang Di PIT 302 PT Jembayan Muarabara Kabupaten Kutai kartanegara Angraeni, Thessa; Hasan, Harjuni; Ismail, Ardhan
JURNAL TEKNOLOGI MINERAL FT UNMUL Vol 13, No 2 (2025): Jurnal Teknologi Mineral FT UNMUL Desember 2025
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jtm.v13i2.22354

Abstract

Dalam kondisi inilah, sistem pemompaan air (dewatering) memegang peran penting, Penelitian ini dilakukan di pit 302 PT Jembayan Muarabara, Penambangan di pit ini dilakukan dengan metode tambang terbuka, seperti halnya kebanyakan tambang batubara di wilayah Kalimantan. Pengambilan data dilakukan secara aktual dilapangan dan perencanaan yang ada diperusahaan, proses pengolahan data ini sendiri menggunkan software dan Microsoft Excel.Debit Limpasan yang dihasilkan dari perhitungan data curah hujan sebesar 50.139,54 m3 per hari dari luas daerah tangkapan hujan (cathment area) sebesar 483,80 hektar, sehingga dari debit limpasan itu didapatkan jumlah kebutuhan pompa yang harus digunnakan sebanyak 3unit pompa multiflo MF 420EX, dengan debit aktual sebesar 14.604 m³ per hari, serta volume rancangan sump sebesar 1.051.027 m³.
Perencanaan Counterweight untuk Meningkatkan Kestabilan Lereng dan Kapasitas Disposal pada Area Disposal T4 PT Unggul Dinamika Utama Provinsi Kalimantan Timur Nurfitri Kasran; Revia Oktaviani; Ardhan Ismail; Tommy Trides; Albert Juvensius Pontus
Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Vol. 4 No. 1 (2026): Februari: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/globe.v4i1.1318

Abstract

The stability of disposal slopes is a critical aspect of open-pit mining operations because it directly affects operational safety and the continuity of overburden dumping activities. Disposal areas composed of overburden materials generally exhibit heterogeneous characteristics, particularly when soft materials such as mud are present, which can significantly reduce slope stability. Therefore, a comprehensive slope stability evaluation is required prior to further disposal development. This study aims to assess the stability condition of a disposal slope under initial conditions, evaluate the influence of material conditions, and analyze the effectiveness of counterweight application in improving both the safety factor and disposal capacity. The research methodology involved the collection of primary and secondary data, including slope geometry, lithological conditions, and the physical and mechanical properties of disposal materials obtained from laboratory testing and company technical data. Slope stability analysis was performed using the limit equilibrium method with the assistance of geotechnical software, taking into account groundwater conditions and operational loading. The analysis results indicate that the initial disposal condition yielded a safety factor of 0.718, indicating an unstable slope condition. After simulating the removal of mud material, the safety factor increased to 0.907 but remained below acceptable stability criteria. The application of a counterweight significantly improved slope stability, resulting in a safety factor of 1.498. Further optimization through slope geometry redesign produced a final safety factor of 1.101, which satisfies the requirements stipulated in KEPMEN ESDM No. 1827 K/30/MEM/2018. Additionally, the redesign increased the disposal capacity from 119,507,864.23 LCM to 119,682,378.22 LCM, representing an increase of 174,513.99 LCM. These results demonstrate that counterweight application combined with geometric optimization is effective in enhancing both slope stability and disposal capacity.
Pengaruh Pelapukan Berdasarkan Nilai Indeks Durability Terhadap Stabilitas Lereng: Studi Kasus Lereng Jalan Jalur Lintas Selatan Segment Legundi – Planjan, Gunungkidul, Yogyakarta Winonazada, Rety; Ardhan Ismail
JENERAL Vol. 6 No. 2 (2025)
Publisher : JENERAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jeneral.v6i2.60001

Abstract

Pembangunan Jalan Jalur Lintas Selatan (JJLS) di Gunungkidul memotong formasi batugamping dengan geometri lereng tinggi dan curam yang berpotensi mengalami ketidakstabilan akibat proses pelapukan. Penelitian ini bertujuan mengetahui pengaruh tingkat pelapukan terhadap stabilitas lereng menggunakan pendekatan nilai indeks durabilitas. Metode penelitian meliputi pengujian laboratorium untuk menentukan sifat fisik dan mekanik batuan (kuat tekan uniaksial dan kuat geser), uji slake durability berdasarkan standar ISRM untuk klasifikasi tingkat pelapukan, serta pemodelan numerik metode elemen hingga menggunakan Rocscience RS2 untuk analisis stabilitas. Hasil menunjukkan sampel batugamping dari STA 0+700 dan STA 3+800 termasuk kelas pelapukan II (slightly weathered) dengan indeks durabilitas 96,18-96,75%. Nilai SRF bervariasi: STA 0+700 sebesar 4,62; STA 3+800A sebesar 2,14; dan STA 3+800B sebesar 3,46. Penurunan nilai indeks durabilitas menyebabkan penurunan nilai SRF, menunjukkan bahwa pelapukan mempengaruhi stabilitas lereng batugamping. Selain itu kestabilan lereng juga dipengaruhi oleh parameter kuat geser efektif dan kondisi massa batuan, sehingga penilaian kestabilan lereng menggunakan pendekatan indeks durabilitas perlu dianalisis bersama hasil uji mekanik dan model numerik.
The Role of the Mining Sector in Regional Economic Development: A Case Study of East Kutai Regency Ismail, Ardhan; Ananda, Dea Mierela; Winarno, Agus; Oktaviani, Revia; Setiawan, Arif; Winonazada, Rety; Supriyanto, Supriyanto
International Journal of Engineering, Science and Information Technology Vol 5, No 4 (2025)
Publisher : Malikussaleh University, Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52088/ijesty.v5i4.1765

Abstract

This study examines the role of the mining sector in East Kutai Regency's regional economic development, where mining contributes over 40% to GRDP. An integrated analytical framework combining Input-Output analysis with overlay analysis techniques (Location Quotient, Klassen Typology, and Shift-Share) was employed to comprehensively assess the mining sector's structural position, inter-sectoral linkages, and development impact. The Input-Output analysis utilized East Kalimantan's 2016 table updated via RAS method to generate regency specific coefficients, while overlay analysis employed GRDP statistics for 2014 to 2023 to evaluate spatial concentration and competitive dynamics. Input-Output findings reveal the mining sector exhibits weak backward linkage of 1.0 and forward linkage of 0.95, positioning it in Quadrant III with minimal inter-sectoral integration and limited multiplier effects on the regional production system. Overlay analysis through Location Quotient demonstrates the mining sector's highest comparative advantage at 1.76, indicating strong export orientation and spatial concentration. However, Klassen Typology classifies it in Quadrant IV as a lagging sector with growth coefficient of 0.94 and contribution coefficient of 0.93, reflecting stagnant development performance. Shift-Share analysis within the overlay framework confirms the mining sector's severe competitiveness decline at negative 35,714.67, the worst among seventeen evaluated sectors. The convergent results from Input-Output and overlay analyses indicate the mining sector operates as an extractive enclave with insufficient value-added generation and constrained developmental spillovers. Enhancing the mining sector's developmental role requires strengthening backward and forward linkages through downstream processing facilities, local content requirements, and technology transfer mechanisms to transform the sector from an extractive enclave into an integrated regional growth driver.
Studi Pengaruh Derajat Kejenuhan Terhadap Kuat Geser Tanah Anandyta Suci Ramdani; Revia Oktaviani; Ardhan Ismail; Tommy Trides; Albertus Juvensius Pontus
Venus: Jurnal Publikasi Rumpun Ilmu Teknik  Vol. 4 No. 1 (2026): Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/venus.v4i1.1341

Abstract

Soil strength characteristics are strongly influenced by its physical and mechanical properties, one of which is shear strength. Soil shear strength is affected by cohesion (c), internal friction angle (ϕ), and soil moisture conditions. In open-pit mining conditions, soil moisture content is greatly influenced by rainfall and water seepage, which can increase the degree of saturation within the soil mass. An increase in the degree of saturation generally leads to a rise in pore water pressure, thereby reducing the effective normal stress and resulting in a decrease in soil shear strength. This study aims to determine the effect of the degree of saturation on soil shear strength. This research employs a quantitative method to analyze the influence of the degree of saturation under three conditions (natural, dry, and saturated) on soil shear strength through laboratory testing using the direct shear test. The tests conducted include soil physical properties testing in accordance with SNI 1965-2008, specific gravity testing based on SNI 1964-2008, and soil shear strength testing following SNI 3420-2016. The results indicate that the average degree of saturation under natural conditions is 64.63% with a cohesion value of 7.4 kN/m², under dry conditions is 33.18% with a cohesion value of 8.2 kN/m², and under saturated conditions is 83.08% with a cohesion value of 3 kN/m². It can be concluded that a higher degree of saturation or more saturated soil samples result in lower cohesion values, whereas a lower degree of saturation or drier soil samples lead to higher cohesion values.
Co-Authors Agus Winarno Agus Winarno, Agus Albert Juvensius Pontus Albertus Juvensius Pontus Ananda, Dea Mierela Anandyta Suci Ramdani Angraeni, Thessa Arif Setiawan Devedo, Mochamad Gaharu Dida Fajar Ramadhan Harjuni Hasan Harjuni Hasan Henny Magdalena Jhony Maxi Harjadi Juan, Juan Lucia Litha Respati Mochamad Gaharu Dida Devedo Muhammad Rahul Shidiq nadhirawaty, rizqi Nurfitri Kasran Nurhamidah Nurhamidah Nurhidayatullah Am Pontus, Albertus Pontus, Albertus Juvensius Rety Winonazada Revia Oktaviani Revia Oktaviani ronal ronal Ruslan Patur Sari, Chalsi Mala Shalaho Dina Devi Shalaho Dina Devy Supriyanto Supriyanto Supriyanto, Muhammad Ibadurrahman Arrasyid Thomas , Anita oktoviana L.P.G.M. Tommy Aria Pradana Tommy Trides windhu Nugroho Winonazada, Rety