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All Journal Indonesian Mining Journal Jurnal Teknik Industri Terintegrasi (JUTIN) Indonesian Mining Journal
Fahrezi, Muhammad Akmal
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Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Studi Cost Benefit Analysis di Kolam Renang Ranca Tales Mini Waterboom Putra, Mohammad Alam Adeyaka; Fahrezi, Muhammad Akmal; Sudianto, Toto
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 3 (2025): July
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i3.47681

Abstract

In this study, the economic feasibility of the 10% discount promotion on weekdays during the off-season at Ranca Tales Mini Waterboom Swimming Pool in Serang City was assessed. Cost-benefit analysis (CBA) was used as the quantitative approach, and data were obtained through documentation, interviews, and observation. Results showed a 40% increase in the number of visitors; in three months, revenue increased from Rp13,200,000 to Rp17,820,000, with promotional costs of Rp1,800,000 deducted, which resulted in a net benefit of Rp2,820,000 and a Benefit-Cost Ratio (BCR) value of 2.57. In addition to increasing financial returns, this strategy increases customer loyalty, employee motivation, and company competitiveness. As a result, a similar promotion is recommended for the next quiet period.
PROBABILITAS LONGSOR TIMBUNAN DI AREA IN PIT DUMP ASAM TIMUR DAERAH KONSESI PT ARUTMIN INDONESIA TAMBANG ASAMASAM, KALIMANTAN SELATAN Fahrezi, Muhammad Akmal; Zakaria, Zulfiadi; Khoirullah, Nur; Laksana, Prima
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.No1.2025.1628

Abstract

Open pit mining involves excavation of soil and overburden, which requires a well-planned disposal area to maintain stockpile stability. This is achieved through an analysis of soil bearing capacity and slope stability. The research was conducted at the ASTIM In Pit Dump (IPD) using actual materials. Data were obtained from direct shear tests and physical properties tests, then statistically analyzed to determine the average value, standard deviation, and minimum and maximum relative values. These data were subsquetly input into geotechnical software to perform a slope stability analysis under pessimistic conditions, including water-saturated slopes with a horizontal seismicity coefficient of 0.045. The simulation results did not meet the stability criteria, yielding a safety factor of 0.647. Therefore, engineering design modifications were necessary, including widening the slope angle to 7.61°, consisting of six steps with a level height of 5 meters, a width of 30 meters, and a slope angle of 25°. This redesign resulted in a safety factor (SF) of 1.254 which meets slope stability criteria based on Bowles (1989) and a probability of failure (PoF) of 4.1%, in accordance with the Decree of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018.
PROBABILITAS LONGSOR TIMBUNAN DI AREA IN PIT DUMP ASAM TIMUR DAERAH KONSESI PT ARUTMIN INDONESIA TAMBANG ASAMASAM, KALIMANTAN SELATAN Fahrezi, Muhammad Akmal; Zakaria, Zulfiadi; Khoirullah, Nur; Laksana, Prima
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.No1.2025.1628

Abstract

Open pit mining involves excavation of soil and overburden, which requires a well-planned disposal area to maintain stockpile stability. This is achieved through an analysis of soil bearing capacity and slope stability. The research was conducted at the ASTIM In Pit Dump (IPD) using actual materials. Data were obtained from direct shear tests and physical properties tests, then statistically analyzed to determine the average value, standard deviation, and minimum and maximum relative values. These data were subsquetly input into geotechnical software to perform a slope stability analysis under pessimistic conditions, including water-saturated slopes with a horizontal seismicity coefficient of 0.045. The simulation results did not meet the stability criteria, yielding a safety factor of 0.647. Therefore, engineering design modifications were necessary, including widening the slope angle to 7.61°, consisting of six steps with a level height of 5 meters, a width of 30 meters, and a slope angle of 25°. This redesign resulted in a safety factor (SF) of 1.254 which meets slope stability criteria based on Bowles (1989) and a probability of failure (PoF) of 4.1%, in accordance with the Decree of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018.
Co-Authors Khoirullah, Nur Laksana, Prima Putra, Mohammad Alam Adeyaka Sudianto, Toto Zakaria, Zulfiadi