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All Journal Jurnal Pertambangan dan Lingkungan JURNAL PERTAMBANGAN
Ericson Ericson
Jambi University
Earth & Planetary Sciences Engineering Environmental Science

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Analisis Failure Time Menggunakan Data GPS Geodetic dengan Metode Inverse Velocity pada Lereng Disposal HW 123 South Tutupan PT. Adaro Indonesia, Kalimantan Selatan Hanswily Sinaga; Anggi Deliana Siregar; Ericson Ericson
Jurnal Pertambangan dan Lingkungan Vol 5, No 2 (2024): Desember 2024
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpl.v5i2.28259

Abstract

PT. Adaro Indonesia is one of the largest coal companies in Indonesia with one of its production operations located in the southern tutupan pit area. This research was conducted to analyze the failure time that occurred in the outpit dump area of the southern tutupan pit. There is a development pattern behavior that occurs on the slope, namely linear reaching behavior, onset of failure (OOF), progressive reaching behavior, failure to post-failure reaching behavior. From the deformation, the slope movement status of the three GPS used (G21, G73, and G76) is known, namely safe conditions are at a speed of ˂ 50 mm, careful conditions are at a speed of 50 mm - 85 mm, alert conditions are at a speed of 85 mm - 105 mm, and dangerous conditions are at a speed of ˃ 105 mm. Furthermore, a back analysis of landslides was carried out from deformation data with different time windows. Landslide predictions with time windows (1 hour, 3 hours, 12 hours) each occurred on the dates (February 9, February 10, February 10) and time windows (1 day, 3 days, 6 days) occurred on the dates (February 11, February 12, February 14). So the 3-hour time window is appropriate. The 3-hour time window data will be used to carry out forward analysis of landslides based on deformation data taken from March 14 - April 30. From the results of the deformation, velocity, and inverse velocity calculations, the predicted time of the landslide occurred on June 12. Furthermore, the engineer can carry out an evacuation where the evacuation time is 6 hours before the landslide occurs.
RANCANGAN ULANG ULTIMATE PIT LIMIT DENGAN MEMPERTIMBANGKAN FLUKTUASI HARGA BATUBARA ACUAN PADA PIT GAR 2900 M. F. Seprizal; Juventa Juventa; Ericson Ericson; A. Yanottama
Jurnal Pertambangan Vol. 9 No. 1 (2025): Februari 2025
Publisher : Fakultas Teknik Universitas Sriwijaya

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Abstract

Industri pertambangan batubara di Indonesia khususnya tambang batubara kalori rendah, menghadapi tantangan signifikan akibat fluktuasi Harga Batubara Acuan (HBA) yang mengalami kenaikan 240% dari tahun 2020 sampai dengan 2022 dan penurunan sekitar 90% dari tahun 2022 hingga 2025. Fluktuasi ini berdampak pada perencanaan tambang dan penentuan batas penambangan (ultimate pit limit), serta mempengaruhi luas pit dan cadangan yang dapat diambil, termasuk pada Pit Abimanyu di PT Putra Muba Coal yang memiliki cadangan batubara kalori rendah. Penelitian ini bertujuan merancang ulang ultimate pit limit dengan mempertimbangkan perubahan Harga Batubara Acuan menggunakan metode Incremental Pit Expansion. Hasil menunjukkan bahwa pada harga batubara acuan USD 34,70 per ton, Pit Abimanyu dapat beroperasi pada stripping ratio (SR) 1,64 dengan luas pit 243,7 Ha dan cadangan 43,36 juta ton. Namun, jika harga batubara turun 50%, pit tersebut tidak lagi bernilai ekonomis karena nilai BESR kurang dari satu (1) atau biaya pengupasan overburden sudah lebih besar daripada keuntungan yang didapatkan. Dengan demikian, penelitian ini memberikan kontribusi penting dalam pengembangan strategi perencanaan tambang yang adaptif terhadap dinamika pasar serta penyesuaian desain pit untuk memastikan keberlanjutan operasional perusahaan.
Co-Authors A. Yanottama Anggi Deliana Siregar Hanswily Sinaga Juventa juventa M. F. Seprizal