Estimating of Maximum Groundwater Level to Trigger Landslide in Batu Hijau Open Pit Mine, West Nusa Tenggara, Indonesia

Amirul Aiman Abd Karim(1), Wahyu Wilopo(2*), I Gde Budi Indrawan(3), Yan Adriansyah(4)

(1) Geological Engineering Department, Faculty of Engineering, Gadjah Mada University, Indonesia
(2) Geological Engineering Department, Faculty of Engineering, Gadjah Mada University, Indonesia
(3) Geological Engineering Department, Faculty of Engineering, Gadjah Mada University, Indonesia
(4) Department of Geotechnical & Hydrogeological, PT. Amman Mineral, West Nusa Tenggara
(*) Corresponding Author


The safety of the employees is essential in the mining activity area. Thus, the sloping wall of the pit needs to evaluate from time to time to avoid any loss due to landslide. One of the essential parameters to lead to slope failure is groundwater. Therefore, this paper highlights the limitations of the groundwater for the existing slope mine by analyzing it for several groundwater levels until it reached a safety factor below 1.2. The analysis was done using a finite element method for slope stability and finite element analysis for groundwater seepage for groundwater modeling. The results show that the safety factor of the slope showing a linearly decreasing trend and safety factor reached below 1.2 when 70 m increment in groundwater level from the original groundwater level model.


Landslide, anisotropy model, groundwater level, safety factor, Batu Hijau

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AMNT (2019a) Geological Interpretation Map Data, PT Amman Mineral Nusa Tenggara (unpublished report).

AMNT (2019b) Geotechnical Line Mapping Data, PT Amman Mineral Nusa Tenggara (unpublished report).

AMNT (2019c) Laboratory Test Data, PT Amman Mineral Nusa Tenggara (unpublished report).

Bar, N. and Mcquillan, A. (2018) 3D Limit Equilibrium Slope Stability Analysis for Anisotropic and Faulted Rock Masses in Australian Coal and Iron Ore Mines ARMS10: 10th Asian Rock Mechanics Symposium (ISRM International Symposium for 2018). 12p.

Beale, G. and Read, J. (2013) Evaluating Water in PitSlope Stability. CSIRO Publishing, 600p.

BPS Sumbawa Barat District. (2019) Jumlah Curah Hujan dan Hari Hujan di Kecamatan Sekongkang dan Sekitarnya. Available at: 2018.html(Accessed: 13 July 2019).

Carlile, J. C., and Mitchell, A. H. G. (1994) Magmatic arcs and associated gold and copper mineralization in Indonesia, Jurnal of Geochemical Exploration, 50(1–3), pp. 91–142.

Faturrahman, D. P. (2019) Analisis Kestabilan Lereng Guna Mengoptimalkan Desain Pit Bottom Phase 7 PT. Amman Mineral Nusa Tenggara Kabupaten Sumbawa Barat. Universitas Pembangunan Nasional ‘Veteran’, 76p.

Garwin, S. (2002) The Geologic Setting of IntrusionRelated Hydrothermal Systems near the Batu Hijau Porphyry Copper-Gold Deposit, Sumbawa, Indonesia. In R. J. Goldfarb & R. L. Nielsen (Eds.), Integrated Methods for Discovery: Global Exploration in the Twenty-First Century(Denver, Co, Vol. 9), pp. 333-366.

Griffiths, D. V., and Lane, P. A. (1999) Slope stability analysis by Finite Elements, Géotechnique, 51(3), pp. 387–403.

Hammah, R., Yacoub, T. and Corkum, B. (2005) The Shear Strength Reduction Method for the Generalized Hoek-Brown Criterion, in Alaska Rocks 2005, The 40th U.S. Symposium on Rock Mechanics (USRMS): Rock Mechanics for Energy, Mineral and Infrastructure Development in the Northern Regions. Anchorage, Alaska. 7p.

Irwansyah (2016) What do scientists say on climate change ? A study of Indonesia newspaper, Pacific Science Review B: Humanities and Social Sciences, pp. 58–68.

Kim, J., Jeong, S., Park, S., and Sharma, J. (2004) Influence of rainfall-induced wetting on the stability of slopes in weathered soils, pp. 251–262.

Li, Y., Xiao, T., Cao, Z. J., Phoon, K. K., and Zhou, C. B. (2019) Slope stability analysis with reference to rainfall infiltration in the Yongping Copper, 116(4), pp. 536-543.

Read, J. and Stacey, P. (2009) Guidelines For Open Pit Slope Design. CSIRO Publishing, 496p.

Suradi, M., Fourie, A. B. and Saynor, M. J. (2015) An experimental and numerical study of a landslide triggered by an extreme rainfall event in northern, pp. 1125-1138.

Wen, A., Sturzenegger, M., and Stead, D. (2014) Analysis of a Complex Rock Slope Instability with a Stepped Failure Surface using Discrete Fracture Network Models, (October), in International Discrete Fracture Network Engineering Conference (DFNE 2014). 10 p.

Wesseloo, J. and Read, J. (2009) Acceptance Criteria, in Guidelinefir Open Pit Slope Design. CSIRO Publishing, pp. 221-235.

Yiming, W., Siame, T. and Bowa, V. M. (2019) Effects of Rainfall Patterns on The Stability of Upper Stack of Open Pit Slopes, (March), pp. 51-61

Yudhanto, B. A. (2019) Pemodelan Airtanah pada Pit Batu Hijau PT Amman Minerak Nusa Tenggara, Kabupaten Sumbawa Barat, Provinsi Nusa Tenggara Barat. Universitas Pembangunan Nasional ‘Veteran’, 45p.


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