RISK MANAGEMENT THROUGH LANDSLIDE BACK ANALYSIS IN GRASBERG MINE, PAPUA

M. Lalang, Sukaerang Sukaerang, E. Widijanto

Abstract


Grasberg is an ‘ultra-deep’ open pit copper-gold mine located in the highland of Jayawijaya mountain range of Papua province, Indonesia. Throughout its long history, Grasberg had critical geotechnical challenges that pose a threat to their operational and mining infrastructures. Landslide is one of the geotechnical hazards that has extreme potential damage that need to be further addressed. In general, one of the routines for approaching landslide behavior is through numerical analysis which is called a runout analysis.

There are three main tasks to run this analysis:

1. Modeling back-analysis on the past landslide events at Grasberg to define behavioral parameters that meet its actual components namely maximum distance reached, thickness, and deposits distribution of debris flows. 

2. Prediction of upcoming model of landslide events that incorporating mm precision topographical survey and detailed geological structure identification via laser scanning as a reasonable landslide’s thickness limit.

3. Development of risk management based on predictive landslide model and working criteria as a guidance for mine operation 

The combination of runout analysis and slope movement criteria which was provided by radar monitoring will give clear guidance and required action plans from mining operation team to address potential landslide issues in the mine to provide safe-productive mine operation.


Keywords


landslide, geotechnical hazards, runout analysis, back-analysis, risk management, safe-productive mine operation

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References


Widijanto, E. R., Gautama, P., Siburian, J., Sirait, A., Yuniar., 2018: Slope Optimization Program to Maximize Pit Value Grasberg Surface Mine, Papua- Indonesia, 10th Asian Rock Mechanics Symposium.

Silaen, H, Pramuji, et. al., 2011: Hydrogeological and Pore Water Pressure Characterization at South West Sector of Grasberg Open Pit, Papua, Proceeding The 36th HAGI and 40th IAGI Annual Convention and Exhibition, Makassar, 26 – 29 September 2011.

O. Hungr Geotechnical Engineering, 2010, DAN3D: Dynamic Analysis of Landslides in Three Dimensions Beta Version 2

Rose, N. D., Hungr, O., 2007: Forecasting Potential Rock Slope Failure in Open Pit Mines

Using the Inverse-Velocity Method, International Journal of Rock Mechanics and Mining Sciences, Vol. 44, pp 308-320.

PT Freeport Indonesia, 2020, Grasberg Geotechnical Working Criteria-Action Plan and Emergency Communication – Standard Operating Procedure, Internal Document.


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DOI: https://doi.org/10.36986/ptptp.v0i0.222

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