Authors: Campbell, R; Mardiansyah, F; Banda, H; Tshisens, J; Griffiths, C; Beck, D

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This paper is hosted with the kind permission of the Universidad de Chile, Eighth International Conference & Exhibition on Mass Mining, 2020.


DOI https://doi.org/10.36487/ACG_repo/2063_03

Cite As:
Campbell, R, Mardiansyah, F, Banda, H, Tshisens, J, Griffiths, C & Beck, D 2020, 'Early experiences from the Grasberg block cave: A rock mechanics perspective', in R Castro, F Báez & K Suzuki (eds), MassMin 2020: Proceedings of the Eighth International Conference & Exhibition on Mass Mining, University of Chile, Santiago, pp. 115-126, https://doi.org/10.36487/ACG_repo/2063_03

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Abstract:
As the Grasberg open pit is completed in 2019, the underlying Grasberg Block Cave (GBC) will rapidly mature as a primary source of production at PT Freeport Indonesia operations, supplementing the Deep Ore Zone (DOZ) and Deep Mill Level Zone (DMLZ) caves. After years of planning, development and revisions to the extraction strategy, early information on footprint rock mass response to undercutting and the nature of caving is now available to confirm or guide adjustments to strategy. Despite the early stage of mining, much has been learned regarding cave propagation, fragmentation, stress states, pillar stability and ground support performance. This paper provides a timely rock mechanics focused update from one of the largest planned caving mines in the world. 

References:
Beck, DA, & Putzar, G 2011, ‘Coupled flow-deformation simulation for mine scale analysis of cave initiation and propagation’, in Harmonising Rock Engineering and the Environment - Proceedings of the 12th ISRM International Congress on Rock Mechanics, pp. 359-362.
Bewick, R, Campbell, R, Brzovic, A & Schwarz, A 2019, ‘Incorporating veined rock mass characteristics into engineering design and caving’ in 53rd US Rock Mechanics/Geomechanics Symposium, New York, Paper 304.
Campbell, R, Banda, H, Fajar, J & Brannon, C 2018, ‘Optimising for success at the Grasberg Block Cave’, in Proceedings of Caving 2018: ed/s. Y. Potvin & J. Jakubec, Australasian Institute of Mining and Metallurgy, Perth, pp. 3-16.
Pierce, M, Campbell, R, Llewelyn, K, Simanjuntak, K, Kurniawan, A, Haflil, D, Meiriyanto, F, Fuenzalida, M, & Rogers, S 2020, ‘Cave propagation factor for local assessment of caving rate, fragmentation and productivity at PTFI’, Proceedings of MassMin 2020, Santiago, Chile.




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