Marklund, P-I, Sjöberg, J, Ouchterlony, F & Nilsson, N 2007, 'Improved Blasting and Bench Slope Design at the Aitik Mine', in Y Potvin (ed.), Slope Stability 2007: Proceedings of the 2007 International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering, Australian Centre for Geomechanics, Perth, pp. 279-292, https://doi.org/10.36487/ACG_repo/708_16
(https://papers.acg.uwa.edu.au/p/708_16_Marklund/)
Abstract: The Aitik open pit mine, located in northern Sweden, currently faces a substantial production increase, 
which has necessitated a review and update of design guidelines. This work pointed at the possibility of 
increasing interramp slope angles a few degrees, which, in turn, requires an improved bench slope design, 
most notably blasting techniques. Building upon previous development work, new field trials were conducted 
in conjunction with trimming of the footwall slope to increase ore extraction. Different blast designs were 
tested and the resulting blast damage was evaluated through measurements and follow-up. These trials 
quantified the limits in terms of achievable bench face angles and amount of backbreak. The detrimental 
effects of small-scale structures could be controlled through lighter smooth blasting, whereas the impact of 
larger, more dominant, structures, prevailed even for very light smooth (for open pit operations) blasting. 
For the footwall, presplit blasting in inclined (70°) holes over the full double-bench height, proved to be 
suitable in terms of both achievable bench slope geometry, and production concerns. For the hangingwall, a 
presplit blast design is used in specific areas to ensure that sufficient ramp width is achieved. The study 
reported here has effectively provided limits on the maximum achievable bench slope angles at the Aitik 
mine, as well as an increased confidence in the bench face design currently being implemented at the mine.