Surface mines continue to implement highwalls for several reasons, such as increasing recovery, improving margins, and justifying higher stripping ratios. Highwall stability is a complex issue that is dependent upon a variety of mining and geologic factors, and a safe design is necessary for a successful surface operation. To improve highwall stability, it is important to understand the connection between local geology and blasting. Explosives are employed throughout the mining industry for primary rock breakage. There are a number of controlled blasting techniques that can be implemented to improve highwall stability. These include line drilling, smooth wall blasting, trim blasting, buffer blasting, air decking, and presplitting. Each of these techniques have associated advantages and disadvantages. Understanding local geology is necessary for selecting the appropriate controlled blasting technique. Furthermore, understanding the limitations and conditions for successful implementation of each technique is necessary. A discussion of the impact of geologic conditions on highwall stability is provided. Additionally, discussion is provided for the successful incorporation of the controlled blasting techniques listed above, and the associated mining and geologic factors that influence the selection and design of controlled blasting plans. Finally, a new methodology is proposed.
R. Q. Eades and K. A. Perry, "Understanding the Connection between Blasting and Highwall Stability," International Journal of Mining Science and Technology, vol. 29, no. 1, pp. 99-103, China University of Mining and Technology, Jan 2019.
The definitive version is available at https://doi.org/10.1016/j.ijmst.2018.11.016
Keywords and Phrases
Blasting; Geology; Mining; Open pit mining; Stability; Controlled blasting; Geologic conditions; Geologic factors; Highwall; Presplitting; Stripping ratio; Surface mines; Surface operations; Explosives; Highwall stability; Surface mining
International Standard Serial Number (ISSN)
Article - Journal
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01 Jan 2019