Blast-induced rock damage and the optimized blast design in a mine: A case study

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An analysis was conducted to determine the effects of blasting on slope stability and downstream comminution processes. To investigate these effects, the extent of blast-induced rock damage and the magnitude of induced stress were examined. This analysis showed that damage may extend up to 500 meters (1MPa, tensile strength) in the rock mass, a distance that is sufficient to impact the pit-scale slope over the long term. In addition, the damage zone was calculated using the reasonable assumption that compressive waves are the primary agent in microfracturing during blast fragmentation. The calculated damage zone- up to 5.6 meters (30MPa, 30% of the compressive strength)- indicates that microfracturing can occur throughout the entire rock mass in the blasting area. Finally, an economic analysis was conducted by comparing two reasonably assumed blasts in a copper mine. The change in energy required for crushing and grinding was demonstrated using Bond)s law after increasing the blast energy from 180kcal/t to 350kcal/t. A total cost saving of 13.3% ($9.4M) was achieved with the increase. An optimal blast design should consider both slope stability (safety) and downstream comminution energy (production).

Original languageEnglish (US)
Title of host publication2014 SME Annual Meeting and Exhibit, SME 2014
Subtitle of host publicationLeadership in Uncertain Times
PublisherSociety for Mining, Metallurgy and Exploration
Pages309-313
Number of pages5
ISBN (Print)9781632665263
StatePublished - Jan 1 2014
Event2014 SME Annual Meeting and Exhibit: Leadership in Uncertain Times, SME 2014 - Salt Lake City, UT, United States
Duration: Feb 23 2014Feb 26 2014

Publication series

Name2014 SME Annual Meeting and Exhibit, SME 2014: Leadership in Uncertain Times

Other

Other2014 SME Annual Meeting and Exhibit: Leadership in Uncertain Times, SME 2014
CountryUnited States
CitySalt Lake City, UT
Period2/23/142/26/14

ASJC Scopus subject areas

  • Geochemistry and Petrology

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  • Cite this

    Kim, K. (2014). Blast-induced rock damage and the optimized blast design in a mine: A case study. In 2014 SME Annual Meeting and Exhibit, SME 2014: Leadership in Uncertain Times (pp. 309-313). (2014 SME Annual Meeting and Exhibit, SME 2014: Leadership in Uncertain Times). Society for Mining, Metallurgy and Exploration.