Flyrock phenomena and area security in blasting-related accidents

Abstract

In both the mining and construction industries, blasting is the predominant method for fragmentation of consolidated mineral deposits. The blasting process, however, remains a potential source of numerous hazards to people and surrounding objects. This paper presents the results of the research study on flyrock phenomena and blast area security related accidents in surface mining. The study revealed that a total of 45 fatal and 367 non-fatal accidents in coal, metal and non-metal surface mines had occurred between 1978 and 1998 where the primary causes were the lack of blast area security, flyrock, premature blast, and misfires. The lack of blast area security and flyrock accounted for 281 (68.2%) accidents. Investigations of flyrock accidents have revealed one or more of the following contributing factors: discontinuity in the geology and rock structure, improper blasthole layout and loading, insufficient burden, very high explosive concentration, and inadequate stemming. The study also shows that accidents due to lack of blast area security are caused by failure to use appropriate blasting shelter, failure to evacuate humans from the blast area, and inadequate guarding of the access roads leading to the blast area. The research results should have a positive impact on hazard awareness, prevention, and safe blasting practices in mining and construction industries.