Abstract: The security systems engineering fault tree analysis method is applied to comprehensively analyze the effect factors on large open metal mine blasting fly stone accident, and draw out the accident tree analysis figure of blasting fly stone. Then, the quantitative calculation based on this foundation is made to get structure importance of blasting fly stone accident, and to analyze the causes and law of blasting fly stone accident, thus providing a scientific basis for the future blasting design, construction and blasting security management. Meanwhile, the main factors which affect blasting fly stone accident are found out, and the corresponding prevention measures are proposed.

Key words: Open-pit mine, Blast flying stone, Fault tree, Structure importance