When blasting at the start of a tunnel or in a portal, several safety measures must be taken to control flyrock and ensure the safety of workers and equipment. First, accurate pre-blast assessments should be conducted to determine the optimal amount of explosive and the correct delay timing to minimise excessive rock movement. Proper confinement techniques, such as adequate stemming and using blast mats or protective barriers, should be employed to contain the blast and prevent flyrock based on

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