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Fly rock is one of the reluctant phenomenon in blasting operation. Several factors are effective in producing fly rock. As a whole, these factors can be divided into two groups; controllable parameters (blasting pattern) and uncontrollable parameters (geo-mechanical characteristics). One of the most important controllable parameters in blasting operation is blast hole diameter. Proper diameter is the diameter which is optimum from technical and economical point of view. Normally, statistical methods can be used fo...