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We are going to give an example on blast pattern design for the case of underground drift (4 x 3m) with rectangular cross section. Parameters that we are using are:   Rock: Tensile strength = 6 MPa Poisson’s ratio = 0.25 Explosive: Density 1.1 g/cm3 VOD = 4.1 km/s Drilling: Hole diameters = 51mm Charge… Continue reading Blasting pattern design