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Here are the key parameters in the rock blastability index equation: - cn = dry sonic velocity normal to foliation (m/s) - cp = dry sonic velocity parallel to foliation (m/s) - Ia = cp/cn= anisotropy - c = (cp+cn)/2 = dry sonic velocity (m/s) - w = detonation velocity of explosive (m/s) - ρ = rock density (g/cm3) - LT = joint frequency (joints/m) The rock blastability index SPR gives the amount of explosives (kg/m3) needed to blast the rock to a fragmentation size where 50%

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