1) Equivalent diameter of core sample, DE? (mm?) 4 x (Averge width x Depth) DE2 = 3.14 2) Point Load Strength Index, Is (MPa) (Load, P x 1000) Is = 3) Is(50) (MPa) = n 0.45 DE Is(50) = Is x 50 4) UCS (MPa) = UCS (MPa) = 1s(50) x a a = 20 ( for soft rocks) a = 24 (for hard rocks) *before proceeding with the calculation, ensure all the rock samples passed the shape requirement for the point load tests. (30