ABSTRACT
The use of Itasca’s Universal Distinct Element Code (UDEC) and the Surpac mine planning package is described in simulating a typical open pit bench blast. A two dimensional section view of a typical single row bench blast is used. Rock mass properties are applied to the model elements and joints. The code can be halted at given time steps and a file of block corner locations generated. This information has been used as input data in Surpac. Surpac has been used to create two-dimensional trapezoids based on these corner locations. Using the variation in location for given time steps, Surpac has been used to generate multiple “snap shots” of the blast movement after detonation. The Surpac model can be coded to indicate geologic features such as rock structure or grade boundaries. Hence, grade boundaries can be tracked through the blast and ultimately, accurate dig limits determined for the loading operation.
