Solved At an urban quarry, a drill and blast contractor has
At an urban quarry, a drill and blast contractor has to produce +/-20,000 tonnes of blasted sandstone (2.70 t/m3), which will be fed to a 30 x 42 jaw crusher. The bench height is 15m and they use a hydraulic drill rig with 76mm drill bits. To obtain the required fragmentation, history has indicated that a powder factor of 0.80 or greater is ...
