An error occurred on page 40 of the April 2002 issue of T&TI. In the Technical Review feature ‘Predicting tool wear in drill and blast’ figure 2 and figure 4 show on the Y-axis 0.5, 1.0 up to 4.0… drilled meters per bit. This should read 500m, 1000m up to 4000m. T&TI apologises for any confusion that this may have caused.
