### THE EFFICIENCY OF BLASTING VERSES CRUSHING AND …

Crush 3.24 $0.07 $0.23 Grind 17.82 $0.07 $1,25 Summarizing Bond calculations and actual energy for size reduction.(Wi = 16.71) TABLE 2 PROCESS FEED PRODUCT W(CALC) W(Actual) Apparent SIZE SIZE kw -hr/lt kw -hr/lt Efficiency Blast 4 m .5 m .15 0.43 36% Crush.5 m 2 cm .95 3.24 29% Grind 2 cm 60 micron 20.39 17.82 114%