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The crushing energy for applications in the mineral processing industry is usually determined by an empirical bond index, regardless of the mechanical properties of a rock. Although several attempts have been made to obtain the comminution energy based on theoretical approaches, it would be beneficial to examine this relation based on a physical concept. In this paper, some Saudi samples of bauxite, kaolinite, granodiorite, magnetite, granite, feldspar and quartz were tested for hardness, abrasion, compressive strength as well as modulus of elasticity and the bond work index of these samples was estimated. The value of the bond work index of the above samples has shown a variation from 10.8 kWh ton -1  for bauxite (high abrasion value and low compressive strength) to 20.4 kWh ton -1  for granite (low abrasion value and high modulus of elasticity). The correlation between the abrasion value (X 2 ) and work index (W i ) is found to be W i  = −1.8 Ln(X 2 ) + 11.5 with a correlation coefficient of 0.80.

Correlation Between Work Index and Mechanical Properties of some Saudi Ores