Determining the Bond Efficiency of Industrial Grinding Circuits 

GMG Guideline Bond Efficiency

Published: 2016-02-18
Working Group: Mineral Processing Working Group 
Status: Ongoing Revision Pending Final Approvals


This guideline is for measuring comminution efficiency in global mine operations using the Bond method and comprehensive Bond Work Index. This method allows personnel to quantify and compare relative energy efficiencies and offers a mode of benchmarking to observe energy consumption. It is an essential tool for managing the important business (cost) of grinding.  The guideline first presents the method for Bond Efficiency determination, which applies to most brittle materials in their naturally occurring (unscalped) size distributions being treated in size reduction circuits down to an 80% passing size of the circuit product (P80) of approximately 70 µm. It then outlines the equipment and procedures for rod mill, ball mill, and impact crushing bond work index testing. 


Bond, F. C. (1946, January). Crushing tests by pressure and impact. Mining Technology, T.P. No. 1895.

Bond, F. C. (1947). Crushing tests by pressure and impact. AIME Transactions, 169, 58–66.

Bond, F. C. (1957). Non-cataracting ball mill study. Engineering and Mining Journal, 158(3), 98–105.

Bond, F. C. (1960). Action in a rod mill. Engineering and Mining Journal, 161(3), 82–85.

Bond, F. C. (1961, August). Crushing and grinding calculations.
Reprinted from British Chemical Engineering, Parts I and II, with additions and revisions, April, 1962. Allis-Chalmers Publication No. 07R9235D.


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