Comminution is incredibly energy-intensive, and improving efficiency not only saves mining operations money but also reduces their ecological footprint. This sub-committee aims to assist the industry by defining methods and best practices for the industry. 

The Industrial Comminution Efficiency Sub-Committee aims to provide tools for practitioners to measure the energy efficiency of comminution circuits using standardized metrics and methodologies. The group is a community of interest that includes operators, suppliers, and subject-matter experts interested in improving comminution efficiency in their operations. 

This sub-committee is led by the Mineral Processing Working Group.

Three guidelines developed by this group aim to define the recommended methods for quantifying grinding circuit efficiency using grinding power analysis, following the approaches developed by Bond (1961) and Morrell (2009). 

Potential future work by this sub-committee might cover topics such as fine grinding ore characterization basis, standard Bond ball charge, Bond test reference materials, site-specific energy, and testing for design. 


The Morrell Method to Determine the Efficiency of Industrial Grinding Circuits Guideline (Revision) and Determining the Bond Efficiency of Industrial Grinding Circuits Guideline (Revision) have now been published. Thank you to all of those who were involved in this project and contributed to the publication of these guideline revisions. We encourage you to share these guidelines with your company and network and to get involved in future projects on mineral processing.


Following review, a minor revision of Method to Survey and Sample Grinding Circuits for Energy Efficiency is underway. If you would like to know more about this revision or are interested in future work under this subcommittee, fill out the contact form below and we’ll be in touch with more details.


    GMG Guideline Morrell2016 Aug | Morrell method for determining comminution circuit specific energy and assessing energy utilization efficiency of existing circuits

    The guideline reviews the data required for the analysis, including hardness characterization data generated from the SMC Test®, the Bond Ball Mill Test Work Index and the Morrell equations and their application. Click here to read.

    GMG Guideline Surveying and Sampling2016 Apr | Methods to survey and sample grinding circuits for determining energy efficiency

    This guideline details methods to survey and sample grinding circuits to generate sufficient information of suitable quality to support reliable efficiency analysis by these and comparable methods. It deals specifically with surveying and sampling Autogenous Grinding (AG), Semi-Autogenous Grinding (SAG), rod, and ball mill circuits operating within the normal range of application. Click here to read.

    GMG Guideline Bond Efficiency2016 Feb | Determining the Bond Efficiency of industrial grinding circuits

    The Bond method allows for quantification and comparison of relative energy efficiencies of most industrial communication circuits. It is an essential tool for managing the important business (cost) of grinding. Click here to read.