Welcome to DJB Consultants Inc.






Comminution Consultants:
Crushing and Grinding – DJB Consultants Inc.

Comminution Specialists providing Independent Assessment of Grinding Circuit Design based on an Analysis of Different Comminution Test Protocols and Recommendations for:

Planning Dedicated Sample Drill Hole Locations for a “Geo-Metallurgical/Comminution Study” at Conceptual, and/or Pre-Feasibility, and/or Bankable Feasibility Level (Identification of Sample Intervals, the Number of Samples, Flow Charts for Selecting Samples and Identification of Comminution Test Protocols).

Specification of Comminution Test Programs and Scope of Work for Test Laboratories (Third-Party Monitoring of Test Laboratory Procedures and QA/QC protocols and Assessment of Comminution Test Results).

Definition of Specific Energy Requirements and Efficient Design of a Grinding Circuit (Simulation of Mill Sizing and Prediction of Mill Feed Rates by DJB’s “Millpower2000” Bond Work Index-based Methodology, Matching the Mill Drive to the Mill for Effective Operating Capability to the Desired Operating Criteria, Comparison with the Results of Alternative Test Protocols).

Estimation of Operating Cost Parameters (Power and Steel Consumption)

Estimation of Preliminary Capital Cost

Use of the Mine Block Model to Optimize Mining and Processing Rates in a Mine Production Schedule

DJB Consultants Inc. specializes in working collegially with Clients’ field and mine geologists, project miners and metallurgists, and engineering specialists.

Member: Mining Suppliers Association of British Columbia

Our Comminution Consultants


Derek J Barratt

Technical Director
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Mariela Zuniga

Process Metallurgist
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