Preconcentration in the pit – size matters

BoBo, La Rosa, Cameron

Presented at the Preconcentration Digital Conference November 2020

ABSTRACT

Efficient pre-concentration using natural and induced deportment starts with effective blast design. Leveraging these characteristics using Size-Based Grade Engineering® techniques requires detailed understanding and measurement of the particle size distribution (PSD) of the Run of Mine (ROM) ore. In turn, blasts must be designed to optimise fragmentation for the pre-concentration method. To be successful, fragmentation outcomes must be predicted and measured as part of the blast design process to account for the response ranking of the rock mass.

The upgrade achieved using Size-Based Grade Engineering® methodologies will rely on the proportion of feed that reports to the screen undersize, so particle size distribution of the feed stock is of paramount importance if the potential benefits are to be achieved and maintained. Measuring actual fragmentation in the ROM ore and comparing with predictions allows the modification of subsequent blast designs to optimise fragmentation for pre-concentration scenarios. Automating this process can deliver significant increases in productivity and mine site profits. This paper discusses the importance fragmentation plays in Size-Based Grade Engineering® and explores technologies and methodologies used to measure it, consistently ensuring the best outcomes

AUTHORS

T BoBo1, D La Rosa2 and P Cameron3

1. Dir. Business Development, Hexagon Mining-Split Engineering, Tucson, AZ 85701. This email address is being protected from spambots. You need JavaScript enabled to view it.

2. Principal Mining Engineer, CRC ORE, Pullenvale Qld 4069. This email address is being protected from spambots. You need JavaScript enabled to view it.

3. Business Development, Hexagon Mining-Split Engineering, Brisbane QLD 4000. This email address is being protected from spambots. You need JavaScript enabled to view it.

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