A common indicator for excessive dilution is the usage of planning “adjustment” factors (mass and/or grade multiplier). These could typically be block model factor (typically grade), mine design factor (typically tonnes and grade), mine call factor / schedule factor (typically tonnes and grade), process factor (typically contained metal), etc.
The key to controlling dilution is through process control management e.g. identifying and mapping the various mining processes that impact on dilution, measuring each process’s performance, quantifying what the dilution is and then analysing the cause(s) and potential cost-effective solutions. The solutions may sometimes require retraining, introducing new techniques, providing incentives, and will always require management support and commitment.
The following are common underground mining aspects for excessive dilution control:
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