What is it about?

Residence times of the order of twenty hours in a CIL plant mean that head samples collected over an eight or twelve hour period bear very little relation to tailings samples collected over the same time period. A simple model of the mixing and delay in a CIL plant permitted the head sample truly corresponding to any tailings sample to be computed. A meaningful calculation of the recovery of gold and silver could then be made.

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Why is it important?

This technique opens the door to making a dramatic improvement to the accuracy of shift data for metal recovery in a CIL plant. The concept could be usefully applied to plants other than CIL where a significant residence time of ore in-circuit means that head and tailings do not directly correspond to each other.

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This page is a summary of: Variation in apparent recovery in CIL/CIP plants Part 1 – the effect of delay and mixing in the tanks, Mineral Processing and Extractive Metallurgy Transactions of the Institutions of Mining and Metallurgy Section C, December 2010, SAGE Publications,
DOI: 10.1179/037195510x12816242170735.
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