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On-line Sensors in Preconcentration

In November 2020, IMA Engineering submitted a pre-recorded paper on the Future of Pre-concentration at the Digital Pre-concentration Conference in Australia. Today we would like to share that paper with the rest of you who could not attend the online event.

During years of extensive field experience and testing we have found that the waste rock dilution and ore losses create much larger economic and environmental losses than has been previously recognized. According to our studies the main reason is limited number of analysis already in exploration when drill cores or drill cuttings are used in block modelling. The same happens in production because too few and biased samples from benches are used to estimate the ore grade. Much more than today estimated amount of waste enters the mill and considerable volumes of ore losses happen at the same time. The ore grade on the benches and in muck piles is averaged and “homogenized” with averaged and biased samples. These are the main root causes of waste rock dilution and ore losses.


Download the keynote below to learn more.

The presentation shows examples of the use of on-line sensors in pre-concentration when analyzing ore and waste rock in drill cores, drill cuttings, on conveyor belt and in bulk ore sorting. Furthermore, it covers cases in ferrous and base metals and in gold mines.

Waste rock removal in preconcentration has direct effect on energy consumption in crushing and grinding and chemicals in concentrator. In concentrator waste is separated and goes to tailings pond, however, preconcentration directly reduces the volume of the tailings.

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What is IMA Engineering?

IMA Engineering has used on-line sensors for analyzing ore and waste rock in mining for more than 25 years. Today IMA on-line sensors are used in various stages of the mining process including on-line analysis of drill cores, drill chips, ore and waste in loader bucket, ROM ore analysis on belt conveyor belt and in bulk ore sorting and in slurry analysis in concentrators.

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