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    Once the ore is broken, excavators load the ore into haul trucks and transport it to a primary ore crusher where the diamond extracting process begins. The Kimberley Big Hole is an example of openpit mining.

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    Processing Methods. ... The first stage of kimberlite processing is to crush and screen the mined ore as required in order to reduce its’ size. For alluvial type deposits crushing is rarely required and the material goes straight to screening. ... The industry perception that Rotary Pan plants yield poorer diamond recoveries is only partly ...

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    Several techniques are used to process the diamantiferous ore. The techniques used will not be the same between artisanal and industrial mining, however there are some common elements: Crushing, not too fine (rough diamond must not be crushed). Screening separates the sand from large elements. Washing disaggregates muds from ore.

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    Crushing . Since kimberlite is formed underground, it is a relatively hard rock, similar to granite. The first step to finding the ‘needle in a haystack’ diamond, is crushing the kimberlite ore. This has to be done in a controlled way in order to avoid breaking or damaging the diamonds trapped inside.

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    Conglomerate diamond ore is reduced to desirable particle sizes using heavy duty primary, secondary and tertiary crushers. The crushing and screening circuits for conglomerate are either open or closed to ensure optimised processing

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