Success Story - Case Study: Investigating the effects of high chrome grinding media on copper and gold flotation when treating Ridgeway high grade ore


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In 2009, we conducted laboratory tests on high-grade (Ridgeway) ore, yielding significant findings. The tests revealed that replacing forged steel with high chrome grinding media led to a shift towards more oxidizing Eh values and an increase in dissolved oxygen. There was a notable improvement in copper recovery and flotation rate kinetics. Additionally, we conducted supporting test work on the low-grade ore, confirming that high chrome media continued to be the optimal choice for this particular ore grade.


After obtaining encouraging laboratory results, a plant trial was carried out in late 2009 at the Cadia concentrators’ ball mill, using the Magotteaux mining grinding media, One Cast High Chrome.The outcome demonstrated a remarkable improvement, with copper and gold recoveries increasing by 1% and 2.1% respectively. Despite the excellent outcome, a subsequent economic decision led the mine to revert back to forged steel in 2012.

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