In 1991 the introduction of a Netzsch laboratory stirred mill to the Mount Isa site was a turning point in finegrinding and ultrafine grinding. The ½ litre bench scale mill resembled a milk shake maker and used fine copper smelter slag as grinding media. Testwork on McArthur River ore started in 1991, and by January 1992, a small pilot scale mill, .
Manufacture to Mine
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