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Figure 1 Gold ore characterization flowsheet Brooy 1994 SAG mill semi autogenous ball SAB mill autogenous AG mill or high pressure grinding rod mill The primary stage is usually a type of crusher that reduces feed size from a magnitude of about 1m down to about 100mm Any subsequent stages have the function of reducing the 100 mm sized feed down to a magnitude of 1 mm or

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Rod mills are very similar to ball mills except they use long rods for grinding media The rods grind the ore by tumbling within the the mill similar to the grinding balls in a ball mill To prevent the conditions leading to rod charge tangling the length to diameter ratio is maintained at to

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