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called mining dilution);
* concentrate grade is the grade of the output of the mill, limited by the chemical composition of the ore. For example, if the ore contains copper only as chalcopyrite , the attainable grade is no more than 34.6%. The ratio between the amount of commodity in the feed and in the concentrate is called recovery. For example, 90% recovery of a metal indicates that 10% were "rejected", sent by the mill into

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