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    A 193.5 mm diameter and 245.0 mm long rod mill was used for the grinding tests. The mill was equipped with six lifters, which were spaced evenly around the inside of the mill. Twenty-four, 203 mm long steel rods were used. Nine rods had a diameter of 19 mm, eight rods had a diameter of 15.9 mm, and the other eight rods had a diameter of 12.7 mm.

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