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The SAG mill was designed to treat 2 065 t h −1 of ore at a ball charge of 8 volume total filling of 25 volume and an operating mill speed of 74 of critical. The mill is fitted with 80 mm grates with total grate open area of 7.66 m 2 ( Hart et al. 2001 ). ball mill critical speed circulating load efficiency. ball mill critical speed circulating load efficiency. Control of the mill charge behavior in dry tumbling mills The rotational mill speed was adjusted to 60 70 and 80 of the critical speed Other operating parameters of the mill such as rotational speed and ball filling poor classification.

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