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    The amount and ball size distribution in this charge, as well as the frequency with which new balls are added to the mill, have significant effects on the mill capacity and the milling efficiency. Small balls are effective in grinding fine particles in the load, whereas large balls are required to deal with large particles of coal or stone contaminant.

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    The Serrote da Laje deposit owned by Aura Minerals is located in Alagoas, Brazil, which hosts five of the world''s biggest iron ore mines.. The installation license (LI) authorising the project construction was obtained in August 2009 and the definitive feasibility study was completed in September 2012.

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