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The primary grinding circuit consists of a 7.30m x 3.35m variable speed SAG mill in closed circuit with 500mm cyclones designed to deliver a 180 m transfer size, the secondary grinding circuit consists of a 4.7m x 7.5m ball mill in closed circuit with 250mm cyclones to provide a 45 m product to flotation.

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MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia.

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