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    Ore Grinding Mills are used for the fine grinding as the last step in the reduction of an ore prior to concentration (gravity or flotation) or cyanidation. Practice varies, depending upon the type of ore and the amount of reduction required.

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    An Arrastra (or Arastra) is a primitive mill for grinding and pulverizing (typically) gold or silver simplest form of the arrastra is two or more flatbottomed drag stones placed in a circular pit paved with flat stones, and connected to a center post by a long arm.

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