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Stamp millWikipedia

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gold processing: Preparation of the ore for use in various products.its transferal to Europe; however, the American mines were a greater source of silver than gold.It is invariably elemental gold and usually made up of very fine particles. .. but now the term almost universally refers to automated electronic machinery.

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A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore),Other metallurgical

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