A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting .. Ball mills normally operate with an approximate ball charge of 30%. .. powered (archaic: "treadmill"); Ship mill, floats near a river bank or bridge; Arrastra, simple mill for grinding and pulverizing (typically) gold or silver ore.
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A ball mill is a type of grinder used to grind, blend and sometimes for mixing of materials for use . The ball mill can grind various ores and other materials either wet or dry. There are two kinds .. Lixiviant · Heap leaching · Dump leaching · Tank leaching · In situ leaching · Gold chlorination · Gold cyanidation · Bayer process.