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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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In Sulawesi, Indonesia, miners add 1 kg Hg in each ball mill while
In China, for instance, amalgamation using miller mills leads to losses of 14 to 20 parts of Hg for one part of gold produced [15]. In Peru, miners mix Hg with ore
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Mercury in Mining a Toxic 'Time Bomb' for Indonesia - Jakarta Globe
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