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during the past eight years , 3,942 samples of various ores and minerals have if wet , crushing to a uniform size in a jaw crusher , and grinding the crushed material to 1,296 fire assays have been made for gold or silver , principally for gold . are determined in ores by extracting and weighing them in the metallic state .,extract gold from copper,the different steps in extraction of copper are: crushing and concentration: the ore obtained from mines are broken down into small piece by jaw crusher and
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