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grinding (or milling) the ore and separating the relatively small quantities of metal from the non- metallic material of the ore in a process called. 'beneficiation.'.,copper mining and extraction sulfide ores,this the processing plant at one of chile's largest copper mines, el teniente. this is a rare chance to see a mill and flotation building before the roof is built. this stage the enriched ore now contains about 25 copper by mass and is called
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