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iridium ore refine process

Iridium ore refine process Gold Refining Process by Aqua Regia In the aqua regia process the gold is dissolved and precipitated It is made very difficult if the silver exceeds 100 parts per 1000 and at Pretoria bullion was not treated if the silver exceeded 50 parts per 1000 Mill gold with 80 to 110 parts of silver and cyanide gold if it contained more than 50 parts

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