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Black Sand Mining Separator Machine Mercury Ore

During the past 50 years or more there has been a great waste of money energy and time in devising building and trying many machines to recover gold and platinum also gemstones from black sand Volumes have been written on the subject and many inquiries have been made by prospectors and others who thought that although they could not save the precious metals which most likely were

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High and New Industrial Zone, Kexue Revenue, High and New Technology Industrial Development Zone, Zhengzhou, China

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