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Gold Black Sand Roasting Grinding

2019-1-204 beat the black sand with a small hammer. 5 the black sand grains shatter. 6 any gold is released. 7 any gold is either tiny and visible only with a x40 to x100 stereo-oom microscope or is big enough to be beaten flat and rendered large enough to be seen by eye in bright light. 8 use a feather to gently scrape away the shattered black sand

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

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