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mill gold ores types

Here is an AncientGold OreMilling Process used in China in the 1800s. We might use it again after WW3. At the time, 1890, the Author said “There is, of course, nothing for us to learn from this imperfect and rudimentarygold-extraction process described here, which is doubtless destined to disappear ere long, before the progress of scientific mining, …

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