Milling Of Iron Ore

2019-10-4here is an ancient gold ore milling process used in china in the 1800se might use it again after ww3t the time, 1890, the author said there is, of course, nothing for us to learn from this imperfect and rudimentary gold-extraction process described here, which is doubtless destined to disappear ere long, before the progress of scientific mining, now making itself slowly felt.

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