Yuzhou, Ziwu County, Qingyang Prefecture, 120 miles east, Xueyin Mine.


    Snow silver is not silver, but a kind of metal. Adding a little to refined iron can make refined iron weapons more resilient and will not break easily. It is a very important strategic material.


    However, the excavation of Xueyin is very harsh, because the snow silver ore is covered by a thick layer of Qingshan stone, and every time the Qingshan stone is chiseled, it will receive a counter-shock force. A young and strong man can chisel up to a hundred times a day, otherwise he will be killed.


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