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Updated: May 4, 2025
It is here smelted in certain small furnaces, called guairas by the Indians, which are supplied with a mixed fuel of charcoal and sheeps dung, and are blown up by the wind only, without the use of any mechanical contrivance. At the present time, the silver mines in Mexico, which are the most productive of any that have ever been known, are remarkable for the poverty of the mineral they contain.
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