From Mining and Scientific Press 52 (1886): 237. Arrastra demonstration in Liberty, Washington, 2007. An arrastra (or arastra) is a primitive mill for grinding and pulverizing (typically) gold or silver ore. human providing power at the other end of the arm, the stones were dragged slowly around in a circle, crushing the ore.
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The general process of mining-crushing-roasting-reducing-cupelling lead-silver ores remained the main method of silver extraction for thousands of years.
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