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"Pan" of gold from "dry" panning, Pinos Altos, New Mexico, 1940

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Not all the shiny particles are gold but include mica and a few particles of quicksilver (elemental mercury). The gold usually appears in the pan as a minute shiny upper rim of the dirt in the pan. Source: Photographer Russell Lee (1903-1986), for the Office of War Information. (Courtesy of the U.S. Library of Congress, Prints and Photographs Division, Washington, D.C. Public domain.)