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    • Silver bricks

    • Boston & Colorado Gold and Silver Smelting Company workers pose by stacked silver ingots in Empire Forks, Clear Creek County, Colorado; metallurgist Richard Pearce is to the left.
    • Boston & Colorado Gold and Silver Smelting Company--1870-1880.; Metallurgists--Colorado--Empire Forks--1870-1880.; Empire Forks (Colo.); Mining--Colorado--Empire Forks--1870-1880.; Silver--Colorado--Empire Forks--1870-1880.;...
    • 1875

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