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    • Keystone Placer Mine. Sluice boxes

    • Keystone Placer Mine. Sluice boxes

    • View of the Keystone placer mine, shows frame mine buildings and a wooden sluice, San Miguel County, Colorado.

    • Keystone Mine (San Miguel County, Colo.)--1880-1900.; San Miguel County (Colo.)--1880-1900.; Flumes--Colorado--San Miguel County--1880-1900.; Hydraulic mining--Colorado--San Miguel County--1880-1900.; Mine buildings--Colorado--San Miguel...

    • [between 1882 and 1900?]

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