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You've searched: 3 collections

  • All fields: concentrators
(3 results)



Display: 50

    • Humprey Concentrator remains

    • View of the remains of the Humphrey Concentrator near North Clear Creek, Black Hawk, Gilpin County, Colorado.
    • Gravity concentrators--Colorado--Blackhawk--1940-1960.; North Clear Creek (Gilpin County-Jefferson County, Colo.)--1940-1960.; Blackhawk (Colo.)--1940-1960.; Mining--Colorado--Blackhawk--1940-1960.; Ruins--Colorado--Blackhawk--1940-1960.
    • [between 1940 and 1960
    • Denver business, mining machinery supplies

    • View of The Mine and Smelter Supply Company building, Denver, Colorado. It is a three story brick building with a decorative cornice and advertisements in many of the windows. They read in part: "Pipe fitting, Brass goods, Machinery supplies,...
    • Mine & Smelter Supply Company (Denver, Colo.)--1900-1920.; Denver (Colo.)--1900-1920.; Commercial facilities--Colorado--Denver--1900-1920.; Mining--Colorado--Denver--1900-1920.
    • [between 1900 and 1920]
    • Breckenridge Mill

    • Miners and mine employees stand near a concentration table in a mill near Breckenridge (Summit County), Colorado. An ore bucket hangs above the table.
    • Gravity concentrators--Colorado--Breckenridge--1880-1900.; Breckenridge (Colo.)--1880-1900.; Mills--Colorado--Breckenridge--1880-1900.; Miners--Colorado--Breckenridge--1880-1900.; Mining--Colorado--Breckenridge--1880-1900.
    • [between 1880 and 1900]

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