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  • All fields: Monitors
(70 results)



Display: 50

    • U.S.G.P.

    • Aerial view of a U.S. Gold Placer Company hydraulic placer mine site beside the San Miguel River in Montrose County or San Miguel County, Colorado. A man poses on a hillside. Water from hydraulic monitors (nozzles) sprays over gravel in the...
    • Goodman, Charles, d. 1912.
    •  
    • Cibola gold washer

    • A man monitors a gold washing machine probably in Colorado. The machine consists of a wheel, belt, pipes and tube. A dog lays nearby.
    •  
    • [between 1920 and 1940?]
    • Placer mining on the San Miguel River

    • View of mining operations along the San Miguel River in San Miguel County, Colorado. Plumes of water emerge from pipes with hydraulic nozzles (monitors).
    • Jackson, William Henry, 1843-1942.
    • [between 1882 and 1900?]
    • Cresson ship dumping

    • Mud and rocks pour out of a chute in the interior of a mine processing building at the Cresson Mine near Cripple Creek in Teller County, Colorado. A worker in overalls and a hard hat monitors the machinery.
    • Zellers, Bob.
    • [between 1940 and 1950?]
    • Veta Mines - flotation cells

    • Interior view at the Smuggler Union Pandora (Veta Mines) in San Miguel County, Colorado; a man monitors ore processing machinery.
    • Zellers, Bob.
    • [between 1940 and 1950?]
    • Iron works

    • View of an iron works in Durango (La Plata County), Colorado. Shows rusticated stone buildings with corrugated metal roofs and monitors. One building has an arched entrance and wooden doors. A conveyor system, hoist, machinery and railroad tracks...
    • Gonner & Leeka.
    • [between 1892 and 1900?]
    • The Story of Trinity choir : 1859-1903.

    • Brief history of the Trinity Methodist Church's choir. Included are photograph of prominent performers, a list of performers by their vocal classification, a reproductions of programs for earlier performances.
    • Music Committee of Trinity Methodist Episcopal Church
    • 1902
    • Placer mining

    • Men pose near monitor nozzles probably for a U.S. Gold Placers mining operation near the San Miguel River in Montrose County or San Miguel County, Colorado. Piles of large rocks anchor the nozzles and the water pipe that supplies the monitors.
    • Goodman, Charles, d. 1912.
    • [between 1880 and 1890?]
    • Brief histories of the Denver Public Schools

    • Compiled for the administrative offices of the Denver Public Schools, this book contains brief histories for the majority of the Public Schools in Denver, Colorado up to they year 1952.
    • Denver Public Schools.
    • 1952
    • Early placer mining

    • Placer miners work near a sluice in Russell Gulch, Gilpin County, Colorado. Their tools include wheelbarrows, shovels, picks, and pitchforks. Monitors spray water, mine buildings are on the surrounding hills. David Henderson is in the foreground,...
    •  
    • [between 1860 and 1870]
    • View of Gold Run pit

    • Gold Run Mine, a gold placer mine in Summit County, Colorado; miners use hydraulic nozzles (monitors) fitted with rock counterbalances, miners with shovels stand inside the wash.
    •  
    • [between 1880 and 1890?]
    • Russell Gulch placer mining

    • Placer miners work near a sluice in Russell Gulch, Gilpin County, Colorado. Their tools include wheelbarrows, shovels, picks, and pitchforks. Monitors spray water, mine buildings are on the surrounding hills. David Henderson is in the foreground,...
    •  
    • [between 1860 and 1870]
    • Conduit #13

    • A construction worker monitors the excavation of a trench probably in Denver, Colorado. A trenching machine with a bucket attachment pulls out dirt from the side of the trench. Two large metal pipes lie in the bottom of the trench. Bungalow style...
    •  
    • 1942 November
    • Placer Mining on San Miguel River, Colo., U.S. Gold Placers, No. 26

    • Men stand beside hydraulic nozzles (monitors) fitted with rock counterbalances, or use shovels inside a wash, at a U.S. Gold Placers mining operation on the San Miguel River in San Miguel County, Colorado. Shows a water conduit and a wooden framed...
    • Goodman, Charles, d. 1912.
    •  
    • Clay "shredding" machine used to manufacture bricks

    • A man monitors production from a "shredding" machine, possibly in Denver, Colorado. The machine may serve to pulverize clay to make it suitable for the manufacture of brick. Product from the machine is loaded into adjacent rail cars.
    • Rhoads, Harry Mellon, 1880 or 81-1975.
    • [between 1900 and 1910?]
    • View of Gold Run pit

    • Gold Run Mine, a gold placer mine in Breckenridge, Summit County, Colorado; miners use hydraulic nozzles (monitors) fitted with rock counterbalances, miners with shovels stand inside the wash; shows pipes and sluice.
    •  
    • [between 1880-1890?]
    • Gold Run pit

    • Gold Run Mine, a gold placer mine near Breckenridge, Summit County, Colorado; miners operate hydraulic nozzles (monitors) fitted with rock counterbalances, miners with shovels stand inside the wash.
    •  
    • [between 1880 and 1890?]
    • U. S. Gold Placers No 18, A.

    • U. S. Gold Placers mining operation No. 18, A. near the San Miguel River, Montrose County, Colorado. Two miners use hydraulic nozzles (monitors) fitted with rock counterbalances.
    • Goodman, Charles, d. 1912.
    • December 16, 1887
    • Gold Pan Pit showing timbering

    • Miners work on timber supports near a crane at the Gold Pan Pit near Breckenridge (Summit County), Colorado. Other miners aim monitors or nozzles at the ground nearby.
    •  
    • [between 1900 and 1913]
    • Placer mining near Hahns Peak, Colo.

    • At a gold placer mine near Hahns Peak, Routt County, Colorado, miners use hydraulic nozzles (monitors) fitted with rock counterbalances and miners with shovels stand inside the wash. A man in a suit and hat watches on.
    •  
    • Spring 1948?
    • Routt county

    • Several miners work a gold placer mine near Hahns Peak, Routt County, Colorado. Four men use hydraulic nozzles (monitors), fitted with rock counterbalances. Shows men with shovels, a wheelbarrow, and on horseback. One man wears a suit and hat,...
    •  
    • [1870-1880?]

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