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  • All fields: dredges
(78 results)



Display: 50

    • 8 yard shovel Timberline Dredging operation Alma, Colo.

    • View of a steamshovel at the Timberline Dredging Company Mine near Alma (Park County), Colorado. The side of the machinery reads: "No 2" and "Page".
    • Dredges--Colorado--Alma--1940-1950.; Mining machinery--Colorado--Alma--1940-1950.; Alma (Colo.)--1940-1950.; Hydraulic mining--Colorado--Alma--1940-1950.; Mining--Colorado--Alma--1940-1950.
    • [1940]
    • Alma Gold Mining Co.

    • Alma Gold Mining Company hydraulic placer dredge, Park County, Colorado shows tailings, settling pond and backhoe with Mosquito Range in background.
    • Alma Gold Mining Company (Colo.)--1930-1940.; Dredges--Colorado--Park County--1930-1940.; Gold dredging--Colorado--Park County--1930-1940.; Park County (Colo.)--1930-1940.; Hydraulic mining--Colorado--Park County--1930-1940.; Mining--Colorado--Park...
    • February 24, 1936
    • Boiler for the first dredge that went into Warren, Idaho

    • Men pose around a wagon carrying a boiler tank in Warren, Idaho County, Idaho. They wear suits, and slouch or planter hats. A team of eight horses in harness pull the conveyance.
    • Warren (Idaho)--1880-1890.; Dredges--Idaho--Warren--1880-1890.
    • [between 1880 and 1890?]
    • Breckenridge, Colo Reliance Gold Dredge

    • View of a Reliance Gold Dredging Company Bucyrus-built hydraulic placer gold bucket-line dredge in Swan River, French Gulch, Summit County, Colorado. Colorado School of Mines students and miners pose on the vessel.
    • Reliance Gold Dredging Company--1900-1910.; Dredges--Colorado--Summit County--1900-1910.; Mining machinery--Colorado--Summit County--1900-1910.; French Gulch (Summit County, Colo.)--1900-1910.; Summit County (Colo.)--1900-1910.; Swan River...
    • 1906?
    • Construction of 14th St. viaduct, Denver, Col

    • View of 14th (Fourteenth) Street viaduct construction in Denver, Colorado; shows a hydraulic dredge, a Colorado Midland railroad flatcar, the South Platte River, and signs: "Urie Dredge Denver Grading Co."
    • Denver (Colo.)--1860-1870.; South Platte River (Colo. and Neb.)--1860-1870.; Bridge construction--Colorado--Denver--1860-1870.; Dredges--Colorado--Denver--1860-1870.; Dredging--Colorado--Denver--1860-1870.; Rivers--Colorado--Denver--1860-1870.
    • [1868?]
    • Construction scene

    • Workmen stand by horse-drawn dredges near the edge of Archer Canal in Denver, Colorado. Charles S. Lillybridge's house and studio is in the distance.
    • Lillybridge, Charles S., 1849-1935.--Homes & haunts--1900-1910.; Denver (Colo.)--1900-1910.; Dredges--Colorado--Denver--1900-1910.; Horses--Colorado--Denver--1900-1910.; Laborers--Colorado--Denver--1900-1910.; Photographic...
    • [between 1904 and 1915]
    • Cooley Bros. Dredge, Gen. view

    • View of a dragline crane, a dredge, gabled buildings and mountains on probably Beaver Creek in Park County, Colorado.
    • Park County (Colo.)--1930-1950.; Dredges--Colorado--Park County--1930-1950.; Gold dredging--Colorado--Park County--1930-1950.; Hoisting machinery--Colorado--Park County--1930-1950.; Hydraulic mining--Colorado--Park County--1930-1950.
    • [between 1935 and 1950?]
    • Cooley Bros. Dredge, Gen. view

    • View of a dragline crane, a dredge and a shovel, possibly on Beaver Creek in Park County, Colorado. The crane reads: "Cooley Brothers" and "Bucyrus Monighan."
    • Park County (Colo.)--1930-1950.; Dredges--Colorado--Park County--1930-1950.; Gold dredging--Colorado--Park County--1930-1950.; Hoisting machinery--Colorado--Park County--1930-1950.; Hydraulic mining--Colorado--Park County--1930-1950.
    • [between 1935 and 1945?]
    • Derry gold dredge by Twin Peaks

    • Workmen stand on and near the Derry Dredge, Empire Gold Dredging Company's hydraulic placer bucket-line vessel, near Leadville (Lake County), Colorado.
    • Empire Gold Dredging Company--Equipment & supplies--1910-1930.; Lake County (Colo.)--1910-1930.; Dredges--American--Colorado--Lake County--1910-1930.; Gold mining--Colorado--Lake County--1910-1930.; Hydraulic mining--Colorado--Lake...
    • [between 1915 and 1926]
    • Derry gold dredge, Box creek, Leadville

    • Hydraulic placer gold mining dredge on Box Creek, near Leadville, Lake County, Colorado, sign reads: "Derry Dredge Built by New York Ent[erprises]. Shows several men on dredge owned by Empire Gold Dredging Company.
    • Empire Gold Dredging Company--Equipment & supplies--1920-1930.; Dredges--Colorado--Lake County--1920-1930.; Gold dredging--Colorado--Lake County--1920-1930.; Box Creek (Lake County, Colo.)--1920-1930.; Lake County (Colo.)--1920-1930.; Hydraulic...
    • 1920
    • Derry Gold Dredge, near Leadville, Colo. Mt. Massive in background at right

    • Men and women pose on the Derry Dredge, Empire Gold Dredging Company's hydraulic placer bucket-line vessel, near Leadville, Lake County, Colorado. Sign reads: "Derry Dredge - Built by New York Engineering Co."
    • Empire Gold Dredging Company--Equipment & supplies--1910-1930.; Dredges--Colorado--Lake County--1910-1930.; Lake County (Colo.)--1910-1930.; Gold mining--Colorado--Lake County--1910-1930.; Hydraulic mining--Colorado--Lake County--1910-1930.; Mining...
    • between 1915 and 1926
    • Derry Gold Dredge, Twin Peaks in background, near Leadville, Colo.

    • View of the Derry Dredge, Empire Gold Dredging Company's hydraulic placer bucket-line vessel, near Leadville, Lake County, Colorado. Sign reads: "Derry Dredge - Built by New York Engineering Co."
    • Empire Gold Dredging Company--Equipment & supplies--1910-1920.; Dredges--Colorado--Lake County--1910-1930.; Lake County (Colo.)--1910-1930.; Gold mining--Colorado--Lake County--1910-1930.; Hydraulic mining--Colorado--Lake County--1910-1930.; Mining...
    • between 1915 and 1926
    • Dredge

    • Two well-dressed women and a man stand next to a hydraulic placer gold mining dredge, possibly in Clear Creek or Jefferson County, Colorado.
    • Dredges--Colorado--1870-1890.; Gold mining--Colorado--1870-1890.; Hydraulic mining--Colorado--1870-1890.; Mining--Colorado--1870-1890.
    • [between 1870 and 1890?]
    • Dredge

    • View of the Reliance Gold Dredging Company's bucket-line hydraulic placer gold mining boat, in Summit County, Colorado. Miners pose on the gantry, decks, and elevator.
    • Dredges--Colorado--Summit County--1900-1920.; Mining machinery--Colorado--Summit County--1900-1920.; Summit County (Colo.)--1900-1920.; Gold mining--Colorado--Summit County--1900-1920.; Hydraulic mining--Colorado--Summit County--1900-1920.;...
    • [between 1909 and 1913?]
    • Dredge at Hahns Peak placers

    • "Eleanor", a hydraulic placer gold mining dredge in Hahns Peak, Routt County, Colorado.
    • Dredges--Colorado--Hahns Peak--1910-1920.; Gold dredging--Colorado--Hahns Peak--1910-1920.; Hahns Peak (Colo.)--1910-1920.; Hydraulic mining--Colorado--Hahns Peak--1910-1920.; Mining--Colorado--Hahns Peak--1910-1920.
    • 1910
    • Dredge coming up the Blue

    • View of a Tonopah Placer Company bucket-line hydraulic gold dredge in the Blue River, at Breckenridge, Summit County, Colorado. "Two-Mile Bridge" is to one side; placer mine tailings are against hills, men and a parked car are in the foreground.
    • Tonopah Placer Company--1910-1920.; Dredges--Colorado--Breckenridge--1910-1920.; Mining Machinery--Colorado--Breckenridge--1910-1920.; Tailings embankments--Colorado--Breckenridge--1910-1920.; Blue River (Colo. : River)--1910-1920.; Breckenridge...
    • July 28, 1918
    • Dredger believed to be operating in vicinity of Breckenridge, Colorado

    • Panoramic view of a gold dredging operation in (probably) Breckenridge (Summit County), Colorado; a crane and conveyor belt are part of the machinery.
    • Breckenridge (Colo.)--1910-1920.; Dredges--American--Colorado--Breckenridge--1910-1920.; Gold mining--Colorado--Breckenridge--1910-1920.; Hydraulic mining--Colorado--Breckenridge--1910-1920.; Mining--Colorado--Breckenridge--1910-1920.
    • 1916?
    • Dredges in Swan River Valley capacity of 8000 yds of gold bearing gravel daily

    • Hydraulic placer gold dredge, in Summit County, Colorado; shows the gantry, tail sluices, processing sheds, and the stacker extending over mine tailing piles. Hills are in the background.
    • Dredges--Colorado--Summit County--1890-1910.; Mining machinery--Colorado--Summit County--1890-1910.; Summit County (Colo.)--1890-1910.; Gold mining--Colorado--Summit County--1890-1910.; Hydraulic mining--Colorado--Summit County--1890-1910.;...
    • [between 1890 and 1910?]
    • Dredging

    • Two well-dressed women and a man pose on the shore in front of a hydraulic placer gold mining dredge, possibly in Clear Creek or Jefferson County, Colorado.
    • Dredges--Colorado--1870-1890.; Gold mining--Colorado--1870-1890.; Hydraulic mining--Colorado--1870-1890.; Mining--Colorado--1870-1890.
    • [between 1870 and 1890?]
    • Dredging gold, Fairplay, Colo.

    • Hydraulic placer gold mining dredge, Fairplay, Park County, Colorado.
    • Dredges--Colorado--Fairplay--1900-1910.; Gold dredging--Colorado--Fairplay--1900-1910.; Fairplay (Colo.)--1900-1910.; Hydraulic mining--Colorado--Fairplay--1900-1910.; Mining--Colorado--Fairplay--1900-1910.
    • [1900?]
    • Fairplay, Colorado dredge

    • Distant view of a hydraulic placer gold mining dredge, Fairplay, Park County, Colorado with Mosquito Range in background.
    • Dredges--Colorado--Fairplay--1950-1960.; Gold dredging--Colorado--Fairplay--1950-1960.; Fairplay (Colo.)--1950-1960.; Hydraulic mining--Colorado--Fairplay--1950-1960.; Mining--Colorado--Fairplay--1950-1960.
    • September 1953
    • Fairplay, Colorado dredge

    • Distant view of a gold mining dredge and tailings, Fairplay, Park County, Colorado with Mosquito Range in background.
    • Dredges--Colorado--Fairplay--1950-1960.; Gold dredging--Colorado--Fairplay--1950-1960.; Fairplay (Colo.)--1950-1960.; Hydraulic mining--Colorado--Fairplay--1950-1960.; Mining--Colorado--Fairplay--1950-1960.
    • September 1953
    • First dredge in Idaho City

    • Miners pose on a hydraulic placer gold bucket-line dredge, in Idaho City, Boise County, Idaho; a United States flag tops the gantry, over pulleys.
    • Dredges--Idaho--Idaho City--1900-1920.; Mining machinery--Idaho--Idaho City--1900-1920.; Idaho City (Idaho)--1900-1920.; Gold mining--Idaho--Idaho City--1900-1920.; Hydraulic mining--Idaho--Idaho City--1900-1920.; Miners--Idaho--Idaho...
    • [between 1900 and 1920?]
    • Gold dredge in Summit County, Colorado

    • View of a Blue River Placer Mining Company hydraulic placer bucket-line dredge, in the Blue River, Summit County, Colorado. The gold mining vessel and processing plant has a covered stacker extending over tailing piles; mountains are in the...
    • Blue River Placer Mining Company--1920-1930.; Dredges--Colorado--Summit County--1920-1930.; Mining machinery--Colorado--Summit County--1920-1930.; Tailings embankments--Colorado--Summit County--1920-1930.; Blue River (Colo. : River)--1920-1930.;...
    • [between 1920 and 1925?]
    • Gold dredge near Fairplay, Colo.

    • View of a hydraulic placer gold dredge built by the Yuba Manufacturing Company and located in Fairplay (Park County), Colorado.
    • Fairplay (Colo.)--1940-1950.; Dredges.; Gold dredging.; Hydraulic mining.
    •  
    • Gold dredge near Golden, Colorado

    • Two well-dressed women and a man stand on the shore of a pond, west of what is now McIntyre Street, overlooking a hydraulic placer gold mining dredge southeast of North Table Mountain in Jefferson County, Colorado.
    • Dredges--Colorado--Jefferson County--1870-1890.; Jefferson County (Colo.)--1870-1890.; North Table Mountain (Colo.)--1870-1890.; Gold mining--Colorado--Jefferson County--1870-1890.; Hydraulic mining--Colorado--Jefferson County--1870-1890.;...
    • [between 1870 and 1890?]
    • Gold dredge, Breckenridge, Colo

    • View of the Blue River Placer Mining Company (or Continental Mining Company) bucket-line dredging boat, in Breckenridge, Summit County, Colorado. The covered stacker of the hydraulic mine and processing plant extends over tailing piles; a person is...
    • Dredges--Colorado--Breckenridge--1910-1940.; Mining machinery--Colorado--Breckenridge--1910-1940.; Breckenridge (Colo.)--1910-1940.; Gold mining--Colorado--Breckenridge--1910-1940.; Hydraulic mining--Colorado--Breckenridge--1910-1940.;...
    • [between 1917 and 1938?]
    • Gold dredge, Fairplay

    • Hydraulic placer gold mining dredge, Fairplay, Park County, Colorado.
    • Dredges--Colorado--Fairplay--1940-1950.; Gold dredging--Colorado--Fairplay--1940-1950.; Fairplay (Colo.)--1940-1950.; Hydraulic mining--Colorado--Fairplay--1940-1950.; Mining--Colorado--Fairplay--1940-1950.
    • 1942
    • Gold dredge, Fairplay

    • A conveyor belt moves buckets of rocks on a hydraulic placer gold mining dredge, Fairplay, Park County, Colorado.
    • Dredges--Colorado--Fairplay--1940-1950.; Gold dredging--Colorado--Fairplay--1940-1950.; Fairplay (Colo.)--1940-1950.; Conveying systems--Colorado--Fairplay--1940-1950.; Hydraulic mining--Colorado--Fairplay--1940-1950.;...
    • 1942
    • Gold dredging

    • Hydraulic placer gold mining dredge, possibly in Summit County, Colorado. Shows conveyor buckets on front of dredge used to dig gravel.
    • Dredges--Colorado--1900-1910.; Gold dredging--Colorado--1900-1910.; Conveying systems--Colorado--1900-1910.; Hydraulic mining--Colorado--1900-1910.; Mining--Colorado--1900-1910.
    • [1900?]
    • Gold mining dredge, Cripple Creek Alaska

    • Hydraulic placer gold mining dredge, known as Dredge #10. Built by the Fairbanks Exploration Company (a subsidiary of the U.S. Smelting, Refining & Mining Co.) in 1940.
    • Dredges--Alaska--Fairbanks North Star Borough--1950-1960.; Gold dredging--Alaska--Fairbanks North Star Borough--1950-1960.; Fairbanks North Star Borough (Alaska)--1950-1960.; Hydraulic mining--Alaska--Fairbanks North Star Borough--1950-1960.;...
    • June 22, 1950
    • Gold Pan pit

    • Gold Pan mine pit, Breckenridge, Summit County, Colorado shows: dredge, flume, pipe support structure, and ore conveyor.
    • Dredges--Colorado--Breckenridge--1900-1910.; Gold dredging--Colorado--Breckenridge--1900-1910.; Breckenridge (Colo.)--1900-1910.; Hydraulic mining--Colorado--Breckenridge--1900-1910.; Mining--Colorado--Breckenridge--1900-1910.
    • [1900?]
    • Gold pan pit and gold pan slopes, north end of Breckenridge

    • Gold Pan Mine, Breckenridge, Summit County, Colorado shows: mill buildings, flume, hydraulic placer mining dredge, smokestacks, and tailings.
    • Gold Pan Mine (Summit County, Colo.)--1900-1910.; Dredges--Colorado--Breckenridge--1900-1910.; Gold dredging--Colorado--Breckenridge--1900-1910.; Breckenridge (Colo.)--1900-1910.; Hydraulic mining--Colorado--Breckenridge--1900-1910.;...
    • [1900?]
    • Hydraulic dredges

    • Two hydraulic placer gold mining dredges (probably the Eleanor Dredges, east of Golden), Colorado. A solitary man poses nearby.
    • Dredges--Colorado--1900-1910.; Gold mining--Colorado--1900-1910.; Hydraulic mining--Colorado--1900-1910.; Mining--Colorado--1900-1910.
    • [1900?]
    • Junction of Gray Back Placer & Middle Creek Placer Colo.

    • View of the Grayback Mining District, Costilla County, Colorado; shows meadows, forest, and hills. A covered wagon and a man on horseback are by the creek bottom; embankments in the background have erosion from hydraulic gold dredges.
    • Costilla County (Colo.)--1900-1910.; Covered wagons--Colorado--Costilla County--1900-1910.; Horseback riding--Colorado--Costilla County--1900-1910.; Hydraulic mining--Colorado--Costilla County--1900-1910.; Mining--Colorado--Costilla...
    • [between 1900 and 1910?]
    • Mine dredge for gold

    • Hydraulic placer gold mining dredge in pond with mine tailings, Dillon, Summit County, Colorado.
    • Dredges--Colorado--Dillon--1920-1930.; Gold dredging--Colorado--Dillon--1920-1930.; Tailings embankments--Colorado--Dillon--1920-1930.; Dillon (Colo.)--1920-1930.; Hydraulic mining--Colorado--Dillon--1920-1930.; Mining--Colorado--Dillon--1920-1930.
    • July 29, 1924
    • Miners inside a gold mine pit

    • Miners use shovels and picks in a sluice and operate a crane on a hydraulic placer gold mining dredge, Park County, Colorado. Pipes run down the wall into the pit.
    • Dredges--Colorado--Park County--1900-1910.; Gold dredging--Colorado--Park County--1900-1910.; Park County (Colo.)--1900-1910.; Drilling & boring machinery--Colorado--Park County--1900-1910.; Hydraulic mining--Colorado--Park County--1900-1910.;...
    • [1900?]
    • Mining dredge

    • A man stands near the Derry Dredge, Empire Gold Dredging Company's hydraulic placer bucket-line vessel, near Leadville (Lake County), Colorado.
    • Lake County (Colo.)--1910-1930.; Dredges--American--Colorado--Lake County--1910-1930.; Gold mining--Colorado--Lake County--1910-1930.; Hydraulic mining--Colorado--Lake County--1910-1930.
    • [between 1915 and 1926]
    • No. 6 Canadian Klondike Mining Co. dredge

    • A group of men pose next to a Klondike Mining Company hydraulic placer gold dredge, Alaska.
    • Canadian Klondike Mining Company--1900-1910.; Dredges--Alaska--1900-1910.; Gold dredging--Alaska--1900-1910.; Alaska--1900-1910.; Hydraulic mining--Alaska--1900-1910.; Mining--Alaska--1900-1910.
    • November 7, 1909
    • North A. M. Gold Dredging Co

    • View of North American Gold Dredging Company placer mining operations in Summit County, Colorado; shows a hydraulic elevator and pond. Men take samples with a churn drill; lettering reads: "Keystone Driller Co."
    • Dredges--Colorado--Summit County--1890-1910.; Mining machinery--Colorado--Summit County--1890-1910.; Summit County (Colo.)--1890-1910.; Gold mining--Colorado--Summit County--1890-1910.; Hydraulic mining--Colorado--Summit County--1890-1910.;...
    • [between 1898 and 1902?]
    • Old dredge near Fairplay, Colo.

    • Abandoned hydraulic placer gold mining dredge on the frozen South Platte River near Fairplay, Park County, Colorado.
    • Abandoned mines--Colorado--Park County--1920-1930.; Dredges--Colorado--Park County--1920-1930.; Gold dredging--Colorado--Park County--1920-1930.; Park County (Colo.)--1920-1930.; South Platte River (Colo. and Neb.)--1920-1930.; Hydraulic...
    • January 1929
    • Old dredge, at mouth of Swan River

    • View of a placer dredge at Valdora, Summit County, Colorado, in the Swan River. Gold miners pose on the Bucyrus-built hydraulic mine boat and processing plant.
    • Dredges--Colorado--Valdora--1900-1910.; Mining machinery--Colorado--Valdora--1900-1910.; Valdora (Colo.)--1900-1910.; Hydraulic mining--Colorado--Valdora--1900-1910.; Miners--Colorado--Valdora--1900-1910.; Mining--Colorado--Valdora--1900-1910.
    • 1905?
    • Old gold dredge near Tiger, Colo.

    • View of an abandoned gold dredge on probably the Swan River near Tiger (Summit County), Colorado. Tailings piles are nearby.
    • Dredges--Colorado--Tiger--1940-1950.; Mining machinery--Colorado--Tiger--1940-1950.; Tiger (Colo.)--1940-1950.; Hydraulic mining--Colorado--Tiger--1940-1950.; Mining--Colorado--Tiger--1940-1950.
    • 1940
    • Placer mining near Russel [sic], La Veta Pass

    • Men in suits, one woman and workmen stand on top of, in windows and beside a Colorado Gold Dredging Company hydraulic placer gold mining dredge near Russell (Costilla County), Veta Pass (La Veta Pass), Colorado. Shows an American flag on a flagpole.
    • Russell (Colo.)--1900-1910.; Dredges--American--Colorado--Russell--1900-1910.; Gold mining--Colorado--Russell--1900-1910.; Hydraulic mining--Colorado--Russell--1900-1910.
    • [between 1900 and 1910?]
    • Placer mining near Russell, La Veta pass

    • Hydraulic placer gold mining dredge near Russell, La Veta Pass, Costilla County, Colorado.
    • Dredges--Colorado--Costilla County--1900-1910.; Gold dredging--Colorado--Costilla County--1900-1910.; Costilla County (Colo.)--1900-1910.; Veta Pass (Colo.)--1900-1910.; Hydraulic mining--Colorado--Costilla County--1900-1910.;...
    • [1900?]
    • Reiling Dredge

    • View of the French Gulch Dredging Company's Reiling Dredge, in Breckenridge, Summit County, Colorado. The Bucyrus-built hydraulic placer gold mine and processing boat has a continuous bucket-line and a covered stacker. A miner is on the gantry.
    • Dredges--Colorado--Breckenridge--1920-1930.; Mining machinery--Colorado--Breckenridge--1920-1930.; Breckenridge (Colo.)--1920-1930.; Gold mining--Colorado--Breckenridge--1920-1930.; Hydraulic mining--Colorado--Breckenridge--1920-1930.;...
    • 1920
    • Reliance Dredge, French Gulch

    • View of Revett's Reliance Gold Mining Company Bucyrus-built hydraulic bucket-line dredging boat, in Breckenridge, Summit County, Colorado. Miners pose on the decks and by the placer processing plant; snow covers mountains in the background.
    • Dredges--Colorado--Breckenridge--1900-1920.; Mining machinery--Colorado--Breckenridge--1900-1920.; Breckenridge (Colo.)--1900-1920.; French Gulch (Summit County, Colo.)--1900-1920.; Hydraulic mining--Colorado--Breckenridge--1900-1920.;...
    • [between 1905 and 1913?]
    • Scenery on North Clear Creek, showing the mines at work washing out gold.

    • Shows an open framework side-wheel hydraulic placer gold dredge; gold miners feed gravel into a sluice next to the dredge, Clear Creek County, Colorado.
    • Dredges--Colorado--Clear Creek County--1870-1880.; Gold dredging--Colorado--Clear Creek County--1870-1880.; Clear Creek County (Colo.)--1870-1880.; Hydraulic mining--Colorado--Clear Creek County--1870-1880.; Mining--Colorado--Clear Creek...
    • [between 1870-1880?]
    • So. Platte Dr. Co.

    • View of an extended arm and conveyor belt on the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado. Gravel tailing piles are on the ground at the end of the mechanical arm.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Conveying systems--Colorado--Fairplay--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]

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