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Display: 50

    • Flotation cells are monitored during skimming operation for molybdenum recovery.

    • Flotation cells are monitored during skimming operation for molybdenum recovery.

    • A worker monitors a row of "Denver Sub-A" flotation machines at the Henderson Mine and mill in Empire, Clear Creek County, Colorado.

    • Molybdenum--Colorado--Empire--1980-1990.; Empire (Colo.)--1980-1990.; Henderson Mine (Clear Creek County, Colo.)--1980-1990.; Interiors--Colorado--Empire--1980-1990.; Mining--Colorado--Empire--1980-1990.

    • September 6, 1980
    • Flotation cells skim molybdenum

    • Flotation cells skim molybdenum

    • A worker monitors a row of "Denver Sub-A" flotation machines at the Henderson Mine and mill in Empire, Clear Creek County, Colorado.

    • Molybdenum--Colorado--Empire--1980-1990.; Empire (Colo.)--1980-1990.; Henderson Mine (Clear Creek County, Colo.)--1980-1990.; Interiors--Colorado--Empire--1980-1990.; Mills--Colorado--Empire--1980-1990.; Mining--Colorado--Empire--1980-1990.

    • September 6, 1980
    • The primary crusher pit begins to take shape.

    • The primary crusher pit begins to take shape.

    • Construction site of the primary crusher pit at the Henderson Mine and mill in Empire, Clear Creek County, Colorado. Shows: trucks, bulldozer, and a round foundation.

    • Empire (Colo.)--1980-1990.; Henderson Mine (Clear Creek County, Colo.)--1980-1990.; Digging--Colorado--Empire--1980-1990.; Excavation--Colorado--Empire--1980-1990.; Mining--Colorado--Empire--1980-1990.

    • September 6, 1980
    • Two regrind mills are set in place at this stage of the Henderson Mill

    • Two regrind mills are set in place at this stage of the Henderson Mill

    • Construction inside the Henderson Mine and mill, Empire, Clear Creek County, Colorado. Shows regrind mills with support structures.

    • Empire (Colo.)--1980-1990.; Henderson Mine (Clear Creek County, Colo.)--1980-1990.; Construction--Colorado--Empire--1980-1990.; Interiors--Colorado--Empire--1980-1990.; Mills--Colorado--Empire--1980-1990.; Mining--Colorado--Empire--1980-1990.

    • September 6, 1980
    • A pit is carved out to house the primary crusher at the Henderson Mill.

    • A pit is carved out to house the primary crusher at the Henderson Mill.

    • Construction site of the primary crusher pit at the Henderson Mine and mill, Empire, Clear Creek County, Colorado. Shows: cars, trucks, and a round foundation.

    • Empire (Colo.)--1980-1990.; Henderson Mine (Clear Creek County, Colo.)--1980-1990.; Excavation--Colorado--Empire--1980-1990.; Mining--Colorado--Empire--1980-1990.

    • September 6, 1980
    • The Henderson Mill, shown in early stages of construction.

    • The Henderson Mill, shown in early stages of construction.

    • Construction inside the Henderson Mine and mill in Empire, Clear Creek County, Colorado. Shows cement foundation and supports.

    • Empire (Colo.)--1980-1990.; Henderson Mine (Clear Creek County, Colo.)--1980-1990.; Construction--Colorado--Empire--1980-1990.; Interiors--Colorado--Empire--1980-1990.; Mills--Colorado--Empire--1980-1990.; Mining--Colorado--Empire--1980-1990.

    • September 6, 1980
    • Workers close covers on a bulk railroad car full of moly.

    • Workers close covers on a bulk railroad car full of moly.

    • Workers prepare a railroad car for transporting molybdenum at the Henderson Mine and mill in Empire, Clear Creek County, Colorado.

    • Molybdenum--Colorado--Empire--1980-1990.; Empire (Colo.)--1980-1990.; Henderson Mine (Clear Creek County, Colo.)--1980-1990.; Interiors--Colorado--Empire--1980-1990.; Mining--Colorado--Empire--1980-1990.; Railroad freight...

    • September 6, 1980
    • The open pit at Climax mine near Leadville, Colorado.

    • The open pit at Climax mine near Leadville, Colorado.

    • View of an open pit Molybdenum mine near Leadville, Lake County, Colorado; mining machinery includes a scoop-crane, a dump truck, a tracklayer tractor, and a truck.

    • Climax Mine (Lake County, Colo.)--1940-1970.; Leadville (Colo.)--1940-1970.; Dump trucks--Colorado--Leadville--1940-1970.; Hoisting machinery--Colorado--Leadville--1940-1970.; Mining--Colorado--Leadville--1940-1970.

    • [between 1940 and 1970?]
    • The ore tunnel at Henderson extends 9.6 miles under the Continental Divide

    • The ore tunnel at Henderson extends 9.6 miles under the Continental Divide

    • Miners stand near the headframe of a ventilation shaft of the Henderson Tunnel in Grand County, Colorado.

    • AMAX, Inc.--Branches, chapters, etc.--1970-1980.; Henderson Mine (Clear Creek County, Colo.)--Branches, chapters, etc.--1970-1980.; Grand County (Colo.)--1970-1980.; Miners--Colorado--Grand County--1970-1980.; Mining--Colorado--Grand...

    • [between 1974 and 1976]
    • Water in tailings pond is recovered to reuse in slurry pipeline

    • Water in tailings pond is recovered to reuse in slurry pipeline

    • View of the drainage system and tailings pond at the Henderson Mill in Grand County, Colorado.

    • AMAX, Inc.--Branches, chapters, etc.--1970-1980.; Henderson Mine (Clear Creek County, Colo.)--Facilities--1970-1980.; Tailings dams--Colorado--Grand County--1970-1980.; Grand County (Colo.)--1970-1980.; Mining--Colorado--Grand County--1970-1980.

    • [between 1974 and 1980]
    • Slurry pipeline carries finely ground waste rock or tailings to the tailings pond

    • Slurry pipeline carries finely ground waste rock or tailings to the tailings pond

    • View of the overhead slurry pipeline at the Henderson Mill in Grand County, Colorado. The covered conveyor is in the distance.

    • AMAX, Inc.--Branches, chapters, etc.--1970-1980.; Henderson Mine (Clear Creek County, Colo.)--Facilities--1970-1980.; Grand County (Colo.)--1970-1980.; Mining--Colorado--Grand County--1970-1980.; Pipelines--Colorado--Grand County--1970-1980.

    • [between 1974 and 1980]
    • These huge boilers at the Henderson Mine heat water for surface domestic heat

    • These huge boilers at the Henderson Mine heat water for surface domestic heat

    • A technician stands near a group of horizontal tubular boilers at the Henderson Mine in Clear Creek County, Colorado. Signs on the boilers read: "Cleaver Brooks".

    • AMAX, Inc.--Branches, chapters, etc.--1970-1980.; Clear Creek County (Colo.)--1970-1980.; Henderson Mine (Colo.)--1970-1980.; Boilers--Colorado--Clear Creek County--1970-1980.; Mining--Colorado--Clear Creek County--1970-1980.

    • [between 1976 and 1980]
    • Workers at Henderson mine prepare to go undergound

    • Workers at Henderson mine prepare to go undergound

    • Miners walk near rows of gagues enroute to the cage in the shaft of the Henderson Mine in Clear Creek County, Colorado. They wear hard hats and tool belts.

    • AMAX, Inc.--Branches, chapters, etc.--1970-1980.; Henderson Mine (Colo.)--1970-1980.; Miners--Colorado--Clear Creek County--1970-1980.; Mining--Colorado--Clear Creek County--1970-1980.

    • [between 1976 and 1980]
    • Woman miner, right, works along side male counterpart on "jumbo" drill sharing equally...

    • Woman miner, right, works along side male counterpart on "jumbo" drill sharing equally in work and pay

    • Miners, a man and a woman, work with a pneumatic drill in a tunnel of the Henderson Mine in Clear Creek County, Colorado. They wear hard hats with miners' lights.

    • AMAX, Inc.--Branches, chapters, etc.--1970-1980.; Henderson Mine (Colo.)--1970-1980.; Drilling & boring machinery--Colorado--Clear Creek County--1970-1980.; Miners--Colorado--Clear Creek County--1970-1980.; Mining--Colorado--Clear Creek...

    • [between 1976 and 1980]
    • Workers load powder into drilled holes via hose using compressed air

    • Workers load powder into drilled holes via hose using compressed air

    • Miners (a man and a woman) load explosives into the wall of a tunnel at the Henderson Mine in Clear Creek County, Colorado. They wear hard hats with miners' lights.

    • AMAX, Inc.--Branches, chapters, etc.--1970-1980.; Henderson Mine (Colo.)--1970-1980.; Explosives--Colorado--Clear Creek County--1970-1980.; Miners--Colorado--Clear Creek County--1970-1980.; Mining--Colorado--Clear Creek County--1970-1980.;...

    • [between 1976 and 1980]
    • Workers at Henderson using a "jumbo" drill advance this drift by drilling a series of...

    • Workers at Henderson using a "jumbo" drill advance this drift by drilling a series of holes

    • Miners use an LHD (load-haul-dump) and pneumatic drill in a tunnel of the Henderson Mine in Clear Creek County, Colorado. A sign on the LHD reads: "Ingersoll Rand".

    • AMAX, Inc.--Branches, chapters, etc.--1970-1980.; Henderson Mine (Colo.)--1970-1980.; Drilling & boring machinery--Colorado--Clear Creek County--1970-1980.; Miners--Colorado--Clear Creek County--1970-1980.; Mining--Colorado--Clear Creek...

    • [between 1976 and 1980]
    • ASEA locomotives, built in Sweden, power ore trains between the Henderson Mine and Mill

    • ASEA locomotives, built in Sweden, power ore trains between the Henderson Mine and Mill

    • An engineer sits in ASEA electric locomotive number 3502, it pulls ore cars on the rail line between the Henderson Mine and Mill (Grand County) Colorado.

    • ASEA (Firm)--Products--1970-1980.; Henderson Mine (Clear Creek County, Colo.)--Equipment & supplies--1970-1980.; Grand County (Colo.)--1970-1980.; Mine railroads--Colorado--Grand County--1970-1980.; Mining--Colorado--Grand County--1970-1980.;...

    • [between 1976 and 1980]
    • Urad Mill site shown at full operation

    • Urad Mill site shown at full operation

    • View of the Urad mill site, Clear Creek County, Colorado, shows mine and mill buildings and a large settling pond.

    • Tailings dams--Colorado--Clear Creek County--1960-1980.; Clear Creek County (Colo.)--1960-1980.; Mills--Colorado--Clear Creek County--1960-1980.; Mining--Colorado--Clear Creek County--1960-1980.

    • [between 1963 and 1974]
    • Reclaimed and seeded tailings offset the Urad Mill

    • Reclaimed and seeded tailings offset the Urad Mill

    • View shows the reclamation efforts, using seeded tailings, at the Urad mine, Clear Creek County, Colorado. The mill is in the distance.

    • Clear Creek County (Colo.)--1970-1980.; Mills--Colorado--Clear Creek County--1960-1980.; Mining--Colorado--Clear Creek County--1960-1980.; Reclamation of land--Colorado--Clear Creek County--1960-1980.

    • [between 1963 and 1974]
    • Dr. Larry Brown, kneeling, explains the growth processes of experimental grass seed mixture at the...

    • Dr. Larry Brown, kneeling, explains the growth processes of experimental grass seed mixture at the Urad reclamation site

    • Dr. Larry Brown demonstrates to his co-workers the growth processes of an experimental mixture of grass seed using crushed rock, wood chips, and dried sludge during the reclamation of the Urad mine site, Clear Creek County, Colorado.

    • Henderson Mine (Clear Creek County, Colo.)--People--1970-1980.; Clear Creek (Clear Creek County, Colo.)--1970-1980.; Mining--Colorado--Clear Creek County--1970-1980.; Reclamation of land--Colorado--Clear Creek County--1970-1980.; Brown, Larry.

    • [between 1975 and 1980]
    • The Urad reclamation starts to take shape

    • The Urad reclamation starts to take shape

    • View of the reclamation area, in its early stages, at the Urad mine site, Clear Creek County, Colorado. The mine, dam, and mill are in the distance.

    • Clear Creek County (Colo.)--1970-1980.; Urad Mine (Clear Creek County, Colo.)--1970-1980.; Mining--Colorado--Clear Creek County--1970-1980.; Reclamation of land--Colorado--Clear Creek County--1970-1980.

    • [between 1970 and 1980]
    • An aerial view of the restabilization of the Urad reclamation

    • An aerial view of the restabilization of the Urad reclamation

    • Two dump trucks are parked in the reclamation area at the Urad mine site, Clear Creek County, Colorado. Crushed rock from the Henderson mine was hauled here and used as tailings cover and substrate for vegetation. The mill is in the background.

    • Clear Creek County (Colo.)--1970-1980.; Urad Mine (Clear Creek County, Colo.)--1970-1980.; Mining--Colorado--Clear Creek County--1970-1980.; Reclamation of land--Colorado--Clear Creek County--1970-1980.

    • [between 1970 and 1980]
    • Crushed rock is dumped and leveled over Urad Mine tailings to provide a firm base for reclamation

    • Crushed rock is dumped and leveled over Urad Mine tailings to provide a firm base for reclamation

    • View of a bulldozer leveling the reclamation area of the Urad mine site, Clear Creek County, Colorado. The mill and tailings pond are in the background.

    • Clear Creek County (Colo.)--1970-1980.; Urad Mine (Clear Creek County, Colo.)--1970-1980.; Bulldozers--Colorado--Clear Creek County--1970-1980.; Mining--Colorado--Clear Creek County--1970-1980.; Reclamation of land--Colorado--Clear Creek...

    • [between 1970 and 1980]
    • Crushed rock is dumped and leveled over Urad Mine tailings to provide a firm base for reclamation

    • Crushed rock is dumped and leveled over Urad Mine tailings to provide a firm base for reclamation

    • A bulldozer stands by as a dump truck dumps crushed rock used for leveling the reclamation area of the Urad mine site, Clear Creek County, Colorado.

    • Clear Creek County (Colo.)--1970-1980.; Urad Mine (Clear Creek County, Colo.)--1970-1980.; Bulldozers--Colorado--Clear Creek County--1970-1980.; Dump trucks--Colorado--Clear Creek County--1970-1980.; Mining--Colorado--Clear Creek...

    • [between 1970 and 1980]
    • Headquarters for AMAX Western Operations, Golden, Colorado

    • Headquarters for AMAX Western Operations, Golden, Colorado

    • View across the landscaped parking lot of the AMAX Western Operations headquarters, Golden, Jefferson County, Colorado, shows the two- story brick building with intersecting shingle hipped roofs. Parked automobiles include: Camaro, Mercedes, Pinto,...

    • AMAX, Inc.--1980-1990.; Golden (Colo.)--1980-1990.; Mining--Colorado--Golden--1980-1990.

    • [1980]
    • Mary E. Herr

    • Mary E. Herr

    • Studio portrait of Mary Emma Herr, a senior at Denver High School in Denver, Colorado. Herr wears her hair pulled back and she leans on the back of a chair. Her dress has piping-lined lapels and a front closure, a standing lace collar and a bar pin...

    • Denver (Colo.)--1880-1890.; Students--Colorado--Denver--1880-1890.; Herr, Mary E. (Mary Emma); Denver High School--People--1880-1890.; Denver Public Schools--People--1880-1890.

    • 1880

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