Mine workers place wooden boards above heavy timbers of drift inside a copper mine in Ray, Arizona. Miners at work in shrinkage stope. Air drills are used to drill holes in the ceiling of the stope. A miner crushes block of ores beside an angle-braced pony sets above the drifts.
Loaded ore cars pass on haulage tracks through a copper mine drift in Ray, Arizona. The ore cars arrive at the main haulage ways leading to the ore pocket at the shaft. An ore car enters a rotary car dump.
Smoke rises from burning stopes at a copper mine in Jerome, Arizona. Copper ore is mined by the horizontal cut and fill method. Miners shovel broken ore onto chutes running through plank floor in a stope. Cribs are built above ore chutes in the floor. Waste ore is drawn through a chute car and is dumped in the open stope to fill the stope.
Mine workers arrive at a shaft in cars through a tunnel in copper mine in Jerome, Arizona. Trains of railroad cars enter the mine through a tunnel leading to the underground shaft.
A mine worker wet-drilling at a stope of a copper mine in Butte, Montana. Water is sprayed from drills onto stope walls that makes sludge of the cutting and prevents dust.
Square Set Timbering is seen inside a stope at a copper mine in Butte, Montana. Timber logs provide a support to the soft and broken rock adjoining the veins of the ore. Mine workers drill inside a stope. Timber placed in square set fashion can be seen.
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