Exteriors of a copper mine at Butte in Montana, USA. A shift of mine workers waits in queues to enter man-cars at the surface. Miners enter the cars ready to be lowered in the mine.
View of ventilated drift inside a copper mine at Butte in Montana, USA. A canvas air pipe runs along the length of the drift. Timber blocks support the ceilings of the drift.
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.