A mine operator or instructor stands by equipment underground at the Colorado School of Mines Experimental Mine. The Colorado School of Mines Experimental Mine is located in Idaho Springs, Clear Creek County, Colorado. ...

Equipment is shown underground at the Colorado School of Mines Experimental Mine. The Colorado School of Mines Experimental Mine is located in Idaho Springs, Clear Creek County, Colorado. Originally known as the Edgar Mine, ...

Equipment, including what looks like a ladder and a chute, are shown underground at the Colorado School of Mines Experimental Mine. The Colorado School of Mines Experimental Mine is located in Idaho Springs, Clear Creek ...

An instructor or mine operator works at a hand pump test underground, Miami drift, Colorado School of Mines Experimental Mine. Two other people stand nearby. The Colorado School of Mines Experimental Mine is located in ...

An instructor or mine operator stands on a piece of equipment underground at the Colorado School of Mines Experimental Mine. The Colorado School of Mines Experimental Mine is located in Idaho Springs, Clear Creek County, ...

A miner, probably a student, operates a winch underground at the Edgar Mine. The winch may be attached to a scraper. The Colorado School of Mines Experimental Mine is located in Idaho Springs, Clear Creek County, Colorado. ...

The Colorado School of Mines Experimental Mine is located in Idaho Springs, Clear Creek County, Colorado. Originally known as the Edgar Mine, it produced silver and gold, and some lead and copper in the 1870s. The Big Five ...

Three men are shown installing steel casing at an unidentified site.

A miner operates a timber loader in the timber yard at the Armour #1 Mine. The Armour #1 Mine, an underground iron mine near Crosby, Minnesota was operated by the Inland Steel Company.

The Armour #1 Mine, an underground iron mine near Crosby, Minnesota was operated by the Inland Steel Company.