Hydraulic mining operations at Indiana Gulch, southeast of Breckenridge, Colorado. Circa 1934. Water streams down the gulch, where below men are shoveling to remove rocks and debris. The gulch bed is strewn with river rock and boulders.

Hydraulic mining operations at Indiana Gulch, southeast of Breckenridge, Colorado. Circa 1934. A forceful stream of water jets from a high pressure nozzle fitted on a hydraulic pipe (called a "Giant") and into a wide gulch strewn with log debris.