Hydraulic Mining CPRR Photographic History Museum
Hydraulic Mining in California. By Craig E. Crouch, Rocklin, California . Hydraulic mining uses jets of water to break down goldladen gravel banks and to wash the material through goldseparating devices (sluices and undercurrents). It was one of the dominant forms of the California gold mining industry from the mid1850s until 1884, when it was halted by federal injunction.