hydraulic mining
noun
placer mining using a pressurized stream of water.
Also called
hy·drau·lick·ing
[hahy-draw-li-king, -drol-i-king] /haɪˈdrɔ lɪ kɪŋ, -ˈdrɒl ɪ kɪŋ/.
Origin of hydraulic mining
An Americanism dating back to 1855–60