hydraulic mining

noun

An Americanism dating back to 1855–60

Deep mining may be divided into drifting and hydraulic mining.

Then ten miles further one is in the heart of the most extensive hydraulic mining operations of California.

They are using hydraulic mining up there, another wholesale way.

The party of spectators stood well out of the way, for the work of hydraulic mining has attached to it no little danger.

My attention was aroused to the fearful effects of hydraulic mining as we journeyed on ever upward.

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