...ance, in England, and Holland is to mix such earth in situ and pump it up, mud, earth, sand, and all, — and pour it into lighters or directly upon the land adjacent. The hydraulic mining of California is by means of powerful jets of water projected against the banks of drift, the debris of former periods of glacial and fluvial action. See auger; ditching-machine; dredging-machine; scraper; well-...