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Hydraulic mining - Wikipedia
By the early 1860s while hydraulic mining was at its height small-scale placer mining had largely exhausted the rich surface placers and the mining industry turned to hard rock (called quartz mining in California) or hydraulic mining which required larger organizations and much more capital. By the mid-1880s it is estimated that 11 million ounces of gold (worth approximately US$7.5.
Gold Fever Giant Gold Machines - Hydraulic Mining
Live and Let Live: Resume Hydraulic Mining. It was a battle cry in the war between the hydraulic miners and the valley farmers in the 1870s and 1880s. Massive flooding occurred in the valley orchards grain fields and even towns downstream. Grain ships couldn't navigate rivers. The farmers' pleas were ignored by the miners because mining was king in California! The farmers organized and.