Over 70,000 men are employed in the gold-mining industry, more than two-thirds of them being engaged in quartz mining.
Gold-mining and quartz-mining are its principal industries, and in 1907 Nevada county's output of gold (104,J90.76 oz., worth $2,162,083) was second only to that of Butte county (134,813.39 oz., worth $2,786,840) in California; the county is the leading producer 1 Died the 21st of September, 1890, and Frank Bell became governor by virtue of his office as lieutenant-governor.
In East Siberia gold is obtained almost exclusively from gravel-washings, quartz mining being confined to three localities, one near Vladivostok and two in Transbaikalia.
The districts of Mariinsk and Achinsk are the most successful quartz-mining localities.
In 1885 the rudest process of "placer" washing produced an export of gold dust amounting to 120,000 pounds; quartz-mining methods were subsequently introduced, and the annual declared value of gold produced rose to about 450,000 pounds; but much is believed to have been sent out of the country clandestinely.