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.
In West Siberia, however, quartz-mining is steadily increasing in importance: whereas in 1900 the output of gold from this source was less than 10,000 oz., in 1904 it amounted, to close upon 50,000 oz.
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.
This is the region of quartz mining.
Quartz-mining has since very largely taken the place of placer-mining, but the two principal gold-producing districts are still that traversed by the Blue Mountains in the northeastern quarter and that drained by the Rogue river in the southwestern corner, a continuation of the California field.
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