LEAD-ZINC, ZINC, AND MIXED ORES.
Production
of gold from lead-zinc ores was $357,455 in 1911, against $277,541 in
1910, and was mainly from Colorado, Utah, and Arizona, in the order
named. In Colorado and Arizona there were increases and in Utah there
was a small decrease in 1911.
From
zinc ores $43,624 in gold was produced in 1911, against $61,036 in
1910, mainly from Arizona, Montana, and Colorado, in the order named.
The output from Montana alone increased in 1911.
Mixed
copper-lead and copper-lead-zinc ores yielded $23,221 in gold in 1911,
against $17,500 in 1910, the production being chiefly from Colorado and
Utah.
DISTRIBUTION OF SILVER PRODUCTION OF 1911, BY SOURCES.
The
mine production of silver from dry or siliceous ores, copper ores, and
lead ores combined in 1911 was 94.21 per cent of the total output,
against 94.06 per cent in 1910 and 92.24 per cent in 1909. The
production from dry or siliceous ores increased from 40.15 per cent of
the total in 1910 to 41.25 per cent in 1911, but the output from copper
ores decreased from 27.82 to 27.43 per cent, and that from lead ores
decreased from 26.09 to 25.53 per cent. The production from lead-zinc
ores increased. All of these changes are in the same direction as those
noted in 1910. The small output from refining placer gold remained the
same as in 1910, at 0.28 per cent of the total production, and the
small outputs from zinc and mixed ores both decreased.
The following table shows the source of silver production of the United States in 1911 by classes of ores by States:
Source
of silver in 1911 in States and Territories, as reported from the mines
to the United States Geological Survey, by kinds of ore and by States,
in fine ounces.11
