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872 MINERAL RESOURCES, 1913—PART 1.
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the
gradual increase iirplacer production from 23.76 per cent in 1910, to
24.17 per cent in 1911, to 24.94 per cent in 1912, and to 24.96 per
cent in 1913; also corresponding decreases in output from dry or
siliceous ores from 68.91 per cent in 1910 to 68.52 per cent in 1911,
to 67.29 per cent in 1912 and to 66.45 per cent in 1913. The changes
are mainly due to increased dredging output on the one hand and to
decrease in tenor of the great gold-quartz ore bodies worked on the
other.
The
following table shows the sources by classes of ore, by States, of the
gold production of 1913, and for comparison of totals by sources the
corresponding figures for 1912 are given:
Source of gold in 1913 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."
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PLACERS.
The
total value of the gold placer production was $22,238,424 in 1913,
against $23,019,633 in 1912. These figures represent 24.96 per cent of
the total domestic gold output for 1913 and 24.94 per cent of that for
1912. The placer production of Alaska was $10,680,000 in 1913, against
$11,990,000 in 1912 and $12,540,000 in 1911, and that of California was
$8,836,177 in 1913, against $8,645,663 in 1912 and $8,986,527 in 1911.
Dredging
supplied $12,226,976 in 1913 against $11,218,804 in 1912 and
$10,311,589 in 1911. Of this California produced $8,090,294 in 1913,
against $7,429,955 in 1912, and Alaska $2,200,000 in 1913 and
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