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GOLD AND SILVER.
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707
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88
per cent of the total production of gold coming from these sources
alone. The total contribution of gold derived from the great copper,
lead, and zinc mines of the country is therefore relatively small,
notwithstanding their recent enormous development and production of ore.
It
is interesting to note, however, that the placer mines and dry or
siliceous ores yielded 2 per cent less of the total gold than they did
in 1915 and 4 per cent less than in 1914 and that the output of gold
from placer mines, which had advanced from nearly 24 per cent of the
total gold in 1910 to more than 25 per cent in 1914 and had declined to
less than 23 per cent in 1915, increased to 25 per cent in 1916. This
increase in percentage was due, however, not so much to increased
output from placers as to smaller production from deep mines. The
contribution of gold from dry or siliceous ores, which had gradually
declined from about 69 per cent in 1910 to about 66 per cent in 1914
and had increased to nearly 68 per cent in 1915, decreased more than 4
per cent in 1916. The yield of gold from copper ores increased from 6
per cent in 1914 to 7 per cent in 1915 and to 9 per cent in 1916.
Mine, production of gold in 1916, in fine ounces."
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The
total value of the production of gold from placers was 122,881,663 in
1916, against $22,272,501 in 1915. The placer production increased in
Alaska, Oregon, and Colorado in 1916, but decreased in Nevada,
California, Idaho, and Montana.
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