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MINERAL RESOURCES. DISTRIBUTION OF SILVER PRODUCT IN 1908.
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The following table shows the source of silver in the United States in 1908, by kinds of ore and by States:
Source
of silver in 1908 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.a
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General statement.—-The
total silver product for 1908 was, as usual, divided chiefly between
siliceous ores, copper ores, and lead ores. The proportion from the
various ores was, however, somewhat different from 1907. Only a small
quantity was recovered from placers, most of which is credited to
Alaska and California. In percentages of the total the division was as
follows: Siliceous ores, 39.1 per cent; copper ores, 29.4 per cent;
lead ores and lead-copper ores, 29.7 per cent; zinc and zinc-lead ores,
1.5 per cent; and placers, 0.3 per cent.
Dry and siliceous ores.—The
total quantitv from this source was 19,862,038 fine ounces, against
19,038,042 "ounces in 1907. The important States ranked as follows:
Nevada, Colorado, Montana, Idaho, Arizona, California, South Dakota,
and Utah. The production of none of the remaining States reached
100,000 ounces. The increase noted above was mainly the net result of a
loss of 1,900,000 ounces in Colorado, and an increase of about
2,500,000 ounces in Nevada. Among the States of less importance in
regard to these ores Idaho, Texas, Utah, and Washington increased their
production; but this was offset by decreases in Arizona, New Mexico,
Oregon, and South Dakota. The larger part of these ores are not silver
ores proper, but ores carrying both silver and gold. The ores of
Tonopah, which now furnish most of the silver from Nevada, contain, by
value,
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