tons of silver-bearing lead concentrates, against 33,096 fine ounces in 1910 from 35,002 tons of concentrates.
In
Illinois the silver output in 1911 was 3,036 fine ounces from 482 short
tons of silver-bearing lead concentrates (recovered from
lead-zinc-fluorspar ores), against 2,022 ounces from 398 tons of
concentrates in 1910.
In
western Kentucky silver is a by-product from lead-zinc-fluorspar ores
of the Kentucky-Illinois field, but there was no output of silver
reported for 1911, against a recovery of 84 fine ounces from 56 tons of
lead concentrates in 1910.
MONTANA.
Gold.—The
production of gold in Montana was $3,710,571 in 1911, a decrease of
$19,915 from $3,730,486 in 1910, and of $80,939 from the production of
1909. The production from placers increased; that from dry or siliceous
ores fell off; that from copper ores remained about as in 1910; and
that from lead and zinc ores decreased. By amalgamation were recovered
12,643 fine ounces of gold in Montana in 1911, by cyanidation 43,104
ounces, from placers 33,127 ounces, and the remainder, or 90,625
ounces, by smelting ores and concentrates, dry or siliceous, copper,
lead, and zinc. Madison County led in gold production, with $860,389,
of which $584,948 was from placers, operated chiefly by dredges, in the
Alder Gulch district. Broadwater County ranked second with $605,642,
mainly from auriferous pyrite ores and oxidized iron ores of the Cedar
Plains district. Chouteau County ranked third with $433,836, chiefly
from the Little Rockies.
Silver.—The silver output of Montana in 1911 was 11,985,196 fine ounces, against 12,162,857 ounces in 1910, and 12,378,714 ounces in
1909.
The copper ores alone, mainly from Butte, in Silver Bow County,
produced 9,597,752 ounces in 1911 and 9,153,590 ounces in
1910.
The dry or siliceous ores supplied 1,613,253 ounces,
chiefly from Jefferson, Granite, and Silver Bow counties; the zinc ores
supplied 491,161 ounces, all from Butte in Silver Bow County, and the
lead ores 186,926 ounces. In State output of silver Silver Bow County
led with 10,258,122 ounces in 1911, followed by Jefferson with 823,704
ounces, and Granite with 350,852 ounces. The principal silver-producing
districts in these counties are Butte, Elkhorn, and Flint Creek.
NEVADA.
Gold.—The
production of gold in Nevada in 1911 was $18,193,397, against
$18,878,864 in 1910. The largest decreases were of $850,075 from the
Goldfield district and of $234,772 from the National district; but
these were in part offset by increases from other sections, such as
that of $474,506 from Storey County (the Corns took). The great bulk of
the gold output came as usual from dry or siliceous ores and their
concentrates, the small remainder being derived almost wholly from
copper ores, placer gravels, and lead ores, in the order given. The
siliceous ores were produced mainly in Esmeralda County, where
Goldfield is the chief district; in Nye County, in which are the
Tonopah mines; in Humboldt County, which includes the new camp of
National; and in Storey County, in which is the Comstock. The
