|
GOLD AND SILVEE.
|
241
|
||
|
|
|||
|
the
refining of lead from concentrates produced at the lead mines of
southeastern Missouri. The silver recovery is about 1 ounce per ton of
concentrates saved, and lead from only about one-sixth of the
argentiferous ores is desilverized. The output of silver from Missouri
in 1912 was 35,438 fine ounces, against 49,867 ounces in 1911, from
31,183 short tons of lead concentrates in 1912, against 51,109 tons in
1911.
In
southern Illinois the silver output in 1912 was 4,731 fine ounces from
748 short tons of silver-bearing lead concentrates (recovered from
lead-zinc-fluorspar ores), against 3,036 ounces from 482 tons in 1911.
The production is incidental to concentrating the fluorspar.
The
western Kentucky silver production is also an incidental byproduct of
lead concentrates obtained from lead-zinc-fluorspar ores, but there was
no recovery of silver content reported from this field in 1911 or 1912.
MONTANA.
Gold.—The
production of gold in Montana was $3,625,235 in 1912, against
$3,710,571 in 1911, a decrease of $85,336. _ The gold output of Montana
from deep mines has been steadily falling off for several years, but
the placer output has increased. At amalgamation and cyanidation mills
$1,039,471 was produced in 1912, and concentrates and crude ores sent
to smelters contained $666,954 and $1,109,255, respectively, in gold.
The placer production was $806,419 in 1912, of which $710,387 was from
dredging operations chiefly in the Alder Gulch district of Madison
County. This county led in gold output in Montana in 1912, chiefly from
the placer output, and was followed by Silver Bow County with gold
production mainlyfrom the Butte copper ores, and by Fergus, Blaine,
and Broadwater counties with output mainly from dry or siliceous gold
ores.
Silver.—The
silver production of Montana in 1912 was 12,731,638 fine ounces,
against 11,985,196 ounces in 1911. The copper ores alone, mainly from
the great Butte camp, produced 10,655,055 ounces in 1912; the zinc
ores, entirely from Butte, produced 402,679 ounces; and the dry or
siliceous ores, mainly from Silver Bow, Granite, and Jefferson counties
in nearly equal quantities, produced 1,318,505 ounces. The lead ores
produced 266,014 ounces, of which 103,061 ounces came from Cascade
County. In county output from all sources, Silver Bow led with
11,352,106 ounces (of the State total of 12,731,638 ounces), and
Jefferson County followed with 510,509 ounces and Granite County with
414,831 ounces. The principal .silver-producing districts outside of
Butte are Elkhorn, in Jefferson County, and Flint Creek, in Granite
County.
NEVADA.
Gold.— The
production of gold in Nevada in 1912 was $13,456,180, against
$18,193,397 in 1911. The largest decrease was of $4,047,328 from the
mines of the Goldfield district, following a decrease of $850,075 from
the same district in 1911. Another decrease was of $295,935 in Humboldt
County, from the mines of the National district, following a similar
decrease of $234,772 in 1911. These losses were but little offset by
small gains in Churchill, Lincoln, White Pine, Clark, Lander, and
Eureka counties, the largest being of $234,164 in Churchill County.
Placer and surface mines worked by hydraulic
|
|||
|
|
|||