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GOLD AND SILVER.
877
In
output of silver from copper ores Montana continued to lead with
10,311,809 ounces in 1913, against 10,655,055 ounces in 1912, 9,597,752
ounces in 1911 and 9,153,590 ounces in 1910; Arizona folÂlowed with
2,885,115 ounces in 1913, against 2,378,593 ounces in 1912; and Utah
ranked third with 2,314,348 ounces in 1913 against 2,542,381 ounces in
1912. California produced 833,672 ounces in 1913, against 792,445
ounces in 1912. The production of Montana is mainly from Butte, that of
Arizona from Bisbee and Jerome, that of Utah from Tintic and Bingham,
and that of California from Shasta County. Of these districts Bisbee
best represents the disseminated type; Bingham produces from both lode
and disseminated deposits; and the remainder furnish the chief supply
of silver from copper ores mined from deep lodes.
LEAD ORES.
The
silver production from argentiferous lead ores in 1913 was 18,629,246
fine ounces, against 16,632,377 ounces in 1912 and 15,596,638 ounces in
1911. The output from Idaho increased from 7,085,596 ounces in 1912 to
7,806,445 ounces in 1913, that of Utah from 6,212,219 to 7,537,361
ounces, and that of Colorado from 1,470,930 to 1,645,186 ounces. The
yield decreased in Nevada from 841,733 to 313,779 ounces, and in
Arizona from 599,110 to 498,457 ounces, but increased in Montana from
266,014 to 493,326 ounces, and in California from 35,492 to 220,229
ounces. The output in Idaho has been mainly from the silver-lead ores
of the Coeur d'Alene, that in Utah from the Park City and Tintic
districts, and that in Colorado from Aspen and Leadville. Although most
of this output is from the desilverization of lead bullion from
smelting of western sulphide lead ores and concentrates, oxidized
silver ores are still mined in small quantities at Tintic, Aspen, and a
few other camps.
ZINC, LEAD-ZINC, AND MIXED ORES.
Argentiferous
zinc ores supplied 86,432 fine ounces of silver as refinery by-products
in 1913, against 664,421 ounces in 1912 and 630,573 ounces in 1911. The
output in 1913 was almost wholly from Arizona, Colorado, Montana, and
Utah in order named.
Lead-zinc
ores furnished 5,334,120 fine ounces of silver in 1913, against
2,810,939 ounces in 1912 and 2,460,152 ounces in 1911.
MonÂtana-supplied 1,640,243 ounces in 1913, Idaho 1,632,610 ounces,
Utah 1,085,809 ounces, and Colorado 668,632 ounces. It is probable that
the production from Montana will further increase with continued active
production from the large zinc ore bodies at Butte, which carry
appreciable contents of silver and lead.
Copper-lead
and copper-lead-zinc ores in 1913 produced 752,563 fine ounces of
silver, against 654,596 ounces in 1912 and 285,006 ounces in 1911. The
production is mainly from Colorado, Utah, and Nevada.
DISTRIBUTION OF PRODUCTION OF GOLD AND SILVER, BY METHODS OF TREATMENT.
In
the Survey report on gold and silver for 1910 figures were first
published showing the distribution of output by methods of treatment.
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