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GOLD AND SILVER.
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859
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Lead-zinc
ores produced 7,132,747 fine ounces of silver in 1914, against
5,334,120 ounces in 1913, chiefly from concentrates from the Coeur
d'Alene in Idaho and the Butte district in Montana. It seems probable
that the output of the Butte district will still further increase with
the continued active mining and milling of the large zinc-lead ore
bodies recently developed there. The output from both Idaho and Montana
greatly increased in 1914.
Copper-lead
and copper-lead-zinc ores produced only 248,866 ounces of silver in
1914, against 752,563 ounces in 1913. The output was mainly from
Colorado and Nevada.
DISTRIBUTION OF PRODUCTION OF GOLD AND SILVER BY METHODS OF TREATMENT.
In
the following table is given a summary of the distribution of the
production of gold and silver in the United States in 1914, showing (1)
total crude ore, tailings, and slags sold or treated; (2) crude ore
treated in gold and silver mills; (3) crude ore concentrated, with
resulting concentrates; (4) crude ore shipped to smelters; (5) old
tailings and slags treated. The last four items include recoverable
gold and silver content in fine ounces.
Distribution of production of gold and silver in 1914, by methods of treatment, by States.a
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