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Ch. 1: Gold and Silver in 1911

Ch. 1: Gold and Silver in 1911 Page of 105 Ch. 1: Gold and Silver in 1911 Text size:minus plus Restore normal size   Mail page  Print this page
250                                     MINERAL RESOURCES.
Distribution of production of gold and silver in 1911, by methods of treatment, by States.
The first item consists of all classes of ores, tailings, and slag pro­ducing gold and silver in the United States in 1911. The grand total shows that this tonnage increased from 30,287,175 short tons in 1910 to 32,928,522 short tons in 1911. This takes no account of placer gravel, but represents product of deep mines only. The largest in­crease in quantity in 1911 was in Utah, followed by considerable increases in Arizona, South Dakota, and Nevada. The quantity decreased in Colorado and Montana.
In reference to the second item, many gold and silver mills employ concentrating apparatus, and the concentrates resulting are com­bined with those from straight concentrating mills in the column of the table "Concentrates produced." The gold and silver recovery under this item is mainly by amalgamation and cyanidation, as shown in detail in the last table of this report. The total quantity of crude
Ch. 1: Gold and Silver in 1911 Page of 105 Ch. 1: Gold and Silver in 1911
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US Geol. Surv. 1911. Gemstones, Metals.
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