712 MINERAL RESOURCES, 1916—PART I.
represents
the disseminated type; Bingham produces from both lode and disseminated
deposits; and the remainder produce silver chiefly from copper ore
mined from deep lodes.
LEAD ORES.
The
mine production of silver from argentiferous lead ores in 1916 was
19,216,586 fine ounces, against 19,828,533 ounces in 1915. The apparent
decrease was caused by classifying as lead-zinc ores some ores that
formerly were classified as lead ores. The output from Idaho decreased
from 9,791,944 ounces in 1915 to 8,227,936 ounces in 1916, that of Utah
increased from 7,759,842 ounces to 8,118,264 ounces, and
that of Colorado from 964,224 ounces to 1,159,615 ounces. The yield in
Idaho is mainly from the silver-lead ores of the Cceur d'Alene, that in
Utah is chiefly from the Park City and Tintic districts, and that in
Colorado from Aspen and Leadville. Most of the output is from the
desilverization of lead bullion from smelting of western ores and
concentrates.
ZINC, LEAD-ZINC, AND MIXED ORES.
Argentiferous
zinc ores produced 1,274,292 ounces of silver in 1916, against
1,136,220 ounces in 1915, mainly as refinery by-products from the
smelting of zinc concentrates from Montana, Idaho, California, and
Arizona. The production from Montana zinc ores increased from 734,798
ounces in 1915 to 1,008,141 ounces in 1916.
Lead-zinc
ores produced 8,572,141 fine ounces of silver in 1916, against
6,509,092 ounces in 1915, chiefly from concentrates from the Cceur
d'Alene in Idaho, the Butte district in Montana, and the Park City
region in Utah. The output from Idaho increased from 1,586,347 ounces
in 1915 to 3,718,529 ounces in 1916.
Copper-lead
and copper-lead-zinc ores produced 533,273 ounces of siVer in 1916
against 234,047 ounces in 1915. The output was mainly from Utah,
Montana, Colorado, and Arizona.
Production of silver in the United States, by sources, as reported by mines, 1905-1916, in
fine ouncesfl
