626 MINERAL RESOURCES, 1917----PART I.
County
supplied 2,183,662 ounces. The dry or siliceous ores produced 954,477
ounces, of which Granite County supplied 394,586 ounces. Nearly all the
silver from zinc ore, 378,239 ounces, came from Silver Bow County.
NEVADA.
Gold.—The
mine production of gold in Nevada in 1917 was $6,959,468, against
$8,866,237 in 1916. The production in 1917 from mines in Esmeralda
County was $1,986,001, a decrease of nearly $700,000. The Goldfield
district yielded $1,900,082 in gold in 1917, against $2,651,158 in
1916. Nye County produced $2,007,234, of which Tonopah yielded
$1,539,529. The counties having a substantial increase in gold were
White Pine and Lincoln. Sixty-six per cent of the decrease in output of
gold was due to smaller yield from Goldfield and Tonopah.
Silver.—There
was a decrease in the mine production of silver in Nevada in 1917, the
total being 11,269,969 fine ounces, against 13,837,525 ounces in 1916.
Nye County (almost wholly from the Tonopah district) again led in
output with 7,172,642 ounces, which was about 1,700,000 ounces less
than in 1916. Churchill County, with 887,765 ounces, Humboldt County,
with 859,837 ounces, and Lincoln County, with 523,399 ounces, were the
other counties which had an output exceeding 500,000 ounces. Dry or
siliceous ores yielded all but 1,093,252 ounces of the output of silver
and 90 per cent of this yield was recovered by cyanidation.
NEW MEXICO.
Gold.—The
mine production of gold in New Mexico in 1917 was $1,064,158, against
$1,382,480 in 1916 and $1,461,105 in 1915. Mills in the Mogollon
district, Socorro County, produced $258,620; Grant County, $404,446;
and Colfax County, $348,733.
Copperores,
chiefly from Grant County, contained $224,829, and dry and siliceous
ores yielded $816,469. The output from other kinds of ore was very
small, and the placer output was only $12,179.
Silver.—The
mine production of silver in New Mexico decreased from 1,766,274 fine
ounces in 1916 to 1,394,365 ounces in 1917. Socorro County produced
859,892 fine ounces, or about 62 per cent, chiefly from siliceous ores
from the Mogollon district, the remainder from mixed ores of the
Magdalena district. The output of silver from Grant County decreased
from 549,907 fine ounces in 1916 to 487,558 ounces in 1917, and most of
this yield came from the Lordsburg district. Dry and siliceous gold and
silver ores, chiefly from Grant, Sandoval, and Socorro counties,
yielded 69.3 per cent of the total; copper ores, chiefly from Grant,
Socorro, and Santa Fe counties, yielded 23 per cent. The remainder of
the production was from lead, lead-zinc, and copper-lead ores, mainly
from the Central and Magdalena districts.
OREGON.
Gold.—The
mine production of gold from Oregon decreased more than 21 percent,
being $1,491,798 in 1917, against $1,902,179 in 1916. The output in
1916 was the largest recorded by the Survey for 13 vears. The decrease
in 1917 was mainly due to the deep mines, which yielded only $764,432,
or $265,230 less in 1917 than in 1916.
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