NEVADA.
Gold.—The
mine production of gold in Nevada in 1915 was $11,404,300, against
$11,481,188 in 1914. The production in 1915 from mines in Esmeralda
County was $4,689,260, a decrease of more than $537,000. The Goldfield
district yielded $4,389,385 in gold in 1915, against $4,705,210 in
1914. Nye County produced $2,956,380, of which Tonopah yielded
$2,228,983. The counties having a substantial increase in gold were
Mineral, White Pine, Humboldt, and Clark. The increased output of these
counties was almost equal to the large decreases in the production from
the Goldfield and Tonopah districts.
Silver.—There
was a decrease in the production of silver in Nevada in 1915, the total
production being 14,459,840 fine ounces, against 15,455,491 ounces in
1914. Nye County (almost wholly from the Tonopah district) again led in
output with 10,220,018 ounces, which was about 1,200,000 ounces less
than in 1914. Churchill County, with 1,620,573 ounces, and Humboldt
County, with 740,560 ounces, were the other counties which had an
output exceeding 500,000 , ounces. Dry or siliceous ores yielded all
but 650,928 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 1915 was $1,461,105, against
$1,171,696 in 1914 and $881,926 in 1913. Socorro County produced
$509,653, or 35 per cent of the State output (this was almost entirely
from siliceous ores of the Mogollon district); Grant County, $365,083,
or 25 per cent of the total; and Colfax county, $353,376, or 24 per
cent of the total.
Copper
ores, chiefly from Grant County, contained $376,662, and dry and
siliceous ores yielded $1,067,904. The output from other kinds of ore
was very small and the placer output was only $9,242.
Silver.—The
mine production of silver in New Mexico increased from 1,777,445 fine
ounces in 1914 to 2,005,531 ounces in 1915. Socorro County produced
1,358,000 fine ounces, or 68 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 increased from 304,679
fine ounces in 1914 to 508,552 ounces in 1915, and most of this yield
came from the Lords-burg district. Dry and siliceous gold and silver
ores, chiefly from Grant and Socorro counties, yielded 71 per cent of
the total; copper ores, chiefly from Grant, Socorro, and Santa Fe
counties, yielded nearly 26 per cent. The remainder of the production
was from lead and copper-lead ores, mainly from the Magdalena district.
OREGON.
Gold.—The
mine production of gold from Oregon increased 17 per cent, being
$1,861,796 in 1915, against $1,591,461 in 1914. The output in 1915 was
the largest recorded by the Survey for 12 years. The increase was due
entirely to the deep mines, which yielded $1,379,626, or $336,482 more
in 1915 that in 1914. The output
