logical Survey, as $28,006,212, and the total production of silver as 7,622,917 fine ounces.9
Gold.—The
mine production of gold in Washington in 1919 was $252,862, against
$304,658 in 1918. Of the production in 1919 more than 98 per cent was
derived from ores shipped directly to smelters, less than 1 per cent
came from ores treated by amalgamation or cyanidation, and less than 1
per cent came from placers. Siliceous ores supplied about 98 per cent
of all gold recovered and copper ores about 1 per cent. Ferry County
alone produced $245,141 in 1919, against $276,066 in 1918. Nearly all
the yield from Ferry County was, as usual, from the Republic district.
Silver.—The
mine production of silver in Washington decreased from 310,093 ounces
in 1918 to 259,384 ounces in 1919, of which Ferry County produced
65,864 ounces, mainly from siliceous ores, and Stevens County 156,562
ounces, mainly from copper ores.
WYOMING.
The
total production of gold in Wyoming from 1867 to the end of 1919 is
given by Charles W. Henderson as $1,236,059, and the output of silver
for the same period as 69,691 ounces.
The
mine production of gold in Wyoming in 1919 was $84, against $871 in
1918, and that of silver 151 ounces, against 965 ounces in 1918. Copper
ores shipped from mines in Carbon and Platte counties contained nearly
all the gold and silver reported in 1919.
PHILIPPINE ISLANDS.
The
output of gold in the Philippine Islands from 1907 to 1919, inclusive,
has been $10,359,244. The mine production of gold for 1919 was
$1,309,722, against $1,290,000 in 1918, $1,408,161 in 1917, $1,514,200
in 1916, $1,320,900 in 1915, $1,371,514 in 1914, $868,362 in 1913, and
$570,212 in 1912.
In
1919 about $217,000 in gold was recovered by dredging. Of the
Philippine production of gold in 1919, Ambos Camarines district yielded
$217,455; Masbate district, $634,033; and Mountain Province district,
$454,672. The milling plant of the Benguet Consolidated Mining Co. in
the Province of Luzon, the largest producer of gold in the Philippine
Islands, is described in the Mining and Scientific Press of December 4
and 11, 1920.
The
mine production of silver in the Philippine Islands in 1919 was 8,409
ounces and was recovered entirely from gold bullion refined,
NUMBER OF PRODUCING MINES.
The
following table indicates the number of mines producing gold and silver
in 1919. The placers are those in which the gold and the silver in
natural alloy with the gold and, in a few placers, found also with
platinum are recovered from gravels and sands, whether by hand washing,
sluicing, hydraulicking, drifting (in frozen ground or ancient buried
river channels), or by dredging. The deep mines are those producing
gold and silver (from ores as distinguished from gravels) mainly from
underground workings, including those whose
'Idem, p. 485.
