346 MINERALS YEARBOOK, 1941
ADA COUNTY

 Black Hornet district.—Adelmann Bros. operated their mine a short
time in 1941 and treated a little gold ore by amalgamation.
 Highland (Boise River) district.—Placer gold and silver were recovered
by sluicing in 1941 at various claims along the Boise River 12 miles east
of Boise.
 Snake River district.—There was a marked increase in output of placer
gold in the Snake River district of Ada County in 1941, owing to operation
of three dry-land dredges near Grand View, the largest production came from
ground worked by Cecil Rhodes

ADAMS COUNTY

 Seven Devils district —Lessees operated the Placer Basin mine near
Ouprum in 1941 and shipped several cars of gold öre to a smelter; nearly
all the remainder of the district output was copper ore from the Helena and
South Peacock properties.
 Snake River district —--Placer gold was recovered in 1941 by sluicing
at various claims along the Snake River near Homestead

BLAINE COUNTY

 Mineral Hill and Camas district.—The output of the Mineral Hill and
Camas district in 1941 was largely old tailings (gold) treated by cyanidation
from the Daisy property, old tailings (silver) shipped from the Minnie Moore
property, and gold ore and old tailings from the Camas property.
 Sawtooth (Vienna) district.—About 35 tons of gold-silver ore was shipped
from the Vienna mine in 1941 and a little silver ore from the Silver King
mine.
 Warm Springs district.—Except for the Coeur d'Alene region, the Warm
Springs district near Ketchum continued to be the most important producing
area in Idaho; the value ($2,667,080) of its metal output increased 14 percent
in 1941 over 1940. Zinc-lead-silver ore (about 97,000 tons) from the Triumph-North
Star-Independence groups was again the chief output of the district; the
rest of the district output was principally gold ore and old tailings from
the June Day property and gold-silver ore and lead ore from Boulder Basin
Mines.
BOISE COUNTY

 Banner district.—The only output of the Banner district in 1941 was
old mill cleanings sold to an assayer in Boise and placer gold recovered
from the Gold Fork claim.
 Boise Basin district (Centerville, Placerville, Idaho City, Pioneerville,
Q'uartzburg).—The production of ore and of each metal, especially gold
and silver, in the Boise Basin district was less in 1941 than in 1940. The
most important output was, as usual, placer gold from dredging operations,
but gold from this source decreased 13 percent from 1940. The Fisher-Baumhoff
Co., operating two bucket dredges at Centeryule, was again the largest producer
of placer gold in the State; the two dredges handled 2,529,000 cubic yards
of gravel and recovered 12,007 fine ounces of gold. The Idaho-Canadian Dredging
Co. operated its 7~-cubic foot bucket dredge at Idaho City throughout the