480 ~' n~ti~iu~s ThARB0OK~,. 1941
  METALLURGIC INDUSTRY

 Lode mines in Washington produced 1,238,509 tons of ore in 1941,
treated as follows: 1,063,076 tons in straight concentrating mills,
135,290 tons at cyanide plants, 694 tons at amalgamation plants, and
39,449 tons shipped crude to smelters.
 Amalgamation plañts.—Ten straight amalgamation plants and one
amalgamation and concentration plant treated 694 tons of dry gold ore in
1941. The Boundary Red Mountain property in Whatcom County was the chief
producer.
 Cyanidation mils.—The 400-ton cyanidation-concentration plant of Knob
Hill Mines, Inc., at Republic, Ferry County, treated the bulk of the gold
ore cyanided in 1941; the plant treated gold ore from the Knob Hill and Mountain
Lion mines. The First Thought Mine Corporation treated gold ore from the
First Thought mine in the Orient district, Stevens County, in its 50-ton
plant. These two mills treated a total of 105,218 tons of gold ore and reported
the consumption of 7,675 pounds of sodium cyanide (91-percent grade), 163,800
pounds of calcium cyanide, 29,500 pounds of zinc dust, and 1,371,800 pounds
of lime.
 Concentration mills.—A total of 1,063,076 tons of ore was treated
at 13 flotation mills, as follows: 693,937 tons of copper ore treated at
4 plants, 363,092 tons of zinc-lead ore at 4 plants, 3,747 tons of gold ore
at 4 plants, and 2,300 tons of silver ore at 1 plant.
 Details of the treatment of all ore produced in Washington in 1941 are given
in the following tables.

Mine production of metals in Washington in 1941, by methods of recovery,
in
terms of recovered metals
Method f re v r
0 CO e y
Material
treated
(short
tons)
Gold (fine
ounces)
Silver (fine
ounces)
Copper
(pounds)
 Lead (pounds)
~
Zinc
(pounds)
Ore amalpmated         
Ore cyarnded            
Concentrates smelted      
Ore smelted             
Placer                           


Total, 1940                        
694
 135,290
 71,871
 39,449


 
777
6,582
65,448
10,829
540

84, 176
82,136
 363
16,996
329,832
54,749
 90

402,030
365,175
17, 155,667
216,333


17,372,000
19,224,000
7,689,648
116,352


7,806,000
5,110,000
28,640,000
 


28,640,000
23,120,000