GOLD, SILVER, COPPER, LEAD, AND ZINC IN CENTRAL STATES 275

Operations at the Calumet and .Hecla reclamation plants at Lake Linden and
Hubbell in 1941 and for the entire period of their operation
.
1941
----' _-----
Since
beginning
----~——----------~.
Quantity treated short tons~~Assay headings   percent- -Assay tailings  
  do~

Refined copper produced pounds-
Refined copper produced per ton treated do~ - - -
2,295,000
0.835
117
32,766,000
14.28
38,365,000
0.671
' 123
419,791,000
10.94
 The Copper Range Co. operated its Champion and Globe mines and 2,500-ton
mill at Freda throughout 1941, except for about 3 weeks following a fire
at the . mine on November 22; the company tailings-recovery plant was run
from April to December, inclusive. The Champion mine is opened by a 700 shaft
5,361 feet deep, through which the workings of both mines are reached. Copper
recovered from 304,480 tons of mine ore and 245,487 tons of sands treated
totaled 16,677,304 pounds The average yield of fine copper per ton of mme
rock was 52 38 pounds compared with 57 72 pounds in 1940 The concentrates
produced in themills were treated in the company smelter, which also handled
custom concentrates from the mills of the Isle Royale Copper Co. and the
Quincy Mining Co.
 The Isle Royale Copper Co. mine and 2,000-ton stamp mill were run continuously
in 1941, except for a shut-down of about a week in September owing to a labor
strike at. the mine. The quantity of crude ore produced decreased from 391,073
tons in 1940 to 316,598 tons in 1941, owing mainly to a reduction in the
output from No. 5 shaft; production from No. 4 shaft nearly equalled that
in 1940. Fine copper yielded per ton of rock treated averaged 21.223 pounds
in 1941 and 19.897 pounds in 1940.
 The Quincy Mining Co. operated its mine and mill steadily in 1941. The tonnage
of rock treated and the yield of copper per ton were both
 lig btlyowerthairin~194 -... ....-.........- ~. -

MISSOURI

 The total value of recoverable silver, copper, lead, and zinc produced from
Missouri mines was $22,795,293 in 1941 compared with $19,145,700 in 1940.
The silver output in 1941 (367,688 fine ounces valued at $261,467) and the
copper (2,800,000 pounds valued at $330,400) were byproducts recovered in
smelting and refining lead concentrates from Southeastern Missouri. These
two metals occur in such small quantity to the ton of concentrates that no
value is attached to them in the sale of the concentrates. The lead output
of the State came largely from the Southeastern Missouri region and the zinc
mostly from Southwestern Missouri. The Central district of Missouri produced
46 tons of recoverable lead and 207 tons of zinc in 1941; these figures are
included with those of Southeastern Mis-. souri in the table that follows.