40 MINERALS YE4RBOOIC

Secondary copper recovered in the United States in 1932 and imports and exports
of
scrap brass and copper, in short tons—Continued

Copper content of brass scrap (averaging about 70 percent copper):
 Newcleanscrap 32,200
 Old scrap 28, 280
 60, 480

Total copper produced from secondary sources (including copper content of
brass scrap):
 From new scrap 67, 280
 From old scrap 180, 900
  248, 180
Imports of scrap brass 1, 259
Imports of scrap copper 1, 211
Exports of scrap brass 15, 073
Exports of scrap copper 17, 179

Refined copper from secondary sources produced in the United States, 1928—32,
in pounds
 1928 1,072,800,000 1~31 694,000,000
 1929 1,253,100,000 1932 496,400,000
 1930 934,400,000


STOCKS

 The following table gives domestic stocks of copper reported by smelters
and refineries:
Stocks of copper in the United States, January 1, 1929—33, in pounds
Year
Refined copper
.
Blister, and
~
refining
Year
Refined copper
Blister and
~
refining
1929             
1930            
1931             
114,000,000
306,000,000
615,000,000
423,000,000
500,000,000
450,000,000
1932             
1933      
.
924,600,000
1,004,000,000
348, 000,000
378,000,000
IMPORTS AND EXPORTS

 United States imports and exports of copper constitute a well-balanced trade
through which the smelting, refining, and manufacturing facilities of this
country are utilized for treatment of foreign raw materials and the return
abroad of refined copper and manufactures of copper. Fifty-seven percent,
by weight, of the copper imported in 1932 was contained in ore, concentrates,
and unrefined furnace products. Much of the remainder—probably most
of it—though already refined, was ingots to be remelted and recast
in the United States. On the contrary, nearly 80 percent of the exports consisted
of refined copper and primary manufactures therefrom.
 Normally the exports of copper largely exceed the imports, but recently
this has not been the case. Exports in 1932 were only 84 percent of imports,
although in addition an unrecorded quantity of copper was exported in manufactures
partly made of copper, such as electrical machinery and other mechanisms.